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The electrochemical (COOH) 2 oxidation reaction was studied at high potentials (i.e. in the region where O 2 is evolved) in acidic, aqueous solutions using conductiveW O x based anodes. The WO x films used as anodes also contained Pt 'micro'-centers. Comparative oxidation studies were also carried out using antimony doped SnO 2 anodes. More rapid (COOH) 2 oxidation rates were observed for the WO x based anodes than for the antimony doped SnO 2 anodes. The (COOH) 2 oxidation reaction studied under the conditions used in this work was shown to be activation rather than mass transport controlled. The (COOH) 2 oxidation rate constant was found to be independent of the applied potential using the WO x based anodes. This likely suggests that a chemical reaction is involved in the (COOH) 2 oxidation reaction. This chemical reaction is also suggested to be the rate determining step in the (COOH) 2 to CO 2 oxidation reaction. Furthermore, it is believed that the (COOH) 2 oxidation reaction involves adsorptive interactions of this organic with the Pt/WO x anode surface. #

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The curve obtained from this expression gives an excellent fit with the data relating shrinkage of collagen at 50°in 1.0 M KI at pH 2.0 with time (Fig. 6), using values of 1.1 for k and 360 for M. The rate constant k will vary with temperature, nature of the salt used, pH and salt concentration. The constant, M, will vary with temperature, pH, nature of the salt and applied stress.1 2 3•19 By vary-

An investigation has been made of the effect of neutron irradiation on the following properties of a copperactivated zinc sulfide phosphor: luminescence efficiency under ultraviolet and x-ray excitation, infrared quenching of luminescence, temperature dependence of luminescence efficiency, thermoluminescence, rise time of luminescence, decay of luminescence, and dependence of the rise time of luminescence on the previous history of the sample. In addition, the analogous changes in the dielectric constant of the phosphor on illumination were measured for samples damaged to varying degree by neutrons. It was shown that neutron damage can be removed by annealing at high temperature.M ANY studies have shown that nuclear radiation changes a number of different properties of solids. 1-13 However, the study of the effects of nuclear radiation on luminescent materials has been exclusively confined, since its discovery by Marsden, 14 and Rutherford 15 to the study of the interaction of alpha-particles with zinc sulfide. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] It was found that alpha-particles decrease the luminescence efficiency of the phosphor not t Preliminary account published in the J. Chem. Phys. 21, 367 (1953).