ABSTRACT

Complex dielectric spectra of the binary mixture of benzonitrile (BNZ) with acetophenone (ACPH) have been carried out at 11 different concentrations in the frequency range of 10 MHz to 40 GHz at four different temperatures (10°C, 15°C, 20°C and 25°C) using Time Domain Reflectometry technique. Static dielectric constant (ε₀), relaxation time (τ) are obtained for above mentioned temperatures using nonlinear least squares fit method and density and refractive index are obtained at room temperature (25°C). These parameters are used to calculate the excess static dielectric constant (ε₀^E) and excess inverse relaxation time (1/τ)^E, excess molar volume (V_m^E), effective Kirkwood correlation factor (g^eff), Bruggeman factor (f_B) and thermodynamic parameters such as enthalpy and entropy of activation of BNZ-ACPH mixture. Static dielectric constant decreases with increasing temperature and increasing concentration of ACPH in BNZ. The deviance in the excess parameters shows the strength of the molecular interactions and the presence of intermolecular interaction between unlike molecules. The measurement of Kerr constant (B) of the binary mixture of BNZ-ACPH have been reported for the wavelengths 632.8 nm and 512 nm for 5 different concentrations at room temperature using Electro-Optic Kerr Effect method. The change in the Kerr constant was observed for the different concentrations associated with the pure liquids. This deviation shows the non-additive behaviour and which is in good agreement with the dielectric parameters of the system under study. Also, the FTIR spectra have been obtained of BNZ-ACPH mixture to have a good agreement with the dielectric study.

摘要

苯腈 (BNZ) 与苯乙酮 (ACPH) 的二元混合物的复杂介电光谱已在 10 MHz 至 40 GHz 频率范围内的 11 种不同浓度下在四种不同温度（10°C、15°C、20° C 和 25°C）使用时域反射技术。静态介电常数 (ε ₀ )、弛豫时间 (τ) 在上述温度下使用非线性最小二乘拟合法获得，密度和折射率在室温 (25°C) 下获得。这些参数用于计算过量静态介电常数 (ε ₀ ^E ) 和过量逆弛豫时间 (1/τ) ^E、过量摩尔体积 (V _m ^E )、有效柯克伍德相关系数 (g ^eff), 布鲁格曼因子 (f _B) 和热力学参数，例如 BNZ-ACPH 混合物的活化焓和熵。静态介电常数随着温度升高和 BNZ 中 ACPH 浓度的增加而降低。过量参数的偏差显示了分子相互作用的强度和不同分子之间分子间相互作用的存在。已经报道了 BNZ-ACPH 二元混合物的克尔常数 (B) 的测量，在 632.8 nm 和 512 nm 的波长下，在室温下使用电光克尔效应方法测量了 5 种不同的浓度。对于与纯液体相关的不同浓度，观察到克尔常数的变化。这种偏差表明了非加性行为，并且与所研究系统的介电参数非常吻合。还，