Faculty Profiles - YASUDA, Keiji

Papers - YASUDA, Keiji

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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 Open Access

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 Open Access

Yasuda Keiji, Tomofumi Sato, Asakura Yoshiyuki

Chemical Engineering Science Vol. 217 page： 115527 2020.5

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 Open Access

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

<p>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.</p>

DOI： 10.1252/jcej.18we183

Web of Science

Scopus

CiNii Research

Generation and Reduction of Bulk Nanobubbles by UIltrasonic Irradiation Reviewed Open Access

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

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 Open Access

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

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Papers - YASUDA, Keiji