An electron spin resonance probe for the solvation of ionomer membranes and other microscopically heterogeneous systems. Copper(2+) in Nafion, Sephadex, and silica gel

Langmuir ◽  
1992 ◽  
Vol 8 (1) ◽  
pp. 249-253 ◽  
Author(s):  
Janusz Bednarek ◽  
Shulamith Schlick
Keyword(s):  
Electron Spin Resonance ◽  
Silica Gel ◽  
Electron Spin ◽  
Heterogeneous Systems ◽  
Ionomer Membranes ◽  
Spin Resonance

Electron Spin Resonance Study of Surface Defects of Silica Gel Formed by Gas Discharges

1971 ◽  
Vol 49 (3) ◽  
pp. 352-356 ◽  
Author(s):  
K. Hukuda ◽  
Y. Amenomiya
Keyword(s):  
Electron Spin Resonance ◽  
Silica Gel ◽  
Electron Spin ◽  
Surface Defects ◽  
Hydroxyl Group ◽  
Electron Spin Resonance Study ◽  
Gas Discharges ◽  
Spin Resonance ◽  
Magnetic Center ◽  
Spin Resonance Study

Surface defects of silica gel formed by a microwave electric discharge in a stream of oxygen and of nitrogen have been studied by means of electron spin resonance (e.s.r.) spectroscopy. The magnetic center is identified as a hole trapped by a surface oxygen atom which is formed by the removal of a hydrogen atom from a hydroxyl group. The principal values of the g-tensor were found to be gxx = 2.037, gyy = 2.008, and gzz = 2.002, respectively, where the direction of x-axis was taken along the O—Si bond. The center has a weak hyperfine interaction with a hydrogen nucleus of an adjacent hydroxyl group. The hyperfine splitting is 15 Oe.

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