Dynamic Light Scattering Analysis on Critical Behavior of Cluster Size Distribution of Polyacrylamide and Agarose Solutions near the Sol-Gel Transition Point

Tomoyuki Fujii, Toshimasa Yano, Hitoshi Kumagai, Osato Miyawaki

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The dynamic light scattering (DLS) method was applied to measure the cluster radii of polyacrylamide and agarose solutions near the sol-gel transition point. In the case of polyacrylamide, primary clusters were formed first and secondary clusters on a larger scale were sequentially formed in the progress of the polymerization process. The z- average radius of the secondary cluster near the sol-gel transition point increased divergently with an increase in acryiamide concentration to the transition point By fitting the data with the scaling law, the sol-gel transition concentration and the critical exponent were determined to be 1.53% and 0.84, respectively. The z-average radius of the agarose cluster also showed a tendency to diverge with an increase in concentration to the sol-gel transition point. With fitting by the scaling law, the sol-gel transition concentration and the critical exponent of the agarose solution were determined to be 4.5×10-2% and 0.92, respectively, at 27.0°C. Thus, the percolation theory was proved to be effective to describe the cluster size distributions near the sol-gel transition point for both polyacrylamide and agarose solutions.

Original languageEnglish
Pages (from-to)94-98
Number of pages5
JournalFood Science and Technology Research
Volume6
Issue number2
DOIs
Publication statusPublished - 2000 May
Externally publishedYes

Keywords

  • Agarose
  • Correlation length
  • Critical exponent
  • Dynamic light scattering
  • Percolation

ASJC Scopus subject areas

  • Biotechnology
  • Food Science
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering
  • Marketing

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