合成和化碳烯硫酸盐表面活性剂与短链的基链
Jinglin Tan1, Jiangbin Xie1, Yue-Fei Zhang1
1Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, China.
Langmuir : the ACS journal of surfaces and colloids
|November 1, 2023
概括
这项研究准备了具有不同短链长度的新型碳烯硫酸盐表面活性剂. 较短的基链增强了表面活性剂的吸附和菌形成,由低温时的和高温时的驱动.
科学领域:
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
- 体科学 体科学 体科学
背景情况:
- 碳烯表面活性剂是表面活性剂的一类,其特点是碳烯的疏水性组与水友性部分联系在一起.
- 了解表面活性剂结构和自我组装行为之间的关系对于开发先进材料至关重要.
- 基链长度对基表面活性剂的特性的影响仍然是积极研究的领域.
研究的目的:
- 合成和描述一系列具有短链 (C-Si2C-SO3Na,n=1-6) 的碳酸盐硫酸表面活性剂.
- 研究基链长度对这些新型表面活性剂的化行为和空气/水界面吸附的影响.
- 阐明控制化过程的热力学驱动力.
主要方法:
- 使用SiNMR,HNMR和FT-IR光谱学合成和表征碳烯硫酸盐表面活性剂.
- 通过表面张力,动态光散射,导电性和传导电子显微镜评估化特性.
- 使用温度依赖的测量方法对化进行热力学分析.
主要成果:
- 临界微粒度 (CMC) 随着基链长度的增加而下降.
- 在CMC (γCMC) 的表面张力最初从甲基增加到基链,然后从基减少到基链.
- 表面活性物在空气/水界面呈现出橄球形状,最小面积 (Amin) 随着链长度的增加而增加.
- 微化在低温下是以驱动的,在高温下是以驱动的,对于较长的链条,越来越多的负 ΔHm和正 ΔSm值.
- 聚合物的水力动力直径 (Dh) 随着基链长度的增加而减少.
结论:
- 刚性四甲基二碳烯基组和短链之间的协同相互作用决定了表面活性剂的吸附和菌形成.
- 基链长度是控制这些碳酸硫酸盐表面活性剂的自我组装行为和界面特性的一个关键因素.
- 观察到的热力学趋势为化机制和各种领域的潜在应用提供了洞察力.
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