Raman microspectroscopic study on an optically formed poly(N-isopropylacrylamide) rich microparticle: molecular weight dependence of a polymer concentration in the particle

Kayo Fujiwara; Tatsuya Shoji; Mitsuhiro Matsumoto; Taka-Aki Asoh; Takashi Nishiyama; Hideo Horibe; Yasuyuki Tsuboi

doi:10.1117/12.2319560

24 April 2018 Raman microspectroscopic study on an optically formed poly(N-isopropylacrylamide) rich microparticle: molecular weight dependence of a polymer concentration in the particle

Kayo Fujiwara, Tatsuya Shoji, Mitsuhiro Matsumoto, Taka-Aki Asoh, Takashi Nishiyama, Hideo Horibe, Yasuyuki Tsuboi

Author Affiliations +

Proceedings Volume 10712, Optical Manipulation Conference; 107121X (2018) https://doi.org/10.1117/12.2319560
Event: SPIE Structured Light, 2018, Yokohama, Japan

Abstract

Poly(N-isopropylacrylamide) solution, which is a representative thermoresponsive polymer, exhibits a phase separation with a formation of polymer-rich microparticles due to dehydration and aggregation of the polymer chains above a lower critical solution temperature (LCST). However, little is known about the details of polymer concentration in the particle. We have developed optical tweezers combined with confocal Raman microspectroscopy to analyze a hydration structure in a single polymer rich particle. A focused near-infrared laser beam produced the microparticle at the focal point due to an optical force and a photothermal effect. In this study, we investigated that molecular weight dependence of the polymer concentration in the polymer-rich particle by means of Raman microspectroscopy.

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Kayo Fujiwara, Tatsuya Shoji, Mitsuhiro Matsumoto, Taka-Aki Asoh, Takashi Nishiyama, Hideo Horibe, and Yasuyuki Tsuboi "Raman microspectroscopic study on an optically formed poly(N-isopropylacrylamide) rich microparticle: molecular weight dependence of a polymer concentration in the particle", Proc. SPIE 10712, Optical Manipulation Conference, 107121X (24 April 2018); https://doi.org/10.1117/12.2319560

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