A quartz crystal microbalance study of the removal of solid organic soils from a hard surface in aqueous surfactant solution |
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| Institution: | 1. CSIRO Molecular Science, Private Bag 10, Clayton South MDC, Victoria 3169, Australia;2. Department of Applied Chemistry, Royal Melbourne Institute of Technology, City Campus, Latrobe Street, Melbourne, Victoria 3000, Australia;1. Computational Biology Lab (DLab), Fundacion Ciencia & Vida, Av. Zañartu 1482, Ñuñoa, Santiago, Chile;2. Centro Interdisciplinario de Neurociencias de Valparaíso (CINV), Pasaje Harrington 287, Playa Ancha, Valparaíso, Chile;3. Laboratorio de Superficies (SurfLab), Instituto de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile;4. Centro de Investigación en Nanotecnología y Materiales Avanzados (CIEN-UC), Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile;1. Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, Ed. 6, 90128, Palermo, Italy;2. Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, Parco d''Orleans II, 90128 Palermo, Italy;3. Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Viale delle Scienze, Parco d''Orleans II, 90128, Palermo, Italy;1. Division of Advanced Materials, Korea Research Institute of Chemical Technology, Daejeon, 34114, Republic of Korea;2. Department of Chemical Engineering, Hankyong National University, Anseong, 17579, Republic of Korea;3. Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Wanju-gun, Jeonbuk 55324, Republic of Korea |
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| Abstract: | A quartz crystal microbalance (QCM) has been employed to monitor the removal of two model solid organic soils, dotriacontane and tripalmitin, from the hard surface of the QCM crystal in aqueous surfactant solutions of octa-ethyleneglycol mono n-dodecyl ether (C12E8). We have investigated the effect of varying the thickness of the soil coating on soil removal and the effect of soaking the soil in high-purity water for an extended period of time before adding surfactant. The QCM results support the view that net soil removal is preceded by a stage of water and surfactant penetration into the soil. The rate of penetration and rate of removal depends on the soil type. Water and surfactant take longer to penetrate dotriacontane compared to tripalmitin coatings. The removal process also occurs over a longer period of time in the case of dotriacontane coatings. The percentage of material removed is less for dotriacontane, compared to tripalmitin coatings. The initial coating thickness on the hard surface does not appear to govern the final percentage of soil removed, at least in the thickness range accessible to the QCM (approximately ≤800 nm). Immersing the soil coated surfaces in water for a relatively long time, hastens the onset of the removal stage after surfactant is added but does not significantly influence the rate and extent of removal from the hard surface. |
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