Faculty Profiles - YASUDA, Keiji

Papers - YASUDA, Keiji

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Behavior of sonochemical reaction in a small pipe Reviewed

Vol. 64 ( 3 ) 2025.3

Size control of Au@Pt core-shell nanoparticles for enhanced catalytic activity using ultrafine bubbles and ultrasound Reviewed

Vol. 64 ( 3 ) 2025.3

Synthesis of Au@Pd core-shell nanoparticles by ultrafine bubbles and ultrasound without capping and reducing agents Reviewed

Vol. 53 ( 7 ) 2024.7

Dependence of reaction on vessel position, diameter, and liquid height in the sonochemical reactor with indirect irradiation Reviewed Open Access

Yasuda, K; Yamazaki, T; Asakura, Y

JAPANESE JOURNAL OF APPLIED PHYSICS Vol. 63 ( 4 ) 2024.4

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Japanese Journal of Applied Physics

To investigate the sonochemical reaction performance caused by the indirect irradiation at 500 kHz, the glass vessel and a KI aqueous solution were used. Both the ultrasonic power and reaction rate had maximum values at every half wavelength of ultrasound. When the vessel position was adjusted to a larger absolute value of transducer impedance, the reaction rate became higher. The reaction rate and ultrasonic power increased as the vessel position moved closer to the transducer. The reaction rate first increased as the electric power applied to the transducer increased, reached a maximum value, and then decreased. This decrease phenomenon is called quenching of the sonochemical reaction. Before the quenching occurrs, the reaction rate per unit volume almost linearly increased with ultrasonic power density. The effects of the vessel diameter and liquid height on the relationship between the reaction rate per unit volume and the ultrasonic power density were small.

DOI： 10.35848/1347-4065/ad2d09

Open Access

Web of Science

Scopus

Evaluation of solvent property of air-water interface based on the fluorescence spectra of 1,2′-dinaphthylamine in the aqueous solution of ultrafine bubbles Reviewed Open Access

Kodama, K; Hattori, S; Yasuda, K; Saitoh, T

ANALYTICAL SCIENCES Vol. 40 ( 2 ) page： 341 - 345 2024.2

Language：English Publishing type：Research paper (scientific journal) Publisher：Analytical Sciences

Solvent property of air–water interface was evaluated based on the fluorescence spectra of 1,2′-dinaphthylamine in water containing ultrafine bubbles (average diameter: 103 nm, standard deviation: 38 nm). Among naphthylamine derivatives whose fluorescence spectra were responsive to microscopic hydrophobicity, 1,2′-dinaphthylamine (DN) was selected because its wavelength of the maximum emission (λmax) was significantly dependent on the concentration and microenvironment of the ultrafine bubble. The λmax value of DN in water was 486 nm, while it shifted to shorter wavelength (408 nm) in the presence of 1.09 × 109 mL−1 of ultrafine bubbles. The shift of λmax value indicates that DN adsorbs on the surfaces of ultrafine bubbles and exists in hydrophobic region rather than in bulk water. By comparing with the λmax values in different solvents, the surface of ultrafine bubble was found to have similar solvent property to ethyl ether or ethyl acetate that are widely used as extracting solvents for hydrophobic organic compounds. Graphical abstract: (Figure presented.)

DOI： 10.1007/s44211-023-00454-x

Characteristics and Application of Ultrafine Bubbles Invited Reviewed

YASUDA Keiji

Vacuum and Surface Science Vol. 66 ( 11 ) page： 631 - 638 2023.11

Authorship：Lead author,　Last author,　Corresponding author Language：Japanese Publisher：The Japan Society of Vacuum and Surface Science

Ultrafine bubbles (bulk nanobubbles), small bubbles less than 1 µm in diameter, have attracted academic and industrial attention because they have numerous advantages, including chemical-free nature and extraordinarily long lifetime. Since Brownian motion velocity is much higher than buoyancy, ultrafine bubble lifetime is more than several months. But stable mechanism is still unclear, even though their inside is highly pressured. They have several characteristics, such as pH-dependent surface charge and reduction in friction. Ultrafine bubbles are generated and removed by selecting the ultrasonic frequency. This review discusses the fundamental characteristics of ultrafine bubbles and their applications. Ultrafine bubbles effectively remove proteins, dyes, and inorganic salts from solid surfaces. Ultrafine bubbles promote adsorption, desorption and extraction. Gold nanoparticles, nanocomposites of CaCO3 and pulp fiber, and follow nanoparticles are synthesized using ultrafine bubbles. Thus, ultrafine bubbles have been shown to be powerful, environmentally friendly, safe, clean, simple, and inexpensive methods.

DOI： 10.1380/vss.66.631

CiNii Research

Development of high efficiency sonochemical reactors Invited Reviewed

Yasuda Keiji, Asakura Yoshiyuki

THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN Vol. 79 ( 11 ) page： 569 - 575 2023.11

超音波霧化とウルトラファインバブルによるアミノ酸の濃縮 Invited

安田啓司

超音波TECHNO Vol. 35 ( 5 ) page： 50 - 53 2023.9

Characteristics of Ultrafine Bubbles (Bulk Nanobubbles) and Their Application to Particle-Related Technology Invited Open Access

Yasuda Keiji

KONA Powder and Particle Journal Vol. 41 ( 0 ) page： 183 - 196 2023.3

Language：English Publishing type：Research paper (scientific journal) Publisher：Hosokawa Powder Technology Foundation

Ultrafine bubbles (bulk nanobubbles), small bubbles with a diameter of less than 1 μm, have attracted academic and industrial attention because of their numerous advantages, including their chemical-free nature and extraordinarily long lifetime. The long lifetime is related to the much higher Brownian motion velocity compared to buoyancy. The reason why ultrafine bubbles can endure under stable conditions is still unclear, even though their inside is highly pressured. They have several characteristics, such as pH-dependent surface charge and reduced friction. They are also closely related to ultrasound. Ultrafine bubbles are generated and removed by selecting the ultrasonic frequency. Reaction and separation using ultrasonic cavitation and atomization, respectively, are enhanced by ultrafine bubbles. They can produce hollow nanoparticles, enhance adsorption on activated carbon, and clean solid surfaces. This review discusses the fundamental and ultrasonic characteristics of ultrafine bubbles and their application in particle-related technology, encompassing fine particle synthesis, adsorption, desorption, extraction, cleaning, and prevention of fouling.

DOI： 10.14356/kona.2024004

液中プラズマ法によるナノグラフェン合成に及ぼす超音波の影響 Invited

安田啓司, 長谷川健太, 近藤博基, 堀勝

超音波TECHNO Vol. 34 ( 5 ) page： 42 - 46 2022.10

ウルトラファインバブルのソノケミストリーへの応用 Invited

Bulletin of the Japan Society of Sonochemistry Vol. 16 ( 2 ) page： 26 - 34 2022.9

ファインバブルの特徴 Invited

安田啓司

粉体技術 Vol. 14 ( 8 ) page： 597 - 601 2022.8

Enrichment of amino acids from its aqueous solution by ultrasonic atomization and ultrafine bubbles Reviewed Open Access

Vol. 61 ( SG ) page： SG10321 - SG10325 2022.7

ウルトラファインバブルによる超音波合成した金ナノ粒子の粒子径制御 Invited

安田啓司

超音波TECHNO Vol. 34 ( 3 ) page： 83 - 87 2022.6

Study on the efficiency of a transducer for sonochemistry by calorimetry Reviewed

Y. Asakura and K. Yasuda

Japanese Journal of Applied Physics Vol. 61 page： GS1032 2022.5

Curcumin-loaded liposome preparation in ultrasound environment under pressurized carbon dioxide Reviewed Open Access

Wahyudiono, J. He, X. Hu, S. Machmudah, K. Yasuda, S. Takami, H. Kanda, M. Goto

FOODS Vol. 11 ( 10 ) page： 1469 2022.5

Generation and Reduction of Ultrafine Bubbles by Ultrasonic Irradiation Invited

YASUDA Keiji, ASAKURA Yoshiyuki

JAPANESE JOURNAL OF MULTIPHASE FLOW Vol. 36 ( 1 ) page： 12 - 19 2022.3

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：THE JAPANESE SOCIETY FOR MULTIPHASE FLOW

Ultrasound was irradiated to ultrapure water. Ultrafine bubbles with a diameter of 90 - 100 nm were generated. Number concentration of ultrafine bubbles increased with time and approached asymptotically to an equilibrium value. Ultrafine bubble concentration increased with increasing ultrasonic power and decreasing frequency. For comparison, highly concentrated ultrafine bubble water was prepared by pressurized dissolution method, and ultrasound was also irradiated to the ultrafine bubble water. Reduction of ultrafine bubbles was observed and ultrafine bubble concentration decreased to the equilibrium value. Ultrafine bubble concentration decreased with increasing ultrasonic power and frequency. Generation and reduction of ultrafine bubbles by ultrasound was modeled to analyze experimental data. The results calculated by our model were in good agreement with the experimental data.

DOI： 10.3811/jjmf.2022.t002

CiNii Research

Frequency and power dependence of ultrasonic degassing Reviewed Open Access

Asakura Y., Yasuda K.

Ultrasonics Sonochemistry Vol. 82 page： 105890 - 1058908 2022.1

Frequency and power dependence of the sonochemical reaction Reviewed Open Access

Ultrasonics Sonochemistry Vol. 81 page： 105858 - 1058587 2021.12

超音波によるウルトラファインバブルの生成・消滅と高純度な金ナノ粒子の合成 Invited

安田啓司

化学工業 Vol. 72 ( 7 ) page： 441 - 446 2021.7

超音波とウルトラファインバブルを活用した金ナノ粒子合成 Invited

安田啓司

化学工学 Vol. 85 ( 4 ) page： 232 - 235 2021.4

Sonochemical Green Technology Using Active Bubbles: Degradation of Organic Substances in Water Invited Reviewed

Yasuda Keiji

Current Opinion in Green and Sustainable Chemistry Vol. 27 page： 100411 2021.2

ウルトラファインバブルの安定性 Invited

安田啓司

化学工学 Vol. 54 ( 12 ) page： 644 2020.12

Effect of Ultrafine Bubbles on Ethanol Enrichment Using Ultrasonic Atomization Reviewed

Yasuda Keiji, Yumi Nohara, Asakura Yoshiyuki

Japanese Journal of Applied Physics Vol. 59 ( SK ) page： SKKD09 2020.7

Size-controlled Synthesis of Gold Nanoparticles by Ultrafine Bubbles and Pulsed Ultrasound Reviewed

Yasuda Keiji, Tomofumi Sato, Asakura Yoshiyuki

Chemical Engineering Science Vol. 217 page： 115527 2020.5

2P4-5 Effect of Frequency on Ultrasonic Degassing

Asakura Yoshiyuki, Yasuda Keiji

Proceedings of Symposium on Ultrasonic Electronics Vol. 40 ( 0 ) page： n/a 2019.11

Responses to the comment on the paper "Generation and reduction of bulk nanobubbles by ultrasonic irradiation"

Yasuda, K; Matsushima, H; Asakura, Y

CHEMICAL ENGINEERING SCIENCE Vol. 207 page： 1366 - 1367 2019.11

超音波霧化濃縮における液滴中のアルコール濃度 Invited

安田啓司

超音波TECHNO Vol. 67 ( 8 ) page： 350 - 353 2019.10

超音波を利用した水中の汚染物質分解と有価物質分離 Invited

安田啓司

化学と教育 Vol. 67 ( 8 ) page： 350 - 353 2019.8

Effect of Venturi Tube Shape on Reaction Performance by Hydrodynamic Cavitation

Yasuda Keiji, Ako Daisuke

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN Vol. 52 ( 3 ) page： 280 - 282 2019.3

Language：English Publishing type：Research paper (scientific journal) Publisher：The Society of Chemical Engineers, Japan

The effect of venturi tube shape on reaction rate by hydrodynamic cavitation was investigated. The apparatus mainly composed of the venturi tube, a liquid pump, a tank, a pipe arrangement, and a heat exchanger. The upstream and downstream pressures of the venturi tube were measured. The sample was an aqueous solution containing potassium iodine and chloroform. The generation rate of triiodide ion increased with increasing upstream pressure. This is because liquid velocity at the venturi tube is high and the amount of cavitation bubbles increases. When the throat diameter of the venturi tube was 2.5 mm, the generation rate of triiodide ion reached a maximum value. As the throat diameter of the venturi tube became smaller, the generation rate of triiodide ion per pass of venturi tube increased and the pass number of venturi tube decreased. Both low cavitation number and large pass number are important for high reaction performance.

DOI： 10.1252/jcej.18we183

Web of Science

Scopus

CiNii Research

Generation and Reduction of Bulk Nanobubbles by UIltrasonic Irradiation Reviewed

Yasuda Keiji, Matsushima Hodaka, Asakura Yoshiyuki

Chemical Engineering Science Vol. 195 page： 455 - 461 2019.2

ファインバブルによるオゾン反応の促進 Invited

安田啓司

エレクトロニクスコミュニケーション Vol. 34 page： 9 - 12 2019.1

A06 Size control by pulsed ultrasound and ultrafine bubbles on sonochemical synthesis of gold nanoparticles

Sato Tomofumi, Yasuda Keiji, Asakura Yoshiyuki

Proceedings of the Annual Meeting of the Japan Society of Sonochemistry Vol. 27 ( 0 ) page： 11 - 12 2018.11

Language：Japanese Publisher：Japan Society of Sonochemistry

Gold nanoparticles have electronic, magnetic and optical characteristics depending on their sizes and shapes. Ultrasonic irradiation to an aqueous solution of gold salt is able to synthesize gold nanoparticles without surfactants and reducers. Previous our study, the diameter of gold nanoparticles decreased and diameter distribution became narrow by the addition of ultrafine bubbles (UFB). In this study, we investigated effect of gas kind in UFB and pulsed ultrasound irradiation. The mean diameter of particles with Air-, Ar-, N2-, and O2-UFB are 24.7, 49.4, 73.0, and 43.1 nm, respectively. The standard deviation of particles with Air-, Ar-, N2-, and O2-UFB are 8.0, 13.5, 21.2, and 7.7 nm. This is because maximum temperature of cavitation for air is high, and many kinds of reducers (such as, nitrous acid and hydrogen peroxide) are generated since air contain Ar, N2 and O2. Compared with continuous wave, it is clear that pulse ultrasound reduces particle size.

DOI： 10.20577/pamjss.27.0_11

CiNii Research

P07 Factor that influences of sonochemical efficiency

Matsushima Hodaka, Asakura Yoshiyuki, Yasuda Keiji

Proceedings of the Annual Meeting of the Japan Society of Sonochemistry Vol. 27 ( 0 ) page： 37 - 38 2018.11

Language：Japanese Publisher：Japan Society of Sonochemistry

Intensification of sonochemical reaction is necessary to put sonochemical process into industrial
application. To evaluate the rate of sonochemical reaction, we choose sonochemical efficiency because this method has high quantitative performance, do not use hazardous chemical material, and is simple to operate. In this study, factor that influence of sonochemical efficiency is investigated. A Langevin and disc type transducers were used at 129 and 488 kHz, respectively. A circulating water bath was connected to the annular section of the vessel to maintain the sample temperature at 298 ± 1 K. Sample was aqueous solution of 0.1 M potassium iodide and volume was 100 ml. At 488 kHz, sonochemical efficiency increased with ultrasonic power until 5 W after that becomes constant. This is because sonochemical reaction fields are not enough to spread in the reactor. On the other hand, at 129 kHz, as ultrasonic power becomes higher, sonochemical efficiency increased until 1 W after that decreased. The sonochemical efficiency at 1 W is 1.5 times higher than that at 500 kHz.

DOI： 10.20577/pamjss.27.0_37

CiNii Research

P02 High-speed synthesis of nanographene with ultrasound and in-liquid plasma

Hasegawa Kenta, Nakada Ryo, Kano Hiroyuki, Kondo Hiroki, Hori Masaru, Yasuda Keiji

Proceedings of the Annual Meeting of the Japan Society of Sonochemistry Vol. 27 ( 0 ) page： 27 - 28 2018.11

Language：Japanese Publisher：Japan Society of Sonochemistry

Nanographenes are synthesized from alcohols by in-liquid plasma with ultrahigh rate. When carbon number in an alcohol molecule is high, synthesis rates increase but the crystalline nature of nanographene decreases. To eliminate trade-off between synthesis rates and crystal nature of nanographenes, ultrasound was irradiated to alcohols under in-liquid plasma. Samples were ethanol, 2-propanol, and 1-hexanol. Ultrasonic frequency was 500 kHz and power was 7.5 W. After nanographene synthesis, suspended solids were filtered using 0.45-μm-pore-size filters and treated with 30% hydrogen peroxide solution. Treated nanographene was analyzed by Raman scattering spectroscopy. Sample color was changed from transparent to black by in-liquid plasma and black area spread under ultrasound. The synthesis rate for all alcohol increased by ultrasound. In the case of 1-hexanol, crystal nature of nanographene was improved due to ultrasonic cavitation.

DOI： 10.20577/pamjss.27.0_27

CiNii Research

資源利用・環境浄化のためのファインバブルの活用 Invited

安田啓司

ファインケミカル Vol. 47 ( 10 ) page： 5-12 2018.10

ファインバブルによる廃水処理性能の向上 Invited

安田啓司

ペトロテック Vol. 41 ( 6 ) page： 432-436 2018.6

Measurement of distribution of broadband noise and sound pressures in sonochemical reactor Open Access

Yasuda, K; Nguyen, TT; Asakura, Y

ULTRASONICS SONOCHEMISTRY Vol. 43 page： 23 - 28 2018.5

Language：English Publisher：Ultrasonics Sonochemistry

Cross-sectional area distribution of broadband noise in a sonochemical reactor was measured to estimate reaction fields. A needle-type hydrophone scanned the sonochemical reactor in horizontal and vertical directions at one-millimeter interval. To show an absolute value of broadband noise, average of broadband sound pressure was defined. The distribution of sound pressures at the fundamental and second harmonic frequencies were also measured. In the case of driving frequency at 130 kHz, sonochemical reaction fields were observed in several ellipse shapes. The reaction fields in upper part of the reactor was high because cavitation bubbles moved upper part due to radiation force. The sound pressure distribution at the fundamental frequency showed existence of standing wave and reaction fields were weak at pressure antinode because cavitation bubbles were repelled by primary Bjerknes force. The sound pressure distribution at the second harmonic frequency indicated that the pattern of bubbles distribution resembled to that of reaction fields closely. In the case at 43 kHz, distributions of reaction fields and sound pressures were complex due to coupled vibration. The reaction fields were relatively weak in areas which had very high sound pressures at the fundamental frequency.

DOI： 10.1016/j.ultsonch.2017.12.051

Production of β-carotene nanoemulsions with the emulsification-evaporation technique using supercritical CO2 and improvement of its efficiency by Z-isomerization pre-treatment Reviewed

M. Ono, M. Honda, Wahyudiono, K. Yasuda, H. Kanda and M. Goto

The Journal of Supercritical Fluids Vol. 138 page： 124-131 2018.4

Measurement of Distribution of Broadband Noise and Sound Pressures in Sonochemical Reactor Reviewed

K. Yasuda, T. T. Nguyen and Y. Asakura

Ultrasonics Sonochemistry Vol. 43 page： 23-28 2017.12

ハイブリッド型超音波反応器による有害物質の分解と除去 Invited

安田啓司

超音波TECHNO Vol. 29 ( 6 ) page： 32-36 2017.12

Dependence of Cavitation, Chemical Effect, and Mechanical Effect Thresholds on Ultrasonic Frequency Reviewed Open Access

T. Nguyen, Y. Asakura, S. Koda and K. Yasuda

Ultrasonics Sonochemistry Vol. 39 page： 301 - 306 2017.11

Production of Liposome from Sphingomyelin by Ultrasonic Device under Supercritical Carbon Dioxide Reviewed

C. Uemori, T. Katsube, S. Machmudah, Wahyudiono, H. Kanda, K. Yasuda and M. Goto

Asian Journal of Applied Sciences Vol. 5 ( 5 ) page： 1042-1048 2017.10

Removal of Silicic Acid in Geothermal Water by a Combination of Ultrasonication and Silica Gel Seed

Nguyen Tam Thanh, Takahashi Yuta, Asakura Yoshiyuki, Yasuda Keiji

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN Vol. 50 ( 7 ) page： 542 - 547 2017.7

Language：English Publishing type：Research paper (scientific journal) Publisher：The Society of Chemical Engineers, Japan

A combination of ultrasonication and silica gel seed was studied as a silica scale prevention method in geothermal water. The effects of ultrasonic frequency, initial monosilicic acid concentration, pH, concentration, particle diameter and pore size of the silica gel on the removal ratio of silicic acid were examined. For comparison, stirring without and with silica gel, and ultrasonication with the addition of hydrogen peroxide or t-butanol were performed. Ultrasonication enhances the removal of silicic acid by silica gel seed. Ultrasonication at 500 kHz was more effective for the removal of silicic acid than ultrasonication at 28 kHz and stirring. The removal ratio of silicic acid increased with an increase in silica gel concentration. The small seed particle diameter of 60 µm and large seed pore size of 7 nm performed well in the removal of silicic acid. When the initial concentration of monosilicic acid was 1.1 g/L and the silica gel concentration was 1.5 g/L, the removal ratio of silicic acid was highest at pH 6 because the reaction between polymer and polymer is dominant. However, in the case of an initial monosilicic acid concentration of 0.5 g/L, the removal ratio was highest at pH 9 because reaction between polymer and monomer is dominant. The polymerization rate of monosilicic acid was increased by the addition of hydrogen peroxide due to a higher formation rate of hydroxide radicals. In contrast, the addition of t-butanol lowered the polymerization rate of monosilicic acid because the hydroxide radicals were scavenged. The frequency switching from 500 kHz to 28 kHz at 90 min for each ultrasonication enhanced the removal ratio of silicic acid.

DOI： 10.1252/jcej.16we262

Web of Science

Scopus

CiNii Research

Effect of Ultrasonic Cavitation on Measurement of Sound Pressure Using Hydrophone Reviewed

T. T. Nguyen, Y. Asakura, N. Okada, S. Koda and K. Yasuda

T. T. Nguyen, Y. Takahashi, Y. Asakura, N. Okada, S. Koda, K. Yasuda Vol. 56 ( 7 ) page： 07JE061-07JE065 2017.7

A05 Development of sonochemical reactor using ultrafine bubble

Matsushima Hodaka, Asakura Yoshiyuki, Yasuda Keiji

Proceedings of the Annual Meeting of the Japan Society of Sonochemistry Vol. 26 ( 0 ) page： 11 - 12 2017

Language：Japanese Publisher：Japan Society of Sonochemistry

Development of sonochemical reactor with high efficiency is necessary to put sonochemical process into practical use. With the intention to supply nuclei of cavitation bubble and increase cavitation amount, ultrafine bubble (UFB) whose diameter was lower than 1 μm was generated in the reactor. The reactor consisted of two vessels. One vessel contained a 488 kHz transducer to generate sonochemical reaction. Another vessel contained a 22 kHz transducer and boiling stone to generate UFB. Two vessels were connected by liquid pump and tubes. Sample was 0.1 M KI aqueous solution which was prepared using ultrapure water or high-density UFB water. High-density UFB water was produced by pressurized dissolution method. I3- production amount for high-density UFB water was higher than that for ultrapure water. However, UFB number in high-density UFB water rapidly reduced by ultrasound at 488 kHz. Many UFB generated by ultrasound at 22 kHz and boiling stone in ultrapure water. Ultrafine bubble sonoreactor with 488 kHz, 22 kHz and boiling stone showed additional increase in I3- production amount.

DOI： 10.20577/pamjss.26.0_11

CiNii Research

P17 Effect of ultrasound condition on generation and reduction of ultrafine bubble

Asakura Yoshiyuki, Matsushima Hodaka, Yasuda Keiji

Proceedings of the Annual Meeting of the Japan Society of Sonochemistry Vol. 26 ( 0 ) page： 53 - 54 2017

Language：Japanese Publisher：Japan Society of Sonochemistry

Bubbles of less than 1 μm in diameter are called ultrafine bubbles (UFB). When ultrasound
was irradiated to ultrapure water in a vessel, the change of number density of UFB with irradiation time was
investigated in ultrasonic frequency at 22, 43, 129, 488 kHz and 1 MHz. The number density of UFB
exponentially increased with irradiation time. The number density of UFB increased with decreasing
frequency. The mean and mode diameters of UFB after ultrasonic irradiation for 5 minutes to ultrapure water
were 100 - 120 nm and 90 - 100 nm, respectively. Furthermore, when ultrasound was irradiated to water
containing high-concentration UFB, the change of number density of UFB with irradiation time was
investigated. The number density of UFB decreased exponentially with irradiation time. The number density
of UFB decreased with increasing frequency. Therefore, it was clear that generation and reduction of UFB
occurred simultaneously by ultrasonic irradiation to water.

DOI： 10.20577/pamjss.26.0_53

CiNii Research

P05 Synthesis of gold nanoparticles using ultrasound and ultrafine bubbles

Sato Tomofumi, Yasuda Keiji, Asakura Yoshiyuki

Proceedings of the Annual Meeting of the Japan Society of Sonochemistry Vol. 26 ( 0 ) page： 29 - 30 2017

Language：Japanese Publisher：Japan Society of Sonochemistry

Gold nanoparticles possess the size- and shape-dependent catalytic and optical properties. Synthesis by ultrasonic cavitation needs no surfactant and reductive agents. Ultrafine bubble (UFB) which is smaller than 1 μm in diameter has high charge on the surface and long residence time. In this study, we investigated how UFB effect the synthesis of gold nanoparticles by ultrasound. Sample was 0.1 mM HAuCl4 solution. Ultrasonic frequency and temperature were 500 kHz and 283 K, respectively. By addition of UFB, nucleus generation time was shorten, diameter of gold nanoparticles decreased and diameter distribution of spherical particles became narrow. As the UFB density became higher, dimeter of gold nanoparticles became smaller. It is thought that UFB enhances cavitation generation and UFB attached on nanoparticles prevents aggregation of nanoparticles. As the UFB density increased, fraction of plate particles decreases. This is because formation rate of plate particles is slower than that of sphere particles.

DOI： 10.20577/pamjss.26.0_29

CiNii Research

超音波反応器の開発とソノプロセスの応用 Invited

安田啓司

Vol. 23 ( 383 ) page： 236-242 2016.7

Simulation of the Formation and Characteristics of Ultrasonic Fountain Reviewed

Z. Xu, K. Yasuda, X-J. Liu

Ultrasonics Sonochemistry Vol. 32 page： 241-246 2016.3

ファインバブルの資源・環境分野への活用 Invited

安田啓司

混相流 Vol. 30 ( 1 ) page： 37-44 2016.3

Quantitative Calculation of Reaction Performance in Sonochemical Reactor by Bubble Dynamics Reviewed

Z. Xu, K. Yasuda and X-J. Liu

Chinese Physics B Vol. 24 ( 10 ) page： 1043011-1043017 2015.8

Dispersion and Coalescence of Oil Droplets by Ultrasound and Application for Solvent Extraction of Gallium Reviewed

K. Yasuda, T. T. Nguyen, R. Okura, S. Nakayama, J. Jin and Y. Asakura

Japanese Journal of Applied Physics Vol. 54 ( 7S1 ) page： 07HE031-07HE035 2015.5

Separation of Oil Droplets from Oil-in-water Emulsion Using a Microbubble Generator Reviewed

K. Yasuda and K. Haneda

Journal of Chemical Engineering of Japan Vol. 48 ( 3 ) page： 175-180 2015.3

Characteristics of Ultrasonic Atomization and Alcohol Separation Invited

Bulletin of the Japan Society of Sonochemistry Vol. 9 ( 1 ) page： 17-22 2015.3

Methane Hydrate Formation by Using Finebubbles and Tetrahydrofuran Invited

Keiji Yasuda

J. Jpn. Inst. Energy Vol. 93 ( 11 ) page： 1031-1037 2014.11

Influence of Orifice Shape on Reaction Rate by Hydrodynamic Cavitation Reviewed

K. Yasuda, T. Kaji and Z. Xu

Applied Mechanics and Materials Vol. 625 page： 718-721 2014.8

Separation Characteristics of Alcohol from Aqueous Solution by Ultrasonic Atomization Reviewed

K. Yasuda, M. Mochida, Y. Asakura and S. Koda

Ultrasonics Sonochemistry Vol. 21 ( 6 ) page： 2026-2031 2014.7

地熱水中ケイ酸重合に及ぼす超音波の影響

安田啓司, 高橋優太

超音波TECHNO Vol. 26 ( 4 ) page： 46-49 2014.7

Effect of Ultrasonic Irradiation on Behavior of Silica Polymerization in Geothermal Water Reviewed

K. Yasuda, Y. Takahashi and Y. Asakura

Japanese Journal of Applied Physics Vol. 53 ( 7S ) page： 07KE081-07KE083 2014.6

Effect of Superposition Location of Ultrasonic Fields on Sonochemical Reaction Rate Reviewed

K. Yasuda and K. Matsuura

Japanese Journal of Applied Physics Vol. 52 ( 7R ) page： 0780011-0780013 2013.6

Numerical Simulation of Liquid Velocity Distribution in a Sonochemical Reactor Reviewed

Z. Xu, K. Yasuda and S. Koda

Ultrasonics Sonochemistry Vol. 20 ( 1 ) page： 452-459 2013.1

ソノケミストリーを応用した水質汚染物質の処理 Invited

安田啓司

熱測定 Vol. 40 ( 2 ) page： 58-64 2013

ソノケミカル反応速度に及ぼす超音波場重ね合わせの影響 Invited

安田啓司

超音波TECHNO Vol. 25 ( 6 ) page： 85-88 2013

Effect of Pore Size on Performance of Hydrogen Fermentation with Porous Glass Beads Reviewed

K. Yasuda, Y. Kishima, M. Sakka and K. Sakka

Journal of Chemical Engineering of Japan Vol. 45 ( 9 ) page： 785-788 2012.9

Characteristics of Nanoemulsion Prepared by Tandem Acoustic Emulsification at a High Frequency Reviewed

K. Yasuda, S. Nakayama and Y. Asakura

Journal of Chemical Engineering of Japan Vol. 45 ( 9 ) page： 734-736 2012.9

Wastewater Treatment for Bioethanol Production System by Using Ozone Microbubbles Reviewed

K. Yasuda and N. Ban

Journal of Chemical Engineering of Japan Vol. 45 ( 9 ) page： 672-677 2012.9

Effect of Operational Conditions on 1,4-Dioxane Degradation by Combination of Ultrasound and Ozone Microbubbles Reviewed

Z. Xu, K. Mochida, T. Naito and K. Yasuda

Japanese Journal of Applied Physics Vol. 51 ( 07 ) page： 07GD081-07GD086 2012.7

超音波を利用した物質分解と反応器の開発

安田啓司

超音波TECHNO Vol. 24 ( 5-6 ) page： 14-18 2012.5

ソノケミストリー　いま、ナノ微粒化が面白い Invited

安田啓司, 香田　忍

化学 Vol. 66 ( 6 ) page： 47-50 2011.6

Ultrasonic Atomization Amount for Different Frequencies Reviewed

K. Yasuda, H. Honma, Z. Xu, Y. Asakura and S. Koda

Japanese Journal of Applied Physics Vol. 50 ( 7S ) page： 07HE231-07HE235 2011

Enhancement of Sonochemical Reaction by Dual-pulse Ultrasound Reviewed

Z. Xu and K. Yasuda

Japanese Journal of Applied Physics Vol. 50 ( 7S ) page： 07HE071-07HE075 2011

超音波霧化量の定量化

安田啓司

超音波TECHNO Vol. 23 ( 6 ) page： 90-93 2011

超音波霧化の原理と分離特性

安田啓司

エアロゾル研究 Vol. 26 ( 1 ) page： 5-10 2011

超音波化学反応性能に及ぼす攪拌機の影響 Invited

安田啓司

超音波TECHNO Vol. 22 ( 2 ) page： 44-46 2010.3

マイクロバブル発生器を用いたオゾン溶存挙動に及ぼす操作条件の影響 Invited

安田啓司, 羽根田晃一, 坂東芳行, 前田正吾, 川瀬泰人

化学工学シンポジウムシリーズ Vol. 81 page： 7-12 2010

Effect of Ultrasonic Frequency on Enzymatic Hydrolysis of Cellulose Reviewed

K. Yasuda, D. Kato, Z. Xu, M. Sakka and K. Sakka

Japanese Journal of Applied Physics Vol. 49 ( 9 ) page： 07HE081-07HE082 2010

Development of Airlift Bubble Column Dispersed with Micro-bubbles Reviewed

K. Yasuda, Y. Wang, K. Haneda, T. Naito, Y. Bando, T. Takeyama and Y. Kawase

Canadian Journal of Chemical Engineering Vol. 88 ( 4 ) page： 518-522 2010

ソノケミストリーの環境浄化への応用―水環境の改善・修復― Invited

安田啓司, 香田　忍

日本音響学会誌 Vol. 66 ( 7 ) page： 325-330 2010

マイクロバブルを応用した最近の技術 Invited

安田啓司, 坂東芳行

分離技術 Vol. 40 ( 3 ) page： 146 2010

Optimization of Sonochemical Reactors by Measuring Impedance of Transducer and Sound Pressure in Solution Reviewed

Y. Asakura, S. Fukutomi, K. Yasuda and S. Koda

Journal of Chemical Engineering of Japan Vol. 43 ( 12 ) page： 1008-1013 2010

炭化繊維を固定化担体とした高度排水処理用の矩形気泡塔の開発 Reviewed

安田啓司, 吉松　崇, 加藤和美, 山本周治, 小林孝行, 坂東芳行

化学工学論文集 Vol. 35 ( 1 ) page： 36-41 2009

超音波照射によるセルロースの酵素糖化促進 Invited

安田啓司

セルロース学会 Vol. 16 ( 1 ) page： 16-20 2009

マイクロバブルを気泡塔に分散させた際の流動特性および分解性能 Invited

安田啓司, 坂東芳行

混相流 Vol. 23 ( 1 ) page： 12-20 2009

Authorship：Lead author Language：Japanese

マイクロバブル発生器を備えた気泡塔における流動特性および分解性能について検討した。その結果、マイクロバブルの物質移動容量係数はミリバブルよりもかなり高い。容量係数はマイクロバブルの分散する領域の割合に強く依存する。物質移動係数はマイクロバブルの方がミリバブルよりもかなり低い。水中の有機物のオゾン分解速度はマイクロバブルの方が高い。分解速度定数は物質移動容量係数に依存する。ことを明らかにした。

オゾンマイクロバブルによる汚泥の減容化 Invited

安田啓司, 吉松　崇, 深谷健也, 坂東芳行

分離技術 Vol. 33 ( 2 ) page： 74-78 2009

下水処理場の余剰汚泥からのリン回収 Invited

安田啓司

分離技術 Vol. 33 ( 2 ) page： 66-67 2009

超音波による化学物質の分解と反応器の開発 Invited

安田啓司

The Chemical Times Vol. 212 page： 2-7 2009

Effect of Agitation Condition on Performance of Sonochemical Reaction Reviewed

K. Yasuda, K. Matsuura, Y. Asakura and S. Koda

Japanese Journal of Applied Physics Vol. 48 ( 7 ) page： 07GH041-07GH043 2009

Flow Characteristics in Cocurrent Upflow Bubble Column Dispersed with Micro-Bubbles Reviewed

Y. Bando, T. Yoshimatsu, W. Luo, Y. Wang, K. Yasuda, M. Nakamura, Y. Funato and M. Oshima

Journal of Chemical Engineering of Japan Vol. 41 ( 7 ) page： 562-567 2008.7

Development of a Large Sonochemical Reactor at a High Frequency Reviewed

Y. Asakura, K. Yasuda, D. Kato, Y. Kojima and S. Koda

Chemical Engineering Journal Vol. 139 ( 2 ) page： 339-343 2008

超音波を利用する物質分解 Invited

安田啓司

化学工学会誌 Vol. 72 ( 11 ) page： 625-627 2008

余剰汚泥のオゾン分解に及ぼすマイクロバブルの影響 Reviewed

坂東芳行, 吉松　崇, 王　宇飛, 安田啓司, 杉江　享, 浅井健好

日本混相流学会誌，混相流研究の進展 Vol. 3 page： 51-57 2008

Enhancement of Sonochemical Reaction Rates of Terephthalate by Superposition of Ultrasonic Fields of Various Frequencies Reviewed

K. Yasuda, T. Torii, K. Yasui, Y. Iida, T. Tuziuti, M. Nakamura and Y. Asakura

Ultrasonics Sonochemistry Vol. 14 ( 6 ) page： 699-704 2007

Effect of Reflection Plate on Decomposition Performance of Sonoreactor Reviewed

J. Zhou, K. Yasuda, Y. Bando and Y. Kawase

Journal of Chemical Engineering of Japan Vol. 40 ( 12 ) page： 1085-1087 2007

汚染土壌中のVOCの洗浄・無害化ソノプロセス Invited

安田啓司, 小島義弘, 飯田康夫, 佐野教信, 朝倉義幸, 香田　忍

超音波TECHNO Vol. 19 ( 6 ) page： 83-87 2007

Effect of Liquid Height on Sonochemical Reaction in a Large-scale Reactor of a Rectangular Parallelepiped Using Low Frequency Ultrasound Reviewed

Y. Asakura, K. Ishio, Y. Kojima, D. Kato, S. Fukutomi, K. Yasuda and S. Koda

Journal of Chemical Engineering of Japan Vol. 40 ( 12 ) page： 1088-1092 2007

地下水・土壌中の有機塩素化合物の分解 Invited

安田啓司, 小島義弘

ファインケミカル Vol. 36 ( 3 ) page： 45-51 2007

大型の超音波反応器の開発 Invited

安田啓司, 小島義弘, 香田　忍, 朝倉義幸

化学工業 Vol. 58 ( 8 ) page： 49-55 2007

Dynamics of Ultrasonically Induced Birefringence of in Rod-like Colloidal Solutions Reviewed

T. Matsuoka, K. Yasuda, K. Yamamoto, S. Koda and H. Nomura

Colloids and Surfaces B Vol. 56 ( 1-2 ) page： 72-79 2006

Development of Small Ultrasonic Reactor for On-site Treatment of Wastewater Including Chlorinated Hydrocarbon Reviewed

Y. Kawase, T. Masuya, K. Yasuda and M. Nakamura

Journalof Chemical Engineering of Japan Vol. 39 ( 1 ) page： 95-98 2006

Effect of Flow Mode of Carrier Gas on Performance of Ultrasonic Atomization Reviewed

Y. Kawase, T. Masuya, K. Yasuda and M. Nakamura

Journalof Chemical Engineering of Japan Vol. 39 ( 8 ) page： 842-845 2006

超音波霧化とオゾン照射を組み合わせた分解装置の開発 Reviewed

川瀬泰人, 増家孝佳, 安田啓司, 中村正秋

化学工学論文集 Vol. 32 ( 4 ) page： 369-371 2006

Hydrogen Fermentation by Using Heat-Shocked Granular Sludge Reviewed

A. Sano, K. Yasuda, Y. Bando and M. Nakamaura

Journalof Chemical Engineering of Japan Vol. 39 ( 5 ) page： 580-582 2006

超音波による多孔性物質からの有機塩素化合物の除去 Reviewed

川瀬泰人, 安田啓司, 中村正秋

日本混相流学会誌, 混相流研究の進展Ⅰ page： 295-300 2006

Effects of Operation Conditions on Performance of Concentrator Using Ultrasonic Atomization Reviewed

Y. Kawase, T. Masuya, K. Yasuda and M. Nakamura

Journalof Chemical Engineering of Japan Vol. 39 ( 3 ) page： 334-339 2006

Effect of Ultrasonic Irradiation on Solvent Cleaning for Parts Impregnated with Chlorinated Organic Compounds Reviewed

Y. Kawase, A. Takeuchi, K. Yasuda, Y. Bando and M. Nakamura

Journalof Chemical Engineering of Japan Vol. 39 ( 1 ) page： 99-101 2006

Analysis of Concentration Characteristics in Ultrasonic Atomization by Droplet Diameter Distribution Reviewed

K. Yasuda, Y. Bando, S. Yamaguchi, M. Nakamura, A. Oda and Y. Kawase

Ultrasonics Sonochemistry Vol. 12 ( 1-2 ) page： 37-41 2005

Enhancement in Biodegradability of Excess Sludge by Using a Centrifugal Reviewed

A. Sano, Y. Bando, K. Yasuda, M. Nakamura, A. Senga and E. Kiyokawa

Journalof Chemical Engineering of Japan Vol. 38 ( 6 ) page： 446-449 2005

超音波霧化による分離 Invited

安田啓司, 坂東芳行, 中村正秋, 川瀬泰人

化学工業 Vol. 56 ( 2 ) page： 34-38 2005

超音波を用いた木材からの有機塩素化合物の除去

安田啓司, 竹内　旭, 中村正秋, 朝倉義幸

マテリアルインテグレーション Vol. 3 ( 18 ) page： 37-41 2005

超音波照射による木材からの有機塩素化合物の除去性能 Invited

安田啓司, 竹内　旭, 中村正秋, 朝倉義幸

超音波TECHNO Vol. 17 ( 3 ) page： 86-90 2005

Effects of Particle Properties on Decomposition Performance in Ultrasonic Airlift Reactor Reviewed

K. Yasuda, Y. Osuka, Y.Bando and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 37 ( 2 ) page： 294-298 2004

The Effects of the Solute Properties in Aqueous Solutions on the Separation Characteristics in Ultrasonic Atomization Reviewed

K. Yasuda, Y. Bando, S. Yamaguchi, M. Nakamura, E. Fujimori, A. Oda and Y. Kawase

Journal of Chemical Engineering of Japan Vol. 37 ( 10 ) page： 1290-1292 2004

Effect of Dual Frequency on Sonochemical Reaction Rates Reviewed

T. Suzuki, K. Yasui, K. Yasuda, Y. Iida, T. Tuziuti, T. Torii and M. Nakamura

Research on Chemical Intermediates Vol. 30 ( 7-8 ) page： 703-711 2004

超音波照射による伝熱面へのスケール析出防止 Reviewed

安田啓司, 森　英利, 水上裕人, 土井一慶, 坂東芳行, 中村正秋, 小田昭昌, 川瀬泰人

化学工学論文集 Vol. 30 ( 4 ) page： 549-551 2004

Effect of Packed Structure on the Liquid Flow Behavior in the Packed Bed Biofilter Reviewed

Y. Bando, T. Suzuki, Y. Toyoda, K. Yasuda and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 37 ( 2 ) page： 370-373 2004

Generation and Consumption Rates of OH Radicals in Sonochemical Reactions Reviewed

T. Torii, K. Yasui, K. Yasuda, Y. Iida, T. Tuziuti, T. Suzuki and M. Nakamura

Research on Chemical Intermediates Vol. 30 ( 7-8 ) page： 713-721 2004

The Effect of Operational Condition on the Contribution of Evaporation in Ultrasonic Atomization Reviewed

Y. Bando, S. Yamaguchi, K. Doi, M. Nakamura, K. Yasuda, A. Oda and Y. Kawase

Journal of Chemical Engineering of Japan Vol. 37 ( 10 ) page： 1286-1289 2004

Development of a Rectangular Airlift Sonoreactor Combined with Sparging Ozone Reviewed

Y. Bando, S. Yamaguchi, Y. Toyoda, K. Doi, M. Nakamura, K. Yasuda, A. Oda and Y. Kawase

Journal of Chemical Engineering of Japan Vol. 37 ( 8 ) page： 1070-1074 2004

Development of a Bubble Column with a Gas-Liquid Simultaneous Injection Nozzle and a Downcomer for the Ozone Oxidation Method Reviewed

Y. Bando, T. Sasagawa, K. Doi, K. Yasuda and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 37 ( 8 ) page： 1062-1069 2004

Effect of Carrier Gas Condition on Concentration of Alcohol Aqueous Solution by Ultrasonic Atomization Reviewed

K. Yasuda, N. Tanaka, L. Rong, M. Nakamura, L. Li, A. Oda and Y. Kawase

Japanese Journal of Applied Physics Vol. 42 ( 5B ) page： 2956-2957 2003

Decomposition of p-Chlorophenol in Aqueous Solution by Combination of Ultrasound and Ultraviolet Light Reviewed

L. Rong, K. Yasuda, M. Nakamura, N. Kato, K. Kawasaki and Y. Kitaide

Journal of Chemical Engineering of Japan Vol. 36 ( 9 ) page： 1045-1049 2003

Effect of Liquid Height on Flow Characteristics in Bubble Column Using Highly Viscous Liquid Reviewed

Y. Bando, M. Chaya, S. Hamano, K. Yasuda, M. Nakamura, K. Osada and M. Matsui

Journal of Chemical Engineering of Japan Vol. 36 ( 5 ) page： 523-529 2003

超音波による水溶液中のフェノールとクロロフェノールの分解 Invited

栄　雷, 安田啓司, 中村正秋

超音波TECHNO Vol. 15 ( 1 ) page： 72-75 2003

超音波霧化によるアルコールの分離 Invited

安田啓司, 山口素代子, 田中直史, 中村正秋, 川瀬泰人, 李　基良, 李　莉

超音波TECHNO Vol. 15 ( 5 ) page： 76-79 2003

Ultrasonic Decomposition of a Mixture of Phenol and p-Chlorophenol in Aqueous Solution Reviewed

L. Rong, K. Yasuda, Y. Bando and M. Nakamura

Japanese Journal of Applied Physics Vol. 41 ( 5B ) page： 3272-3276 2002

Reduction of Channeling Liquid Flow in Trickle Bed Using Non-Uniformly Packed Structure Reviewed

M. Li, Y. Bando, T. Tsuge, K. Yasuda and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 35 ( 7 ) page： 687-691 2002

排水処理に適した超音波反応器の開発 Invited

安田啓司, 中村正秋

超音波TECHNO Vol. 14 ( 6 ) page： 72-75 2002

シリカゲルシードへのケイ酸の析出速度に及ぼすpHおよび温度の影響 Reviewed

杉田　創, 松永　烈, 山口　勉, 坂東芳行, 櫻井幸夫, 安田啓司, 中村正秋

日本地熱学会誌 Vol. 23 ( 1 ) page： 1-10 2001

気泡塔の流動特性に及ぼす油分分散の影響 Reviewed

坂東芳行, 茶谷　真, 安田啓司, 桜井幸夫, 中村正秋, 川瀬信行

化学工学論文集 Vol. 27 ( 4 ) page： 477-479 2001

Effect of Fluidzing Particle on Drying Characteristics of Porous Material in Fludized Bed Reviewed

Y. Tatemoto, Y. Bando, K. Yasuda, Y. Senda and M. Nakamura

Drying Technology Vol. 19 ( 7 ) page： 1305-1318 2001

Effects of Operational Conditions on Drying Characteristics in Closed Superheated Drying Reviewed

Y. Tatemoto, Y. Bando, K. Oyama, K. Ysuda, M. Nakamura, Y. Sugimura and M. Shibata

Drying Technology Vol. 19 ( 7 ) page： 1287-1303 2001

Analysis of Liquid Distribution in Non-uniformly Packed Trickle Bed with Single Phase Flow Reviewed

M. Li, Y. Bando, T. Tsuge, K. Yasuda and M. Nakamura

Chemical Engineering Science Vol. 56 ( 21-22 ) page： 5969-5976 2001

Effect of Packed Structure on Flow Behavior in a Trickle Bed Biofilter Reviewed

M. Li, Y. Bando, R. Tanigawara, T. Kamiya, K. Yasuda and M. Nakamura

Canadian Journal of Chemical Engineering Vol. 79 ( 4 ) page： 602-607 2001

Effect of Packed Structure and Liquid Physical Properties on Liquid Flow Behavios in Trickle Bed with Non-uniformly Packed Structure Reviewed

M. Li, Y. Bando, R. Tanigawara, T. Tsuge, K. Yasuda and M. Nakamura

Journalof Chemical Engineering of Japan Vol. 34 ( 7 ) page： 948-955 2001

排水中の難分離性物質処理に適したエアリフト式超音波反応器の開発 Reviewed

安田啓司, 大鋸正慶, 城美砂子, 栄　雷, 坂東芳行, 中村正秋

化学工学論文集 Vol. 27 ( 4 ) page： 449-453 2001

Measurements of Changes in Mass of Silica Deposited on Metal Surface from Geothermal Brine with Time by Quartz Crystal Microbalance Reviewed

Vol. 26 ( 1 ) page： 116-118 2000

シリカゲル流動化粒子を用いた過飽和ケイ酸の除去実験について Reviewed

杉田　創, 坂東芳行, 安田啓司, 中村正秋, 山口　勉, 松永　烈

日本地熱学会誌 Vol. 22 ( 1 ) page： 1-8 2000

固液旋回流動層の流動および伝熱特性 Invited

坂東芳行, 田中良和, 安田啓司, 中村正秋

ケミカルエンジニアリング Vol. 45 ( 10 ) page： 759-763 2000

Development of Bubble Column for Foam Separation Reviewed

Y. Bando, T. Kuze, T. Sugimoto, K. Yasuda and M. Nakamura

Korean Journal of Chemical Engineering Vol. 17 ( 5 ) page： 597-599 2000

Effect of Orientation of Packing Structure on Liquid Flow Distribution in Trickle Bed Reviewed

M. Li, N. Iida, K. Yasuda, Y. Bando and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 33 ( 5 ) page： 811-814 2000

Liquid Flow Rate Distribution in Trickle Bed with Non-Uniformly Packed Structure Reviewed

M. Li, Y. Bando, K. Suzuki, K. Yasuda and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 33 ( 2 ) page： 211-216 2000

超音波キャビテーションを利用した気泡塔型反応の開発 Invited

安田啓司, 城美砂子, 谷川原亮, 坂東芳行, 中村正秋

化学工学シンポジウムシリーズ Vol. 71 page： 17-20 2000

油分含有排水処理に適した気泡塔の開発 Reviewed

坂東芳行, 田中孝幸, 安田啓司, 中村正秋, 川瀬信行

化学工学論文集 Vol. 26 ( 4 ) page： 620-622 2000

Effect of Equipment Dimensions on Ciculation Flow Rates of Liquid and Gas in Bubble Column with Draft Tube Reviewed

Y. Bando, K. Fujimori, H. Terazawa, K. Yasuda and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 33 ( 3 ) page： 379-385 2000

Flow and Heat Transfer Characteristics in Liquid-Solid Swirl Fluidized Bed Using Centrifugal Force Reviewed

Y. Bando, R. Suziki, Y. Tanaka, H. Sugita, K. Yasuda, Y. Sakurai and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 33 ( 2 ) page： 296-299 2000

超音波照射による水溶液中有機物の分解速度に及ぼす液混合効果 Reviewed

安田啓司, 城美砂子, 坂東芳行, 中村正秋

用水と排水 Vol. 42 ( 2 ) page： 127-131 2000

エアリフト式超音波反応器の開発 Invited

安田啓司, 城美砂子, 大鋸正慶, 坂東芳行, 中村正秋

ケミカルエンジニアリング Vol. 45 ( 4 ) page： 278-281 2000

一般廃棄物の乾燥特性に及ぼすCaO添加の影響 Reviewed

立元雄治, 坂東芳行, 安田啓司, 中村正秋, 畔上統雄

化学工学論文集 Vol. 25 ( 3 ) page： 355-360 1999

Effect of CaO Addition on Rotted Material Reviewed

Y. Tatemoto, Y. Bando, K. Yasuda, M. Nakamura and M. Azegami

Journal of Chemical Engineering of Japan Vol. 32 ( 4 ) page： 549-552 1999

Effect of Liquid Mixing on Performance of Porphyrin Decomposition by Ultrasonic Irradiation Reviewed

K. Yasuda, M. Tachi, Y. Bando and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 32 ( 3 ) page： 347-349 1999

Field Tests on Silica Removal from Geothermal Brines in Sumikawa and Onuma Geothermal Areas Reviewed

H. Sugita, K. Kato, A. Ueda, I. Matsunaga, Y. Sakurai, K. Yasuda, Y. Bando and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 32 ( 5 ) page： 696-700 1999

熱変性による硬化層が乾燥特性に与える影響 Reviewed

立元雄治, 坂東芳行, 安田啓司, 中村正秋, 畔上統雄

化学工学論文集 Vol. 25 ( 6 ) page： 929-934 1999

低ガス速度領域における気泡塔の液混合性能の改善 Invited

杉本達哉, 菅野有博, 安田啓司, 坂東芳行, 中村正秋

化学工学シンポジウムシリーズ Vol. 68 page： 42-47 1999

Wastewater Treatment by Anaerobic-Aerobic Activated Sludge Method in Bubble Column with Draft Tube Reviewed

Y. Bando, T. Kato, K. Yasuda, Y. Sakurai and M. Nakamura

Journal of Chemical Engineering of Japan Vol. 32 ( 6 ) page： 770-775 1999

On rhe Frequency Dependence of Ultrasonically Induced Birefiringence in Isotropic Phase of Liquid Crystal: 5CB(p-n-pentyl p'-cyanobiphenyl) Reviewed

T. Matsuoka, K. Yasuda, S. Koda and H. Nomura

Journal of Chemical Physics Vol. 111 ( 4 ) page： 1580-1586 1999

油脂含有排水処理に適した気泡塔の開発 Invited

田中孝幸, 安田啓司, 坂東芳行, 中村正秋

ケミカルエンジニアリング Vol. 44 ( 7 ) page： 529-532 1999

W/Oエマルション形成過程における重油の物性変化 Reviewed

安田啓司, 大曽根康裕, 坂東芳行, 中村正秋

化学工学論文集 Vol. 24 ( 6 ) page： 975-976 1998

Rotting Prevention by CaO in RDF Production Reviewed

Y. Tatemoto, Y. Bando, K. Yasuda, M. Nakamura and M. Azegami

Journal of Chemical Engineering of Japan Vol. 31 ( 5 ) page： 846-847 1998

超音波誘起複屈折からみた巨大分子のダイナミクス Invited

松岡辰郎, 安田啓司, 香田　忍, 野村浩康

応用物理 Vol. 67 ( 3 ) page： 318-322 1998

流出油のエマルジョン形成機構とその処理技術 Invited

安田啓司, 坂東芳行, 中村正秋

ケミカルエンジニアリング Vol. 43 ( 9 ) page： 690-693 1998

Dynamics of Entanglement Networks of Rodlike Micelles Studied by Measurements of Ultrasonically Induced Birefringence Reviewed

K. Yasuda, T. Mastuoka, S. Koda and H. Nomura

Journal of Physical Chemistry B Vol. 101 ( 7 ) page： 1138-1141 1997

Determinimg the Size of Colloidal Particles Using Ultrasonic Absorption Measurements Reviewed

T. Matsuoka, H. Kitano, K. Yasuda, S. Koda and H. Nomura

Japanese Journal of Applied Physics Vol. 36 ( 5B ) page： 2972-2975 1997

Frequency Dependence of Ultrasonically Induced Birefringence of Rodike Particles Reviewed

K. Yasuda, T. Matsuoka, S. Koda and H. Nomura

Journal of Physical Chemistry Vol. 100 ( 14 ) page： 5892-5897 1996

Quantification of Ultrasonic Intensity Based on Decomposition Reaction of Porphyrin Reviewed

H. Nomura, S. Koda, K. Yasuda and Y. Kojima

Ultrasonic Sonochemistry Vol. 3 ( 3 ) page： 153-156 1996

Ultrasonic Irradiation Effect on Porphyrin and Its Application for Quantification of Ultrasonic Intensity Reviewed

H. Nomura, S. Koda, K. Yasuda and Y. Kojima

Ultrasonics Vol. 34 ( 2-5 ) page： 555-557 1996

Particle Size Measurement of Polymer Latex Using Ultrasonic Method

K. Yasuda, H. Kitano, T. Matsuoka, S. Koda and H. Nomura

Report on Progress in Polymer Physics in Japan Vol. 39 page： 149-152 1996

コロイドの複屈折を超音波で起こす Invited

安田啓司, 松岡辰郎, 香田　忍, 野村浩康

超音波TECHNO Vol. 8 ( 6 ) page： 40-43 1996

鉛(Ⅱ)及び亜鉛(Ⅱ)ポルフィリン錯体の生成反応に対する超音波照射の効果 Reviewed

田端正明, 安田啓司, 香田　忍, 野村浩康

分析化学 Vol. 44 ( 2 ) page： 221-225 1995

Particle Size Measurement of Colloidal Silica Using Ultrasonic Method

T. Matsuoka, H. Kitano, K. Yasuda, S. Koda and H. Nomura

Reports on Progress in Polymer Physics in Japan Vol. 38 page： 141-142 1995

Dynamics of V₂O₅ Sol by Measurement of Ultrasonically Induced Birefringence Reviewed

K. Yasuda, T. Matsuoka, S. Koda and H. Nomura

Japanese Journal of Applied Physics Vol. 33 ( 5B ) page： 2901-2904 1994

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