Thermally stable and transparent superhydrophobic sol–gel coatings by spray method

Mahadik, Satish A.; Mahadik, D. B.; Kavale, Mahendra S.; Parale, Vinayak G.; Wagh, P. B.; Barshilia, Harish C.; Gupta, Satish C.; Hegde, Nagaraja D.; Rao, A. Venkateswara

doi:10.1007/s10971-012-2798-3

Cited by 88 publications

(31 citation statements)

References 28 publications

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“…Among them, the surface functionalization by inorganic or hybrid organic/inorganic nanoscaled and rough featured thin layers, obtained by sol-gel method, is widely described as one of the simplest [6][7][8][9]. Over this, the present work propose the innovation stemming from the waterbased synthesis of the functional oxide layer, with great advantages in terms of eco-compatibility, versatility and future up-scaling with respect to the current literature which usually presents solvent-based preparation [10,11].…”

Section: Introductionmentioning

confidence: 99%

Wetting behavior and remarkable durability of amphiphobic aluminum alloys surfaces in a wide range of environmental conditions

Raimondo

Blosi

Caldarelli

et al. 2014

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Wetting behavior and remarkable durability of amphiphobic aluminum alloys surfaces in a wide range of environmental conditions

Raimondo

Blosi

Caldarelli

et al. 2014

Chemical Engineering Journal

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“…These types of substrates were used widely in a range of applications such as anti-stain coating, anti-fogging, solar cell, flexible substrate fabrication, self-cleaning, and anti-icing coatings [6][7][8][9][10][11]. The coating methods such as dip coating, spin coating, spraying, and casting methods were used for the preparation of transparent substrates [12][13][14][15]. Nakajima et al prepared transparent superhydrophobic surface by spin coating method under the sublimation of aluminum acetylacetonate (AACA) followed by fluorosilane treatment [16].…”

Section: Introductionmentioning

confidence: 99%

Preparation of superhydrophobic and transparent micro-nano hybrid coatings from polymethylhydroxysiloxane and silica ormosil aerogels

Nagappan

Park

2014

Nano Convergence

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Superhydrophobic and transparent polymethylhydroxysiloxane (PMHOS)/silica ormosil aerogel hybrids were prepared successfully by mixing of PMHOS with various weight percentages of silica ormosil aerogels (as synthesized from methyltriethoxysilane (MTES) and methyltrimethoxysilane (MTMS) precursors) in separate seal perfume glass vials. The hybrids were spin coated on glass substrate at 1000 rpm for 60 seconds and used for further analysis. The surface morphology and chemical compositions of the hybrids were analyzed by high resolution scanning electron microscopy, high resolution transmission electron microscopy, atomic force spectroscopy, adsorption and desorption isotherm, and X-ray photoelectron spectroscopy. The transparency, thermal decomposition and static contact angle (SCA) of each sample were measured by UV-Visible spectrophotometer, TGA and drop shape analysis system, respectively. The spin coated substrates showed good superhydrophobic properties, thermal stability as well as transparency on the glass substrates.Keywords: Superhydrophobic; Transparent; Polymethylhydroxysiloxane; Silica ormosils; Micro-nano hybrid BackgroundTransparency of a substrate is an important factor for coating applications. Transparent substrates with several surface properties such as superhydrophilic (contact angle, CA, ≤5°), hydrophilic (CA, <90°), hydrophobic (CA ≥90°) and superhydrophobic (CA ≥150°) surfaces were prepared using various organic and inorganic hybrid materials [1][2][3][4][5]. These types of substrates were used widely in a range of applications such as anti-stain coating, anti-fogging, solar cell, flexible substrate fabrication, self-cleaning, and anti-icing coatings [6][7][8][9][10][11]. The coating methods such as dip coating, spin coating, spraying, and casting methods were used for the preparation of transparent substrates [12][13][14][15]. Nakajima et al. prepared transparent superhydrophobic surface by spin coating method under the sublimation of aluminum acetylacetonate (AACA) followed by fluorosilane treatment [16]. In another method, the authors also fabricated similar type of transparent superhydrophobic surface using AACA and titanium acetylacetonate (TACA) and fluorosilane [17]. The obtained superhydrophobic surface showed almost 100% transparency when the concentration of TiO 2 was lower than 20%. Meanwhile, increasing the concentration of TiO 2 would lead to reduce the transparency of the coated substrate. Xu et al. recently prepared highly transparent superhydrophobic substrates by spin coating of fluorinated silica nanoparticles on silica wafer or other substrates [18]. The spin coated substrates can produce over 95% of transparency with superhydrophobicity. Fluorine based silane precursors of low surface energy were used widely for changing the hydrophobic surface to superhydrophobic surface [19,20]. This is due to the formation of thin layers of hydrophobic low surface energy materials on the pretreated hierarchical substrates. On the other hand, this might depend on the concentrati...

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“…Silica NPs are widely used to control surface roughness using different coating methods such as spin coating, dip coating, and spray coating. There are many self‐assembly methods used to fabricate superhydrophobic surfaces but most of them lose their rough topography under harsh conditions and thus are unsuitable for long term applications . Rios et al developed solvent‐bonding technique for the NPs and enhanced the mechanical stability of superhydrophobic surfaces but still the durability decreased with increasing mechanical attrition.…”

Section: Introductionmentioning

confidence: 99%

“…The result showed that the contact angle (CA) was maintained above 150° while the sliding angle (SA) increased after abrasion. Other studies also addressed the mechanical robustness under environmental and UV radiation conditions, thermal, chemical, and in water enviroments . In all cases, the loss of roughness led to unstable Cassie state and increased the area of contact between the water droplets and the surface .…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic durable coating based on UV‐photoreactive silica nanoparticles

Nahum

Dodiuk

Dotan

et al. 2014

J of Applied Polymer Sci

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Superhydrophobic surfaces can be obtained by tailoring both the chemistry and roughness topography, mimicking the Lotus leaf characteristics. Most of the synthetic superhydrophobic surfaces reported have been composed of micro and nanoparticles (NPs) embedded in polymer‐based coatings. The particles which tailor the topography are bonded to the base polymers by weak secondary forces. Consequently, the topography integrity is highly affected by handling and surface drag making them unsuitable for long term applications. This work is focused on promoting covalent bonding between the NPs and the base polymer to obtain durable superhydrophobic surfaces. The rough topography was achieved by ultraviolet (UV) curing of SiO2 NPs containing a photoreactive benzophenone moiety in addition to methylated fumed silica NPs which can bind covalently to the polymer base coating, on UV radiation. The hydrophobic chemistry was obtained by fluoroalkylsilane top coating. Coating durability was evaluated using surface air drag and accelerated weathering conditions (UV radiation, humidity and temperature). Results indicated that the proposed approach resulted in superhydrophobic surfaces having high contact angle (>150°) and low sliding angle (<10°) with improved long term durability. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41122.

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Thermally stable and transparent superhydrophobic sol–gel coatings by spray method

Cited by 88 publications

References 28 publications

Wetting behavior and remarkable durability of amphiphobic aluminum alloys surfaces in a wide range of environmental conditions

Wetting behavior and remarkable durability of amphiphobic aluminum alloys surfaces in a wide range of environmental conditions

Preparation of superhydrophobic and transparent micro-nano hybrid coatings from polymethylhydroxysiloxane and silica ormosil aerogels

Superhydrophobic durable coating based on UV‐photoreactive silica nanoparticles

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