论文标题
通过电光谱和激光相关光谱法测量的电解质溶液测定纳米流体的Zeta势率
Determination of zeta-potential of nanofluids based on electrolyte solutions from the measurements by the methods of electrical spectroscopy and laser correlation spectroscopy
论文作者
论文摘要
这项工作讨论了Zeta势力对基于电解质的纳米颗粒悬浮液的测量问题。提出了一种理论，即弥漫性电层（包括相互层（停滞）层）对此类悬浮液的有效电导率的影响。该理论基于紧凑型不均匀性基团的方法，该方法应用于嵌入的硬核 - 螺旋壳颗粒的模型系统中，将基础液体与碱液体嵌入在一起的电导率均匀宿主中。芯代表颗粒。壳在径向方向上是电不均匀的，它们的电导率曲线是连续的功能。该模型可以在静态极限下进行严格分析。从积分关系中可以找到所需的电导率，这使我们能够以zeta势能，停滞层的厚度，矩阵摩尔度等的术语表达电导率。该理论揭示了根据停滞层的地质和电气参数的不同行为情况的存在。结果表明，厚度和zeta电位之间的功能依赖性可以从电导率的变化速率中获得，浓度稀释的悬浮液。可以通过实验测量此速率。可以指出的是，可以从Smoluchowski-Einstein扩散系数中获得纳米颗粒的流体动力半径，可以通过激光相关光谱法测量。为了找到zeta势力，有必要同时进行一系列独立的测量：找到电导率的斜率并估计停滞层的厚度。
The work discusses the problem of measurement of the zeta-potential for electrolyte-based suspensions of nanoparticle. A theory is presented for the effect of the diffuse electric double layer, including the interphase (stagnant) layer, on the effective conductivity of such suspensions. The theory is based on the method of compact groups of inhomogeneities applied to a model system of hard-core-penetrable-shell particles embedded together with the base liquid in a uniform host of the conductivity. The cores represent the particles. The shells are electrically inhomogeneous in the radial direction, their conductivity profile being a continuous function. This model is possible to analyze rigorously in the static limit. The desired conductivity is found from the integral relation which allows us to express the electrical conductivity in the terms of the zeta-potential, thickness of the stagnant layer, matrix molarity, etc. The theory reveals the existence of different scenarios of behavior of the conductivity depending on the geometrical and electrical parameters of the stagnant layer. It is shown that the functional dependence between the thickness and zeta-potential can be obtained from the rate of change of the conductivity with concentration for diluted suspensions; this rate can be measured experimentally. It is pointed out that the hydrodynamic radius of a nanoparticle can be obtained from the Smoluchowski-Einstein diffusion coefficient, which can be measured by the method of laser correlation spectroscopy. In order to find the zeta-potential, it is necessary to simultaneously do a series of independent measurements: find the slope of the conductivity and estimate the thickness of the stagnant layer.
