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Volumn 16, Issue 8, 2000, Pages 3964-3970

Mesoporous thin films of `molecular squares' as sensors for volatile organic compounds

Author keywords

[No Author keywords available]

Indexed keywords

BENZENE; CHARGE TRANSFER; ETHERS; RHENIUM COMPOUNDS; THIN FILMS; VAN DER WAALS FORCES; VOLATILE ORGANIC COMPOUNDS;

EID: 0033740685     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la991252k     Document Type: Article
Times cited : (90)

References (70)
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    • 2).
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    • At higher VOC concentrations, a nonlinear QCM response was obtained, because of condensation wetting of the film and quartz. This prevented quantitative binding studies at higher fractional occupancies.
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    • Strictly speaking, only films of 2 should be described as "mesoporous" if the definition is limited to materials featuring vacancies and channels of about nanometer dimensions and larger. Using the language of zeolite chemistry, films of 1 would perhaps be better described as "microporous". Note that in this community the term describes zeolite-like materials featuring vacancies and channels of subnanometer dimension rather than micron dimension.
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    • 2/mol of molecular square. The values are conservatively calculated by using (a) the planar area of only one face of an adsorbing benzene molecule (i.e., the potential "encapsulating" nature of the host/guest interaction is ignored) and (b) the largest directly observed measures of condensation-free benzene uptake rather than the still larger values that would be derived via extrapolations of best-fit BET isotherms.
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    • A small amount of "uptake" due to condensation is not unexpected: QCM measurements for the size-selective studies were made in an atmosphere that was saturated in crown or dioxane (with solid or liquid sample present, respectively). Experiments probing binding energies on the other interaction were performed at guest vapor pressures that were 45% or less of the saturated vapor pressure-thereby precluding condensation effects. For an instructive discussion of artifacts in SAW/QCM experiments, see: Grate, J. W.; Patrash, S. J.; Abraham, M. H.; Du, C. M. Anal. Chem. 1996, 68, 913.
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