A review on ‘self-cleaning and multifunctional materials’

Prathapan, Ragesh; Ganesh, V.; Nair, Shantikumar V.; Nair, A. Sreekumaran

doi:10.1039/c4ta02542c

Cited by 423 publications

(240 citation statements)

References 242 publications

(195 reference statements)

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“…Such materials possess chemical and textural features inspired by nature: lotus leaves, butterfly wings and fish scales [144]. In particular, TiO 2 is an attractive material for its self-cleaning properties, which originate from a combination of the photocatalytic oxidative decomposition of organic contaminants and superhydrophilicity.…”

Section: Self-cleaning Surfacesmentioning

confidence: 99%

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

et al. 2017

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Photocatalytic nanomaterials such as TiO 2 are receiving a great deal of attention owing to their potential applications in environmental remediation. Nonetheless, the low efficiency of this class of materials in the visible range has, so far, hampered their large-scale application. The increasing demand for highly efficient, visible-light-active photocatalysts can be addressed by hybrid nanostructured materials in which two or more units, each characterised by peculiar physical properties, surface chemistry and morphology, are combined together into a single nano-object with unprecedented chemical-physical properties. The present review intends to focus on hybrid nanomaterials, based on TiO 2 nanoparticles able to perform visible-light-driven photocatalytic processes for environmental applications. We give a brief overview of the synthetic approaches recently proposed in the literature to synthesise hybrid nanocrystals and discuss the potential applications of such nanostructures in water remediation, abatement of atmospheric pollutants (including NO x and volatile organic compounds (VOCs)) and their use in self-cleaning surfaces.

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Section: Self-cleaning Surfacesmentioning

confidence: 99%

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

et al. 2017

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“…23 Superhydrophobic surfaces with efficient water shedding and self-cleaning properties result. 24,25 However, the design of surfaces that also repel low-surface-tension liquids such as oils is signicantly more challenging. The challenge arises from the fact that regular surface features with vertical side walls only support a Cassie-Baxter wetting state with liquids having a contact angle of >90 on a at surface.…”

Section: -17mentioning

confidence: 99%

“…41 This precise connement of aqueous solutions to designated parts of the surface nds application in a wide range ) and the reference substrate (contact angle approximately 25 ) can be seen.…”

mentioning

confidence: 99%

Tailoring re-entrant geometry in inverse colloidal monolayers to control surface wettability

et al. 2016

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Controlling the microscopic wetting state of a liquid in contact with a structured surface is the basis for the design of liquid repellent as well as anti-fogging coatings by preventing or enabling a given liquid to infiltrate the surface structures. Similarly, a liquid can be confined to designated surface areas by locally controlling the wetting state, with applications ranging from liquid transport on a surface to creating tailored microenvironments for cell culture or chemical synthesis. The control of the wetting of a low-surfacetension liquid is substantially more difficult compared to water and requires surface structures with overhanging features, known as re-entrant geometries. Here, we use colloidal self-assembly and templating to create two-dimensional nanopore arrays with tailored re-entrant geometry. These pore arrays, termed inverse monolayers, are prepared by backfilling a sacrificial colloidal monolayer with a silica sol-gel precursor material. Varying the precursor concentration enables us to control the degree to which the colloids are embedded into the silica matrix. Upon calcination, nanopores with different opening angles result. The pore opening angle directly correlates with the re-entrant curvature of the surface nanostructures and can be used to control the macroscopic wetting behavior of a liquid sitting on the surface structures. We characterize the wetting of various liquids by static and dynamic contact angles and find correlation between the experimental results and theoretical predictions of the wetting state based on simple geometric considerations. We demonstrate the creation of omniphobic surface coatings that support Cassie-Baxter wetting states for liquids with low surface tensions, including octane (g ¼ 21.7 mN m À1). We further use photolithography to spatially confine such low-surface-tension liquids to desired areas of the substrate with high accuracy.

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“…Superhydrophobic surfaces are eagerly anticipated for use in applications such as self-cleaning coatings, [1][2][3][4][5] non-wetting fabrics, 6,7 and anti-icing and anti-fogging surfaces. 8 A superhydrophobic coating is usually fabricated by coating with a layer of low surface energy materials on the substrate surface constructed with a similar surface morphology to that of lotus leaves.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of anhydrite whiskers and their potential application for durable superhydrophobic coatings

et al. 2017

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Durability issues have been an obstacle for superhydrophobic coating applications for a long time. Here, we report the modification of anhydrite whiskers that can be used for the fabrication of superhydrophobic coatings with high durability. Anhydrite whiskers with core/shell structures are prepared via hydrolysis and condensation processes of tetraethyl orthosilicate (TEOS) followed by silane modification. Modified anhydrite whiskers were examined by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results indicate that anhydrite whiskers exhibit an obviously hydrophobic quality after modification, reaching a contact angle of up to 123. The thickness of the surface modification layer is 10-20 nm. The modified anhydrite whiskers were used to fabricate a superhydrophobic coating. Modified anhydrite whiskers create a rough structure on the glass substrate surface. This roughness develops a Cassie-Baxter regime, enhancing the superhydrophobicity of the coating. The water contact angle of the coating is above 150 . This method is expected to apply to similar materials for the fabrication of durable superhydrophobic coatings.

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A review on ‘self-cleaning and multifunctional materials’

Cited by 423 publications

References 242 publications

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

Tailoring re-entrant geometry in inverse colloidal monolayers to control surface wettability

Surface modification of anhydrite whiskers and their potential application for durable superhydrophobic coatings

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