美国爱荷华州立大学Martin M. Thuo团队通过尺寸上限制有机金属加合物的聚合反应调节疏水性。相关研究成果于2021年2月18日发表在国际顶尖学术期刊《德国应用化学》。

在固体金属表面制备可调谐的精细织构，通常需要复杂的反应/处理系统。利用液态金属衍生的无机加合物的原位聚合和自组装（称为HetMet反应），伴随固化，可以容易地制备具有可调织构的固体金属膜。在过冷液态金属颗粒的预填充床中，作为自然尺寸限制，粒子间孔和毛细管粘附的薄液膜导致有机金属合成子的快速表面聚集，其容易齐聚并自组装成浓度决定的形态/图案。

调整颗粒大小、颗粒堆积（扁平或有纹理）和反应物浓度可在金属颗粒床上产生多种自主组织的有机金属结构。伴随着凝固和烧结的底层过冷颗粒床导致了多尺度图案化固体金属表面。研究人员通过在预组织的金属颗粒床上创建可调节的特征来说明这种尺寸受限聚合、耦合固化和烧结过程的有效性，并伴随可调节的润湿性，如所谓的花瓣和莲花效应。

附：英文原文

Title: Tunable Hydrophobicity via Dimensionally Confined Polymerization of Organometallic Adducts

Author: Julia J. Chang, Chuanshen Du, Alana Pauls, Martin M. Thuo

Issue&Volume: 2021-02-18

Abstract: Fabrication of tunable fine texture on solid metal surfaces, often demands sophisticated reaction/processing systems. Exploiting  in situ  polymerization and self‐assembly of inorganic adducts derived from liquid metals (so‐called HetMet reaction) with concomitant solidification, solid metal films with tunable texture are readily fabricated. Serving as natural dimensional confinement, interparticle pores and capillary adhered thin liquid films in a pre‐packed bed of undercooled liquid metal particles lead to expeditious surface accumulation of organometallic synthons, that readily oligomerize and self‐assemble into concentration‐dictated morphologies/patterns. Tuning particle size, particle packing (flat or textured), and reactant concentration generates diverse autonomously organized organometallic structures on a metal particle bed. Concomitant solidification and sintering of the underlying undercooled particle bed led to a multiscale patterned solid metal surface. We illustrate the effectiveness of this dimensionally restricted polymerization, coupled solidification and sintering process by creating tunable features on pre‐organized metal particle beds with concomitant tunable wettability as illustrated through the so‐called petal‐ and lotus‐ effects.

DOI: 10.1002/anie.202101795

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202101795