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Raman microspectroscopic study on an optically formed poly(N-isopropylacrylamide) rich microparticle: molecular weight dependence of a polymer concentration in the particle
Author(s): Kayo Fujiwara; Tatsuya Shoji; Mitsuhiro Matsumoto; Taka-Aki Asoh; Takashi Nishiyama; Hideo Horibe; Yasuyuki Tsuboi
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Paper 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.

Paper Details

Date Published: 24 April 2018
PDF: 3 pages
Proc. SPIE 10712, Optical Manipulation Conference, 107121X (24 April 2018); doi: 10.1117/12.2319560
Show Author Affiliations
Kayo Fujiwara, Osaka City Univ. (Japan)
Tatsuya Shoji, Osaka City Univ. (Japan)
Mitsuhiro Matsumoto, Osaka City Univ. (Japan)
Taka-Aki Asoh, Osaka City Univ. (Japan)
Takashi Nishiyama, Osaka City Univ. (Japan)
Hideo Horibe, Osaka City Univ. (Japan)
Yasuyuki Tsuboi, Osaka City Univ. (Japan)


Published in SPIE Proceedings Vol. 10712:
Optical Manipulation Conference
Takashige Omatsu; Hajime Ishihara; Keiji Sasaki, Editor(s)

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