TiO<sub><b>2</b></sub>and ZnO Nanoparticles in Photocatalytic and Hygienic Coatings

Jašková, Veronika; Hochmannova, Libuse; Vytřasová, Jarmila

doi:10.1155/2013/795060

Cited by 39 publications

(25 citation statements)

References 23 publications

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“…The principal source of infectious agents is the direct contact with patients, usually by the hands of healthcare workers and by the medical equipment [13]. But since the hospital environment is susceptible to be contaminated, common surfaces can act as a niche to microbes' adhesion and colonization, allowing the spread of nosocomial infections [14,15]. Those surfaces comprise room door handles, keyboards and taps, stethoscopes, ward fabrics and plastics, healthcare worker's pens and telephones [16].…”

Section: Introductionmentioning

confidence: 99%

Antifungal activity of ZnO thin films prepared by glancing angle deposition

et al. 2019

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Highlights• Zinc Oxide thin films were deposited by reactive magnetron sputtering;• Inclined columns changed the thin films' surface porosity;• Sputtering incidence angle affects microstructure and antifungal properties;• Mesoporous thin films improved the antifungal properties against Candida albicans; ABSTRACTThin films of zinc oxide (ZnO) were produced by reactive DC magnetron sputtering with sputtering angles of α = 0º, 40º, 60º and 80º (glancing angle deposition configuration), aiming to be tested against the opportunist pathogenic fungus Candida albicans. The results showed the formation of stoichiometric ZnO thin films, with inclined columns for incidence angles equal to or more than 40º. All thin films presented high transparency in the visible range above the bandgap region (near 380 nm). The deposition conditions gave rise to a three-fold increase of the surface porosity with the increment of the incidence angle. Noteworthy, is the formation of different types of pores distributions, from micro-, through meso-, to macropores. Regarding the biological effect, the thin films produced with inclined columns presented a significant antifungal activity, with the inhibition of viable cell growth by 68 %. Moreover, the formation of mesoporous films enhanced the antifungal properties of ZnO thin films against Candida albicans. The overall behaviour indicates that these thin films are promising candidates to be applied in antimicrobial surfaces, as well as to be used in further studies to determine the molecular mechanisms involved in the antimicrobial action of ZnO.3

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Section: Introductionmentioning

confidence: 99%

Antifungal activity of ZnO thin films prepared by glancing angle deposition

et al. 2019

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“…The nanometer-sized oxide particles represent a class of materials with important applications in numerous fields of industry ranging from catalysis1, nanofluids2, advanced ceramics3, paints4, mining and soil5, gas sensors6, UV absorption materials7, cement8, food9 and cosmetics10, and numerous others1112131415. Nanostructured alumina is one of the most commonly used, extensively studied ceramic oxides.…”

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confidence: 99%

Direct Visualization of the Hydration Layer on Alumina Nanoparticles with the Fluid Cell STEM in situ

Firlar

Çınar

Kashyap

et al. 2015

Sci Rep

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Rheological behavior of aqueous suspensions containing nanometer-sized powders is of relevance to many branches of industry. Unusually high viscosities observed for suspensions of nanoparticles compared to those of micron size powders cannot be explained by current viscosity models. Formation of so-called hydration layer on alumina nanoparticles in water was hypothesized, but never observed experimentally. We report here on the direct visualization of aqueous suspensions of alumina with the fluid cell in situ. We observe the hydration layer formed over the particle aggregates and show that such hydrated aggregates constitute new particle assemblies and affect the flow behavior of the suspensions. We discuss how these hydrated nanoclusters alter the effective solid content and the viscosity of nanostructured suspensions. Our findings elucidate the source of high viscosity observed for nanoparticle suspensions and are of direct relevance to many industrial sectors including materials, food, cosmetics, pharmaceutical among others employing colloidal slurries with nanometer-scale particles.

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“…For some of the traditional uses such as paints and coatings, TiO 2 NPs are incorporated into the bulk material where their tight size control provides a material with enhanced hardness, scrub resistance, and contrast ratio, storage stability and gloss [30,31]. Recently, a lot of interest attracted the application of TiO 2 NPs as photocatalyst in hygienic coatings [32].…”

Section: Hr-tem and Eds Analysesmentioning

confidence: 99%