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Antisoiling technology: Theories of surface soiling and performance of antisoiling surface coatingsPhysical examination of surfaces undergoing natural outdoor soiling suggests that soil matter accumulates in up to three distinct layers. The first layer involves strong chemical attachment or strong chemisorption of soil matter on the primary surface. The second layer is physical, consisting of a highly organized arrangement of soil creating a gradation in surface energy from a high associated with the energetic first layer to the lowest possible state on the outer surfce of the second layer. The lowest possible energy state is dictated by the physical nature of the regional atmospheric soiling materials. These first two layers are resistant to removal by rain. The third layer constitutes a settling of loose soil matter, accumulating in dry periods and being removed during rainy periods. Theories and evidence suggest that surfaces that should be naturally resistant to the formation of the first two-resistant layers should be hard, smooth, hydrophobic, free of first-period elements, and have the lowest possible surface energy. These characteristics, evolving as requirements for low-soiling surfaces, suggest that surfaces or surface coatings should be of fluorocarbon chemistry. Evidence for the three-soil-layer concept, and data on the positive performance of candidate fluorocarbon coatings on glass and transparent plastic films after 28 months of outdoor exposure, are presented.
Document ID
19850007987
Document Type
Contractor Report (CR)
Authors
Cuddihy, E. F. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Willis, P. B. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 5, 2013
Publication Date
November 15, 1984
Subject Category
ENERGY PRODUCTION AND CONVERSION
Report/Patent Number
JPL-PUBL-84-72
NAS 1.26:174274
DOE/JPL-1012-102
NASA-CR-174274
Funding Number(s)
OTHER: DE-AI01-76ET-20356
PROJECT: JPL PROJ. 5101-251
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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