研究者詳細 - 安田　啓司

論文 - 安田　啓司

分割表示 160 件中 1 - 20 件目／全件表示 >>

Characteristics of Ultrafine Bubbles (Bulk Nanobubbles) and Their Application to Particle-Related Technology ? 招待有り査読有り

Yasuda, K

KONA POWDER AND PARTICLE JOURNAL 41 巻 ( 0 ) 頁： 183 - 196 2024年3月

担当区分：筆頭著者,　最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：公益財団法人ホソカワ粉体工学振興財団

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

Web of Science

Scopus

CiNii Research

Evaluation of solvent property of air-water interface based on the fluorescence spectra of 1,2′-dinaphthylamine in the aqueous solution of ultrafine bubbles 査読有り

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

ANALYTICAL SCIENCES 40 巻 ( 2 ) 頁： 341 - 345 2024年2月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Web of Science

Scopus

PubMed

ウルトラファインバブルの特性と応用招待有り査読有り

安田啓司

表面と真空 66 巻 ( 11 ) 頁： 631 - 638 2023年11月

高効率ソノリアクタの開発招待有り査読有り

安田啓司, 朝倉義幸

日本音響学会誌 79 巻 ( 11 ) 頁： 569 - 575 2023年11月

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招待有り

安田啓司

超音波TECHNO 35 巻 ( 5 ) 頁： 50 - 53 2023年9月

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招待有り

安田啓司, 長谷川健太, 近藤博基, 堀勝

超音波TECHNO 34 巻 ( 5 ) 頁： 42 - 46 2022年10月

ウルトラファインバブルのソノケミストリーへの応用招待有り

Bulletin of the Japan Society of Sonochemistry 16 巻 ( 2 ) 頁： 26 - 34 2022年9月

ファインバブルの特徴招待有り

安田啓司

粉体技術 14 巻 ( 8 ) 頁： 597 - 601 2022年8月

Enrichment of amino acids from its aqueous solution by ultrasonic atomization and ultrafine bubbles 査読有り

61 巻頁： SG10321 - SG10325 2022年7月

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招待有り

安田啓司

超音波TECHNO 34 巻 ( 3 ) 頁： 83 - 87 2022年6月

Study on the efficiency of a transducer for sonochemistry by calorimetry 査読有り

Y. Asakura and K. Yasuda

Japanese Journal of Applied Physics 61 巻頁： GS1032 2022年5月

Curcumin-Loaded Liposome Preparation in Ultrasound Environment under Pressurized Carbon Dioxide 査読有り

Wahyudiono; He, JY; Hu, X; Machmudah, S; Yasuda, K; Takami, S; Kanda, H; Goto, M

FOODS 11 巻 ( 10 ) 頁： 1469 2022年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Foods

Curcumin-loaded liposomes were prepared using a supercritical carbon dioxide (SCCO2 )– ultrasound environment system. The experiments were performed at temperatures of 40–70◦C and pressures of 10–25 MPa in a batch system with ultrasonication for 60 min. Transmission electron microscopy (TEM) images revealed liposome products with spherical morphologies and diameters of <100 nm. Dynamic light scattering (DLS) analysis indicated that the curcumin-loaded liposome nanosuspension exhibited good stability. Changing the operating conditions influenced the amount of liposome-encapsulated curcumin; as the operating temperature or pressure increased, the diameter of the liposome products and the amount of liposome-encapsulated curcumin increased and decreased, respectively. Herein, we described an innovative and practical organic-solvent-free method for generating liposomes from phospholipids.

DOI： 10.3390/foods11101469

Web of Science

Scopus

PubMed

超音波照射によるウルトラファインバブルの発生と消滅招待有り

安田啓司, 朝倉義幸

混相流 36 巻 ( 1 ) 頁： 12 - 19 2022年3月