材料科学
咖啡环效应
蒸发
化学工程
聚乙烯醇
胶体
光热治疗
沉积(地质)
图层(电子)
多孔性
毛细管作用
纳米技术
复合材料
工程类
古生物学
物理
热力学
生物
沉积物
作者
Yunjia Liu,Si Lin,Yaping Zhu,Xiaoying Gao,Zhipeng Wang,Shenghong Yang,Jian Liu
出处
期刊:Small
[Wiley]
日期:2023-03-03
卷期号:19 (22)
标识
DOI:10.1002/smll.202207822
摘要
Uniformly depositing a thin layer of functional constituents on porous foam is attractive to realize their concentrated interfacial application. Here, a simple but robust polyvinyl alcohol (PVA)-mediated evaporation drying strategy to achieve uniform surface deposition on melamine foam (MF) is introduced. Solutes can be accumulated homogeneously to the surface periphery of MF due to the enhanced coffee-ring effect of PVA and its stabilizing effect on various functional constituents, including molecules and colloidal particles. The deposition thickness is positively correlated with the feeding amounts of PVA but seems to be independent of drying temperature. 3D outward capillary flow driven by the combination of contact surface pinning and continual interfacial evaporation induces the forming of core-shell foams. The enhanced interfacial photothermal effect and solar desalination performance using PVA/polypyrrole-coated MF as a Janus solar evaporator are demonstrated.
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