文献类型：期刊文献

英文题名：Size-Dependent Spontaneous Separation of Colloidal Particles in Sub-Microliter Suspension by Cations

作者：Sheng, Shiqi[1];Yang, Haijun[2,3];Song, Yongshun[1];Chen, Ruoyang[1];Liang, Shanshan[1];Fang, Haiping[1,4]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Interdisciplinary Res Ctr, Shanghai Adv Res Inst,ZJLab, Zhangjiang Lab SSRF,Shanghai Synchrotron Radiat F, Shanghai 201204, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Appl Phys, CAS Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China;[4]Univ Chinese Acad Sci, Wenzhou Inst, Wenzhou 325001, Peoples R China

年份：2022

卷号：23

期号：15

外文期刊名：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000838893700001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 12005062, 11974366, U1632135, 12004110), the Fundamental Research Funds for the Central Universities, China.

语种：英文

外文关键词：size-dependent separation; large separation distance; sub-microliter suspension; hydrated cation-pi interaction

摘要：Great efforts have been made to separate micro/nanoparticles in small-volume specimens, but it is a challenge to achieve the simple, maneuverable and low-cost separation of sub-microliter suspension with large separation distances. By simply adding trace amounts of cations (Mg2+/Ca2+/Na+), we experimentally achieved the size-dependent spontaneous separation of colloidal particles in an evaporating droplet with a volume down to 0.2 mu L. The separation distance was at a millimeter level, benefiting the subsequent processing of the specimen. Within only three separating cycles, the mass ratio between particles with diameters of 1.0 mu m and 0.1 mu m can be effectively increased to 13 times of its initial value. A theoretical analysis indicates that this spontaneous separation is attributed to the size-dependent adsorption between the colloidal particles and the aromatic substrate due to the strong hydrated cation-pi interactions.