The local fluid structure of a solution consisting of colloid particles and hydrogen bonding（HB） fluid se-parated from pure solvent by a semipermeable membrane was investigated, where the colloid particles and HB fl...The local fluid structure of a solution consisting of colloid particles and hydrogen bonding（HB） fluid se-parated from pure solvent by a semipermeable membrane was investigated, where the colloid particles and HB fluidserve as solute and solvent, respectively. In this paper, the semipermeable membrane allows the passage of solventmolecules but not solute particles, and therefore, it provides a nano-confinement for colloid particles. The densityprofiles 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, func-tionality, total bulk density, density fraction and the size ratio of two species on the fluid structure were discussed. Asan application, the osmotic pressures of the system were also presented. It is shown that the local structure andosmotic pressure can be efficiently regulated by these factors due to the competition between the excluded volumeinteractions and the FIB interaction. The present results are expected to be helpful to study the osmotic phenomenaand relevant problems on the nanoscale.展开更多
文摘The local fluid structure of a solution consisting of colloid particles and hydrogen bonding（HB） fluid se-parated from pure solvent by a semipermeable membrane was investigated, where the colloid particles and HB fluidserve as solute and solvent, respectively. In this paper, the semipermeable membrane allows the passage of solventmolecules but not solute particles, and therefore, it provides a nano-confinement for colloid particles. The densityprofiles 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, func-tionality, total bulk density, density fraction and the size ratio of two species on the fluid structure were discussed. Asan application, the osmotic pressures of the system were also presented. It is shown that the local structure andosmotic pressure can be efficiently regulated by these factors due to the competition between the excluded volumeinteractions and the FIB interaction. The present results are expected to be helpful to study the osmotic phenomenaand relevant problems on the nanoscale.
