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Enhanced hydrophilicity of chlorided aluminum oxide particulatesAn enhancement of hydrophilicity for chlorided aluminas was demonstrated by the results obtained from gaseous H2O sorptions at 70-, 80-, and 86-percent relative humidity on alpha and gamma aluminum oxide particulates and on alpha and gamma aluminum oxide particulates with a chemisorbed surface chloride phase (produced by reactions of gaseous HCl + H2O on alumina). Continuous sorption histories for H2O on chlorided aluminas having specific surface areas that range from 7 to 227 sq m/g before chloriding indicated that initial sorption rates were directly linked to the extent of chemisorbed chlorided coverage and implied the same relationship for sorption capacities. The initial sorption rate on chlorided aluminas was found to be slower for the first exposure to H2O than for subsequent exposures (which reached equilibrated H2O coverages much faster), suggesting that slow chemical reactions between H2O and chlorided alumina may have been operative during initial exposures. Chlorided alumina particles were found to remain very hydrophilic (relative to nonchlorided analogs) for several H2O sorption/desorption cycles.
Document ID
19790004007
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Cofer, W. R., III (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
November 1, 1978
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
L-12265
NASA-TP-1312
Accession Number
79N12178
Funding Number(s)
PROJECT: RTOP 506-21-33-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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