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Synthesis, thermal stability and surface activity of imidazolium monomeric surfactants
Journal of Molecular Liquids ( IF 6 ) Pub Date : 2020-04-02 , DOI: 10.1016/j.molliq.2020.113006
Vinit Sharma , Chetna Bhatia , Manpreet Singh , Chitra Singh , S.K. Upadhyaya , Kamal Kishore

The renewable raw material-based imidazolium cationic monomeric surfactants have been prepared and characterized by FTIR, 1HNMR and TGA. The conductometric study of 3-(2-(decanoyloxy)ethyl)-1-methyl-1H-imidazol-3-ium-bromide (capric surfactant) and 3-(2-(octadecanoyloxy)ethyl)-1-methyl-1H-imidazol-3-ium-bromide (stearic surfactant) with different concentrations at 298 K, 303 K, 308 K and 313 K in ethanol; indicates that these surfactants behave as weak electrolytes. The thermodynamic parameters calculated from conductivity measurements indicate that micellization is favoured over dissociation process. The results of density and viscosity measurements have been satisfactorily explained by well-known equations with their allied parameters. The surface-active properties of capric and stearic surfactant have been measure at 298 K in water and ethanol. The Gibb's adsorption isotherm confirm that derivative of surface tension with respect to natural logarithm of concentration is negative, indicating that adsorption is positive in nature i.e. surface tension of the solution is lowered by addition of surfactant molecules. The thermo-gravimetric analysis (TGA) indicates that these surfactants are thermally stable up to 370 °C. Activation energy for thermal decomposition was found to be in the range of 14.00–26.06 kJ/mol and thermal stability is more for surfactants having higher hydrocarbon chain than lower one. The information collected from conductance, density and viscosity as well as surface tension measurements has shown that there is significant interaction between surfactant molecules at certain concentration (CMC).



中文翻译:

咪唑鎓单体表面活性剂的合成,热稳定性和表面活性

制备了可再生原料基咪唑鎓阳离子单体表面活性剂,并用FTIR,1表征HNMR和TGA。3-(2-(癸酰氧基)乙基)-1-甲基-1H-咪唑-3-溴化铵(癸酸表面活性剂)和3-(2-(十八烷酰氧基)乙基)-1-甲基-1H-的电导研究乙醇中在298 K,303 K,308 K和313 K时具有不同浓度的咪唑3溴化铵(硬脂表面活性剂); 表明这些表面活性剂表现为弱电解质。由电导率测量值计算出的热力学参数表明,胶束化作用优于解离过程。密度和粘度测量的结果已通过众所周知的方程式及其相关参数得到了令人满意的解释。已经在水和乙醇中在298 K下测量了癸酸和硬脂酸表面活性剂的表面活性。吉布 吸附等温线证实表面张力相对于浓度自然对数的导数为负,表明吸附本质上为正,即通过添加表面活性剂分子降低了溶液的表面张力。热重分析(TGA)表明,这些表面活性剂在高达370°C的温度下具有热稳定性。发现用于热分解的活化能在14.00–26.06 kJ / mol的范围内,并且具有较高烃链的表面活性剂比较低烃链的表面活性剂的热稳定性更高。从电导率,密度和粘度以及表面张力测量中收集的信息表明,在一定浓度(CMC)下,表面活性剂分子之间存在显着的相互作用。通过添加表面活性剂分子降低溶液的表面张力。热重分析(TGA)表明,这些表面活性剂在高达370°C的温度下具有热稳定性。发现用于热分解的活化能在14.00–26.06 kJ / mol的范围内,并且具有较高烃链的表面活性剂比较低烃链的表面活性剂的热稳定性更高。从电导率,密度和粘度以及表面张力测量中收集的信息表明,在一定浓度(CMC)下,表面活性剂分子之间存在显着的相互作用。通过添加表面活性剂分子降低溶液的表面张力。热重分析(TGA)表明,这些表面活性剂在高达370°C的温度下具有热稳定性。发现用于热分解的活化能在14.00–26.06 kJ / mol的范围内,并且具有较高烃链的表面活性剂比较低烃链的表面活性剂的热稳定性更高。从电导率,密度和粘度以及表面张力测量中收集的信息表明,在一定浓度(CMC)下,表面活性剂分子之间存在显着的相互作用。具有较高烃链的表面活性剂比较低烃链的表面活性剂具有06 kJ / mol和更高的热稳定性。从电导率,密度和粘度以及表面张力测量中收集的信息表明,在一定浓度(CMC)下,表面活性剂分子之间存在显着的相互作用。具有较高烃链的表面活性剂比较低烃链的表面活性剂具有06 kJ / mol和更高的热稳定性。从电导率,密度和粘度以及表面张力测量中收集的信息表明,一定浓度(CMC)的表面活性剂分子之间存在显着的相互作用。

更新日期:2020-04-03
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