著者

安田 啓司

出版者

日本エアロゾル学会

雑誌

エアロゾル研究 (ISSN:09122834)

巻号頁・発行日

vol.26, no.1, pp.5-10, 2011 (Released:2011-04-12)

参考文献数

6

被引用文献数

1

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Separation characteristics of various solutes from the aqueous solutions with ultrasonic atomization were experimentally investigated. Monohydric alcohols and ketone were concentrated in the atomized droplets from the aqueous solution, while alcohol and amides were diluted in the droplets. These results suggest that the hydrophilic and hydrophobic properties of solute molecules may determine the separation characteristics of ultrasonic atomization. In order to develop a concentrator with ultrasonic atomization, ultrasonic atomization of ethanol aqueous solution was conducted. The atomization rate of water was the highest at the beginning of atomization, and the initial depth of solution which gave the maximum atomization rate of water was decreased with increasing the ultrasonic frequency. The atomization rate of ethanol was increased with the net electric power applied to the ultrasonic transducer, but it remained almost constant at different ultrasonic frequencies. At a relatively high net electric power, the atomization rate of water increased with the diameter of reservoir, while alcohol content in the atomized droplets were unaffected by the reservoir diameter.

著者

安田 啓司

出版者

公益社団法人 日本化学会

雑誌

化学と教育 (ISSN:03862151)

巻号頁・発行日

vol.67, no.8, pp.350-353, 2019-08-20 (Released:2020-08-01)

参考文献数

8

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超音波によって,室温・大気圧で水中の汚染物質の分解,有価物質の分離をすることができる。汚染物質の分解は超音波キャビテーションに起因し,有機物質,高分子,病原菌などを熱やラジカルにより分解する。有価物質の分離では超音波霧化によりアルコール,界面活性剤,アミノ酸などを液滴中に濃縮する。本稿では,分解・分離のメカニズムと物質による挙動の違いについて概説する。

著者

大常 雄基 安田 啓司 朝倉 義幸

出版者

日本ソノケミストリー学会

雑誌

ソノケミストリー討論会講演論文集 25 (ISSN:24241512)

巻号頁・発行日

pp.39-40, 2016 (Released:2017-07-21)

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To investigate generation of ultrasonic cavitation in gel, sodium polyacrylate swollen in potassium iodide solution was used as a sample. After ultrasonic irradiation at 500 kHz, absorbance and viscosity of sample were measured. The absorbance and viscosity changes are originated from oxidation reaction of potassium iodide and decrease in the degree of polymerization of sodium polyacrylate, respectively. The absorbance started to increase after several minutes irradiation. On the other hand, viscosity decreases immediately after irradiation. This is because polymer is degraded due to shear stress of ultrasonic propagation in addition to cavitation. After sample viscosity fully decreased, it is able to generate ultrasonic cavitation and chemical reaction occurs. As sample temperature became lower, the viscosity decreased and the absorbance increased. To use this sample, detection of cavitation generation in gel is possible.

著者

竹村 洸亮 安田 啓司 朝倉 義幸

出版者

日本ソノケミストリー学会

雑誌

ソノケミストリー討論会講演論文集 (ISSN:24241512)

巻号頁・発行日

pp.41-42, 2016 (Released:2017-07-21)

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Ethanol and organic material mixed aqueous solution were atomized using ultrasonic irradiation at 2.4 MHz. Atomized liquid was collected by refrigeration of liquid nitrogen. The concentrations in collected liquid and mist were experimentally investigated. Malic acid, lactic acid (organic acid), 1-propanol, methanol (alcohol), methyl ethyl ketone, diethyl ketone (ketone) were used as organic material. The ethanol concentration in collected liquid was little affected by addition of organic materials. Organic acid in ethanol aqueous solution was not separated. On the other hand, alcohol and ketone concentrations in collected liquid were higher than those in sample. The 1-propanol concentration in collected liquid was lower than that in mist. This is because it is difficult to collect nano-sized droplets which contain highly condensed alcohol.