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Journal Article
Highly Contrastive, Real-time Modulation of Light Intensity by Reversible Stress-whitening of Spontaneously Formed Nanocomposites: Application to Wearable Strain Sensors
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- Authors
- Seung Koo Park, Sungryul Yun, Geonwoo Hwang, Meejeong Choi, Dong Wook Kim, Jong-Moo Lee, Bong Je Park, Saekwang Nam, Heeju Mun, Seongcheol Mun, Jeong Mook Lim, Eun Jin Shin, Ki-Uk Kyung, Suntak Park
- Issue Date
- 2021-07
- Citation
- Journal of Materials Chemistry C, v.9, no.27, pp.8496-8505
- ISSN
- 2050-7526
- Publisher
- Royal Society of Chemistry (RSC)
- Language
- English
- Type
- Journal Article
- Abstract
- Stress-whitening is generally regarded as a sign of irreversible elasticity failure of polymer materials. Here, we report for the first time that in stark contrast to the conventional insight, the full range of stress-whitening occurs prior to a yield point and is even reversible, which can be applied to light intensity modulation. The reversibility of stress-whitening impeccably emerges in highly transparent nanocomposite films spontaneously formed during photocuring of poly(dimethylsiloxane-co-methylvinylsiloxane) solution intert-butyl acrylate without any addition of nanofillers. This phenomeon is enabled by ?쁢lastic cavitation?? at soft elastomer matrix-hard nanoparticle interfaces. The film transmittance is readily controllable fromca.80 to 0% under small strain (琯< 20%) due to a high population of the nanoparticles, high initial modulus difference and low compatibility between the matrix and particles. The ratio of transmittance change to strain is as high as 3.7-8.0 depending on the wavelength in the visible region. A highly sensitive wearable strain sensor is demonstrated as an application of the unprecedented phenomenon. Our optical strain sensor rapidly, repeatedly responds in transmittance and reflectance to strain of around 0-40% in accordance with human body motion. This work may initiate basic and technological research into various applications of the optically or electrically active element-free light intensity modulators which do not place limits on continuous shape-deformations.
- KSP Keywords
- Active Element, Elastomer matrix, Electrically active, Element-free, Full range, Highly transparent, Human body motion, Initial modulus, Intensity modulation(IM), Light intensity modulation, Modulation of light intensity