Fabrication of amphiphobic softwood and hardwood by treatment with non-fluorinated chemicals |
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| Authors: | Zhenguan?Tang Linkun?Xie Dennis?W?Hess Email author" target="_blank">Victor?BreedveldEmail author |
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| Institution: | 1.School of Chemical and Biomolecular Engineering,Georgia Institute of Technology,Atlanta,USA;2.Renewable Bioproducts Institute,Georgia Institute of Technology,Atlanta,USA;3.Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products,Southwest Forestry University,Kunming,People’s Republic of China |
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| Abstract: | Amphiphobic wood has successfully been fabricated using a combination of O2 plasma surface activation and coating of pre-hydrolyzed methyltrimethoxysilane (MTMS). The effect of O2 plasma activation on surface chemistry and surface roughness was investigated using X-ray photoelectron spectroscopy and laser scanning confocal microscope profilometry, respectively. Pre-hydrolyzed MTMS was used to impart oleophobicity to both softwood and hardwood samples with tunable hydrophilicity by adjusting the sonication time during pre-hydrolysis. Depending on hydrolysis time, the coated wood samples display wetting behavior ranging from superhydrophilic/oleophobic (immediate water absorption; motor oil contact angles 63.5° for hardwood and 62.4° for softwood) to amphiphobic (water contact angles 104.3° for hardwood and 91.1° for softwood; motor oil contact angles 68.7° for hardwood and 63.9° for softwood), without affecting visual appearance of the wood. For all plasma-activated MTMS-coated wood samples, no absorption of motor oil is observed for several months, indicating stable oil resistance. The intrinsic porosity of wood is also partially retained after coating. |
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