润湿
介孔二氧化硅
材料科学
介孔材料
化学工程
毛细管冷凝
收缩率
纳米颗粒
傅里叶变换红外光谱
硅氧烷
纳米技术
复合材料
化学
有机化学
催化作用
吸附
聚合物
工程类
作者
Yao Sun,Hiroaki Sai,Katherine A. Spoth,Kwan Wee Tan,Ulrike Werner‐Zwanziger,Josef W. Zwanziger,Sol M. Grüner,Lena F. Kourkoutis,Ulrich Wiesner
出处
期刊:Nano Letters
[American Chemical Society]
日期:2015-12-15
卷期号:16 (1): 651-655
被引量:26
标识
DOI:10.1021/acs.nanolett.5b04395
摘要
Stimuli-responsive materials have attracted great interest in catalysis, sensing, and drug delivery applications and are typically constituted by soft components. We present a one-pot synthetic method for a type of inorganic silica-based shape change material that is responsive to water vapor exposure. After the wetting treatment, the cross-sectional shape of aminated mesoporous silica nanoparticles (MSNs) with hexagonal pore lattice changed from hexagonal to six-angle-star, accompanied by the loss of periodic mesostructural order. Nitrogen sorption measurements suggested that the wetting treatment induced a shrinkage of mesopores resulting in a broad size distribution and decreased mesopore volume. Solid-state 29Si nuclear magnetic resonance (NMR) spectroscopy of samples after wetting treatment displayed a higher degree of silica condensation, indicating that the shape change was associated with the formation of more siloxane bonds within the silica matrix. On the basis of material characterization results, a mechanism for the observed anisotropic shrinkage is suggested based on a buckling deformation induced by capillary forces in the presence of a threshold amount of water vapor available beyond a humidity of about 50%. The work presented here may open a path toward novel stimuli-responsive materials based on inorganic components.
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