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https://www.readbyqxmd.com/read/28454020/toxicity-of-tio2-in-nanoparticle-or-bulk-form-to-freshwater-and-marine-microalgae-under-visible-light-and-uv-a-radiation
#1
M Sendra, I Moreno-Garrido, M P Yeste, J M Gatica, J Blasco
Use of titanium dioxide nanoparticles (TiO2 NPs) has become a part of our daily life and the high environmental concentrations predicted to accumulate in aquatic ecosystems are cause for concern. Although TiO2 has only limited reactivity, at the nanoscale level its physico-chemical properties and toxicity are different compared with bulk material. Phytoplankton is a key trophic level in fresh and marine ecosystems, and the toxicity provoked by these nanoparticles can affect the structure and functioning of ecosystems...
April 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28449549/fabrication-of-tio2-nanosheet-aarrays-graphene-cu2o-composite-structure-for-enhanced-photocatalytic-activities
#2
Jinzhao Huang, Ke Fu, Xiaolong Deng, Nannan Yao, Mingzhi Wei
TiO2 NSAs/graphene/Cu2O was fabricated on the carbon fiber to use as photocastalysts by coating Cu2O on the graphene (G) decorated TiO2 nanosheet arrays (NSAs). The research focus on constructing the composite structure and investigating the reason to enhance the photocatalytic ability. The morphological, structural, and photocatalytic properties of the as-synthesized products were characterized. The experimental results indicate that the better photocatalytic performance is ascribed to the following reasons...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28449282/organotitania-based-nanostructures-as-a-suitable-platform-for-the-implementation-of-binary-ternary-and-fuzzy-logic-systems
#3
Andrzej Blachecki, Justyna Mech-Piskorz, Marta Gajewska, Krzysztof Mech, Kacper Pilarczyk, Konrad Szacilowski
Titanium dioxide nanocomposites were synthesized in hierarchical architectures with the use of 1,4-dihydroxyanthraquinone photosensitizer. In the first step, the dye was either incorporated into the TiO2 core or adsorbed on its surface. In the subsequent phase, both structures were covered with an outer layer of titanium dioxide. The structure, morphology, aggregation, spectroscopic and electrochemical properties of the synthesized TiO2-based materials are presented with a special emphasis on the photosensitization and the photocurrent switching phenomena which are also discussed within the context of the optical logic gates implementation and fuzzy logic systems operation...
April 27, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28448902/surface-modified-tio2-nanoparticles-with-ascorbic-acid-antioxidant-properties-and-efficiency-against-dna-damage-in-vitro
#4
Vladan Bajić, Biljana Spremo-Potparević, Lada Živković, Andrea Čabarkapa, Jelena Kotur-Stevuljević, Esma Isenović, Dušan Sredojević, Ivana Vukoje, Vesna Lazić, S Phillip Ahrenkiel, Jovan M Nedeljković
The antigenotoxic and antioxidative properties of surface-modified TiO2 nanoparticles (NPs) with ascorbic acid (AA) were compared with those of constituents (free AA and bare TiO2 NPs). Colloids consisting of the TiO2 NPs with anatase crystal structure were prepared by acidic hydrolysis of TiCl4. The synthesized TiO2 NPs were characterized using transmission electron microscopy and X-ray diffraction analysis. The charge transfer (CT) complex formation between surface Ti atoms and AA is indicated by immediate appearance of red color...
April 14, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28448901/tailoring-of-tio2-films-by-h2so4-treatment-and-uv-irradiation-to-improve-anticoagulant-ability-and-endothelial-cell-compatibility
#5
Yuzhen Liao, Linhua Li, Jiang Chen, Ping Yang, Ansha Zhao, Hong Sun, Nan Huang
Surfaces with dual functions that simultaneously exhibit good anticoagulant ability and endothelial cell (EC) compatibility are desirable for blood contact materials. However, these dual functions have rarely been achieved by inorganic materials. In this study, titanium dioxide (TiO2) films were treated by sulphuric acid (H2SO4) and ultraviolet (UV) irradiation successively (TiO2H2SO4-UV), resulting in good anticoagulant ability and EC compatibility simultaneously. We found that UV irradiation improved the anticoagulant ability of TiO2 films significantly while enhancing EC compatibility, though not significantly...
April 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28447795/chemisorbed-and-physisorbed-water-at-the-tio2-water-interface
#6
Saman Hosseinpour, Fujie Tang, Fenglong Wang, Ruth Ackerman Livingstone, Simon J Schlegel, Tatsuhiko Ohto, Mischa Bonn, Yuki Nagata, Ellen H G Backus
The interfacial structure of water in contact with TiO2 is the key to understand the mechanism of photocatalytic water dissociation as well as photoinduced superhydrophilicity. We investigate the interfacial molecular structure of water at the surface of anatase TiO2, using phase sensitive sum frequency generation spectroscopy together with spectra simulation using ab-initio molecular dynamic trajectories. We identify two oppositely oriented, weakly and strongly hydrogen-bonded sub-ensembles of O-H groups at the superhydrophilic UV-irradiated TiO2 surface...
April 27, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28447695/phase-transformation-of-tio2-nanoparticles-by-femtosecond-laser-ablation-in-aqueous-solutions-and-deposition-on-conductive-substrates
#7
Paola Russo, Robert Liang, Rui Xiu He, Y Norman Zhou
Titanium dioxide (TiO2) is a wide bandgap semiconductor that is chemically stable, non-toxic, and economical compared to other semiconductors and has been implemented in a wide range of applications such as photocatalysis, photovoltaics, and memristors. In this work we studied the femtosecond laser ablation of titanium dioxide powders (P25) dispersed either in water or deposited onto a fluoride-doped tin oxide (FTO) substrate. The process was used as a route to induce the phase-transformation of TiO2 nanoparticles which was governed by laser parameters such as ablation time and power...
April 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28447078/controllable-nanothorns-on-tio2-mesocrystals-for-efficient-charge-separation-in-hydrogen-evolution
#8
Peng Zhang, Sooyeon Kim, Mamoru Fujitsuka, Tetsuro Majima
Herein, we investigated that sheet-like TiO2 mesocrystals with controllable nanothorns on the {101} facet during the topotactic transformation exhibit facet-induced charge separation and anisotropic electron flow, realizing the superior facet-dependent photocatalysis in solar energy conversion.
April 27, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28445067/photoelectrochemical-degradation-of-organic-compounds-coupled-with-molecular-hydrogen-generation-using-electrochromic-tio2-nanotube-arrays
#9
Min Seok Koo, Kangwoo Cho, Jeyong Yoon, Wonyong Choi
Vertically aligned TiO2 nanotube arrays (TNTs) were prepared by electrochemical anodization, and then cathodically polarized with dark blue coloration for the dual-functional photoelectrochemical water treatment of organic substrates degradation and accompanying H2 generation. The resulting Blue-TNTs (inner diameter: ~40 nm; length: ~9 μm) showed negligible shift in X-ray diffraction pattern compared with the intact TNTs, but the X-ray photoelectron spectra indicated a partial reduction of Ti(4+) to Ti(3+) on the surface...
April 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28444717/effect-of-donor-strength-and-bulk-on-thieno-3-4-b-pyrazine-based-panchromatic-dyes-in-dscs
#10
Nalaka P Liyanage, Hammad Cheema, Alexandra R Baumann, Alexa R Zylstra, Jared Heath Delcamp
NIR absorbing organic dyes are critically needed in dye-sensitized solar cells (DSCs). Thieno[3,4-b]pyrazine (TPz) based dyes can access the near-infrared (NIR) spectral region and show power conversion efficiencies (PCEs) of up to 8.1% with sunlight being converted at wavelengths up to 800 nm for 17.6 mA/cm2 of photocurrent in a co-sensitized DSC device. Precisely controlling dye excited-state energies is critical for good performances in NIR DSCs. Strategies to control TPz dye energetics with stronger donor groups and TPz substituent choice are evaluated in this manuscript...
April 25, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28444573/the-effect-of-different-types-of-nanoparticles-on-fus-and-tdp-43-solubility-and-subcellular-localization
#11
Jasna Lojk, Sonja Prpar Mihevc, Vladimir Boštjan Bregar, Mojca Pavlin, Boris Rogelj
Increased environmental pollution has been suggested as one of the possible causes for increased incidence of neurodegenerative and developmental disorders. Through the environmental pollution, everyday consumer products and nanomedical applications, we are also exposed to various nanoparticles (NPs). Specific types of NPs have been shown to be able to cause neural damage in vivo through processes such as disruption of the blood-brain barrier, induction of neuroinflammation, increase in oxidative stress and protein aggregation...
April 25, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28444073/antibacterial-activity-of-standard-and-n-doped-titanium-dioxide-coated-endotracheal-tubes-an-in-vitro-study
#12
Valentina Caratto, Lorenzo Ball, Elisa Sanguineti, Angelo Insorsi, Iacopo Firpo, Stefano Alberti, Maurizio Ferretti, Paolo Pelosi
Objective: The aim of this study was to assess the antibacterial activity against Staphylococcus aureus and Pseudomonas aeruginosa of two nanoparticle endotracheal tube coatings with visible light-induced photocatalysis. Methods: Two types of titanium dioxide nanoparticles were tested: standard anatase (TiO2) and N-doped TiO2 (N-TiO2). Nanoparticles were placed on the internal surface of a segment of commercial endotracheal tubes, which were loaded on a cellulose acetate filter; control endotracheal tubes were left without a nanoparticle coating...
January 2017: Revista Brasileira de Terapia Intensiva
https://www.readbyqxmd.com/read/28443911/fabrication-of-plasmonic-au-pd-alloy-nanoparticles-for-photocatalytic-suzuki-miyaura-reactions-under-ambient-conditions
#13
Dongxu Han, Zongbi Bao, Huabin Xing, Yiwen Yang, Qilong Ren, Zhiguo Zhang
The Suzuki-Miyaura reaction is one of the most popular and efficient routes for the formation of carbon-carbon bonds in both laboratorial and industrial synthetic processes. Here, we report for the first time that a Au-Pd/TiO2 catalyst could be utilized efficiently for Suzuki-Miyaura reactions at ambient conditions under visible light with high activity and reusability. Mechanistic investigation by means of experimental methods revealed that through the strong local surface plasma resonance of Au under the visible light, the hot electrons of Au could be injected into Pd in the bimetallic nanoparticles, thus facilitating activation of the aryl halides...
April 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28443909/effect-of-the-calcination-temperature-on-the-photocatalytic-efficiency-of-acidic-sol-gel-synthesized-tio2-nanoparticles-in-the-degradation-of-alprazolam
#14
Andreia Romeiro, Diana Freitas, M Emília Azenha, Moisés Canle, Hugh D Burrows
We report a comparative study on the photodegradation of the widely used benzodiazepine psychoactive drug alprazolam (8-chloro-1-methyl-6-phenyl-4H-[1,2,4]triazolo[4,3-a][1,4]benzodiazepine, ALP) using direct photolysis, and titanium dioxide photocatalyzed reaction. Titanium dioxide photocatalysts were prepared as nanoparticles by acidic sol-gel methods, calcined at two different temperatures, and their behavior compared with P25 (Degussa type) TiO2. Efficient photodegradation was observed in the photocatalytic process, with over 90% degradation after 90 minutes under optimized conditions...
April 26, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28443902/an-internal-magnetic-field-strategy-to-reuse-pulverized-active-materials-for-high-performance-a-magnetic-three-dimensional-ordered-macroporous-tio2-copt-%C3%AE-fe2o3-nanocomposite-anode
#15
Yiping Tang, Liang Hong, Jiquan Li, Guangya Hou, Huazhen Cao, Liankui Wu, Guoqu Zheng, Qingliu Wu
A ferromagnetic three-dimensional ordered macroporous TiO2/CoPt/α-Fe2O3 (3DOMTCF) nanocomposite was synthesized via a sol-gel approach templated by poly(methyl methacrylate) (PMMA) microspheres. After magnetization, it exhibited an extremely high reversible capacity and a long cycle life, which were ascribed to the internal magnetic field for reusing pulverized active materials and its unique structure.
April 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28443660/assessing-the-risk-of-engineered-nanomaterials-in-the-environment-development-and-application-of-the-nanofate-model
#16
Kendra L Garner, Sangwon Suh, Arturo A Keller
We developed a dynamic multimedia fate and transport model (nanoFate) to predict the time-dependent accumulation of metallic engineered nanomaterials (ENMs) across environmental media. nanoFate considers a wider range of processes and environmental sub-compartments than most previous models and considers ENM releases to compartments (e.g. urban, agriculture) in a manner that reflects their different patterns of use and disposal. As an example, we simulated ten years of release of nano CeO2, CuO, TiO2, and ZnO in the San Francisco Bay area...
April 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28442908/antibacterial-activity-and-cytocompatibility-of-an-implant-coating-consisting-of-tio2-nanotubes-combined-with-a-gl13k-antimicrobial-peptide
#17
Tao Li, Na Wang, Su Chen, Ran Lu, Hongyi Li, Zhenting Zhang
Prevention of implant-associated infections at an early stage of surgery is highly desirable for the long-term efficacy of implants in dentistry and orthopedics. Infection prophylaxis using conventional antibiotics is becoming less effective due to the development of bacteria resistant to multiple antibiotics. An ideal strategy to conquer bacterial infections is the local delivery of antibacterial agents. Therefore, antimicrobial peptide (AMP) eluting coatings on implant surfaces is a promising alternative...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28442768/synergistic-effect-of-nitrate-doped-tio2-aerosols-on-the-fast-photochemical-oxidation-of-formaldehyde
#18
Jing Shang, Wei Wei Xu, Chun Xiang Ye, Christian George, Tong Zhu
The uptake of formaldehyde (HCHO) on mineral dust affects its budget as well as particle properties, yet the process has not yet been fully investigate. Here, TiO2 and nitrate-doped TiO2 aerosols were used as proxies for mineral dust, and the uptake of HCHO was explored in a chamber under both dark and illuminated conditions. The uptake loss of HCHO on UV-illuminated aerosols is 2-9 times faster than its gaseous photolysis in our experimental system. The uptake coefficient in the range of 0.43-1.68 × 10(-7) is 1-2 orders of magnitude higher than previous reports on model mineral dust particles...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28441594/cotransport-of-human-adenoviruses-with-clay-colloids-and-tio2-nanoparticles-in-saturated-porous-media-effect-of-flow-velocity
#19
Vasiliki I Syngouna, Constantinos V Chrysikopoulos, Petros Kokkinos, Maria A Tselepi, Apostolos Vantarakis
This study focuses on the effects of two clay colloids (kaolinite, KGa-1b and montmorillonite, STx-1b) and titanium dioxide (TiO2) nanoparticles (NPs) on human adenovirus transport and retention in water saturated porous media at three different pore water velocities (0.38, 0.74, and 1.21cm/min). Transport and cotransport experiments were performed in 30-cm long laboratory columns packed with clean glass beads with 2mm diameter. The experimental results suggested that the presence of KGa-1b, STx-1b and TiO2 NPs increased human adenovirus inactivation and attachment onto the solid matrix, due to the additional attachment sites available...
April 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28440617/anchoring-tailored-low-index-faceted-biobr-nanoplates-onto-tio2-nanorods-to-enhance-the-stability-and-visible-light-driven-catalytic-activity
#20
Chao Xue, Tianxi Zhang, Shujiang Ding, Jinjia Wei, Guidong Yang
In this work, a fantastic one-dimensional (1D) BiOBr/TiO2 nanorods (NRs) heterojunction composite was rationally proposed and designed from the perspective of molecular and interface engineering. The fabricated intimately connected interfacial heterojunction between two-dimensional (2D) BiOBr nanoplates and 1D TiO2 NRs acts as the interfacial nano-channel to promote efficient interfacial charge migration and the separation of photogenerated electron-hole pairs. As a result, 1D BiOBr/TiO2 NRs heterojunctions exhibited outstanding visible-light photocatalytic activities and sustained cycling performance...
April 25, 2017: ACS Applied Materials & Interfaces
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