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Colloid and Polymer Science
Erschienen in: Colloid and Polymer Science 12/2016

06.10.2016 | Original Contribution

Temperature-driven volume phase transition of a single stimuli-responsive microgel particle using optical tweezers

verfasst von: Deepak K. Gupta, D. Karthickeyan, B. V. R. Tata, T. R. Ravindran

Erschienen in: Colloid and Polymer Science | Ausgabe 12/2016

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Abstract

Poly(N-isopropylacrylamide) (PNIPAM)-based microgels respond to temperature and exhibits a transition from swollen to deswollen state upon variation of temperature, which is known as volume phase transition (VPT). Dynamic light scattering (DLS) is a popular technique to identify the volume phase transition temperature (VPTT) of microgel particles, which measures variation of particle size with temperature in a suspension having microgel particle concentration of 107–108 particles/cm3. Here, we employ optical tweezers to trap a single microgel particle and identify its VPTT by measuring the lateral trap stiffness, κ as a function temperature. It is shown that near the VPTT, κ increases gradually upon increasing temperature, which is due to a gradual decrease in particle size with simultaneous increase in its refractive index.
Vorheriger Artikel The interaction between poly(ε-caprolactone) copolymers containing sulfobetaines and proteins
Nächster Artikel Poly(L-lysine)-based cylindrical copolypeptide brushes as potential drug and gene carriers

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Metadaten
Titel
Temperature-driven volume phase transition of a single stimuli-responsive microgel particle using optical tweezers
verfasst von
Deepak K. Gupta
D. Karthickeyan
B. V. R. Tata
T. R. Ravindran
Publikationsdatum
06.10.2016
Verlag
Springer Berlin Heidelberg
Erschienen in
Colloid and Polymer Science / Ausgabe 12/2016
Print ISSN: 0303-402X
Elektronische ISSN: 1435-1536
DOI
https://doi.org/10.1007/s00396-016-3952-1

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