Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (10): 3187.doi: 10.7503/cjcu20210320

• Physical Chemistry • Previous Articles     Next Articles

Crystal-like Hydrogels Consisting of Parallel Hexahedrons Obtained from the Self-assembly ofβCyclodextrin/perfluorononanoic Acid Inclusion Complexes

ZHANG Juan, HU Xinyue, WANG Hongbo, LIAN Ying, LE Jinyu, YANG Zihao   

  1. Unconventional Petroleum Research Institute,China University of Petroleum,Beijing 102249,China
  • Received:2021-05-08 Online:2021-10-10 Published:2021-10-10
  • Contact: ZHANG Juan
  • Supported by:
    the National Natural Science Foundation of China(21503274)

Abstract:

The inclusion complexes formed from cyclodextrins(CDs) and surfactants have been found to assemble into various aggregates and play important roles in supramolecular self-assembly. The self-assembly of β-cyclodextrin(β-CD)/perfluorononanoic acid(PFNA) system was investigated in solution. The phase diagram was obtained by changing the mixed ratio and total concentration of β-CD and PFNA. Interestingly, the hydrogels had crystal-like structure and were composed of inerratic parallel hexahedrons with the thickness of several nanometers and the length of more than a dozen microns. Based on the experimental results, the formation mechanism of the hydrogel was proposed: PFNA molecules were included by β-CD to form β-CD@PFNA complexes, which then piled into highly-ordered channels with the form of “head to head, tail to tail” of β-CD molecules. Then these channels were stacked tightly induced by hydrogen bonds and crystallized into parallel hexahedrons. These hexahedrons were cross-linked to form a three-dimensional network that wrapped the solvent to form hydrogels. This self-assembly strategy based on host and guest interaction of fluorocarbon surfactants and cyclodextrins is expected to provide a new idea for controlled self-assembly of novel aggregates.

Key words: Cyclodextrin, Perfluorononanoic acid, Self-assembly, Inclusion interaction, Crystal-like hydrogel

CLC Number: 

TrendMD: