Reference : Influence of substrate nature and β-lactoglobulin on cleanability after soiling by su...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/183582
Influence of substrate nature and β-lactoglobulin on cleanability after soiling by suspension spraying and drying
English
Toure, Yetioman mailto [Université de Liège - ULiège > > > Doct. sc. agro. & ingé. biol.]
Sindic, Marianne mailto [Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Laboratoire Qualité et sécurité des produits agro-aliment. >]
Dupont-Gillain, C. Christine mailto [Institute of Condensed Matter and Nanosciences – Bio & Soft Matter, Université catholique de Louvain, Croix du Sud 1/L7.04.01, B-1348 Louvain-la-Neuve, Belgium > > > >]
Matagne, André mailto [Université de Liège > Département des sciences de la vie > Enzymologie et repliement des protéines >]
Rouxhet, G. Paul mailto [Institute of Condensed Matter and Nanosciences – Bio & Soft Matter, Université catholique de Louvain, Croix du Sud 1/L7.04.01, B-1348 Louvain-la-Neuve, Belgium > > > >]
16-May-2015
Chemical Engineering Science
Pergamon Press - An Imprint of Elsevier Science
134
823-833
Yes (verified by ORBi)
International
0009-2509
Oxford
United Kingdom
[en] Cleaning ; Fouling ; Particulate soiling ; Protein denaturation ; Surface contaminants ; XPS
[en] Glass and stainless steel (StSteel, AISI304-2R), previously cleaned with ethanol (-Eth) or with ethanol and UV–Ozone treatment (-UVO), were soiled with quartz suspensions in water and in a β-lactoglobulin (β-LGB) solution, and dried. The cleanability (ease of quartz particle detachment) in water was evaluated using a radial-flow cell. The soiling suspension containing β-LGB was used as such or after heating for 4h at 75°C, which provoked coagulation of about 75% of β-LGB. The substrate–solution interfaces were characterized by X-ray photoelectron spectroscopy (XPS) analysis of conditioned substrates and by contact angle measurements. The substrate surfaces are covered by a layer of organic contaminants which are not removed by pre-cleaning or are adsorbed from the surroundings. The presence of β-LGB in the soiling suspension leads to protein adsorption, but a significant amount of contaminants remains at the surface. For three of the substrates tested (Glass-Eth, Glass-UVO, StSteel-UVO) the increase of cleanability when the soiling suspension contained β-LGB may be explained by lower capillary forces acting upon drying. Capillary forces are proportional to the liquid surface tension and depend in a less important way on substrate contact angle. However the order of cleanability observed for the substrates soiled with a suspension of quartz particles in water (Glass-Eth≅Glass-UVO<StSteel-UVO<StSteel-Eth) and the influence of β-LGB on the cleanability of StSteel-Eth may not be explained only by computed capillary forces. The contact angle may exert a direct influence on droplet spreading and particle–substrate contact. The organic contaminants present on the surfaces, which are often neglected by supposing model solid surfaces, may have a significant influence on cleanability through physico-chemical processes which remain to be appreciated.
Researchers ; Professionals ; Students ; General public ; Others
http://hdl.handle.net/2268/183582
10.1016/j.ces.2015.05.039
http://www.sciencedirect.com/science/article/pii/S0009250915003796

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