分子自组装单层膜的表面浸润性研究现状和展望

Status and Prospect of Surface Wettability of Molecular Self-assembled Monolayers

立足于分子自组装单层膜的制备及结构,讨论了分子自组装单层膜的头基基团与基底的作用机理、主链与环境的温度依赖关系,特别是其端基基团的化学性质及构象对表面浸润行为的影响.重点讨论了分子自组装单层膜的端甲基基团对表面能的贡献、极性端基基团与水分子之间的相互作用以及自组装单层膜表面的分子尺寸粗糙度对表面浸润的影响.最后,基于理论和实验基础对以上问题提出新的认知与看法,并对未来该领域发展的机遇与挑战进行了展望.

This article aims to revisit the research of surface wetting on self-assembled monolayers(SAMs)of organic molecules.It starts with a brief overview of the growth mechanism governing the self-assembly of organic molecules,followed by discussion of temperature-induced phase transition of SAMs.In the following sections,the surface wettability of SAMs is discussed in three main aspects on the basis of a collection of studies reported in a time span of 100 years,including(1)the contribution of terminal methyl groups to total surface energy of SAMs;(2)manifestation of the interactions between terminal polar groups and their interactions with water in SAM surface wettability,and the newly-discovered effect of molecular-level roughness of SAMs on their surface wettability.These studies will be put in new prospective in order to shift conventional thermodynamic description of surface wetting phenomena to new molecular-level interpretation and design of surface wettability.