Adsorption of carbon dioxide on mica surfaces

Carbon dioxide is shown to adsorb on vacuum-cleaved and hydrogen atom bombarded air-cleaved mica surfaces. Two desorption peaks were obtained. Only the high-temperature peak was characterized and is shown to follow second-order desorption kinetics with the peak maximum varying between 372 and 395 K...

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Bibliographic Details
Published in:Langmuir 1989-09, Vol.5 (5), p.1155-1162
Main Author: Bhattacharyya, Krishna G
Format: Article
Language:English
Subjects:
360603 - Materials- Properties
400200 - Inorganic, Organic, & Physical Chemistry
ADSORPTION
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
Chemistry
DATA
DATA ANALYSIS
Exact sciences and technology
EXPERIMENTAL DATA
General and physical chemistry
INFORMATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MATERIALS SCIENCE
MEASURING INSTRUMENTS
MEASURING METHODS
MICA
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
Solid-gas interface
SORPTION
Surface physical chemistry
SURFACE PROPERTIES
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Summary:Carbon dioxide is shown to adsorb on vacuum-cleaved and hydrogen atom bombarded air-cleaved mica surfaces. Two desorption peaks were obtained. Only the high-temperature peak was characterized and is shown to follow second-order desorption kinetics with the peak maximum varying between 372 and 395 K depending upon coverages. The saturation coverage was 9 {times} 10{sup 12} molecules cm{sup {minus}2} for the hydrogen atom bombarded air-cleaved surface and 4.8 {times}10{sup 12} molecules cm {sup {minus}2} for the vacuum-cleaved surface. A possible mechanism for the chemisorption of carbon dioxide on mica surfaces is proposed. The results for the vacuum-cleaved surface were verified with XPS measurements. An apparently abnormal C 1s peak with a binding energy of 279.6 eV was observed when a mica specimen was cleaved in an atmosphere of carbon dioxide. This is explained by proposing the existence of patch electrical fields on the mica surface immediately after the cleaving.
ISSN:0743-7463
1520-5827
DOI:10.1021/la00089a005