The viscosity (η) of dextran (Dex), methyl cellulose (MC), hydroxypropylmethyl cellulose (HPMC), κ-carrageenan (KC), alginate (Alg), and carboxymethyl cellulose (CMC) was measured as a function of the shear rate (γ̇) over a broad range of concentrations both in salt-free water and in 0.1 M NaCl. The concentration (C) dependence of the Newtonian viscosity (η₀) was found to be universal for neutral polysaccharides and anionic polysaccharides in 0.1 M NaCl when C was multiplied with the intrinsic viscosity. The dependence was compared with theoretical predictions assuming dominant hydrodynamic or dominant topological interactions. The effect of electrostatic interactions was observed for anionic polysaccharides in salt-free water but not at higher concentrations. Master curves of the shear thinning behavior at different concentrations were obtained when η/η₀ was plotted versus τ. γ̇, with τ being a concentration-dependent time that characterizes the onset of shear thinning. Binary mixtures of two neutral polysaccharides (MC and HPMC), two anionic polysaccharides (Alg and CMC), and a neutral (Dex) and anionic polysaccharide (KC) were investigated as a function of the composition and the total polysaccharide concentration. The behavior of the first two mixtures was similar to that of a single polysaccharide with an intermediate intrinsic viscosity. Significant synergy was observed for the third type of mixtures in salt-free water demonstrating the important effect of electrostatic interactions between charged polysaccharides at low concentrations even in concentrated solutions of neutral polysaccharides.

中文翻译：

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多糖水溶液和选定的均相二元混合物的粘度

测量了葡聚糖（Dex），甲基纤维素（MC），羟丙基甲基纤维素（HPMC），κ-角叉菜胶（KC），藻酸盐（Alg）和羧甲基纤维素（CMC）的粘度（η）作为剪切速率的函数（γ̇）在无盐水中和0.1 M NaCl中的宽浓度范围内。的浓度（C ^）的牛顿粘度的依赖性（η ₀）被认为是通用的中性多糖和阴离子多糖在0.1M的NaCl时Ç乘以特性粘度。将该依赖性与假设主要流体动力学或主要拓扑相互作用的理论预测进行了比较。在无盐水中观察到了阴离子多糖的静电相互作用的影响，但在较高浓度下没有观察到。获得在不同浓度的剪切稀化行为的主曲线时η/η ₀相对于τ作图。γ̇，其中τ是与浓度相关的时间，该时间表征剪切稀化的开始。研究了两种中性多糖（MC和HPMC），两种阴离子多糖（Alg和CMC），中性多糖（Dex）和阴离子多糖（KC）的二元混合物随组成和总多糖浓度的变化。前两种混合物的行为类似于具有中等特性粘度的单一多糖的行为。在无盐水中观察到第三种混合物的显着协同作用，证明了即使在浓缩的中性多糖溶液中，低浓度带电多糖之间的静电相互作用也具有重要作用。