Bile-salt-induced aggregation of poly(N-isopropylacrylamide) and lowering of the lower critical solution temperature in aqueous solutions

Anitha C. Kumar, Harikrishna Erothu, Himadri B. Bohidar, Ashok K. Mishra

Research output: Contribution to journalArticle

Abstract

The effect of sodium cholate (NaC; concentration 1-16 mM), a biological surfactant, on the aggregation behavior of 1% (w/v, 2.2 × 10(-3) M) poly(N-isopropylacrylamide) (PNIPAM) aqueous solutions was studied as a function of temperature. From turbidity, dynamic light scattering, viscosity, and fluorescence measurements, it was observed that (i) there is NaC-induced nanoscale aggregation of PNIPAM in its sol state and (ii) the lower critical solution temperature corresponding to sol-gel transition shifts to a lower temperature by about 2 °C.
Original languageEnglish
Pages (from-to)433-439
Number of pages7
JournalJournal of Physical Chemistry: Part B
Volume115
Issue number3
DOIs
Publication statusPublished - 3 Dec 2011

Keywords

  • sodium cholate
  • aggregation behavior

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