Mesoporous Silica Nanoparticles under Sintering Conditions: A Quantitative Study

详细信息    查看全文

• 作者：Fanny Silencieux ; Meryem Bouchoucha ; Olivier Mercier ; St茅phane Turgeon ; Pascale Chevallier ; Freddy Kleitz ; Marc-Andr茅 Fortin
• 刊名：Langmuir
• 出版年：2015
• 出版时间：December 1, 2015
• 年：2015
• 卷：31
• 期：47
• 页码：13011-13021
• 全文大小：602K
• ISSN：1520-5827

文摘

Thin films made of mesoporous silica nanoparticles (MSNs) are finding new applications in catalysis, optics, as well as in biomedicine. The fabrication of MSNs thin films requires a precise control over the deposition and sintering of MSNs on flat substrates. In this study, MSNs of narrow size distribution (150 nm) are synthesized, and then assembled onto flat silicon substrates, by means of a dip-coating process. Using concentrated MSN colloidal solutions (19.5 mg mL^鈥? SiO₂), withdrawal speed of 0.01 mm s^鈥?, and well-controlled atmospheric conditions (ambient temperature, 鈭?70% of relative humidity), monolayers are assembled under well-structured compact patterns. The thin films are sintered up to 900 掳C, and the evolution of the MSNs size distributions are compared to those of their pore volumes and densities. Particle size distributions of the sintered thin films were precisely fitted using a model specifically developed for asymmetric particle size distributions. With increasing temperature, there is first evidence of intraparticle reorganization/relaxation followed by intraparticle sintering followed by interparticle sintering. This study is the first to quantify the impact of sintering on MSNs assembled as thin films.