Projects per year
Abstract
To better understand the complex system of wet foams in the presence of cellulosic fibers, we investigate bubble-surface interactions by following the effects of surface hydrophobicity and surface tension on the contact angle of captive bubbles. Bubbles are brought into contact with model silica and cellulose surfaces immersed in solutions of a foaming surfactant (sodium dodecyl sulfate) of different concentrations. It is observed that bubble attachment is controlled by surface wetting, but a significant scatter in the behavior occurs near the transition from partial to complete wetting. For chemically homogeneous silica surfaces, this transition during bubble attachment is described by the balance between the energy changes of the immersed surface and the frictional surface tension of the moving three-phase contact line. The situation is more complex with chemically heterogeneous, hydrophobic trimethylsilyl cellulose (TMSC). TMSC regeneration, which yields hydrophilic cellulose, causes a dramatic drop in the bubble contact angle. Moreover, a high interfacial tension is required to overcome the friction caused by microscopic (hydrophilic) pinning sites of the three-phase contact line during bubble attachment. A simple theoretical framework is introduced to explain our experimental observations.
Original language | English |
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Pages (from-to) | 7296-7308 |
Number of pages | 13 |
Journal | Langmuir |
Volume | 36 |
Issue number | 26 |
DOIs | |
Publication status | Published - 7 Jul 2020 |
MoE publication type | A1 Journal article-refereed |
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BioELCell: Bioproducts Engineered from Lignocelluloses: from plants and upcycling to next generation materials
Rojas Gaona, O., Abidnejad, R., Ajdary, R., Bhattarai, M., Zhu, Y., Zhao, B., Robertson, D., Reyes Torres, G., Johansson, L., Garcia Greca, L., Klockars, K., Kämäräinen, T., Majoinen, J., Tardy, B., Dufau Mattos, B. & Ressouche, E.
30/07/2018 → 31/07/2023
Project: EU: ERC grants
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FinnCERES: Competence Center for the Materials Bioeconomy: A Flagship for our Sustainable Future
01/05/2018 → 31/12/2022
Project: Academy of Finland: Other research funding
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SIRAF: Surface Interactions and Rheology of Aqueous Cellulose-based Foams (SIRAF)
Tardy, B., Rojas Gaona, O., Ishfaq, A., Lehtonen, J., Johansson, L., Beaumont, M., Klockars, K., Zhu, Y., Dufau Mattos, B., Borghei, M. & Xiang, W.
01/09/2016 → 31/08/2020
Project: Academy of Finland: Other research funding