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https://www.readbyqxmd.com/read/30449826/in-vitro-evaluation-of-visible-light-activated-titanium-dioxide-photocatalysis-for-in-office-dental-bleaching
#1
Marla Cuppini, Vicente Castelo Branco Leitune, Marcela de Souza, Annelise Kopp Alves, Susana Maria Werner Samuel, Fabrício Mezzomo Collares
The evaluation of the photocatalysis of visible light activated titanium dioxide employed in hydrogen peroxide (H2 O2 ) was carried using seven H2 O2 solutions (3.5 and 35%) and/or methylene blue (MB), with or without light irradiation (LI); the absorbance of MB was the bleaching indicator. Color analysis was performed on bovine teeth (n=12) using two different concentrations of H2 O2 , 6 and 35% associated with titanium dioxide (TiO2 ). Data were analyzed with one and two-way ANOVA, and significance level of p<0...
November 17, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/30416913/impact-of-the-anodization-time-on-the-photocatalytic-activity-of-tio-2-nanotubes
#2
Jesús A Díaz-Real, Geyla C Dubed-Bandomo, Juan Galindo-de-la-Rosa, Luis G Arriaga, Janet Ledesma-García, Nicolas Alonso-Vante
Titanium oxide nanotubes (TNTs) were anodically grown in ethylene glycol electrolyte. The influence of the anodization time on their physicochemical and photoelectrochemical properties was evaluated. Concomitant with the anodization time, the NT length, fluorine content, and capacitance of the space charge region increased, affecting the opto-electronic properties (bandgap, bathochromic shift, band-edge position) and surface hydrophilicity of TiO2 NTs. These properties are at the origin of the photocatalytic activity (PCA), as proved with the photooxidation of methylene blue...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/30388437/comparison-between-a-low-voltage-benchtop-electron-microscope-and-conventional-tem-for-number-size-distribution-of-nearly-spherical-shape-constituent-particles-of-nanomaterial-powders-and-colloids
#3
C Dazon, B Maxit, O Witschger
Nanomaterial powders and colloids are already a large industry and are expected to continue to grow rapidly. In the context of risk assessment associated with nanomaterials, characterization of nanoparticle size and morphology is required. Until now, the best method giving direct access to these parameters has been electron microscopy (EM), in particular, transmission electron microscopy (TEM). Although this method is widely used, several issues are highlighted such as cost, maintenance, sample representativity and damage for sensitive materials...
September 15, 2018: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/30372037/single-molecule-discrimination-of-labeled-dnas-and-polypeptides-using-photoluminescent-free-tio-2-nanopores
#4
Rui Wang, Tal Gilboa, Jiaxi Song, Diana Huttner, Mark W Grinstaff, Amit Meller
Multicolor fluorescence substantially expands the sensing capabilities of nanopores by complementing or substituting the resistive pulsing signals. However, to date single-fluorophore detection in multiple color channels has proven to be challenging primarily due to high photoluminescence (PL) emanating from the silicon nitride (SiN x ) membrane. We hypothesize that the high bandgap of titanium oxide (TiO2 ) would eliminate the PL background when used as a substrate for a nanopore, and hence enable individual fluorophore sensing during the fast passage of biomolecules through the pore...
November 27, 2018: ACS Nano
https://www.readbyqxmd.com/read/30370484/naringenin-mitigates-titanium-dioxide-tio-2-induced-chronic-arthritis-in-mice-role-of-oxidative-stress-cytokines-and-nf%C3%AE%C2%BAb
#5
Marília F Manchope, Nayara A Artero, Victor Fattori, Sandra S Mizokami, Dimitrius L Pitol, João P M Issa, Sandra Y Fukada, Thiago M Cunha, José C Alves-Filho, Fernando Q Cunha, Rubia Casagrande, Waldiceu A Verri
OBJECTIVE: To evaluate the effect and mechanisms of naringenin in TiO2 -induced chronic arthritis in mice, a model resembling prosthesis and implant inflammation. TREATMENT: Flavonoids are antioxidant and anti-inflammatory molecules with important anti-inflammatory effect. Mice were daily treated with the flavonoid naringenin (16.7-150 mg/kg, orally) for 30 days starting 24 h after intra-articular knee injection of 3 mg of TiO2 . METHODS: TiO2 -induced arthritis resembles cases of aseptic inflammation induced by prosthesis and/or implants...
December 2018: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
https://www.readbyqxmd.com/read/30352318/blue-tio-2-nanosheets-as-a-high-performance-electrode-material-for-supercapacitors
#6
Parthiban Pazhamalai, Karthikeyan Krishnamoorthy, Vimal Kumar Mariappan, Sang-Jae Kim
We are reporting the use of blue titanium oxide (b-TiO2 ) nanostructures as advanced electrode material for high performance supercapacitor for the first time. A one-pot hydrothermal route was employed for the oxidation of layered titanium diboride (TiB2 ) into b-TiO2 nanosheets. The b-TiO2 nanosheets are prepared via hydrothermal oxidation of TiB2 . Physico-chemical characterizations such as X-ray diffraction, UV-visible, photoluminescence spectroscopy, electron spin resonance spectroscopy, laser Raman spectrum, X-ray photoelectron spectroscopy, and morphological studies revealed the formation of sheet-like b-TiO2 nanostructures...
February 15, 2019: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30341376/mechano-synthesized-orange-tio-2-shows-significant-photocatalysis-under-visible-light
#7
Ken-Ichi Saitow, Yufeng Wang, Shintaro Takahashi
Nitrogen and carbon co-doped TiO2 particles with a brilliant yellow-orange color were produced mechanochemically by high-energy ball milling as one-pot synthesis. This facile synthesis required only grinding TiO2 with melamine at room temperature. Using monochoromatic lights with the same intensity in visible and UV, the photocatalytic activity of the TiO2 particles was accurately evaluated with respect to the degradation of an aqueous dye (methylene blue) solution. The activities under visible light (450 and 500 nm) were, respectively, 4 and 2 times higher than that of the unmilled TiO2 under UV light (377 nm), corresponding to 9 and 5 times higher than the UV under the solar light condition...
October 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30321808/a-recyclable-nanosheet-of-mo-n-doped-tio-2-nanorods-decorated-on-carbon-nanofibers-for-organic-pollutants-degradation-under-simulated-sunlight-irradiation
#8
Jinli Qiu, Fuqiang Liu, Cailiang Yue, Chen Ling, Aimin Li
A novel nanosheet of Mo/N-codoped TiO2 nanorods immobilized on carbon nanofibers (MNTC nanosheet) was self-synthesized through two facile steps. The Mo/N-doped TiO2 nanorods dispersed through in situ growth on the network constructed by long and vertical carbon nanofibers (CNFs). The fabricated MNTC nanosheet displayed superb photocatalytic activity of methylene blue (MB), and the degradation ratio by the MNTC nanosheet was nearly twice than that of pure nanoparticles. The photocatalytic activities during the degradation process in the presence of environmental media such as inorganic salts and natural organic matter (NOM) were also determined...
January 2019: Chemosphere
https://www.readbyqxmd.com/read/30316152/sewage-sludge-derived-tio-2-fe-fe-3-c-biochar-composite-as-an-efficient-heterogeneous-catalyst-for-degradation-of-methylene-blue
#9
Md Manik Mian, Guijian Liu
Novel TiO2 /Fe/Fe3 C-biochar composite, as a heterogeneous catalyst, has been synthesized by a single-step route, where sewage sludge (SS) and different ratios of nanoparticles (NPs: Fe and Ti) impregnated with chitosan using coagulation and flocculation techniques for subsequent thermal decomposition at 800 °C. The physiochemical properties of samples have been characterized thoroughly and employed in methylene blue (MB) degradation tests. It was found that NPs ratio and chitosan support have significant influences on the properties and catalytic activity of catalysts...
January 2019: Chemosphere
https://www.readbyqxmd.com/read/30312950/effect-of-phase-composition-on-the-photocatalytic-activity-of-titanium-dioxide-obtained-from-supercritical-antisolvent
#10
Elisangela P Da Silva, Manuel E G Winkler, Willyan M Giufrida, Lucio Cardozo-Filho, Christian G Alonso, Jardel B O Lopes, Adley F Rubira, Rafael Silva
Photocatalytic activity of TiO2 nanoparticles is highly dependent on their phase composition. The coexistence of anatase and rutile phases in a single nanoparticle eases the electron transfer process between the phases, and favors the separation of photogenerated pairs. In this work, highly photoactive mixed-phase TiO2 nanostructures were prepared by supercritical antisolvent precipitation (SAS), an environmentally friendly technology. It is shown here that this methodology has the remarkable ability to produce highly porous (515 m2 /g) and crystalline TiO2 nanoparticles...
February 1, 2019: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30279571/surfactant-organic-solvent-free-single-step-engineering-of-hybrid-graphene-pt-tio-2-nanostructure-efficient-photocatalytic-system-for-the-treatment-of-wastewater-coming-from-textile-industries
#11
Zafar Khan Ghouri, Khaled Elsaid, Ahmed Abdala, Saeed Al-Meer, Nasser A M Barakat
In this study, hybrid graphene-Pt/TiO2 nanostructure were synthesized by single-step, inexpensive and surfactant/organic solvent free route; hydrothermal technique. The physicochemical properties of hybrid graphene-Pt/TiO2 nanostructure were carefully analyzed by multiple techniques, including X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). The synthesized hybrid nanostructures were utilized as photocatalyst for the degradation of methylene blue (MB) dye under natural environment at average ambient temperature and mean daily global solar radiation, of about 22-25 °C and 374...
October 2, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30274090/effect-of-uv-radiation-and-chitosan-coating-on-the-adsorption-photocatalytic-activity-of-tio-2-particles
#12
Agata Gozdecka, Agnieszka E Wiącek
The effect of chitosan, pH and UV-VIS radiation on the adsorption-photocatalytic properties of TiO2 dispersion was investigated on the basis of electrophoretic mobility, as well as spectrophotometric and dynamic light scattering measurements. For the degradation efficiency tests two different dyes: the cationic - methylene blue and the anionic - sunset yellow were used. The stability and photodegradation experiments were performed by varying the parameters: wavelength of light (range 450-750 nm), type and radiation time (UV and VIS; 0-5 h), pH (3 and 6) and pigment concentration (0...
December 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/30273480/antibacterial-surface-coating-for-bone-scaffolds-based-on-the-dark-catalytic-effect-of-titanium-dioxide
#13
David Wiedmer, Chen Cui, Florian Weber, Fernanda C Petersen, Hanna Tiainen
Biomaterials which promote tissue integration and resist microbial colonisation are required in bone tissue engineering to prevent biomaterial-associated infections. Surface modification of established materials for bone tissue engineering, such as TiO2 , have emerged as promising anti-infective strategies. Interestingly, the antibacterial activity of TiO2 in the form of particles can be enhanced by combining it with H2 O2 , even in the absence of irradiation. However, it remains unknown whether TiO2 surfaces elicit a similar effect...
October 24, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30265130/toxicity-assessment-of-six-titanium-dioxide-nanoparticles-in-human-epidermal-keratinocytes
#14
Leshuai W Zhang, Nancy A Monteiro-Riviere
PURPOSE: The aim of this study was to evaluate and compare the toxicity of six different types of titanium dioxide (TiO2 ) nanoparticles (NP) on human epidermal keratinocytes (HEK). MATERIALS AND METHODS: Six TiO2 NP (A (10nm), A*(32nm), B (27.5nm), C (200nm), C*(30-40nm) and D*(200-400nm)) were suspended in water or culture medium, and characterized by transmission electron microcopy (TEM) and dynamic light scattering (DLS). In addition, these NP were assayed with cell viability, cytokine release and cellular uptake in HEK...
September 28, 2018: Cutaneous and Ocular Toxicology
https://www.readbyqxmd.com/read/30244739/fabrication-and-photocatalytic-activity-of-tio-2-composite-membranes-via-simultaneous-electrospinning-and-electrospraying-process
#15
Taddao Pahasup-Anan, Kowit Suwannahong, Wipada Dechapanya, Ratthapol Rangkupan
In present study, a simultaneous electrospinning and electrospraying (SEE) process was employed to produce microclusters of TiO2 nanoparticles and interlock them in nanofibrous network. The photocatalytic composite membranes (PCMs) were fabricated by electrospraying TiO2 nanoparticle suspension into microcluster form that dispersed and entrapped within nylon-6 electrospun fiber membrane. Three PCMs membrane with TiO2 content of 52.0, 83.6, and 91.7wt.% were successfully fabricated. The membrane consisted of TiO2 microclusters, ranging in sizes from around 0...
October 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30242357/in-vitro-amoebicidal-activity-of-titanium-dioxide-uv-a-combination-against-acanthamoeba
#16
Gabrielle Gomart, Julie Denis, Tristan Bourcier, Anne Dory, Ahmed Abou-Bacar, Ermanno Candolfi, Arnaud Sauer
Purpose: To assess the amoebicidal effect of titanium dioxide (TiO2)/UV-A combination against Acanthamoeba sp trophozoites and cysts. Methods: The amoebicidal effect of the TiO2/UV-A combination was tested on trophozoites and cysts of clinical isolates of Acanthamoeba hatchetti and Acanthamoeba sp genotype T4, obtained from two severe cases of ulcerative keratitis. Samples of cultured Acanthamoeba were transferred to a 96-well plate. We tested the effect of sterile water (blank control), TiO2 alone, UV-A alone, TiO2 and additional UV-A exposure, chlorhexidine 0...
September 4, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/30196196/enhanced-photocatalytic-performance-of-ag-tio-2-nanohybrid-sensitized-by-black-phosphorus-nanosheets-in-visible-and-near-infrared-light
#17
Xin Wang, Yuren Xiang, Benqing Zhou, Youming Zhang, Jiatao Wu, Rui Hu, Liwei Liu, Jun Song, Junle Qu
The efficient utilization of solar energy for environmental cleaning has attracted great attention, where the key is to efficiently harvest the visible and near-infrared (NIR) light which occupies approximately 95% of the solar light energy. Recently, black phosphorus (BP), as a new staring 2D material, has been extensively studied as photocatalytic materials due to its broad light absorption and tunable bandgap. Herein, we report a novel ternary nanocomposite, BP-Ag/TiO2 , prepared through controlled deposition of Ag clusters on the surface of TiO2 nanocrystals and then incorporated to BP nanosheets...
January 15, 2019: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30189946/enhanced-visible-light-photocatalytic-decolorization-of-methylene-blue-by-hierarchical-ternary-nanocomposites-cu-tio%C3%A2-mesoporous-silica-microsphere
#18
Manchao Wang, Lin Peng, Jiahui Wang, Changqing Li, Lihao Guan, Yuqing Lin
In this study, hierarchical ternary nanocomposites, i.e., Cu-TiO2-mesoporous silica microspheres (Cu-TiO2-MSM), were synthesized as ternary photocatalyst system to improve the visible light photocatalytic degradation of the environmental pollutant model dye methylene blue (MB). The innovation of this method is in situ depositing TiO2 and Cu2O nanoparticles sequentially onto the surface of mesoporous silica microspheres to form highly active heterostructure. The improved activity for the degradation of MB is attributed to: (1) the high adsorption capacity of the porous and interconnected-channel-structure MSM to MB; (2) the valence band electrons of TiO2 released from the conduction band generating abundant highly active free radicals, which directly reacted with adsorbed MB...
December 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30188136/microfluidic-production-of-poly-1-6-hexanediol-diacrylate-based-polymer-microspheres-and-bifunctional-microcapsules-with-embedded-tio-2-nanoparticles
#19
Ruqaiya Al Nuumani, Guido Bolognesi, Goran T Vladisavljević
Application of TiO2 as a photocatalyst and UV protector is restricted by the difficulties in the recovery of TiO2 nanoparticles after water treatment. In this work, TiO2 nanoparticles (Degussa P25) were immobilised within easily recoverable poly(1,6-hexanediol diacrylate) poly(HDDA)-based polymer microspheres produced by on-the-fly photopolymerization of microfluidically generated droplets. Because of fast polymerization reaction, TiO2 was uniformly distributed within the polymer network. The transformation of double bonds in terminal vinyl groups of HDDA monomer into single bonds during photopolymerization was confirmed by Fourier transform infrared spectroscopy...
October 2, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30182431/silver-doped-tio-2-coated-cotton-fabric-as-an-effective-photocatalytic-system-for-dye-decolorization-in-uv-and-visible-light
#20
Anu Mishra, Bhupendra Singh Butola
In this study, titanium tetra-isopropoxide was used as a precursor of TiO2 for in situ coating on cotton fabric by sol-gel method. Subsequently, silver nitrate was used as doping agent to prepare silver-doped TiO2 -coated cotton fabric during hydrothermal treatment. The treated samples were characterized through field-emission scanning electron microscopy, energy-dispersive X-ray analysis, inductively coupled plasma-mass spectroscopy and UV-visible absorption spectroscopy to study morphology, composition of deposited elements and light absorption behavior of treated samples...
September 5, 2018: Photochemistry and Photobiology
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