Infrared optical properties and AFM of spin-cast chitosan films chemically modified with 1,2 Epoxy-3-phenoxy-propane

W. H. Nosal, D. W. Thompson, L. Yan, S. Sarkar, Anuradha Subramanian, John A Woollam

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Chemical modification of spin-cast chitosan films has been performed. This modification involves the attachment of 1,2 Epoxy-3-phenoxy-propane, commonly known as glycidyl phenyl ether (GPE), to the amine group of the chitosan molecule. Optical properties of modified films have been determined in the infrared region of the spectrum using spectroscopic ellipsometry, and are reported in this paper. Special attention is paid to the infrared region where the index of refraction and extinction coefficients from 750 to 4000 cm -1 were determined. Difference plots of IR optical data before and after chemical modification were generated to confirm that modification had occurred. Optical modeling of infrared spectroscopic ellipsometry (IRSE) data with respect to chemical bond vibrations has also been performed. This modeling involved curve fitting of resonant chemical bond absorptions using Lorentz oscillators. These oscillator models allow for comparison of modified chitosan to unmodified chitosan. The purpose of this research was to determine infrared optical constants of chemically modified chitosan films This work shows that surface chemistry of biomaterials can be studied quite sensitively with spectroscopy ellipsometry, detecting as little as 100 ng/cm2 of GPE.

Original languageEnglish (US)
Pages (from-to)26-31
Number of pages6
JournalColloids and Surfaces B: Biointerfaces
Volume46
Issue number1
DOIs
StatePublished - Nov 25 2005

Fingerprint

Propane
Chitosan
propane
casts
Optical properties
atomic force microscopy
ellipsometry
Infrared radiation
optical properties
chemical bonds
Spectroscopic ellipsometry
Chemical bonds
Chemical modification
ethers
oscillators
Ethers
curve fitting
Light extinction
Optical constants
attachment

Keywords

  • AFM
  • Chitin/chitosan
  • Ellipsometry
  • Infrared spectrum
  • Surface chemical modification

ASJC Scopus subject areas

  • Biotechnology
  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Infrared optical properties and AFM of spin-cast chitosan films chemically modified with 1,2 Epoxy-3-phenoxy-propane. / Nosal, W. H.; Thompson, D. W.; Yan, L.; Sarkar, S.; Subramanian, Anuradha; Woollam, John A.

In: Colloids and Surfaces B: Biointerfaces, Vol. 46, No. 1, 25.11.2005, p. 26-31.

Research output: Contribution to journalArticle

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abstract = "Chemical modification of spin-cast chitosan films has been performed. This modification involves the attachment of 1,2 Epoxy-3-phenoxy-propane, commonly known as glycidyl phenyl ether (GPE), to the amine group of the chitosan molecule. Optical properties of modified films have been determined in the infrared region of the spectrum using spectroscopic ellipsometry, and are reported in this paper. Special attention is paid to the infrared region where the index of refraction and extinction coefficients from 750 to 4000 cm -1 were determined. Difference plots of IR optical data before and after chemical modification were generated to confirm that modification had occurred. Optical modeling of infrared spectroscopic ellipsometry (IRSE) data with respect to chemical bond vibrations has also been performed. This modeling involved curve fitting of resonant chemical bond absorptions using Lorentz oscillators. These oscillator models allow for comparison of modified chitosan to unmodified chitosan. The purpose of this research was to determine infrared optical constants of chemically modified chitosan films This work shows that surface chemistry of biomaterials can be studied quite sensitively with spectroscopy ellipsometry, detecting as little as 100 ng/cm2 of GPE.",
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