Temperature-Induced Changes in Reversed-Phase Chromatographic Surfaces: C8 and C9 Polymeric Ligands

Abstract

The temperature-dependent polarity of polymeric C8 and C9 stationary phases, preconditioned with acetonitrile and then contacted with water, is studied using the fluorescence of sorbed pyrene as a probe. The fluorescence vibronic band ratio, sensitive to the polarity of the probe surroundings, shows a temperature-dependent hysteresis which is indistinguishable from the retention behavior of these materials. The stationary phase polarity decreases when passing through the hysteresis, which is consistent with the loss of conditioning solvent from the interface but inconsistent with an extended structure for the alkyl ligands. Solvent retention in the stationary phase and its temperature dependence appears to require local ordering of the polymer phase.

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Document Details

Document Type
Technical Report
Publication Date
Jul 15, 1988
Accession Number
ADA197443

Entities

People

  • J. M. Harris
  • J. W. Carr

Organizations

  • University of Utah

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Adsorption
  • Band Structures
  • Chemical Synthesis
  • Chemistry
  • Dermatologic Agents
  • Energy Bands
  • Liquid Chromatography
  • Liquids
  • Macromolecules
  • Materials
  • Measurement
  • Military Research
  • Molecules
  • New York
  • Organic Solvents
  • Polymers
  • Transition Temperature

Readers

  • Analytical Chemistry
  • Materials Science and Engineering.
  • Thermal Physics or Thermal Science.