表面改性
共价键
材料科学
接触角
纳米颗粒
混合材料
化学工程
嫁接
胺气处理
组合化学
有机化学
化学
高分子化学
纳米技术
聚合物
复合材料
工程类
作者
Sara Fernanda Orsini,Laura Cipolla,Simona Petroni,Sandra Diré,Riccardo Ceccato,Emanuela Callone,Roberta Maria Bongiovanni,Sara Dalle Vacche,Barbara Di Credico,S Mostoni,Roberto Nisticò,L Raimondo,Roberto Scotti,Massimiliano D’Arienzo
出处
期刊:Langmuir
[American Chemical Society]
日期:2022-12-08
卷期号:38 (50): 15662-15671
被引量:1
标识
DOI:10.1021/acs.langmuir.2c02472
摘要
The present study reports on the synthesis of a new alkoxysilane-bearing light-responsive cinnamyl group and its application as a surface functionalization agent for the development of SiO2 nanoparticles (NPs) with photoreversible tails. In detail, cinnamic acid (CINN) was activated with N-hydroxysuccinimide (NHS) to obtain the corresponding NHS-ester (CINN-NHS). Subsequently, the amine group of 3-aminopropyltriethoxysilane (APTES) was acylated with CINN-NHS leading to the generation of a novel organosilane, CINN-APTES, which was then exploited for decorating SiO2 NPs. The covalent bond to the silica surface was confirmed by solid state NMR, whereas thermogravimetric analysis unveiled a functionalization degree much higher compared to that achieved by a conventional double-step post-grafting procedure. In light of these intriguing results, the strategy was successfully extended to naturally occurring sepiolite fibers, widely employed as fillers in technological applications. Finally, a preliminary proof of concept of the photoreversibility of the obtained SiO2@CINN-APTES system has been carried out through UV diffuse reflectance. The overall outcomes prove the consistency and the versatility of the methodological protocol adopted, which appears promising for the design of hybrid NPs to be employed as building blocks for photoresponsive materials with the ability to change their molecular structure and subsequent properties when exposed to different light stimuli.
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