Controlling crystal size under stationary wave field given by a high frequency ultrasound

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630388
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Properties in chemical engineering process/Transfer operation/Unit operation
• Research Institution: Kagoshima University (2015); Nagoya University (2014)
• Principal Investigator: Nii Susumu 鹿児島大学, 理工学域工学系, 教授 (90262865)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 超音波 / 結晶 / 物質移動 / 粒子径

Outline of Final Research Achievements

Antisolvent crystallization of glycine was conducted under a standing-wave field created by irradiating high frequency ultrasound. With the help of acoustic pressure working on glycine particles, they located highly regularly in the liquid with an interval corresponds to a single wave length. Particles were oriented to direct the longer axis horizontally. Particles glowed with the progress of time under a given ultrasonic power. The size distribution also changed with a transient of time. Therefore, particle size is controlled by choosing an appropriate time for the irradiation. Crystallization behavior of glycine was quite different under a different aspect of wave-field in which acoustic streaming is prevailing. Under the acoustic streaming, no particle orientation and regular locating was obtained. There was no change in particle size with time, and the size was similar to the value obtained at initial stage for the case of standing wave-field.

Free Research Field

化学工学、物質移動