Macroporous temperature-sensitive gels with fast response: Comparison of preparation methods

Aleksey D. Drozdov, Jesper deClaville Christiansen

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Application of thermo-responsive gels as soft actuators for microfluidic devices with repeating “open–close” cycles requires high rates of water transport driven by changes in temperature. These rates are conventionally evaluated by comparison of water retention curves in T-jump tests with fixed initial and final temperatures. A shortcoming of this method is that it does not allow changes in diffusivity with temperature to be assessed quantitatively. To characterize cooperative diffusivity of water molecules, we propose a novel approach based on modeling the responses of temperature-sensitive gels in equilibrium swelling tests and T-jump experiments. Analysis of observations on poly(N-isopropylacrylamide) gels synthesized in aqueous solutions of pore-forming agents reveals that formation of a macroporous structure in a gel is a necessary, but not sufficient condition for acceleration of water transport. The effect of cosolvents used under preparation (phenol, ethanol, methanol, diethyl ether, dioxane, sucrose, and dodecyl dimethyl benzyl ammonium bromide) on water diffusivity is studied in detail. It is shown that the most pronounced enhancement of diffusivities under deswelling and reswelling is reached when the gels are synthesized in aqueous solutions of the surfactant at subzero temperatures.

Original languageEnglish
Article number46353
JournalJournal of Applied Polymer Science
Volume135
Issue number23
DOIs
StatePublished - 15 Jun 2018
Externally publishedYes

Keywords

  • gels
  • phase behavior
  • sensors and actuators
  • swelling
  • theory and modeling

ASJC Scopus subject areas

  • Chemistry (all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Macroporous temperature-sensitive gels with fast response: Comparison of preparation methods'. Together they form a unique fingerprint.

Cite this