Measurement of oxygen diffusion in PS/PNIPAM films using fluorescence quenching
Date
2015
Authors
Yargı, Önder
Pekcan, Önder
Uğur, Şaziye
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor & Francis Ltd
Open Access Color
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Abstract
The diffusion of oxygen into pyrene labelled polystyrene (PS) latex/poly(N-isopropylacrylamide) (PNIPAM) composite films (PS/PNIPAM) was studied based on PS content with the use of fluorescence quenching method. Fluorescence experiments were carried out on composite films containing pyrene as a sensor dye. The Stern-Volmer equation for fluorescence quenching is combined with Fick's law for diffusion to derive mathematical expressions. Diffusion coefficients (D) were produced and found to be decreased with increasing PS content. This decrease was explained with the formation of a tortuous path for diffusing gas molecules which extends the diffusion path of oxygen in the films. In addition at high PS content two different D values were obtained which were attributed to the existence of two different areas in the composite films.
Description
Keywords
PS latex, PNIPAM latex, Fluorescence, Quenching, Oxygen, Diffusion, Composites, Films
Turkish CoHE Thesis Center URL
Fields of Science
Citation
0
WoS Q
N/A
Scopus Q
Q3
Source
Volume
44
Issue
5
Start Page
189
End Page
196