Changes Induced by Hydrogenation

Schottky diodes on p-type Si treated in a plasma of water vapor and also found a decreased capacitance for the same reason. 

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Janssen HH, Oeschger R. 1992. The body wall of Halicryptus spinulosus (Priapulida)-ultrastructure and changes induced by hydrogen sulfide. Hydrobiologia 230 219-230. 

A very interesting example of morphological change induced by hydrogenation of the B block in an S-B-M triblock terpolymer was obtained for symmetric systems with ca. 27% B. While the... 

Fig. 7 SEM imaging and analysis of UNCD films grown with different hydrogen contents in the Ar/CHt plasma, showing the microstructure changes induced by hydrogen incorporation into the films. The best microstructure is for 1% Ha in the plasma, since this is the densest, thus the most hermetic for liquid penetration (Reproduced from Ref. [40] with permission from WUey])...

Attention should be paid to specific interactions, which should be taken into account in the interpretation of spectral shifts in relation to the polarity of a medium. Drastic changes in the fluorescence spectrum may indeed be induced by hydrogen bonding. 

Radiation Biochemistry of Proteins and Amino Acids. Up to the levels of 500 krads the changes in pigment properties of heme proteins are similar to those caused by oxidation or reduction. Changes in the proteins, in addition to deamination and loss of —SH groups, indicate a partial de-naturation similar to that induced by hydrogen ions. This results in some enhancement of reactivity of the heme portion (2). 

The monomer to inverse micelle transition of dodecylammonium propionate (DAP) in CH2G2 was monitored by tire shifts in the COO bands. Addition of water caused further decreases in the COO- band frequency due to headgroup hydration. Micelle formation in hexane yielded similar spectroscopic changes (83). Frequency shifts induced by hydrogen bonding to water in the inverse micelle core were illustrated for phosphonate, carboxylate, and sulfate headgroups (84). 

As a standard procedure the catalysts are reduced with hydrogen in water at 363 K for half an hour. In this way all the platinum is in the zero-valent state and any changes induced by temperature effects during reaction can be ruled out. 

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