Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (12): 1803-1817.DOI: 10.19894/j.issn.1000-0518.220053

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Progress in Molecular Dynamics and Hansen Solubility Parameters of Low Molecular Weight Gels

Wan-Nian ZHANG1, Fang YU2,3, Shan-Lin ZHAO1,3, Zhi-Qiang ZHANG1(), Yu-Peng HE1,2,3()   

  1. 1.Key Laboratory for Functional Material,Educational Department of Liaoning Province,School of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,China
    2.State Key Laboratory of Fine Chemicals,Ningbo Institute of Dalian University of Technology,Ningbo 315016,China
    3.Key Laboratory of Petrochemical Catalytic Science and Technology,Liaoning Petrochemical University,Fushun 113001,China
  • Received:2022-03-01 Accepted:2022-08-03 Published:2022-12-01 Online:2022-12-13
  • Contact: Zhi-Qiang ZHANG,Yu-Peng HE
  • About author:heyp_nbi@dlut.edu.cn
    azzq@ustl.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21978124);the Key R&D Projects in Liaoning Province(2019JH2/10100005)

Abstract:

Recently, the use of computational methods such as Molecular Dynamics (MD) simulations and Hansen Solubility Parameters (HSPs) to study the behavior of small molecule gelators has attracted much attention. MD simulation is a computational method based on classical mechanics and is one of the preferred techniques for understanding the process of small molecule gelators. The MD simulation can more accurately analyze the gelation trend or assembly behavior of small molecule gelators, dynamically and graphically display the self-assembly process, effectively reveal the relationship between the structure of small molecule gelators and related gelation behavior, and quantitatively analyze non-covalent bond interactions such as hydrogen bonds, π-π stacking, van der Waals interactions, ionic bonding and solvophobic interactions. By performing molecular dynamics simulations on known gelators/non-gelators, parameters related to gelation behavior in the simulated data are extracted, and the linear correlation is measured by fitting the Pearson correlation coefficient to finally predict the gelation behavior of a certain class of small molecules. On the other hand, the empirical model developed according to the HSPs is the most representative, which consists of the energy of dispersion interaction (δd), the energy of polar interaction (δp) and H-bonding energy (δh) between molecules. These three parts determine the coordinate point of the three-dimensional space (Hansen space). According to the range of the point, it can be determined whether the organic small molecule can form a gel in a specific solvent. In this paper, representative works published recently in the field of organic small molecule gels by using MD simulations and empirical models are reviewed. Some comments on the assembly behavior of gelators, the regulation and prediction of non-covalent bond interactions on gelation ability are made.

Key words: Low molecular mass gels, Molecular dynamics simulations, Hansen solubility, Non-covalent interactions, Assembly behavior, Computational chemistry

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