Faculty Profiles - YASUDA, Keiji

Papers - YASUDA, Keiji

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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 Open Access

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

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 Open Access

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 Open Access

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 Open Access

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 Open Access

安田啓司

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

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Papers - YASUDA, Keiji