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

Fingerprint

Bile Acids and Salts
Agglomeration
Salts
aqueous solutions
salts
turbidity
Sodium Cholate
light scattering
surfactants
sodium
gels
Polymethyl Methacrylate
Dynamic light scattering
Turbidity
viscosity
Sols
Surface-Active Agents
fluorescence
Temperature
Sol-gels

Keywords

  • sodium cholate
  • aggregation behavior

Cite this

Kumar, Anitha C. ; Erothu, Harikrishna ; Bohidar, Himadri B. ; Mishra, Ashok K. / Bile-salt-induced aggregation of poly(N-isopropylacrylamide) and lowering of the lower critical solution temperature in aqueous solutions. In: Journal of Physical Chemistry: Part B. 2011 ; Vol. 115, No. 3. pp. 433-439.
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Bile-salt-induced aggregation of poly(N-isopropylacrylamide) and lowering of the lower critical solution temperature in aqueous solutions. / Kumar, Anitha C.; Erothu, Harikrishna; Bohidar, Himadri B.; Mishra, Ashok K.

In: Journal of Physical Chemistry: Part B, Vol. 115, No. 3, 03.12.2011, p. 433-439.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Bile-salt-induced aggregation of poly(N-isopropylacrylamide) and lowering of the lower critical solution temperature in aqueous solutions

AU - Kumar, Anitha C.

AU - Erothu, Harikrishna

AU - Bohidar, Himadri B.

AU - Mishra, Ashok K.

PY - 2011/12/3

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AB - 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.

KW - sodium cholate

KW - aggregation behavior

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