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학술지 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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저자
박승구, 윤성률, 황건우, 최미정, 김동욱, 이종무, 박봉제, 남세광, 문희주, 문성철, 임정묵, 신은진, 경기욱, 박선택
발행일
202107
출처
Journal of Materials Chemistry C, v.9 no.27, pp.8496-8505
ISSN
2050-7526
출판사
Royal Society of Chemistry (RSC)
DOI
https://dx.doi.org/10.1039/d1tc00256b
협약과제
20ZS1200, 인간중심의 자율지능시스템 원천기술연구, 김도현
초록
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 제안 키워드
Active Element, Butyl acrylate(BA), Elastomer matrix, Electrically active, Element-free, Full range, Highly sensitive, Human body motion, Initial modulus, Light intensity modulation, Modulation of light intensity