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Visualization of Strain Using Elastomer-Immobilized Tunable Colloidal Photonic Crystal Films

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  • エラストマー固定チューナブルコロイドフォトニック結晶フィルムによるひずみの可視化
  • エラストマー コテイ チューナブルコロイドフォトニック ケッショウ フィルム ニ ヨル ヒズミ ノ カシカ

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Abstract

<p>Tunable colloidal photonic crystal films consisting of loosely packed colloidal crystals immobilized in elastomers were prepared. The prepared soft film was adhered to an aluminum specimen and the tensile testing was performed. Before applying the tensile force, the film exhibited red color due to Bragg reflection from (111) lattice planes of the face-centered cubic structure, which are parallel to the film surface. With increasing strain on the specimen, the Bragg wavelength of the colloidal crystals was blue-shifted, mainly owing to reduction of the lattice spacing. Consequently, the color of the film changed to orange, yellow, and green in accordance with increasing strain. The prepared films can be used as simple sensors that detect the strain on the materials to which they are adhered based on color change.</p>

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