Interfacial properties, and micellization of surface-active ionic liquid in presence of polymeric solutions

IF 2.218 Q2 Chemistry

Chemical Data Collections Pub Date : 2024-10-26 DOI:10.1016/j.cdc.2024.101168

Rajat Sinhmar, Vickramjeet Singh

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引用次数: 0

Abstract

Interfacial properties of newly synthesized surface-active ionic liquid 1-tetradecyl-3-methylimidazolium bromide [C₁₄mim]Br were studied in aqueous solutions of non-ionic polymeric co-solute polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG-200). The interfacial and micellization properties of [C₁₄mim]Br were determined considering various concentrations of PVP and PEG. The critical micelle concentration (CMC) was evaluated using conductivity, contact angle, and surface tension measurements. Thermodynamic properties such as standard enthalpy of micellization, ΔH°_m, standard Gibb's free energy of micellization, ΔG°_m, and standard entropy of micellization ΔS°_m, calculated from micellization and degree of counterion binding (α) values. As the concentration of PEG-200 polymer increased from 1 wt% to 2 wt%, the CMC of SAIL decreased, but CMC increased with temperatures. However, in the case of PVP polymer, the CMC values increased with PVP concentration and temperature. This observation illustrates how the electrostatic and hydrophobic interactions of SAIL with polymers (PEG-200 and PVP) influence SAIL micellization. From the surface tension measurements, CMC, surface tension at CMC (γ_cmc), surface excess concentration (Г_max), surface pressure (π_cmc), and minimum surface area per molecule (A_min) have also been evaluated in water and the presence of polymers (PEG-200 and PVP).

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表面活性离子液体在聚合物溶液存在下的界面特性和胶束化

研究了新合成的表面活性离子液体 1-十四烷基-3-甲基溴化咪唑鎓[C14mim]Br 在非离子聚合物共溶物聚乙烯吡咯烷酮（PVP）和聚乙二醇（PEG-200）水溶液中的界面特性。考虑到 PVP 和 PEG 的不同浓度，测定了 [C14mim]Br 的界面和胶束化特性。使用电导率、接触角和表面张力测量法评估了临界胶束浓度（CMC）。热力学性质，如胶束化标准焓 ΔH°m、胶束化标准吉布斯自由能 ΔG°m、胶束化标准熵 ΔS°m，由胶束化值和反离子结合度 (α)计算得出。随着 PEG-200 聚合物浓度从 1 wt% 增加到 2 wt%，SAIL 的 CMC 下降，但 CMC 随温度升高而增加。然而，对于 PVP 聚合物，CMC 值随着 PVP 浓度和温度的升高而升高。这一观察结果说明了 SAIL 与聚合物（PEG-200 和 PVP）之间的静电和疏水相互作用如何影响 SAIL 的胶束化。根据表面张力测量结果，还评估了在水中和聚合物（PEG-200 和 PVP）存在时的 CMC、CMC 时的表面张力 (γcmc)、表面过剩浓度 (Гmax)、表面压力 (πcmc) 和每个分子的最小表面积 (Amin)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Data Collections Chemistry-Chemistry (all)

CiteScore

6.10

自引率

0.00%

发文量

169

审稿时长

24 days

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