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Thermocontrolling ion permeation through binary component membrane composed of crown ether liquid crystal/PVC
Author(s) -
Qin Jun,
Xie MingGui,
Jiang Qing,
Zhao HuaMing,
Liu ShengChong,
Tao ChangYuan
Publication year - 1995
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19950130102
Subject(s) - chemistry , crown ether , membrane , arrhenius equation , permeation , liquid crystal , ion transporter , ether , ionic bonding , ion , biological membrane , chemical physics , thermodynamics , activation energy , organic chemistry , materials science , biochemistry , physics , optoelectronics
In view of the nature of orderness in structure and the mesomorphism in property of liquid crystal, the function of which is further exploited by integrating it with the feature of crown ether. The monoarmed crown ether liquid crystals are successfully applied to the imitation of biomembrane transport. Binary component membrane composed of crown ether liquid crystal and PVC was first developed. Such a novel model of biomimetic membrane is capable of imitating ingeniously the thermocontrolling transport of biomembrane, thus the essential function of liquid crystal in membane transport is more fully exploited. It was suggested, consequently, that the molecules of the crown ether liquid crystal could assemble themselves to form ionic channels, as they exist in mesophase. Of still more significance is that the thermocontrolling transport of ions through the membrane is found to be operative selectively and the permeation of ion is under the direct influence of the thermal turmoil of the crown ether liquid crystal molecules as substantiated by the values of Arrhenius thermodynamic parameters, activation energy, E a, and logarithmic Arrhenius constant, log A, in ion transport. Based on the aforementioned it is suggested that diffusion of ions is a rate determing step and change of rate of ion transport is varied in different phase. Influence of magnetic field on transport rate is investigated. On basis of above experimental findings, a dynamical equation of ion transportation is established which is applicable for the membrane system in general on one hands and expound the ion transport mechanism through the membrane on the other.