Surface Chemistry of 2-Propanol on TiO2(110):  Low- and High-Temperature Dehydration, Isotope Effects, and Influence of Local Surface Structure

2007 ◽  
Vol 111 (29) ◽  
pp. 11059-11067 ◽  
Author(s):  
Oleksandr Bondarchuk ◽  
Yu Kwon Kim ◽  
J. M. White ◽  
Jooho Kim ◽  
Bruce D. Kay ◽  
...  
Keyword(s):  
High Temperature ◽  
Surface Chemistry ◽  
Surface Structure ◽  
Isotope Effects ◽  
Local Surface

High-Temperature Behavior and Surface Chemistry of Carbide MXenes Studied by Thermal Analysis

2019 ◽  
Vol 31 (9) ◽  
pp. 3324-3332 ◽  
Author(s):  
Mykola Seredych ◽  
Christopher Eugene Shuck ◽  
David Pinto ◽  
Mohamed Alhabeb ◽  
Eliot Precetti ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
High Temperature ◽  
Surface Chemistry ◽  
Temperature Behavior ◽  
High Temperature Behavior

The mechanism of the pinacol-pinacone rearrangement. V. Carbon isotope effects

1957 ◽  
Vol 10 (1) ◽  
pp. 7 ◽  
Author(s):  
JF Duncan ◽  
KR Lynn
Keyword(s):  
High Temperature ◽  
Transition State ◽  
Carbon Isotope ◽  
Isotope Effects ◽  
Alternative Mechanism ◽  
Alternative Route ◽  
Temperature Reaction ◽  
Exchange Reactions ◽  
Carbonium Ion ◽  
High Temperature Reaction

The intermolecular isotope effects of methyl-labelled and alcoholic carbon-labelled pinacol converted to pinacone have been studied over a temperature range of 60-113.5 �C. Tests were made to establish the validity of the results by using two starting materials for synthesizing methyl-labelled pinacol, and several different methods of analysing the products. The isotope effects were determined by measurements made both on (i) pinacol and (ii) pinacone. The results above 80 �C can be interpreted in terms of the synartetic ion mechanism provided both the carbonium ion and the transition state are largely unhydrated, and both the formation of the carbonium ion and the methyl migration are slow steps. Below 60 �C an alternative mechanism is operative. Unless unsuspected exchange reactions are present, the results suggest that the transition state is not so greatly distorted from a simple ethane-type configuration as in the high temperature reaction. Results at intermediate temperatures indicate that the alternative route proceeds via a stable intermediate.

Investigation of the surface chemistry of Teflon. 1. Effect of low energy argon ion irradiation on surface structure

Langmuir ◽  
1993 ◽  
Vol 9 (3) ◽  
pp. 740-748 ◽  
Author(s):  
Beng Jit Tan ◽  
Mebrahtu Fessehaie ◽  
Steven L. Suib
Keyword(s):  
Surface Chemistry ◽  
Surface Structure ◽  
Ion Irradiation ◽  
Low Energy ◽  
Argon Ion
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