Transport of Ions and Molecules in Biopolymeric Gels: Electroanalytical Studies.

Abstract

Transport of ions and molecules was studied in hydrogels of uncharged and anionic biopolymers, agarose and iota-carrageenan. Diffusion coefficients of neutral and ionic electroactive probes, the uncharged radical 2,2,6,6-tetramethyl-1-pipperidinyloxy, TEMPO, and Tl(I), were determined rapidly and precisely from steady-state transport-limited currents at platinum and mercury microelectrodes. Transport properties of both probes were studied in gels as effected by temperature, ionic strength and concentration of the biopolymer, and they were compared with those in solutions. The relation between macroscopic and local microscopic viscosity of biopolymeric gels was analyzed based on viscosity measurements and diffusion coefficient data.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jul 15, 1999
Accession Number
ADA366102

Entities

People

  • M. Ciszkowska
  • M. D. Guillaume
  • Richard T. Carlin

Organizations

  • Brooklyn College

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Biopolymers
  • Chemistry
  • Coefficients
  • Diffusion
  • Diffusion Coefficient
  • Electrodes
  • Equations
  • Measurement
  • Microelectrodes
  • Molecules
  • Physical Properties
  • Polymers
  • Polysaccharides
  • Steady State
  • Transition Temperature
  • Transport Properties
  • Viscosity

Fields of Study

  • Chemistry
  • Materials science

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Nanocomposite Materials Science