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Reversible thermochromic fibers with excellent elasticity and hydrophobicity for wearable temperature sensors

热致变色 材料科学 可穿戴计算机 复合材料 弹性(物理) 化学工程 计算机科学 化学 有机化学 嵌入式系统 工程类
作者
Taekyung Lim,Hee Sung Seo,Jonguk Yang,Keun‐Hyeok Yang,Sanghyun Ju,Sang‐Mi Jeong
出处
期刊:RSC Advances [Royal Society of Chemistry]
卷期号:14 (9): 6156-6164 被引量:4
标识
DOI:10.1039/d3ra06432h
摘要

Color-changing fibers, which can intuitively convey information to the human eye, can be used to facilely add functionality to various types of clothing. However, they are often expensive and complex, and can suffer from low durability. Therefore, in this study, we developed highly elastic and hydrophobic thermochromic fibers as wearable temperature sensors using a simple method that does not require an electric current. A thermochromic pigment was embedded inside and outside hydrophobic silica aerogel particles, following which the thermochromic aerogel was fixed to highly elastic spandex fibers using polydimethylsiloxane as a flexible binder. In particular, multi-strand spandex fibers were used instead of single strands, resulting in the thermochromic aerogels penetrating the inside of the strands upon their expansion by solvent swelling. During drying, the thermochromic aerogel adhered more tightly to the fibers by compressing the strands. The thermochromic fiber was purple at room temperature (25 °C), but exhibited a two-stage color change to blue and then white as the temperature increased to 37 °C. In addition, even after 100 cycles of tension-contraction at 200%, the thermochromic aerogel did not detach and was strongly attached to the fiber. Additionally, it was confirmed that color change due to temperature was stable even after exposure to 1 wt% NaCl (artificial sweat) and 0.1 wt% detergent solutions. The developed thermochromic fiber therefore exhibited excellent elasticity and hydrophobicity, and is expected to be widely utilized as an economical wearable temperature sensor as it does not require electrical devices.
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