Rheology and UV-protecting properties of complex suspensions of titanium dioxides and zinc oxides

Nasu, Akio; Otsubo, Yasufumi

doi:10.1016/j.jcis.2007.02.012

Cited by 53 publications

(36 citation statements)

References 19 publications

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“…In recent years, several inorganic and organic fillers were proposed, i.e., silanes [7,13], unmodified and modified silica [14,15], carbon nanotubes [2], carbon black [3,13], starch, cellulose [16], titanium dioxide, zinc oxide [17,18], magnesium hydroxide [19], silver nanoparticles [20], wood flour and other lignocellulosic fibers [21].…”

Section: Introductionmentioning

confidence: 99%

Effect of high loading of titanium dioxide particles on the morphology, mechanical and thermo-mechanical properties of the natural rubber-based composites

2016

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Section: Introductionmentioning

confidence: 99%

Effect of high loading of titanium dioxide particles on the morphology, mechanical and thermo-mechanical properties of the natural rubber-based composites

2016

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“…The use of TiO 2 either in the form of particles, films, or coatings has been widely investigated during the past several decades as an active substance for the destruction of organic pollutants [3][4][5][6][7] and the growth inhibition of microorganisms [8][9][10], and as an ultraviolet (UV) absorber in cosmetics or modified O.-U. Nimittrakoolchai Á S. Supothina (&) National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Rd., Klong Luang, Pathumthani 12120, Thailand e-mail: sitthis@mtec.or.th textiles [11][12][13]. So far, TiO 2 has been known as the photocatalytic material that possesses high activity, strong oxidizing power, and long-term stability.…”

Section: Introductionmentioning

confidence: 99%

Bactericidal activity and UV-filtering property of TiO2-based photocatalysts coated on curtain fabrics

Nimittrakoolchai

Supothina

2009

Res Chem Intermed

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Synthesized and commercial titanium dioxide (TiO 2 ) were coated onto household curtain fabrics for anti-microbial and ultraviolet (UV) shielding functions. The coating was performed by inducing a deposition of the TiO 2 layer from the Ti precursor onto the fabric surface. A silane adhesive agent was employed to improve the adhesion between the coating and the fabric. Ag nanoparticles were also incorporated into some samples to further improve the anti-bacterial activity, which was evaluated by a standard qualitative test (AATCC 147). Efficiency for UV shielding was evaluated by measuring a UV-visible reflection of the coated fabrics both before and after subjecting it to several washing cycles. The results showed that the TiO 2 -coated fabrics had potential as both anti-bacterial and UV shielding for the curtain industry.

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“…O dióxido de titânio tem sido correntemente aplicado como protetor solar físico atuando na proteção da pele contra radiação UVB [19] enquanto a radiação UVA é predominantemente absorvida pelo óxido de zinco [19] . Por outro lado, a incidência direta de radiação UV sobre as nanopartículas de dióxido de titânio promove elétrons da banda de valência para a banda de condução do semicondutor com a geração de pares elétron-buraco e a subsequente recombinação/migração para a superfície das partículas (em tempos da ordem de 0.1 ps) 20] .…”

Section: Procedimento Experimentalunclassified

Preparação e caracterização de microfibras de poli(álcool vinílico)/dióxido de titânio

Oliveira¹,

Moura²

2013

Polímeros

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Resumo:Compósitos de poli(álcool vinílico)/dióxido de titânio preparados pela técnica de eletrofiação são potenciais candidatos para aplicações nas quais grande absorbância na região do ultra-violeta e transparência na região do visível são requeridas. A incorporação de semicondutor nas fibras pode ser inferida pela redução da impedância elétrica das fibras fabricadas por eletrofiação, como consequência do aumento na densidade de grãos de semicondutor dispersos nas fibras poliméricas. As propriedades térmicas do compósito polímero/semicondutor são dominadas pela resposta do PVA sendo a influência do dióxido de titânio detectada no espectro de absorção de luz pela maximização da absorbância na faixa de 240 nm a 400 nm. Os resultados indicam que o compósito de PVA/TiO 2 pode ser convenientemente aplicado como curativo com proteção adicional contra efeitos de radiação ultravioleta (UVA e UVB) na pele humana. Uma aplicação adicional para o compósito PVA/TiO 2 foi abordada com o estudo dos processos fotocatalíticos na degradação da rodamina B. Palavras-chave: Eletrofiação, compósitos poliméricos, dióxido de titânio, poli(álcool vinílico). Preparation and Characterization of Polyvinyl Alcohol/Titanium Dioxide MicrofibersAbstract: Electrospun composites of polyvinyl alcohol/titanium dioxide are potential candidates for applications that require high level of absorbance in the UV and transparency in the visible region. The incorporation of semiconductor particles in the core of fibers can be inferred from the reduction in the electrical impedance of electrospun fibers, as a consequence of the increased density of semiconductor granules along the fiber. The thermal properties of PVA dominate in the complete response of the composite while the influence from titanium dioxide is noted with an increased absorption from 240 nm to 400 nm. The results indicate that the PVA/TiO 2 composites can be applied as wound dressing with additional protection against effects of ultraviolet radiation (UVA and UVB) on human skin. An additional application studied here was based on the use of PVA/TiO 2 nanocomposites as active agent in photodegrading rhodamine B. Keywords: Electrospinning, polymeric composites, titanium dioxide, polyvinyl alcohol. IntroduçãoA eletrofiação representa um método simples e de baixo custo que promove a fabricação de uma grande quantidade de fibras ultrafinas. Baseadas nesta propriedade, diversas aplicações têm sido consideradas para esses materiais, das quais podemos destacar: novos biomateriais, detectores de voláteis [1] e dispositivos "labs on a chip" [2] . A potencialização de aplicações médicas como medicina regenerativa [3] /substituição de pele [4] e liberação controlada de fármacos [5] depende da aplicação de hidrogéis (naturais e sintéticos) com potencial biocompatibilidade e pequeno tamanho de poro associado à elevada área superficial. Em todos os casos descritos anteriormente, o uso de hidrogéis como a quitosana e o PVA são fundamentais para a produção de micro/nano fibras [6] . No caso do PVA, (polím...

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Rheology and UV-protecting properties of complex suspensions of titanium dioxides and zinc oxides

Cited by 53 publications

References 19 publications

Effect of high loading of titanium dioxide particles on the morphology, mechanical and thermo-mechanical properties of the natural rubber-based composites

Effect of high loading of titanium dioxide particles on the morphology, mechanical and thermo-mechanical properties of the natural rubber-based composites

Bactericidal activity and UV-filtering property of TiO2-based photocatalysts coated on curtain fabrics

Preparação e caracterização de microfibras de poli(álcool vinílico)/dióxido de titânio

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