In this study, thermo physical properties such as density, viscosity, refractive index and surface tension of aqueous solutions of tetramethylammonium hydroxide (TMAOH), tetraethylammonium hydroxide (TEAOH), tetrapropylammonium hydroxide (TPAOH) and tetrabutylammonium hydroxide (TBAOH) was investigated as a function of temperature. These properties were measured in temperatures ranging from 298.15 to 333.15 K and the temperature was increased by an interval of 5 K from 298.15 K and after 303.15 K, it was increased by an interval of 10 K, while the concentrations of all the aqueous solutions were changed from 2.5 to 30 mass percent. The results revealed that the measured properties of all aqueous ILs are inversely related to temperature, while the increase in concentration had different effects on these properties. In the case of density, an increase in the concentration of ILs TMAOH and TEAOH increased their density, while the increase in the concentration of TPAOH and TBAOH decreased their density. On the other hand, the viscosities and refractive indices of all aqueous ILs increased with an increase in concentration, but the surface tensions decreased with the increase in concentration. The derived properties including thermal expansion and excess molar volume of all the aqueous ILs were determined using density data. The thermal expansion data showed an increasing trend with an increase in the temperatures and concentrations of ILs whereas the negative values of excess molar volumes decreased with an increase in temperatures. The correlation of thermo physical properties with temperatures exhibits a good agreement between experimental and predicted values.

在这项研究中，研究了热物理性能，例如氢氧化四甲铵（TMAOH），氢氧化四乙铵（TEAOH），氢氧化四丙铵（TPAOH）和氢氧化四丁铵（TBAOH）水溶液的密度，粘度，折射率和表面张力。温度。在298.15至333.15 K的温度范围内测量了这些性能，温度从298.15 K升高了5 K，在303.15 K之后又升高了10 K，而所有水溶液的浓度均为从2.5质量％更改为30质量％。结果表明，所有水性IL的测量性质与温度成反比，而浓度的增加对这些性质有不同的影响。在密度的情况下，ILs TMAOH和TEAOH浓度的增加会增加它们的密度，而TPAOH和TBAOH浓度的增加会降低它们的密度。另一方面，所有水性IL的粘度和折射率随浓度的增加而增加，但是表面张力随浓度的增加而降低。使用密度数据确定所有水性IL的衍生性质，包括热膨胀和过量的摩尔体积。热膨胀数据显示出随着温度和ILs浓度的增加而增加的趋势，而过量摩尔体积的负值随温度的增加而减小。热物理性质与温度的相关性在实验值和预测值之间显示出良好的一致性。