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https://www.readbyqxmd.com/read/28212518/zno-tio2-composites-for-photocatalytic-inactivation-of-escherichia-coli
#1
Diptipriya Sethi, Ramasamy Sakthivel
ZnO/TiO2 composite was synthesized from zinc nitrate and anatase TiO2 by using the incipient wet impregnation method followed by calcination at 350°C for 3h. These samples were characterized through several characterization techniques. XRD peaks confirms the presence of single anatase phase of titania in the 3 and 6wt% ZnO/TiO2 composite, whereas in all other composites both anatase titania and zinc oxide phases were found. UV-visible (diffuse) reflectance spectra show titania and ZnO absorbs in the ultraviolet (UV) region whereas ZnO/TiO2 absorbs both UV and visible light...
February 11, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28212513/simultaneous-removal-of-no-and-hg-0-over-ce-cu-modified-v2o5-tio2-based-commercial-scr-catalysts
#2
Guilong Chi, Boxiong Shen, Ranran Yu, Chuan He, Xiao Zhang
A series of novel Ce-Cu modified V2O5/TiO2 based commercial SCR catalysts were prepared via ultrasonic-assisted impregnation method for simultaneous removal of NO and elemental mercury (Hg(0)). Nitrogen adsorption, X-ray diffraction (XRD), temperature programmed reduction of H2 (H2-TPR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the catalysts. 7% Ce-1% Cu/SCR catalyst exhibited the highest NO conversion efficiency (>97%) at 200-400°C, as well as the best Hg(0) oxidation activity (>75%) at 150-350°C among all the catalysts...
February 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28212500/cyto-genotoxic-and-dna-methylation-changes-induced-by-different-crystal-phases-of-tio2-np-in-bronchial-epithelial-16-hbe-cells
#3
Manosij Ghosh, Deniz Öner, Radu-Corneliu Duca, Stevan M Cokic, Sven Seys, Stef Kerkhofs, Kirsten Van Landuyt, Peter Hoet, Lode Godderis
With the increase in use of TiO2-np, a better understanding of their safety is important. In the present study the effect of different crystal phases of TiO2-np (anatase, rutile and anatase: rutile mixture; 20-26nm) were studied for cyto-genotoxicity and global DNA methylation and hydroxymethylation. Cytotoxic response was observed at a concentration of 25μg/ml for the particles tested. Results of comet and micronucleus (with and without CytB) assays revealed significant genotoxic effect of these particles...
February 10, 2017: Mutation Research
https://www.readbyqxmd.com/read/28211998/nanojoint-formation-between-ceramic-titanate-nanowires-and-spot-melting-of-metal-nanowires-with-electron-beam
#4
Arixin Bo, Jose Alarco, Huaiyong Zhu, Eric R Waclawik, Haifei Zhan, YuanTong Gu
Construction of nano-architectures requires techniques like joint formation and trimming. For ceramic materials, however, it is extremely difficult to form nanojoints by conventional methods like merging. In this work, we demonstrate that ceramic titanate nanowires (NWs) can be joined by spot melting under electron beam (e-beam) irradiation (EBI). The irradiation fuses the contacted spot of titanate NWs yielding an intact nanojoint. Nanojoints with different morphologies can be produced. The joint structures consist of titanium dioxide (TiO2) rutile, anatase and titanate phases in direction away from the e-beam melting spot...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211360/the-effect-of-silica-thickness-on-nano-tio2-particles-for-functional-polyurethane-nanocomposites
#5
Chao Chen, Wei Wu, William Z Xu, Paul A Charpentier
In order to help reduce the agglomeration of TiO2 nanoparticles in polyurethane coatings while enhancing their photoactivity and mechanical/physical properties, this work examined encapsulating TiO2 nanoparticles in a thin layer of SiO2, prior to their nanocomposite polymerization. By applying a Stöber process, varying thicknesses of SiO2 were successfully coated onto the surface of anatase and rutile TiO2 nanoparticles. The methylene blue results showed that different loadings of SiO2 onto the TiO2 surface significantly influenced their photocatalytic activity...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28210434/effect-of-the-tio2-nanoparticles-on-the-selected-physical-properties-of-mineral-trioxide-aggregate
#6
Mohammad Samiei, Maryam Janani, Naser Asl-Aminabadi, Negin Ghasemi, Baharak Divband, Sajjad Shirazi, Kayvan Kafili
BACKGROUND: Some of the efforts to improve the properties of Mineral Trioxide Aggregate (MTA) include incorporation of some nanoparticles such as Titanium dioxide (TiO2). The aim of this study was to evaluate the effect of TiO2 nanoparticles on the setting time, working time, push-out bond strength and compressive strength of MTA. MATERIAL AND METHODS: The physical properties to be evaluated were determined using the ISO 6786:2001 and 9917 specifications. Fifteen samples of each material (MTA or MTA with 1% weight ratio of TiO2 Nanoparticles) were prepared for any evaluated physical property...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28210432/biocompatibility-of-mineral-trioxide-aggregate-with-tio2-nanoparticles-on-human-gingival-fibroblasts
#7
Mohammad Samiei, Negin Ghasemi, Marzieh Aghazadeh, Baharak Divband, Farzaneh Akbarzadeh
BACKGROUND: The New compositions of white mineral trioxide aggregate (WMTA) or use of various additives like nanoparticles might affect MTA's ideal characteristics This study was performed to evaluate the cytotoxicity of WMTA and WMTA with Titanium dioxide (TiO2) nanoparticles (1% weight ratio) at different storage times after mixing on human gingival fibroblasts (HGFs). MATERIAL AND METHODS: HGFs were obtained from the attached gingiva of human premolars. HGFs were cultured in Dulbecco's Modified Eagle medium, supplemented with 10% fetal calf serum, penicillin and streptomycin...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28206983/an-immutable-array-of-tio2-nanotubes-to-pressures-over-30-gpa
#8
Yanyan Zhang, Qinglin Wang, Junkai Zhang, Xiaoxin Wu, Yanzhang Ma
We report the successful formation of an immutable array of α-PbO2-phase TiO2 nanotubes by compression of a TiO2 nanotube array in an anatase phase. During compression to 31.3 GPa, the TiO2 nanotubes started to directly transform from an anatase phase to a baddeleyite phase at ~15 GPa and completed the transition at ~23 GPa. Under decompression, the baddeleyite phase transformed to a α-PbO2 phase at 4.6 GPa, which was quenchable to ambient pressure. Notably the tubular array microstructure was retained after the application of ultrahigh pressure and undergoing a series of phase transformations...
February 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28201971/tio2-based-mitoxantrone-imprinted-poly-methacrylic-acid-co-polycaprolctone-diacrylate-nanoparticles-as-a-drug-delivery-system
#9
Maryam Bakhshizadeh, Ameneh Sazgarnia, Mahmoud Seifi, Farzin Hadizadeh, Ghadir Rajabzadeh, Seyed Ahmad Mohajeri
BACKGROUND: Light delivery in photodynamic therapy is a challenging issue in deep cancer treatment. To solve this problem, photosensitizers are conjugated to X-ray luminescent nanoparticles. When the complexes are stimulated by X-rays during radiotherapy, the nanoparticles generate light and activate the photosensitizers. METHODS: Core-shell molecularly imprinted polymers (MIPs) were prepared against mitoxantrone (MX) in which TiO2 nanoparticles were applied as a core, diacrylated polycaprolctone as a biodegradable cross-linker and methacrylic acid (MAA) or 4-vinylpyridin (4-VP) as the functional monomer...
February 14, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28199079/heterogeneous-tio2-v2o5-carbon-nanotube-electrodes-for-lithium-ion-batteries
#10
Mert Kurttepeli, Shaoren Deng, Felix Mattelaer, Daire J Cott, Philippe Vereecken, Jolien Dendooven, Christophe Detavernier, Sara Bals
Vanadium pentoxide (V2O5) is proposed and investigated as a cathode material for lithium ion batteries. However, the dissolution of V2O5 during the charge/discharge remains as an issue at the V2O5-electrolyte interface. In this work, we present a heterogeneous nanostructure with carbon nanotubes supported V2O5/titanium dioxide (TiO2) multilayers as electrodes for thin-film Li-ion batteries. Atomic layer deposition of V2O5 on carbon nanotubes provides enhanced Li storage capacity and high rate performance. An additional TiO2 layer leads to increased morphological stability and in return higher cycling performance of V2O5/carbon nanotubes...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28197943/hydrothermal-synthesized-magnetically-separable-mesostructured-h2ti3o7-%C3%AE-fe2o3-nanocomposite-for-organic-dye-removal-via-adsorption-and-its-regeneration-reuse-through-synergistic-non-radiation-driven-h2o2-activation
#11
Harsha Narayani, Manu Jose, K Sriram, Satyajit Shukla
Hydrogen titanate (H2Ti3O7) nanotubes/nanosheets (HTN) are emerging class of adsorbent material which possess unique property of activating hydrogen peroxide (H2O2) to generate the reactive oxygen species (ROS), such as superoxide radical ions (O2(.-)) and hydroxyl radicals (·OH), effective in the decomposition of surface-adsorbed dye. However, HTN are non-magnetic which create hurdle in their effective separation from the treated aqueous solution. To overcome this issue, magnetic nanocomposites (HTNF) composed of HTN and maghemite (γ-Fe2O3) nanoparticles have been processed by subjecting the core-shell magnetic photocatalyst consisting of γ-Fe2O3/silica (SiO2)/titania (TiO2), having varying amounts of TiO2 in the shell to the hydrothermal conditions...
February 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28197588/an-unexpected-pathway-for-hydrodesulfurization-of-gazole-over-a-comos-active-phase-supported-on-a-mesoporous-tio2-catalyst
#12
I Naboulsi, C Felipe Linares Aponte, B Lebeau, S Brunet, L Michelin, M Bonne, J L Blin
Using dual mesoporous titania as a support, due to the presence of intrinsic Brönsted acid sites, the main approach to 4,6-dimethylbenzothiophene (46DMDBT) hydrodesulfurization (HDS) becomes the direct desulfurization (DDS) route through isomerization and dismutation reactions, instead of the hydrogenation (HYD) pathway usually observed with a conventional promoted (by Ni or Co) MoS2/Al2O3 catalyst.
February 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28195734/bovine-serum-albumin-adsorption-on-tio2-colloids-the-effect-of-particle-agglomeration-and-surface-composition
#13
Augusto Márquez, Thomas Berger, Andrea Feinle, Nicola Huesing, Martin Himly, Albert Duschl, Oliver Diwald
Protein adsorption at nanostructured oxides strongly depends on synthesis conditions and sample history of the material investigated. We measured the adsorption of bovine serum albumin (BSA) to commercial Aeroxide TiO2 P25 nanoparticles in aqueous dispersions. Significant changes in adsorption capacity were induced by mild sample washing procedures and attributed to the structural modification of adsorbed water and surface hydroxyls. Motivated by the lack of information about the sample history of commercial TiO2 nanoparticle samples we used vapor phase grown TiO2 nanoparticles, a well-established model system for adsorption and photo-catalysis studies, and performed on this material for the first time a systematic and quantitative BSA adsorption study...
February 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28195715/interfacial-interaction-of-titania-nanoparticles-and-ligated-uranyl-species-a-relativistic-dft-investigation
#14
Hong-Bo Zhao, Ming Zheng, Georg Schreckenbach, Qing-Jiang Pan
To understand interfacial behavior of actinides adsorbed onto mineral surfaces and unravel their structure-property relationship, the structures, electronic properties, and energetics of various ligated uranyl species adsorbed onto TiO2 surface nanoparticle clusters (SNCs) were examined using relativistic density functional theory. Rutile (110) and anatase (101) titania surfaces, experimentally known to be stable, were fully optimized. For the former, models studied include clean and water-free Ti27O64H20 (dry), partially hydrated (Ti27O64H20)(H2O)8 (sol) and proton-saturated [(Ti27O64H20)(H2O)8(H)2](2+) (sat), while defect-free and defected anatase SNCs involving more than 38 TiO2 units were considered...
February 14, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28195701/synthesis-of-nanoflower-shaped-mxene-derivative-with-unexpected-catalytic-activity-for-dehydrogenation-of-sodium-alanates
#15
Guodong Zou, Baozhong Liu, Jianxin Guo, Qingrui Zhang, Carlos Fernandez, Qiuming Peng
Surface group modification and functionalization of two-dimensional materials in many cases are deemed as effective approaches to achieve some distinctive properties. Herein we present a new nanoflower-shaped TiO2/C composite which was synthesized by in-situ alcoholysis of two-dimensional layered MXene (Ti3C2(OHxF1-x)2) in a dilute HF solution (0.5 wt.%) for the first time. Furthermore, it is demonstrated that it bestows a strong catalytic activity for the dehydrogenation of NaAlH4. The results show that the NaAlH4 containing 10 wt...
February 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28195297/efficient-planar-n-i-p-type-heterojunction-flexible-perovskite-solar-cells-with-sputtered-tio2-electron-transporting-layers
#16
Sawanta S Mali, Chang Kook Hong, A I Inamdar, Hyunsik Im, Sang Eun Shim
The development of hybrid organo-lead trihalide perovskite solar cells (PSCs) comprising an electron transporting layer (ETL), a perovskite light absorber and a hole transporting layer (HTL) has received significant attention for their potential in efficient PSCs. However, the preparation of a compact and uniform ETL and the formation of a uniform light absorber layer suffer from a high temperature processing treatment and the formation of unwanted perovskite islands, respectively. A low temperature/room temperature processed ETL is one of the best options for the fabrication of flexible PSCs...
February 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28194295/preparation-of-tio2-nanotubes-loaded-on-polyurethane-membrane-and-research-on-their-photocatalytic-properties
#17
Longli Lin, Qijun Wu, Xun Gong, Yu Zhang
To solve the problem of separation and recovery of photocatalyst in water, the modification of TiO2 was studied as well as its immobilization and photocatalytic properties. To improve surface properties, TiO2 nanotubes were synthesized by a hydrothermal method and silylated by silane coupling agents to introduce a certain functional group. Supported on polyurethane (PU) membrane, TiO2 nanotubes were prepared to produce immobilized PU/TiO2. Catalysts were characterized and identified by means of Fourier-transform infrared spectroscopy (FTIR), attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR), and scanning electron microscopy (SEM)...
2017: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/28193357/efficient-and-clean-pre-concentration-of-ultra-trace-calcium-channel-blockers-from-biological-matrices-via-a-hyphenated-procedure-of-two-sequential-dispersive-solid-liquid-phase-microextractions
#18
Maryam Hemmati, Maryam Rajabi, Alireza Asghari
In the present work, we propose a safe, simple, and relatively rapid procedure for the efficient clean-up and pre-concentration of ultra-trace calcium channel blockers (CCBs) from the human plasma and urine samples followed by high performance liquid chromatography-ultraviolet detection. The proposed sample preparation method is a combination of two microextraction methods termed as ultrasound-assisted dispersive micro solid-phase extraction coupled with air-agitated liquid-liquid microextraction based on solidification of a floating organic droplet (UA-dμSPE-AA-LLME-SFO)...
April 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28192928/revealing-the-effect-of-protein-weak-adsorption-to-nanoparticles-on-the-interaction-between-the-desorbed-protein-and-its-binding-partner-by-surface-enhanced-infrared-spectroelectrochemistry
#19
Li Liu, Li Zeng, Lie Wu, Xiue Jiang
In recent years, the properties of protein corona have attracted intense interest in the field of nanobio interface, but a long-ignored research issue is how the desorbed proteins suffering from conformational change upon weak association with nanoparticles affect their functional properties when further interacting with their downstream protein partners. In this Article, surface-enhanced infrared absorption spectroscopy (SEIRAS) and electrochemical cyclic voltammetry were used to study the adsorption and redox properties of the soluble cytochrome c (cyt c) on 11-mercaptoundecanoic acid (MUA) self-assembled monolayer (SAM) after weakly binding to and then desorbed from nano-TiO2...
February 13, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28192776/coral-and-nano-qfar-quantitative-feature-activity-relationships-qfar-for-bioavailability-of-nanoparticles-zno-cuo-co3o4-and-tio2
#20
Alla P Toropova, Andrey A Toropov, Danuta Leszczynska, Jerzy Leszczynski
Quantitative feature - activity relationships (QFAR) approach was applied to prediction of bioavailability of metal oxide nanoparticles. ZnO, CuO, Co3O4, and TiO2 nanoxides were considered. The computational model for bioavailability of investigated species is asserted. The model was calculated using the Monte Carlo method. The CORAL free software (http://www.insilico.eu/coral) was used in this study. The developed model was tested by application of three different splits of data into the training and validation sets...
February 10, 2017: Ecotoxicology and Environmental Safety
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