水介质中十二烷基三甲基溴化铵-苯乙烯微乳液介电特性的研究

IF 1.1 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
N. Rohman, T. Mohiuddin, Imran Khan
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引用次数: 0

摘要

本文报道了n -十二烷基三甲基溴化铵与苯乙烯水溶液微乳的复介电常数。在298.15 K温度下,改变苯乙烯与表面活性剂的浓度比S0(0.16≤So≤0.71)和表面活性剂浓度c(0.1032≤c (mol•dm-3)≤0.7806)。频率范围为100mhz ~ 89ghz。在278.15 ~ 328.15K的温度范围内对特定溶液进行了分析,以计算活化参数的能量。在298.15 K时,光谱可拟合到5个浓度相关德拜过程和3个温度相关德拜过程。胶束周围的Br-表面扩散和体扩散最好地描述了两种低频色散,分别在100 MHz和0.8 GHz。这些机制是用格罗斯理论来检验的。麦克斯韦-瓦格纳弛豫过程相当于0.8 GHz的高频胶束色散。胶束导电壳的厚度是用粒子的电导率和格罗斯理论的参数来确定的,结果与保利和施万模型的检验结果相当。采用Grosse模型和溶剂分散分析计算了胶束的体积分数。两种方法都是一致的。表面活性剂头基非旋转水合作用约为~7±1个水分子。苯乙烯的加入允许非旋转束缚容纳额外的~7±1个水分子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dodecyltrimethylammonium bromide-styrene microemulsion dielectric investigation in aqueous media
In this paper, we report the complex permittivity of aqueous microemulsions of N-dodecyltrimethylammonium bromide and styrene. The studies were carried out at 298.15 K while varying the styrene to surfactant concentration ratio, S0 (0.16 ≤ So ≤ 0.71) and the surfactant concentration, c (0.1032 ≤c (mol•dm-3 ) ≤ 0.7806). The frequencies ranged from 100 MHz to 89 GHz. An analysis of a particular solution is conducted over the temperature range of 278.15 to 328.15K in order to calculate the energy of the activation parameters. At 298.15 K, the spectra are fitted to a total of five Debye processes for concentration dependency series and three Debye processes for temperature dependence series. Br- surface and bulk diffusion surrounding the micelles best describes the two low frequency dispersions, at 100 MHz and 0.8 GHz, respectively. These mechanisms were examined using Grosse theory. The Maxwell-Wagner relaxation process is equivalent to high frequency micelle dispersion at 0.8 GHz. The thickness of the conducting shell of the micelle is determined by using the electrical conductivity of the particles and parameters taken from the Grosse theory, and the results are comparable to those from an examination of the Pauly and Schwan model. The Grosse model and solvent dispersion analysis were used to calculate the volume fractions of micelles. Both approaches were in agreement. The surfactant head group non-rotationally hydrates almost ~7±1 water molecules. Styrene addition allows for the non-rotationally bound accommodation of an additional ~7±1 water molecules.
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来源期刊
Canadian Journal of Chemistry
Canadian Journal of Chemistry 化学-化学综合
CiteScore
1.90
自引率
9.10%
发文量
99
审稿时长
1 months
期刊介绍: Published since 1929, the Canadian Journal of Chemistry reports current research findings in all branches of chemistry. It includes the traditional areas of analytical, inorganic, organic, and physical-theoretical chemistry and newer interdisciplinary areas such as materials science, spectroscopy, chemical physics, and biological, medicinal and environmental chemistry. Articles describing original research are welcomed.
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