Facile preparation of superhydrophobic wood surfaces<i>via</i>spraying of aqueous alkyl ketene dimer dispersions

Arminger, Benjamin; Gindl‐Altmutter, Wolfgang; Keckes, Jozef; Hansmann, Christian

doi:10.1039/c9ra03700d

Cited by 28 publications

(23 citation statements)

References 44 publications

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“…The contact angle reduction factor F CAR, n , originally established to monitor the cross-linking progress of drying oils on wood surfaces, is a way to quantify the decrease of the water contact angle over time. 8 F CAR,100 was calculated here as the difference of the WCA 0 at t = 0 s and the WCA 100 at t = 100 s divided by the initial water contact angle WCA 0 . F CAR,100 of spruce coated with the dilute Emulsion-A (∼0.01% oil content) showed a decline of WCA 0 of up to 40% during the first 100 s of measurement.…”

Section: Resultsmentioning

confidence: 99%

“… 3 , 4 Moreover, the preparation of wax emulsions usually involves heating of the wax prior to dispersion. 4 − 8 Drying oils such as tung oil, linseed oil, as well as biobased synthetic alkyds hold several advantages over waxes. Their high content of triglyceride esters of unsaturated fatty acids endows them with the ability to cross-link after deposition on and penetration of the wood surface.…”

Section: Introductionmentioning

confidence: 99%

“… 19 Moreover, a decrease in the esthetic properties is an often-encountered side effect when increasing the surface roughness, leading to loss of transparency and whitening of the surface due to scattering effects. 8 , 20 − 22 This trade-off between wettability and transparency is a well-known challenge in materials science. 23 Because wood is especially valued for its esthetic appeal, changes to its appearance are undesired.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Wood Hydrophobization Exploiting Natural Roughness Using Minimum Amounts of Surfactant-Free Plant Oil Emulsions

et al. 2021

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Wood in service requires protection from excessive moisture. Herein, we demonstrate that efficient surface hydrophobization can be provided with small amounts of biobased oils, benefitting from the hierarchical roughness inherent to wood surfaces. The developed technique involves coating spruce wood with surfactant-free emulsions based on tung oil, linseed oil, or a linseed oil-based long oil alkyd resin. The ζ-potential of the emulsions was determined by electrophoretic mobility measurements. X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), and spectrophotometry were used to study coated surfaces. XPS measurements confirmed the presence of the tung oil coatings. Tung oil emulsions were effective at concentration levels as low as 0.04 wt % oil content, roughly equivalent to 0.04 g m –2 and led to static water contact angles reaching up to >130°. SEM imaging and AFM measurements provide evidence that the micro- and nanostructures inherent to wood enhance the hydrophobization effect of the obtained coatings. A further benefit of the method lies in only minimal effects of the coating on the surface color and gloss. Thus, the mass-efficient process following several of the principles of green engineering led to improved water repellency while not affecting the visual appearance of the coated wood.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient Wood Hydrophobization Exploiting Natural Roughness Using Minimum Amounts of Surfactant-Free Plant Oil Emulsions

et al. 2021

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“…Spray coating, a simple coating preparation method, can be widely used in engineering practice and is not limited by matrix materials or shapes [27][28][29]. However, poor adhesion between the coating and the substrate always limits further applications of the spray coating method.…”

Section: Introductionmentioning

confidence: 99%

Stable and Durable Conductive Superhydrophobic Coatings Prepared by Double-Layer Spray Coating Method

et al. 2021

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Herein, a low cost, durable, and stable conductive superhydrophobic composite coating (CSC coating) was fabricated on a Q345 steel surface by simple double-layer spray coating. The water contact angle (WCA) of the CSC coating was 160° and the sliding angle (SA) was 3°. In addition to its excellent conductivity (3.10 × 103 Ω), the fabricated composite coating had good durability and wear resistance. After 10 sand-washing cycles, the CSC coating surface still exhibited stable superhydrophobicity (149° WCA, 9.5° SA). At 200 g pressure, the surface of the optimized CSC coating still maintained fine superhydrophobicity (150° WCA, 9.2° SA) and conductivity (1.86 × 104 Ω) after 10 abrasion cycles. In addition, it also exhibited fine adhesion (0.307 MPa) between the composite coating and the substrate. This functional superhydrophobic surface can be applied in specialty fields with harsh conditions such as coal mining and petrochemical activities. This new coating may also expand the application fields of superhydrophobic surfaces and have broad practical application prospects.

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“…In addition, the porous structure of wood provides rich channels for moisture migration (Zhao et al 2020). Because of the undesired properties, wood is susceptible to mildew, decay, and degradation, which limits the use of wood and reduces the service life of wood (Arminger et al 2019). To reduce the hygroscopicity caused by porous structures and hydrophilic groups of wood, many methods have been employed for wood external and internal protection (Barthlott and Neinhuis 1997).…”

Section: Introductionmentioning

confidence: 99%

Surface physical structure and durability of superhydrophobic wood surface with epoxy resin

Fan

Zhao

et al. 2021

BioRes

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In this study, a superhydrophobic wood surface was prepared with amino-functionalized nano-silica (SiO2) particles, epoxy resin (EP) of different curing times, and octadecyltrichlorosilane (OTS). The micro-nano structures of the wood samples were represented by scanning electron microscopy (SEM), while the hydrophobicity and durability of the hydrophobic effect was shown by the contact angle (CA) tests. The results indicated that the optimal curing time of EP was 4 h, such that the wood surface exhibited promising superhydrophobicity with a static CA of 155.4° and a sliding angle (SA) of 3.9°. The different curing time of EP had a remarkable influence on the roughness and the pore structure type of superhydrophobic wood surface. In terms of the Cassie-Baxter theory, the increase of CA on the wood surface was ascribed to the presence of secondary air pores and rough structure in the solid-liquid interface. The obtained wood surface not only possessed excellent adhesion stability and anti-aging properties, but also a resistance to acidic solutions, organic solvents, and mechanical abrasion.

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Facile preparation of superhydrophobic wood surfacesviaspraying of aqueous alkyl ketene dimer dispersions

Abstract: Surfactant-free aqueous wax dispersions for the novel preparation of self-assembled superhydrophobic alkyl ketene dimer coatings on intrinsically hydrophilic wood substrate.

Cited by 28 publications

References 44 publications

Efficient Wood Hydrophobization Exploiting Natural Roughness Using Minimum Amounts of Surfactant-Free Plant Oil Emulsions

Efficient Wood Hydrophobization Exploiting Natural Roughness Using Minimum Amounts of Surfactant-Free Plant Oil Emulsions

Stable and Durable Conductive Superhydrophobic Coatings Prepared by Double-Layer Spray Coating Method

Surface physical structure and durability of superhydrophobic wood surface with epoxy resin

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