Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences , Beijing 100083, China.
Soft Matter Center and Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology , Beijing 100029, PR China.
ACS Appl Mater Interfaces. 2016 Dec 14;8(49):34080-34088. doi: 10.1021/acsami.6b10453. Epub 2016 Dec 2.
Interfacial properties including permeation, catalytic efficiency, Raman signal enhancement capabilities, and cell spreading efficiencies are important features that determine material functionality and applications. Here, we propose a facile method to adjust the above-mentioned properties by controlling the cross-linking degrees of multilayer using a photoactive molecule. After treating the cross-linked films in basic solutions, films with different cross-linking degrees presented varying residue thicknesses and film morphologies. As a result, these different films possessed distinct molecular loading and release characteristics. In addition, gold nanoparticles (AuNPs) of different morphological traits were generated by redox reactions coupled with diffusion within these films. The AuNP-polyelectrolyte obtained from the polyelectrolyte films of the medium cross-linking degrees displayed the highest catalytic efficiency and signal enhancement capabilities. Furthermore, cells responded to the variation of film cross-linking degrees, and on the films with the highest cross-linking degree, cells adhered with the highest speed. We expect this report to provide a general interfacial material engineering strategy for material designs.
界面性质包括渗透性、催化效率、拉曼信号增强能力和细胞扩散效率，这些都是决定材料功能和应用的重要特征。在这里，我们提出了一种通过控制使用光活性分子的多层交联度来调节上述性质的简便方法。在将交联膜处理在碱性溶液中后，具有不同交联度的膜呈现出不同的残余厚度和膜形态。因此，这些不同的膜具有不同的分子负载和释放特性。此外，通过在这些膜内发生的氧化还原反应和扩散，生成了具有不同形态特征的金纳米粒子（AuNPs）。从中性交联度的聚电解质膜获得的 AuNP-聚电解质表现出最高的催化效率和信号增强能力。此外，细胞对膜交联度的变化做出响应，并且在交联度最高的膜上，细胞以最快的速度黏附。我们期望本报告为界面材料工程策略提供一个通用的材料设计方案。
