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构建半透膜 一次一个单质:通过分子层沉积与界面聚合的结构优势
Brian C Welch1,2, Emma N Antonio2, Thomas P Chaney2
1Israel Institute of Technology, Haifa 3200003, Israel.
Chemistry of materials : a publication of the American Chemical Society
|February 19, 2024
概括
分子层沉积 (MLD) 为膜制造精确的纳米膜. 与传统方法相比,MLD制造的薄膜显示了更密集的结构和更好的盐排斥,为先进的膜技术提供了新的途径.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 纳米技术 纳米技术
背景情况:
- 分子层沉积 (MLD) 能够精确地进行聚合物纳米膜的层次合成.
- 接口聚合 (IP) 是一种常规方法,用于制造用于水处理的聚胺膜.
- 了解MLD合成膜的结构属性关系对于优化性能至关重要.
研究的目的:
- 将MLD制造的聚胺膜的结构,化学和形态特征与商业IP膜进行比较.
- 研究用于合成选择性层的MLD过程,用于海水淡化和纳米过.
- 为了阐明基于MLD的膜中的结构性能关系.
主要方法:
- 分子层沉积 (MLD) 用于合成使用N,N'-1,3-phenylenediamine (MPD) 和 piperazine (PIP) 与trimesoyl化物 (TMC) 的聚胺薄膜.
- 包括圆测量,X射线反射,X射线光电子光谱,红外光谱和放牧发作广角X射线散射在内的技术用于表征.
- 与使用常规界面聚合 (IP) 制造的膜进行了比较.
主要成果:
- 在115°C时,MLD产生了密集的,合规的聚胺薄膜,其增长速度受控 (MPD-TMC为2.9 Å/周期,PIP-TMC为1.5 Å/周期).
- 由于其密集的结构,MPD-TMC MLD 薄膜表现出增强的盐排斥和减少的流量,其稳定的生长温度窗口为115至150°C.
- 与MPD-TMC (3.8 Å) 相比,MLD PIP-TMC膜显示出一种疏水性散体结构,非常适合水流,具有独特的结构特征 (d-spacing为5.0 Å).
结论:
- MLD提供了一种精确的方法,用于制造水净化膜的密度高和规格高的聚胺纳米膜.
- 该MLD工艺允许量身定制的膜结构,从而改善性能特征,如盐排斥和水流.
- 这项研究为膜制造和结构性能关系的MLD提供了基础的见解.
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