Temperature dependence of electrophoretic mobility and hydrodynamic radius of microgels of poly(N-isopropylacrylamide)

Yasuyuki Maki, Kentaro Sugawara, Daisuke Nagai

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Electrostatic interactions in charged microgels, which are dominated by the microgel net charge, play a crucial role in colloidal stabilization and loading of small, charged molecules. In this study, the temperature dependences of electrophoretic mobility µ and hydrodynamic radius Rh were measured for a slightly ionized poly(N-isopropylacrylamide) (PNIPA) microgel in a dilute suspension. A decrease in Rh was observed in the temperature range between 30 C and 35 C, corresponding to the lower critical solution temperature of PNIPA, and an increase in |µ| was observed in a higher temperature range between 34 C and 37 C. The analysis based on electrophoresis theory for spherical polyelectrolytes indicated that the net charge of the microgel decreased as the microgel was deswollen.

Original languageEnglish
Article number37
JournalGels
Volume4
Issue number2
DOIs
Publication statusPublished - Jun 2018

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Biomaterials
  • Organic Chemistry
  • Polymers and Plastics

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