In situ steady state fluorescence (SSF) technique to study drying of PAAm hydrogels made of various cross-linker contents


Evinguer G. A. , Aktas D. , Pekcan O.

CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION, vol.48, no.2, pp.600-605, 2009 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 48 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.1016/j.cep.2008.07.003
  • Title of Journal : CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
  • Page Numbers: pp.600-605

Abstract

Drying experiments of polyacrylamide (PAAm) gels were performed using steady-state fluorescence (SSF) spectrometer. Pyranine (P) was introduced as a fluorescence probe and intensity of P from various crosslinker content gel samples was monitored. It was observed that the intensity of P increased during the in situ drying processes. Gravimetrical and volumetric experiments were also performed. An empirical model was derived and introduced to determine the desorption coefficient, D of water molecules from the drying PAAm gels. It is observed that D increased as the cross-linker content was increased. (c) 2008 Elsevier B.V. All rights reserved.