title: Mutual Effects of Glycerol and Inorganic Salts on Their Hydration Abilities.
abstract: It is a tough challenge to understand the mutual interactions among various components in aqueous solutions of inorganic mixed with organic solutes. The hydration number, nh, and critical hydration number, ncr, determined by the measurements of glass transition of the solutions, in conjunction with tracing the change in local water structure, can provide some insights into the complicated interplays in such a mixture. Here, the nhand ncrfor aqueous solutions of glycerol, various chlorides, and mixtures of glycerol with a chloride are determined. The ratio of ncr/nhmeasures 4 for glycerol and 1.7 for all the chlorides, and for mixtures of glycerol with all of the chlorides except ZnCl2, it falls within these two extremes. Glycerol content dependence of nhand ncrreveals a rich and interesting scenario of mutual effects therein, in particular, the glycerol's replacement and sharing of hydration water with salt. In the case of ZnCl2, at most, one hydration water molecule is replaced by glycerol, and the excess glycerol molecules continuously reduce the number of glycerol molecules that share hydration water with ZnCl2. Our results can help establish a pathway for the investigation of interactions among the organic and inorganic components in aqueous solutions, which is desirable for many applications.
authors.affiliation: Department of Physics, University of Science and Technology Beijing , Beijing 100083, China.|Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Lishan
authors.initials: L
authors.lastname: Zhao
authors.affiliation: Department of Physics, University of Science and Technology Beijing , Beijing 100083, China.
authors.forename: Liqing
authors.initials: L
authors.lastname: Pan
authors.affiliation: Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Zexian
authors.initials: Z
authors.lastname: Cao
authors.affiliation: Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Qiang
authors.identifier: 0000-0002-8529-9325
authors.initials: Q
authors.lastname: Wang