Electrochemical Sensors Based on Polymer Films Immobilized by Gamma Irradiation

1989 ◽  
pp. 78-95 ◽  
Author(s):  
Louis A. Coury ◽  
Christos Galiatsatos ◽  
Edward W. Huber ◽  
Sandra Sponaugle ◽  
William R. Heineman
Keyword(s):  
Gamma Irradiation ◽  
Polymer Films ◽  
Electrochemical Sensors

Plasma-deposited polymer films. III. The effects of gamma irradiation

1978 ◽  
Vol 22 (10) ◽  
pp. 2805-2816 ◽  
Author(s):  
W. F. Oberbeck ◽  
K. G. Mayhan ◽  
W. J. James
Keyword(s):  
Gamma Irradiation ◽  
Polymer Films

scholarly journals Structural and Optical Investigations of Radiation Damage in Transparent PET Polymer Films

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Shiv Govind Prasad ◽  
Abhijit De ◽  
Udayan De
Keyword(s):  
Free Radicals ◽  
Gamma Irradiation ◽  
Polymer Films ◽  
Wavelength Region ◽  
Xrd Analysis ◽  
High Dose ◽  
Plane Vibration ◽  
Bending Mode ◽  
Vis Spectroscopy ◽  
Gamma Irradiated

Effects of gamma irradiation at different doses up to 135 kGy on polyethylene terephthalate (PET) polymer films have been investigated by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and ultraviolet-visible (UV-VIS) spectroscopy. From XRD analysis, it was found that even at a high dose of gamma irradiation of 135 kGy, crystallinity of the PET samples remain unchanged. However, the FTIR peak at 871 cm−1 (depicting C–H bending mode of out-of-plane vibration) and another at 1303 cm−1 (representing C–H bending mode of in-plane vibration) disappear for gamma-irradiated PET. In this study, it has also been found that γ-irradiation in air enhances the optical absorption in the wavelength region 320–370 nm. This has been attributed to free radicals being produced in the polymer by the γ-radiation. Further, the free radicals react with oxygen of air to form carbonyl group and hydroxyls. With increasing γ-dose, there is a red shift of the UV—near visible cutoff for PET. XRD and FTIR observations on γ-damage have been correlated.

Gum arabic helps prepare better lacey polymer films for specimen support in electron microscopy

1993 ◽  
Vol 51 ◽  
pp. 240-241
Author(s):  
Shailesh R. Sheth ◽  
Jayesh R. Bellare
Keyword(s):  
Electron Microscopy ◽  
Polymer Films ◽  
Gum Arabic ◽  
Complete Removal ◽  
Ammonium Bromide ◽  
Release Agent ◽  
Astigmatism Correction ◽  
Long Time ◽  
Micro Holes ◽  
Cetyl Trimethyl Ammonium

Specimen support and astigmatism correction in Electron Microscopy are at least two areas in which lacey polymer films find extensive applications. Although their preparation has been studied for a very long time, present techniques still suffer from incomplete release of the film from its substrate and presence of a large number of pseudo holes in the film. Our method ensures complete removal of the entire lacey film from the substrate and fewer pseudo holes by pre-treating the substrate with Gum Arabic, which acts as a film release agent.The method is based on the classical condensation technique for preparing lacey films which is essentially deposition of minute water or ice droplets on the substrate and laying the polymer film over it, so that micro holes are formed corresponding to the droplets. A microscope glass slide (the substrate) is immersed in 2.0% (w/v) aq. CTAB (cetyl trimethyl ammonium bromide)-0.22% (w/v) aq.

Is the chain dynamics in thin polymer films isotropic ?

2000 ◽  
Vol 10 (PR7) ◽  
pp. Pr7-233-Pr7-237 ◽  
Author(s):  
S. Rivillon ◽  
P. Auroy ◽  
B. Deloche
Keyword(s):  
Polymer Films ◽  
Thin Polymer Films ◽  
Chain Dynamics ◽  
Thin Polymer
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