Optimization of Low Temperature Vitrification for Surface Analysis of Hydrated Hydrogel Polymers.

Abstract

A method for analyzing hydrated hydrogel polymer surfaces in ultra-high vacuum atmospheres has been developed. The materials used for this study were commercially available poly(2-hydroxyethylmethacrylate) (HEMA) based hydrogel polymer ("soft") contact lenses. Application of a temperature controlled sample handling attachment for maintaining liquid nitrogen temperature samples is discussed. Issues such as ample handling, sample preparation, X-ray damage, have been investigated and controlled. Compared to a hydrated surface, specific surface enrichments of various components such as poly(dimethylsiloxane) and poly(N-vinylpyrrolidone) on the dehydrated surface are detected. This is likely due to surface energetics and differences in hydrophobicity/hydrophilicity of the components. jg p.1

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1994
Accession Number
ADA296513

Entities

People

  • George L. Grobe Iii
  • Joseph A. Gardella Jr.
  • Patrick C. Schamberger
  • Paul L. Valint Jr

Organizations

  • University at Buffalo

Tags

Communities of Interest

  • Biomedical
  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Alkenes
  • Chemistry
  • Contact Lenses
  • Elements
  • Glass Transition Temperature
  • Hydrocarbons
  • Low Temperature
  • Mass Spectrometry
  • Materials
  • Spectra
  • Spectrometry
  • Spectroscopy
  • Surface Analysis
  • Transition Temperature
  • Vitreous State
  • Vitrification
  • X Rays

Fields of Study

  • Chemistry

Readers

  • Analytical Chemistry
  • Nanocomposite Materials Science
  • Thin Film Deposition Science.