Anisotropic and Reversible Deformation of Mesopores and Mesostructures in Silica-Based Films under Mechanical Stimuli toward Adaptive Optical Components
Anisotropic and Reversible Deformation of Mesopores and Mesostructures in Silica-Based Films under Mechanical Stimuli toward Adaptive Optical Components
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DOI：
10.1021/acsanm.9b00269
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发表时间：
2019-03
影响因子：
5.9
通讯作者：
K. Okada;Genki Asakura;Tatsuya Yamamoto;Yasuaki Tokudome;Masahide Takahashi
中科院分区：
文献类型：
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作者：
K. Okada;Genki Asakura;Tatsuya Yamamoto;Yasuaki Tokudome;Masahide Takahashi
研究了表面活性剂/二氧化硅杂化薄膜和介孔二氧化硅薄膜中介孔结构的变形。表面活性剂/二氧化硅杂化膜的介观结构由有机胶束和二氧化硅基质组成。胶束在介孔二氧化硅薄膜中被去除以离开介孔。掠入射小角X射线散射研究表明，在6%的压缩应变下，两种薄膜具有C2 mm对称性的介观结构发生各向异性变化，晶格参数沿压缩方向收缩，法向伸缩。在高达6%的应变下，变形是可逆的。细观结构的各向异性变形导致了沿压缩方向垂直和平行的折射率的各向异性变化。表面活性剂/二氧化硅杂化薄膜的压缩导致折射率降低。
Deformation of the mesostructures in surfactant/silica hybrid films and mesoporous silica films prepared on bulky elastomeric substrates is investigated by compressing the substrates along an in-plane direction of the films. The mesostructure in the surfactant/silica hybrid film consists of organized micelles and a silica matrix. The micelles are removed in the mesoporous silica films to leave mesopores. A grazing-incidence small-angle X-ray scattering investigation reveals that the mesostructures with C2mm symmetry anisotropically change under a compressive strain of 6% in both films; shrinkage of the lattice parameters is along the direction of compression and extension in the normal direction. Deformation is reversible below a strain as high as 6%. Anisotropic deformation of the mesostructures results in an anisotropic change of the refractive indices normal and parallel to the direction of the compression. Compression of the surfactant/silica hybrid film induces a decrease of the refractive index para...