Laser-induced wettability alteration in limestone rocks
| Autor: | João Victor Nicolini, Robert Straka, Ricardo Tadeu Lopes, Olga M.O. de Araujo, Helen Conceição Ferraz, Frederico W. Tavares, Keerti Vardhan Sharma |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology Laser 01 natural sciences Fluence law.invention Contact angle Mechanics of Materials law Ultrapure water Materials Chemistry Surface roughness General Materials Science Seawater Wetting Composite material 0210 nano-technology Porosity 0105 earth and related environmental sciences |
| Zdroj: | Materials Today Communications. 17:332-340 |
| ISSN: | 2352-4928 |
| DOI: | 10.1016/j.mtcomm.2018.09.012 |
| Popis: | Alteration of wettability is pre-eminent in improving the efficiency of various industrial applications related to the materials such as metals, polymers, and rocks. We demonstrate wettability alteration in limestone porous rocks using different lasers with different wavelengths and energy. In addition to the chemical changes induced in rocks, laser treatments with different fluence modify the surface roughness of limestone differently. Pulsed Nd:YAG laser (330 mJ/pulse) reduced the surface roughness of limestone from 12.22 μm to 10.10 μm. For ultrapure water/air interface, all laser treated limestone surfaces exhibited increased contact angle. Especially, for seawater/air, pulsed Nd:YAG laser increased the contact angle substantially, from 56.75° to 106.6°, changing the surface from hydrophilic to hydrophobic. For crude oil/ultrapure water interface, increase in contact angles were reported for all laser treated limestone samples. But for crude oil/seawater interface, limestone treated with pulsed Nd:YAG laser exhibited a reduced contact angle of oil/limestone, from 29.4° to 13.3°, making the surface even more oleophobic. |
| Databáze: | OpenAIRE |
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