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Color-changing and light-emitting smart textiles with dual thermal response

Time : 2019-12-09 Hits : 18

Relative to the electricity, pH value, chemical stimulation, such as thermal stimulation are easier to implement in our daily life, so the thermal response type material in the smart textiles, anti-counterfeiting, sensing, and many other fields has been widely concerned, thermal response refers to the type of material with the external environment temperature change and change its physical properties of materials, including thermal discoloration on research in the field of smart textiles is most a kind of material.


However, thermochromic materials have certain environmental limitations. For example, it is not easy to observe the color change of materials in the dark environment, which results in great limitations in practical applications. Therefore, it is urgent to develop a material with both thermochromic and thermofluorescent properties to further expand its application range.

Recently, in collaboration with Texas A&M university, jiangnan university has developed a thermally responsive material with dual functions of thermochromism and thermofluorescence. The material is a composite nanoparticle dye, which is a purple powdery dye obtained by condensation of tetraethyl orthosilicate and then coating the silica gel nanoparticles with diindoles and quinacridones (IQA) organic dye molecules and fatty alcohols.


The dye can be dyed on the polyester fabric by conventional dyeing method, and the dyed polyester fabric retains the properties of the original nanocomposite material, which can realize the dual changes of color and fluorescence performance with the change of ambient temperature.


Properties of composite nanoparticles

The results showed that the dyed fabric showed clear color change and high contrast fluorescence state change in real time and highly reversible manner. After heating, the fabric color changes from deep purple to orange under visible light. Under uv light (365 nm), the fabric changes from a dull non-fluorescent state to a strong golden fluorescent state.


Color changes of dyed fabrics at different temperatures


Fluorescence changes of dyed fabrics at different temperatures

The thermochromic mechanism of the material is the adjustable dissociation or aggregation mechanism of IQA molecules in a fatty alcohol solvent. Since the dissociation and aggregation of IQA molecules depend directly on the melting and solidification of the solvent. Therefore, the discoloration temperature can be controlled by changing the solvent component.

This study provides a new idea for designing multi-functional thermal response intelligent textiles. Related research results were published in Advanced Functional Materials under the title of "high-performance Thermoresponsive dual-output Dye System for Smart Textile Application".

(official account of textile herald)

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