Influence of substrate nature and β-lactoglobulin on cleanability after soiling by suspension spraying and drying
(2015) Chemical Engineering Science — Vol. 134, p. 823-833 (2015)
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- 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 about75% 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 a readsorbed 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.
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Touré, Y., Sindic, M., Dupont, C., Matagne, A., & Rouxhet, P. (2015). Influence of substrate nature and β-lactoglobulin on cleanability after soiling by suspension spraying and drying. Chemical Engineering Science, 134, 823-833. https://doi.org/10.1016/j.ces.2015.05.039 (Original work published 2015)