在空气-水界面上的两性pH响应异体移植瓶刷的虫球过渡
1Department of Chemistry, University of Tennessee, Knoxville, TN 37996, USA. bzhao@utk.edu.
Soft matter
|January 17, 2024
概括
响应pH的分子瓶刷 (MBB) 在空气-水接口上改变形状. 它们的形态取决于pH值和PDEAEMA侧链的数量,影响它们在压缩下的行为.
科学领域:
- 聚合物科学 聚合物科学
- 表面化学 表面化学
- 材料科学 材料科学 材料科学
背景情况:
- 用聚乙烯酸 (PBA) 和pH响应型聚二乙烯酸 (PDEAEMA) 的分子瓶刷 (MBB) 是有效的乳化剂.
- 这些MBB的界面行为和对刺激的反应尚不清楚.
研究的目的:
- 为了研究异种移植和同种移植的MBB在空气-水接口的形状变化的行为.
- 为了确定pH值和横向压缩对MBB形态的影响.
- 了解PDEAEMA内容在MBB接口响应中的作用.
主要方法:
- 利用Langmuir-Blodgett的来研究空气-水界面上的MBB.
- 采用原子力显微镜 (AFM) 来可视化MBB形状转换.
- 在受控的表面压力下变化的pH (4.0到10.0) 和PDEAEMA分子分数 (xPDEAEMA).
主要成果:
- 在pH 4.0下,MBBs的
PDEAEMA<0.50在压缩时表现出虫球体过渡,在更高的xPDEAEMA时连接性增加. - 具有xPDEAEMA=0.76的MBBs即使在pH4.0的高压缩下,由于静电排斥,也保持了形.
- 在pH 10.0下,MBBs与xPDEAEMA<0.50与pH 4.0相比,形状变化减少;对于xPDEAEMA>><0.50,没有过渡发生.
结论:
- 这项研究揭示了两性,pH响应的MBB在接口上的pH和组成依赖的形状变化行为.
- 来自质子化PDEAEMA链的静电排斥显著影响压缩下的MBB形态.
- 结果为设计用于接口应用的先进多组件MBB提供了洞察力.
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