Nii Susumu, Oka Naoyoshi
Department of Chemical Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
Department of Chemical Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
Ultrason Sonochem. 2014 Nov;21(6):2032-6. doi: 10.1016/j.ultsonch.2014.03.033. Epub 2014 Apr 13.
Aqueous suspensions containing silica or polystyrene latex were ultrasonically atomized for separating particles of a specific size. With the help of a fog involving fine liquid droplets with a narrow size distribution, submicron particles in a limited size-range were successfully separated from suspensions. Performance of the separation was characterized by analyzing the size and the concentration of collected particles with a high resolution method. Irradiation of 2.4MHz ultrasound to sample suspensions allowed the separation of particles of specific size from 90 to 320nm without regarding the type of material. Addition of a small amount of nonionic surfactant, PONPE20 to SiO2 suspensions enhanced the collection of finer particles, and achieved a remarkable increase in the number of collected particles. Degassing of the sample suspension resulted in eliminating the separation performance. Dissolved air in suspensions plays an important role in this separation.
含有二氧化硅或聚苯乙烯胶乳的水悬浮液通过超声雾化来分离特定尺寸的颗粒。借助具有窄尺寸分布的细液滴形成的雾，成功地从悬浮液中分离出有限尺寸范围内的亚微米颗粒。通过用高分辨率方法分析收集到的颗粒的尺寸和浓度来表征分离性能。对样品悬浮液施加2.4MHz的超声波能够从90至320nm分离特定尺寸的颗粒，而无需考虑材料类型。向二氧化硅悬浮液中添加少量非离子表面活性剂PONPE20可增强更细颗粒的收集，并使收集到的颗粒数量显著增加。样品悬浮液的脱气导致分离性能消失。悬浮液中溶解的空气在这种分离中起着重要作用。
