Superhydrophilicity of photocatalytic ZnO/SnO2 heterostructure for self-cleaning applications

Talinungsang,; Upadhaya, Diliraj; Kumar, Pankaj; Purkayastha, Debarun Dhar

doi:10.1007/s10971-019-05127-8

Cited by 30 publications

(11 citation statements)

References 36 publications

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“…Hydroxyl groups can further adsorb water molecules, thereby improving the hydrophilicity of the surface (Caputo et al, 2008;Sahoo et al, 2013). Since the viewpoint that the hydrophilicity and wettability of titanium dioxide (TiO 2 ) polycrystalline films can be transformed by UV irradiation was proposed by Fujishima in 1997 (Wang et al, 1997), several metal oxides including ZnO, a-Fe 2 O 3 , WO 3 , V 2 O 5 and SnO 2 have been found successively to possess the photo-induced hydrophilicity (Feng et al, 2004;Lim et al, 2007;Papadopoulou et al, 2009;Gu et al, 2010;Talinungsang et al, 2019). For example, Papadopoulou et al prepared ZnO nanograins by pulsed laser deposition and proved the light-induced superhydrophilicity in the hydrophobic structures (Papadopoulou et al, 2009).…”

Section: Metal Oxidementioning

confidence: 99%

Dental Materials for Oral Microbiota Dysbiosis: An Update

Zhu

Chu

Luo

et al. 2022

Front. Cell. Infect. Microbiol.

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The balance or dysbiosis of the microbial community is a major factor in maintaining human health or causing disease. The unique microenvironment of the oral cavity provides optimal conditions for colonization and proliferation of microbiota, regulated through complex biological signaling systems and interactions with the host. Once the oral microbiota is out of balance, microorganisms produce virulence factors and metabolites, which will cause dental caries, periodontal disease, etc. Microbial metabolism and host immune response change the local microenvironment in turn and further promote the excessive proliferation of dominant microbes in dysbiosis. As the product of interdisciplinary development of materials science, stomatology, and biomedical engineering, oral biomaterials are playing an increasingly important role in regulating the balance of the oral microbiome and treating oral diseases. In this perspective, we discuss the mechanisms underlying the pathogenesis of oral microbiota dysbiosis and introduce emerging materials focusing on oral microbiota dysbiosis in recent years, including inorganic materials, organic materials, and some biomolecules. In addition, the limitations of the current study and possible research trends are also summarized. It is hoped that this review can provide reference and enlightenment for subsequent research on effective treatment strategies for diseases related to oral microbiota dysbiosis.

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Section: Metal Oxidementioning

confidence: 99%

Dental Materials for Oral Microbiota Dysbiosis: An Update

Zhu

Chu

Luo

et al. 2022

Front. Cell. Infect. Microbiol.

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“…Therefore, besides the difference in the thickness of photocatalytic layers between thin ceramic coating and powder, the features of crystal structures and morphologies of these ceramics can have an influence on their photocatalytic properties. In spite of small thickness, ceramic coatings demonstrate photocatalytic properties [4,5,14,20,[29][30][31][32], although in some cases the photocatalysis rate is low [31].…”

Section: Introductionmentioning

confidence: 99%

Ceramic ZnO-SnO2-Fe2O3 Powders and Coatings -Effective Photogenerators of Reactive Oxygen Species

et al. 2023

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Ceramic ZnO-SnO2-Fe2O3 powders and transparent coatings on glasses prepared using the non-isothermal polymer-salt method demonstrate a strong ability to generate chemically active oxygen species under UV and visible irradiation. Crystal structures and morphologies of these materials were studied using the XRD and the SEM analysis. It was found that there are significant differences in the crystal structure of ceramic powders and thin coatings. The powders consist of randomly oriented oxide nanocrystals of size ~47 nm. The strong orientation of the ZnO nanocrystals due to their interaction with the glass substrate is observed in the coating structure. Experimental data show that thin ceramic coatings are transparent (~90%) in the visible spectral range and the band gap of the ceramic material is 3.44 eV. The band gap value of this multi-component ceramic material is described sufficiently using Verlag’s law. Ceramic powders and coatings demonstrate the intensive photogeneration of reactive oxygen species, both in liquid and air. High photocatalytic activity of ZnO-SnO2-Fe2O3 ceramic coatings and powders was observed upon the oxidation of the diazo dye, Chicago Sky Blue. In the presence of transparent photocatalytic coating, the value of the constant rate of the dye photodecomposition was high (k = 0.056 min−1). It was found that, in spite of their short life time, photogenerated reactive oxygen species demonstrate the ability to decompose dye molecules located up to a distance of 0.5 mm from the surface of ceramic coating. Obtained experimental results suggest that the prepared ceramic materials are promising for different practical applications of the photocatalytic materials.

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“…W. Zhu et al [11] modi ed the surface of two shapes of ZnO (nanorods and nanospheres) with various molar ratios of stearic acid (SA) and they found that the highest water contact angle (WCA) was 158.3 0 at 10%. D. Upadhaya et al [12] prepared ZnO, Tin Dioxide (SnO 2 ) and ZnO/SnO 2 by sol-gel method and covered the surface with SA. They reported WCA of 83.9 0 , 11.8 0 , and the highest WCA of 132.3 0 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Novel Flower Pencil-Like ZnO/myristic acid composite: synthesis, characterization and study of their hydrophobic surfaces

Al-Mulla,

Nawabjan,

Abdulelah

et al. 2023

Preprint

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Nanoflower pencil-like ZnO (diameter 20-24nm) with hexagonal structure was synthesized by sol-gel method. By altering ZnO nanoflower with a myristic acid (MA) that has low surface energy, a composite coating material known as MA-ZnO was successfully fabricated. For the first time, MA was coated on the surface of ZnO nanoflower to create composite coating and it has been confirmed that the shorter-chain MA acid can offer a denser coating on the nanoflower surface compared to other coating with similar volume, which induced super-hydrophobic effect. Different wt% of MA was prepared and mixed with ZnO. The surface morphology, crystalline structure, FTIR, and PL properties of each MA-ZnO composite thin films were investigated. The highest water contact angle (WCA) shown by the composite coating is 164.5º, increment of 90% in comparison to pure ZnO, which proved its super-hydrophobicity.

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Superhydrophilicity of photocatalytic ZnO/SnO2 heterostructure for self-cleaning applications

Cited by 30 publications

References 36 publications

Dental Materials for Oral Microbiota Dysbiosis: An Update

Dental Materials for Oral Microbiota Dysbiosis: An Update

Ceramic ZnO-SnO2-Fe2O3 Powders and Coatings -Effective Photogenerators of Reactive Oxygen Species

Novel Flower Pencil-Like ZnO/myristic acid composite: synthesis, characterization and study of their hydrophobic surfaces

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