中国物理B ›› 2022, Vol. 31 ›› Issue (5): 56104-056104.doi: 10.1088/1674-1056/ac4237

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Structural and thermodynamic properties of inhomogeneous fluids in rectangular corrugated nano-pores

Yanshuang Kang(康艳霜)1,2, Haijun Wang(王海军)1,3,4,†, and Zongli Sun(孙宗利)5,‡   

  1. 1 College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China;
    2 College of Science, Hebei Agricultural University, Baoding 071001, China;
    3 Chemical Biology Key Laboratory of Hebei Province, Hebei University, Baoding 071002, China;
    4 Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, Hebei University, Baoding 071002, China;
    5 Department of Mathematics and Physics, North China Electric Power University, Baoding 071003, China
  • 收稿日期:2021-09-06 修回日期:2021-11-24 发布日期:2022-04-21
  • 通讯作者: Haijun Wang,E-mail:whj@hbu.edu.cn;Zongli Sun,E-mail:sunzl@ncepu.edu.cn E-mail:whj@hbu.edu.cn;sunzl@ncepu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No.21503077),the Fundamental Research Fund for the Central Universities of China (Grant No.2020MS147),and the Science and Technology Project of Hebei Education Department,China (Grant No.QN2018119).

Structural and thermodynamic properties of inhomogeneous fluids in rectangular corrugated nano-pores

Yanshuang Kang(康艳霜)1,2, Haijun Wang(王海军)1,3,4,†, and Zongli Sun(孙宗利)5,‡   

  1. 1 College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China;
    2 College of Science, Hebei Agricultural University, Baoding 071001, China;
    3 Chemical Biology Key Laboratory of Hebei Province, Hebei University, Baoding 071002, China;
    4 Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, Hebei University, Baoding 071002, China;
    5 Department of Mathematics and Physics, North China Electric Power University, Baoding 071003, China
  • Received:2021-09-06 Revised:2021-11-24 Published:2022-04-21
  • Contact: Haijun Wang,E-mail:whj@hbu.edu.cn;Zongli Sun,E-mail:sunzl@ncepu.edu.cn E-mail:whj@hbu.edu.cn;sunzl@ncepu.edu.cn
  • About author:2021-12-11
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No.21503077),the Fundamental Research Fund for the Central Universities of China (Grant No.2020MS147),and the Science and Technology Project of Hebei Education Department,China (Grant No.QN2018119).

摘要: Based on the free-energy average method, an area-weighted effective potential is derived for rectangular corrugated nano-pore. With the obtained potential, classical density functional theory is employed to investigate the structural and thermodynamic properties of confined Lennard-Jones fluid in rectangular corrugated slit pores. Firstly, influence of pore geometry on the adsorptive potential is calculated and analyzed. Further, thermodynamic properties including excess adsorption, solvation force, surface free energy and thermodynamic response functions are systematically investigated. It is found that pore geometry can largely modulate the structure of the confined fluids, which in turn influences other thermodynamic properties. In addition, the results show that different geometric elements have different influences on the confined fluids. The work provides an effective route to investigate the effect of roughness on confined fluids. It is expected to shed light on further understanding about interfacial phenomena near rough walls, and then provide useful clues for the design and characterization of novel materials.

关键词: free-energy average, rectangular corrugated pore, density functional

Abstract: Based on the free-energy average method, an area-weighted effective potential is derived for rectangular corrugated nano-pore. With the obtained potential, classical density functional theory is employed to investigate the structural and thermodynamic properties of confined Lennard-Jones fluid in rectangular corrugated slit pores. Firstly, influence of pore geometry on the adsorptive potential is calculated and analyzed. Further, thermodynamic properties including excess adsorption, solvation force, surface free energy and thermodynamic response functions are systematically investigated. It is found that pore geometry can largely modulate the structure of the confined fluids, which in turn influences other thermodynamic properties. In addition, the results show that different geometric elements have different influences on the confined fluids. The work provides an effective route to investigate the effect of roughness on confined fluids. It is expected to shed light on further understanding about interfacial phenomena near rough walls, and then provide useful clues for the design and characterization of novel materials.

Key words: free-energy average, rectangular corrugated pore, density functional

中图分类号:  (Theory and models of liquid structure)

  • 61.20.Gy
62.10.+s (Mechanical properties of liquids)