Superhydrophobic and Omnidirectional Antireflective Surfaces from Nanostructured Ormosil Colloids

Yıldırım, Adem; Khudiyev, Tural; Daglar, Bihter; Budunoğlu, Hülya; Okyay, Ali Kemal; Bayındır, Mehmet

doi:10.1021/am3024417

Cited by 74 publications

(70 citation statements)

References 51 publications

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“…The most commonly used route to introduce superhydrophobicity in ARCs is through silanization of the respective inorganic nanostructured coating. 21−23 Other approaches include the use of organically modified silica 24,25 or a postdeposition of PTFE. 26 On the contrary, photocatalytic ARCs do not rely on a cleaning medium, but decompose organic contaminants by light induced redox-reactions.…”

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confidence: 99%

Self-Cleaning Antireflective Optical Coatings

et al. 2013

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Low-cost antireflection coatings (ARCs) on large optical surfaces are an ingredient-technology for high-performance solar cells. While nanoporous thin films that meet the zero-reflectance conditions on transparent substrates can be cheaply manufactured, their suitability for outdoor applications is limited by the lack of robustness and cleanability.Here, we present a simple method for the manufacture of robust selfcleaning ARCs. Our strategy relies on the self-assembly of a blockcopolymer in combination with silica-based sol−gel chemistry and preformed TiO 2 nanocrystals. The spontaneous dense packing of copolymer micelles followed by a condensation reaction results in an inverse opal-type silica morphology that is loaded with TiO 2 photocatalytic hot-spots. The very low volume fraction of the inorganic network allows the optimization of the antireflecting properties of the porous ARC despite the high refractive index of the embedded photocatalytic TiO 2 nanocrystals. The resulting ARCs combine high optical and self-cleaning performance and can be deposited onto flexible plastic substrates.

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confidence: 99%

Self-Cleaning Antireflective Optical Coatings

et al. 2013

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“…For example, Bayindir et al prepared a superhydrophobic surface on glass substrates with an omnidirectional antireflective feature using ormosilcolloids. 109 The obtained self-cleaning and omnidirectional antireflective property would be potential for outdoor applications.…”

Section: Grafting Coatingmentioning

confidence: 98%

“…Furthermore, some materials for direct coating may be based on the polymerization in the presence of certain solutions. 124,125 As for colloids, some researchers have reported modified colloids 109,126 for superhydrophobicity, especially for modified silica. For example, Bayindir et al prepared a superhydrophobic surface on glass substrates with an omnidirectional antireflective feature using ormosilcolloids.…”

Section: Grafting Coatingmentioning

confidence: 99%

Recent Advances in the Fabrication of Superhydrophobic Surfaces

Wen¹,

Guo²

2016

Chem. Lett.

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, as a visiting scholar. Now he is a full professor in LICP financed by "Top Hundred Talents" program of CAS. Till now, he has published more than 130 papers about the interfaces of Materials.Miss Qiuying Wen joined Prof. Guo's biomimetic materials of tribology (BMT) group at University of Hubei in 2015 in pursuing her Ph.D. degree. Her current scientific interests are devoted to designing and fabricating applicable superhydrophobic surfaces by using environmentally friendly materials and studying their corresponding applications. AbstractAs one of the most important parts in the surface and interface science, superhydrophobic surfaces play a significant role in both the fundamental research of functional materials and various applications. Therefore, this research field attracts more and more researchers' attention from all over the world. In the past decades, a large number of biomimetic functional superhydrophobic surfaces have been fabricated inspired from the natural superhydrophobic phenomenon. In this paper, we reviewed the recent advances in the research field of superhydrophobic surfaces, mainly including basic principles, fabrication methods, and applications three aspects. In order to facilitate the comparison, fabrication methods have been divided into three classes at first: coating methods, deposition methods, and the method of direct reproduce (template method). Further, each method is subdivided into several more specific sections such as coatings covering self-assembly coating, grafting coating, electrodeposition, electroless deposition, and so on, according to the theory of the coatings bonding with substrates. For each subsection, the corresponding comments of advantages and partly drawbacks have been summarized. In addition, the peculiar applications of superhydrophobic surfaces, such as waterproof function, antibacterial, antibiofouling, antiscaling, anti-icing, and so on, are also mentioned briefly. Finally, current challenges for this research field are also proposed. The aim of this review is to give a brief and crucial overview of the recent advances in the fabrication of superhydrophobic surfaces.

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“…1,2 Their properties have attracted attention due to their wide range of applications, such as in thermal and acoustic insulation, 1 kinetic energy absorption, 3 fiber optics 4 and antireflection coatings. 5 Silica aerogels can be easily synthesized in monoliths, grains, powders and films via sol-gel, 2,6 using common precursors such as tetramethyl orthosilicate (TMOS) and tetraethyl orthosilicate (TEOS), following a critical point drying process. To reduce costs and synthesis complexity, aerogels have been fabricated in ambient conditions using, for instance, TEOS with a silylation process [7][8][9] or a dedicated precursor such as methyltrimethoxysilane (MTMS).…”

Section: Introductionmentioning

confidence: 99%

“…To reduce costs and synthesis complexity, aerogels have been fabricated in ambient conditions using, for instance, TEOS with a silylation process [7][8][9] or a dedicated precursor such as methyltrimethoxysilane (MTMS). 5,10,11 Both methods produce aerogels covered with methyl groups, providing hydrophobic behavior which prevents the possible collapse of the aerogel that might occur upon drying. Silylation is based on the introduction of silyl groups in the aerogel surface before drying, while MTMS precursors yield aerogels in ambient conditions without any modification, since their molecular structure 11 (Fig.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of methyltrimethoxysilane aerogel thin films

et al. 2016

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Aerogels are light and porous solids whose properties, largely determined by their nanostructure, are useful in a wide range of applications, e.g., thermal insulation. In this work, as-deposited and thermally treated air-filled silica aerogel thin films synthesized using the sol-gel method were studied for their thermal properties using the 3-omega technique, at ambient conditions. The thermal conductivity and diffusivity were found to increase as the porosity of the aerogel decreased. Thermally treated films show a clear reduction in thermal conductivity compared with that of as-deposited films, likely due to an increase of porosity. The smallest thermal conductivity and diffusivity found for our aerogels were 0.019 W m−1 K−1 and 9.8 × 10-9 m2 s−1. A model was used to identify the components (solid, gaseous and radiative) of the total thermal conductivity of the aerogel.

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Superhydrophobic and Omnidirectional Antireflective Surfaces from Nanostructured Ormosil Colloids

Cited by 74 publications

References 51 publications

Self-Cleaning Antireflective Optical Coatings

Self-Cleaning Antireflective Optical Coatings

Recent Advances in the Fabrication of Superhydrophobic Surfaces

Thermal properties of methyltrimethoxysilane aerogel thin films

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