Conductivity and microviscosity of electrolyte solutions containing polyethylene glycols
Conductivity and microviscosity of electrolyte solutions containing polyethylene glycols
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DOI：
10.1063/1.1605096
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发表时间：
2003-10-01
影响因子：
4.4
通讯作者：
Bezrukov, SM
中科院分区：
文献类型：
--
作者：
Stojilkovic, KS;Berezhkovskii, AM;Bezrukov, SM
在聚合物浓度高达33 wt. %的宽范围内测量了含有不同分子量的聚乙二醇（PEG）的氯化钾溶液的电导率。%的PEG 300、600、2000、4600和10 000。这些数据被用来找到微粘度的依赖性，η（微），其特征在于降低的离子迁移率相比，在无聚合物的溶液中，对聚合物的体积分数，φ。我们发现，这种依赖性很好地近似为一个简单的关系eta（micro）/eta（0）=exp[kphi/（1-phi）]，其中eta（0）是无聚合物溶液的粘度和k是一个拟合参数。参数k弱地依赖于聚合物分子量，从PEG 300的2.5增长到长链的接近2.9的极限值。利用微粘度的φ依赖性，我们给出了含PEG电解质溶液的电导率的实用公式。(C)2003年，美国物理学会。
Electrical conductivity of potassium chloride solutions containing polyethylene glycol (PEG) of different molecular mass was measured in a wide range of the polymer concentration up to 33 wt. % for PEG 300, 600, 2000, 4600, and 10 000. The data were used to find the dependence of microviscosity, eta(micro), which characterizes the decrease of the ion mobility compared to that in the polymer-free solution, on the polymer volume fraction, phi. We find that the dependence is well approximated by a simple relation eta(micro)/eta(0)=exp[kphi/(1-phi)], where eta(0) is viscosity of the polymer-free solution and k is a fitting parameter. Parameter k weakly depends on the polymer molecular mass growing from 2.5 for PEG 300 to its limiting value close to 2.9 for long chains. Using the phi-dependence of microviscosity, we give a practical formula for the conductivity of PEG-containing electrolyte solutions. (C) 2003 American Institute of Physics.