Synthesis and characterization of superhydrophobic wood surfaces

Wang, Chengyu; Piao, Changhao; Lucas, Cran

doi:10.1002/app.32844

Cited by 92 publications

(57 citation statements)

References 18 publications

(20 reference statements)

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“…Based on the results, it can be concluded that the hydrophobic layers and the oil coating significantly increase the hydrophobicity of natural wood surfaces [14,77]. However, the increase in hydrophobicity after coating application [15,50,52] does not necessarily indicate long-term functionality during exposure to weathering (Figures 6 and 7). In general, the use of hydrophobic layers can only be recommended for sheltered wood (i.e., without leaching of extractives by water), which can lead to easier maintenance and cleaning during use.…”

Section: Resultsmentioning

confidence: 96%

“…This could be potentially prevented using hydrophobic self-cleaning coatings in combination with UV stabilization of the underlying wood. Although more studies have been done to investigate the possibilities of wood surface hydrophobic modification [15,[50][51][52], their long-term efficiency during outdoor exposure should also be considered.…”

Section: Introductionmentioning

confidence: 99%

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Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

et al. 2017

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Abstract:The durability of transparent coatings applied to an oak wood exterior is relatively low due to its anatomic structure and chemical composition. Enhancement of the protection of oak wood against weathering using transparent hydrophobic coatings is presented in this study. Oak wood surfaces were modified using UV-stabilizers, hindered amine light stabilizer (HALS), and ZnO and TiO 2 nanoparticles before the application of a commercial hydrophobic topcoat. A transparent oil-based coating was used as a control coating system. The artificial weathering test lasted 6 weeks and colour, gloss, and contact angle changes were regularly evaluated during this period. The changes in the microscopic structure were studied with confocal laser scanning microscopy. The results proved limited durability against weathering of both tested hydrophobic coatings. The formation of micro-cracks causing the leaching of degraded wood compounds and discolouration of oak wood were observed after 1 or 3 weeks of the weathering test. Until then, an oil-based coating film had protected the wood sufficiently, but after 6 weeks the wood was fully defoliated to its non-homogenous thickness, which was caused by the presence of large oak vessels, and by the effects of specific oak tannins. Using transparent hydrophobic coatings can prolong the service life of the exteriors of wood products by decreasing their moisture content. Without proper construction protection against rainwater, the hydrophobic coating itself cannot guarantee the preservation of the natural appearance of wood exteriors.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

et al. 2017

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“…The space between the ZnO nanorods and the microstructure of the wood surface constituted the nanoscale and microscale roughness of the ZnO nanofilm, respectively. The water contact angle of the prepared wood surfaces was up to 153.5 degrees (Wang et al, 2011). Increased UV protection with nanometal oxides that allow wood texture to remain seen and higher resilience to scratch and abrasion with use of different nanoparticle shapes are some of the applications that are reviewed here (Nikolic et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Study on the Super Hydrophobic of Wood by ZnO Modification

Gan¹,

Lu²,

Liao³

et al. 2017

dtmse

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This paper explores the difference of surface hydrophobicity between unmodified Chinese fir wood and Chinese fir wood modified by ZnO to demonstrate whether ZnO can effectively make the Chinese fir wood with hydrophobic capability. As an excellent furniture material, the specimens of Chinese fir wood was soaked using different concentrations of water acetic acid zinc (Zn (CH 3 COO) 2 -2H 2 O) and six methyl tetramine (C 6

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“…Recently, based on this principle, highly hydrophobic or superhydrophobic surfaces have been successfully fabricated on cellulose-based materials and solid wood substrates by roughening the surface with inorganic nanoparticles in combination with low-surface energy treatments (Li et al 2010;Hsieh et al 2011;Jin et al 2011;Sun et al 2011;Wang et al 2011;Fu et al 2012;Jin et al 2012;Wang et al 2012;Wang et al 2014). However, many of these processes involve multistep procedures or expensive reagents, special equipment, and harsh experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Stable Superhydrophobic Coatings on Wood Surfaces using Silica-Polymer Nanocomposites

Chang

Wang

et al. 2015

BioResources

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Superhydrophobic organic-inorganic composite nanocoatings were fabricated on the intrinsically heterogeneous surfaces of wood using silica-polymer hybrid materials, which were prepared through sol-gel chemistry using tetraethoxysilane (TEOS) as an inorganic precursor and hexadecyltrimethoxysilane (HDTMS) as an organic modifier. The longchain HDTMS acts not only as a hydrophobic agent to lower the surface free energy of the silica particles but also as a bonding agent to aggregate the nanoparticles by polymerization. The degree of aggregation of the silica particles in the coating can be controlled by adjusting the initial concentration of HDTMS, and hence the surface morphology and roughness of the coated wood are tuned. When the concentration of HDTMS reaches a critical level, the formed aggregates of silica particles in combination with the inherent microscale roughness of wood appear to create hierarchical micro/nanostructures on the wood substrate, allowing for the generation of superhydrophobicity. The silicapolymer hybrid coatings on the wood surface are robust enough to withstand high humidity as well as strong acid and alkali whilst retaining its superhydrophobicity. The coatings also exhibit satisfactory durability against water leaching without significantly changing its hydrophobicity, highlighting their potential for outdoor applications.

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Synthesis and characterization of superhydrophobic wood surfaces

Cited by 92 publications

References 18 publications

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

Study on the Super Hydrophobic of Wood by ZnO Modification

Facile Preparation of Stable Superhydrophobic Coatings on Wood Surfaces using Silica-Polymer Nanocomposites

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