Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (2): 248-254.doi: 10.1007/s40242-017-6398-1

• Articles • Previous Articles     Next Articles

Structure of Solution of Colloid and Hydrogen Bonding Fluid Near a Semipermeable Membrane

ZHAO Meng1, CHEN Hanfei1, GU Fang1, WANG Haijun1,2,3   

  1. 1. College of Chemistry and Environmental Science, Hebei University, Baoding 071002, P. R. China;
    2. Chemical Biology Key Laboratory of Hebei Province, Hebei University, Baoding 071002, P. R. China;
    3. Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, Hebei University, Baoding 071002, P. R. China
  • Received:2016-09-29 Revised:2016-11-07 Online:2017-04-01 Published:2016-12-12
  • Contact: GU Fang,E-mail:fanggu@hbu.edu.cn;WANG Haijun,E-mail:whj@hbu.edu.cn E-mail:fanggu@hbu.edu.cn;whj@hbu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.21374028, 21306034), the Natural Science Foundation of Hebei Province, China(No.B2014201103) and the Project for Top Young Talent of Hebei Province, China.

Abstract:

The local fluid structure of a solution consisting of colloid particles and hydrogen bonding(HB) fluid separated from pure solvent by a semipermeable membrane was investigated, where the colloid particles and HB fluid serve as solute and solvent, respectively. In this paper, the semipermeable membrane allows the passage of solvent molecules but not solute particles, and therefore, it provides a nano-confinement for colloid particles. The density profiles of the two species near the semipermeable membrane were determined via density functional theory(DFT) for classical fluids. Based on the predicted density profiles under various conditions, the effects of HB strength, functionality, total bulk density, density fraction and the size ratio of two species on the fluid structure were discussed. As an application, the osmotic pressures of the system were also presented. It is shown that the local structure and osmotic pressure can be efficiently regulated by these factors due to the competition between the excluded volume interactions and the HB interaction. The present results are expected to be helpful to study the osmotic phenomena and relevant problems on the nanoscale.

Key words: Hydrogen bonding fluid, Semipermeable membrane, Osmotic pressure, Density functional theory