Estimation of moisture diffusion coefficient in thin polymer films with piezoelectric quartz crystal resonators

1985 ◽  
Vol 23 (11) ◽  
pp. 583-586 ◽  
Author(s):  
Ruey M. Yang ◽  
Ho-Ming Tong
Keyword(s):  
Diffusion Coefficient ◽  
Polymer Films ◽  
Quartz Crystal ◽  
Moisture Diffusion ◽  
Thin Polymer Films ◽  
Piezoelectric Quartz ◽  
Moisture Diffusion Coefficient ◽  
Thin Polymer ◽  
Piezoelectric Quartz Crystal ◽  
Quartz Crystal Resonators

Luminescence measurements of oxygen permeation and oxygen diffusion in thin polymer films

1995 ◽  
Vol 73 (11) ◽  
pp. 2021-2029 ◽  
Author(s):  
Ahmad Yekta ◽  
Zahra Masoumi ◽  
Mitchell A. Winnik
Keyword(s):  
Diffusion Coefficient ◽  
Polymer Films ◽  
Emission Intensity ◽  
Luminescence Quenching ◽  
Polymeric Films ◽  
Thin Polymer Films ◽  
Molecular Diffusivity ◽  
Thin Polymer ◽  
Observed Behaviour ◽  
And Diffusion

A new method is developed for analyzing the diffusion of oxygen in thin polymer films via fluorescence quenching measurements. We begin by reviewing previous methods, all of which involve approximations, for the measurement of permeability and diffusion coefficient by luminescence quenching; their shortcomings are clarified. An exact analytic theory is developed that successfully couples Fick's laws of diffusion to the Stern–Volmer equation of intensity quenching. Various modes of experimentation with polymeric films are considered. The equations we derive make the unexpected prediction that the rate of emission intensity decay when O2 diffuses into a polymer film is much faster than the rate of emission intensity enhancement when O2 diffuses out of the same film, even when the molecular diffusivity remains unchanged. Experiments show that this is indeed the observed behaviour. Keywords: diffusion coefficient, oxygen permeability, polymers, quenching, luminescence quenching, Fick's laws. Stern–Volmer equation.

scholarly journals A practical guide to quartz crystal microbalance with dissipation monitoring of thin polymer films

2021 ◽  
Author(s):  
Alexandra D. Easley ◽  
Ting Ma ◽  
Chikaodinaka I. Eneh ◽  
Junyeong Yun ◽  
Ratul M. Thakur ◽  
...  
Keyword(s):  
Quartz Crystal Microbalance ◽  
Polymer Films ◽  
Quartz Crystal ◽  
Thin Polymer Films ◽  
Practical Guide ◽  
Thin Polymer
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