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Ag TiO2

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https://www.readbyqxmd.com/read/28225260/investigation-of-ag-tio2-interfacial-reaction-of-highly-stable-ag-nanowire-transparent-conductive-film-with-conformal-tio2-coating-by-atomic-layer-deposition
#1
Ming-Hua Yeh, Po-Shen Chen, Yi-Ching Yang, Guang-Hong Chen, Hsueh-Shih Chen
The atomic layer deposition (ALD) technique is applied to coat Ag nanowires (NWs) with a highly uniform and conformal TiO2 layer to improve the stability and sustainability of Ag NW transparent conductive films (TCFs) at high temperatures. The TiO2 layer can be directly deposited on Ag NWs with a surface polyvinylpyrrolidone (PVP) coat that acts a bed for TiO2 seeding in the ALD process. The ALD TiO2 layer significantly enhances the thermal stability at least 100 folds when aged between 200-400 °C and also provides an extra function of violet-blue light filtration for Ag NW TCFs...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28224784/a-highly-efficient-electrochemiluminescent-ag-nanoclusters-tio2-nanomaterials-as-signal-probe-for-ferrocene-driven-light-switch-bioanalysis
#2
Ying Zhou, Haijun Wang, Ying Zhuo, Yaqin Chai, Ruo Yuan
In this work, a ferrocene (Fc)-driven light switch biosensor for ultrasensitive detection of amyloid-β (Aβ) was designed by utilizing the highly-efficient electrochemiluminescent nanomaterials of Ag NCs/TiO2 nanoflowers (NFs) as signal labels. Through combining the TiO2 NFs as the co-reaction accelerator and dissolved O2 as the intrinsic co-reactant to in suit generate strong oxidizing intermediate radical OH•, the electrochemiluminescence (ECL) of Ag NCs on the TiO2 NFs surface could be significantly promoted in comparion with that of pure Ag NCs in solution...
February 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28218285/super-hydrophobic-silver-doped-tio2-polycarbonate-coatings-created-on-various-material-substrates-with-visible-light-photocatalysis-for-self-cleaning-contaminant-degradation
#3
Zhengjian Li, Zongzhao Sun, Zhiqiang Duan, Rui Li, Yanli Yang, Jingyi Wang, Xiaoxia Lv, Wei Qi, Hua Wang
In the present work, a facile and efficient fabrication method has been developed for creating super-hydrophobic coatings of silver-doped TiO2@polycarbonate (TiO2 (Ag)@PC) on the substrates of different materials with photocatalytic self-cleaning performances simply by the "dipping and drying" process. The substrates were first patterned with glue and then deposited with the dopamine-capped TiO2 (Ag)@PC (DA-TiO2 (Ag)@PC) nanocomposites, followed by the further etching with dimethylbenzene. The so prepared super-hydrophobic E-DA-TiO2(Ag)@PC coatings could present the lotus leaf-like porous architectures, high adhesion stability, and especially the visible-light photocatalysis for organic contaminant degradation, thus promising the wide outdoor and indoor applications like water proofing, metal erosion protection, and surface self-cleaning...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28218004/synthesis-and-characterization-of-some-abundant-nanoparticles-their-antimicrobial-and-enzyme-inhibition-activity
#4
Shams T Khan, Ajmaluddin Malik, Rizwan Wahab, Omar H Abd-Elkader, Maqusood Ahamed, Javed Ahmad, Javed Musarrat, Maqsood A Siddiqui, Abdulaziz A Al-Khedhairy
Although the antimicrobial activity of the engineered nanoparticles (NPs) is well known, the biochemical mechanisms underlying this activity are not clearly understood. Therefore, four NPs with the highest global production, namely SiO2, TiO2, ZnO, and Ag, were synthesized and characterized. The synthesized SiO2, TiO2, ZnO, and Ag NPs exhibit an average size of 11.12, 13.4, 35, and 50 nm, respectively. The antimicrobial activity of the synthesized NPs against bacteria and fungi were also determined. NPs-mediated inhibition of two very important enzymes, namely urease and DNA polymerase, is also reported...
February 20, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28211998/nanojoint-formation-between-ceramic-titanate-nanowires-and-spot-melting-of-metal-nanowires-with-electron-beam
#5
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/28184157/silver-loaded-nanotubular-structures-enhanced-bactericidal-efficiency-of-antibiotics-with-synergistic-effect-in-vitro-and-in-vivo
#6
Na Xu, Hao Cheng, Jiangwen Xu, Feng Li, Biao Gao, Zi Li, Chenghao Gao, Kaifu Huo, Jijiang Fu, Wei Xiong
Antibiotic-resistant bacteria have become a major issue due to the long-term use and abuse of antibiotics in treatments in clinics. The combination therapy of antibiotics and silver (Ag) nanoparticles is an effective way of both enhancing the antibacterial effect and decreasing the usage of antibiotics. Although the method has been proved to be effective in vitro, no in vivo tests have been carried out at present. Herein, we described a combination therapy of local delivery of Ag and systemic antibiotics treatment in vitro in an infection model of rat...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28157288/envisioning-nano-release-dynamics-in-a-changing-world-using-dynamic-probabilistic-modeling-to-assess-future-environmental-emissions-of-engineered-nanomaterials
#7
Tian Yin Sun, Denise M Mitrano, Nikolaus A Bornhöft, Martin Scheringer, Konrad Hungerbühler, Bernd Nowack
The need for an environmental risk assessment for engineered nanomaterials (ENM) necessitates the knowledge about their environmental emissions. Material flow models (MFA) have been used to provide predicted environmental emissions but most current nano-MFA models consider neither the rapid development of ENM production nor the fact that a large proportion of ENM are entering an in-use stock and are released from products over time (i.e., have a lag phase). Here we use dynamic probabilistic material flow modeling to predict scenarios of the future flows of four ENM (nano-TiO2, nano-ZnO, nano-Ag and CNT) to environmental compartments and to quantify their amounts in (temporary) sinks such as the in-use stock and ("final") environmental sinks such as soil and sediment...
February 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28129621/a-promising-electrode-material-modified-by-nb-doped-tio2-nanotubes-for-electrochemical-degradation-of-ar-73
#8
Li Xu, Gaorui Liang, Ming Yin
A distinctive SnO2Sb electrode with highly ordered Nb doped TiO2 nanotubes sheet as a new substrate, obtained by NbTi alloy anodization, is prepared by pulse electrochemical deposition for the first time as electrocatalytic oxidation anode for wastewater treatment. The novel electrode has a larger surface area and smaller crystallite particles than conventional SnO2Sb electrodes as obtained from the analysis of scanning electron microscopy and X-ray diffraction. Compared with Ti/SnO2Sb and Ti/TiO2-NTs/SnO2Sb prepared by pulse electrochemical deposition, the electrode modified by NbTiO2-NTs has the higher oxygen evolution potential of 2...
January 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28124047/adatom-surface-diffusion-of-catalytic-metals-on-the-anatase-tio2-101-surface
#9
Afnan Alghannam, Christopher L Muhich, Charles B Musgrave
Titanium oxide is often decorated with metal nano-particles and either serves as a catalyst support or enables photocatalytic activity. The activity of these systems degrades over time due to catalytic particle agglomeration and growth by Ostwald ripening where adatoms dissociate from metal particles, diffuse across the surface and add to other metal particles. In this work, we use density functional theory calculations to study the diffusion mechanisms of select group VIII and 1B late-transition metal adatoms commonly used in catalysis and photocatalysis (Au, Ag, Cu, Pt, Rh, Ni, Co and Fe) on the anatase TiO2(101) surface...
January 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28112673/long-term-effect-of-metal-oxide-nanoparticles-on-activated-sludge
#10
Baranidharan Sundaram, Arun Kumar
This study evaluated the influence of metal oxide nanoparticles (NPs) (Ag2O, TiO2) and their mixture on activated sludge for 180 days. When tested, a mixture of NPs at 1 and 10 mg/L had greater impact than individual NPs, in which maximum reduction in chemical oxygen demand (COD) elimination (76.3%) was observed after 150 days for 1 mg/L (500 mg/L COD concentration) and after 180 days (70.2%) for 10 mg/L (250 mg/L COD concentration). TiO2 had higher inhibition on COD reduction than Ag2O NPs at 1 and 10 mg/L...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28111133/meglumine-ant%C3%A4-moniate-tio2-ag-nanoparticle-combinations-reduce-toxicity-of-the-drug-while-enhancing-its-antileishmanial-effect
#11
Emrah Sefik Abamor, Adil M Allahverdiyev, Melahat Bagirova, Miriam Rafailovich
Currently, the treatment of leishmaniasis is increasingly insufficient as current antileishmanial drugs have many disadvantages such as toxic side effects, high cost, and growing drug resistance. In order to overcome these disadvantages, researchers have recently focused on combination therapy by using pentavalent antimonials in conjunction with other antileihmanial compounds. Our previous study found that TiO2@Ag nanoparticles (TiAgNps) demonstrated significant antileishmanial effects. However, a lethal dose of TiAgNps on L...
January 19, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28105608/ag-nanoparticles-located-on-three-dimensional-pine-tree-like-hierarchical-tio2-nanotube-array-films-as-high-efficiency-plasmonic-photocatalysts
#12
Jinxia Xu, Zhenhuan Wang, Wenqing Li, Xingang Zhang, Dong He, Xiangheng Xiao
High specific surface area three-dimensional pine tree-like hierarchical TiO2 nanotube array films loaded with Ag nanoparticles were successfully prepared by one-step hydrothermal reaction combining with simple and feasible magnetron sputtering. The composite Ag/TiO2-branched nanotube arrays show outstanding photocatalytic property, which is attributed to the boost of plasmonic enhancement carrier generation and separation, higher specific surface area, higher organic pollutant absorption, faster charge transport, and superior light-harvesting efficiency for efficient charge collection...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28105488/effects-of-ceo2-nanoparticles-on-terrestrial-isopod-porcellio-scaber-comparison-of-ceo2-biological-potential-with-other-nanoparticles
#13
Olga Malev, Polonca Trebše, Małgorzata Piecha, Sara Novak, Bojan Budič, Miroslav D Dramićanin, Damjana Drobne
Nano-sized cerium dioxide (CeO2) particles are emerging as an environmental issue due to their extensive use in automobile industries as fuel additives. Limited information is available on the potential toxicity of CeO2 nanoparticles (NPs) on terrestrial invertebrates through dietary exposure. In the present study, the toxic effects of CeO2 NPs on the model soil organism Porcellio scaber were evaluated. Nanotoxicity was assessed by monitoring the lipid peroxidation (LP) level and feeding rate after 14-days exposure to food amended with nano CeO2...
February 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28067653/photocatalytic-degradation-of-methyl-orange-methylene-blue-and-rhodamine-b-with-agcl-nanocatalyst-synthesised-from-its-bulk-material-in-the-ionic-liquid-p6-6-6-14-cl
#14
Borja Rodríguez-Cabo, Iago Rodríguez-Palmeiro, Raquel Corchero, Rosario Rodil, Eva Rodil, Alberto Arce, Ana Soto
The photocatalytic degradation of wastewater containing three industrial dyes belonging to different families, methyl orange (MO), methylene blue (MB) and Rhodamine B (RhB), was studied under UV-Vis irradiation using synthesised silver chloride nanoparticles. The nanocatalyst was prepared by a dissolution/reprecipitation method starting from the bulk powder and the ionic liquid trihexyl(tetradecyl)phosphonium chloride, [P6 6 6 14]Cl, without addition of other solvents. The obtained catalyst was characterised by UV-Vis absorbance, X-ray powder diffraction, transmission electron microscopy and scanning electron microscopy...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28067394/ultrafast-carrier-dynamics-in-bimetallic-nanostructure-enhanced-methylammonium-lead-bromide-perovskites
#15
Holly F Zarick, Abdelaziz Boulesbaa, Alexander A Puretzky, Eric M Talbert, Zachary R DeBra, Naiya Soetan, David B Geohegan, Rizia Bardhan
In this work, we examine the impact of hybrid bimetallic Au/Ag core/shell nanostructures on the carrier dynamics of methylammonium lead tribromide (MAPbBr3) mesoporous perovskite solar cells (PSCs). Plasmon-enhanced PSCs incorporated with Au/Ag nanostructures demonstrated improved light harvesting and increased power conversion efficiency by 26% relative to reference devices. Two complementary spectral techniques, transient absorption spectroscopy (TAS) and time-resolved photoluminescence (trPL), were employed to gain a mechanistic understanding of plasmonic enhancement processes...
January 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/28055265/nanomaterial-induced-cell-death-in-pulmonary-and-hepatic-cells-following-exposure-to-three-different-metallic-materials-the-role-of-autophagy-and-apoptosis
#16
Ali Kermanizadeh, Kim Jantzen, Michael B Ward, Jon Ambæk Durhuus, Lene Juel Rasmussen, Steffen Loft, Peter Møller
Autophagy is the catabolic process involving the sequestration of the cytoplasm within double-membrane vesicles, which fuse with lysosomes to form autolysosomes in which autophagic targets are degraded. Since most endocytic routes of nanomaterial uptake converge upon the lysosome and the possibility that autophagy induction by NMs may be an attempt by the cell to self-preserve following the external challenge, this study investigated the role of autophagy following exposure to a panel of widely used metal-based NMs with high toxicity (Ag and ZnO) or low toxicity (TiO2) in a pulmonary (A549) and hepatic (HepG2) cell line...
January 5, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28044458/application-of-bayesian-networks-for-hazard-ranking-of-nanomaterials-to-support-human-health-risk-assessment
#17
Hans J P Marvin, Yamine Bouzembrak, Esmée M Janssen, Meike van der Zande, Finbarr Murphy, Barry Sheehan, Martin Mullins, Hans Bouwmeester
In this study a Bayesian Network (BN) was developed for the prediction of the hazard potential and biological effects with the focus on metal- and metal-oxide nanomaterials to support human health risk assessment. The developed BN captures the (inter) relationships between the exposure route, the nanomaterials physicochemical properties, and the ultimate biological effects in a holistic manner and was based on international expert consultation and the scientific literature (e.g. in vitro/in vivo data). The BN was validated with independent data extracted from published studies and the accuracy of the prediction of the nanomaterials hazard potential was 72% and for the biological effect 71%, respectively...
January 3, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28024545/biodegradation-of-cotton-and-cotton-polyester-fabrics-impregnated-with-ag-tio2-nanoparticles-in-soil
#18
Milica Milošević, Ana Krkobabić, Marija Radoičić, Zoran Šaponjić, Tamara Radetić, Maja Radetić
This study discusses the biodegradation behavior of cotton and cotton/PET fabrics impregnated with Ag/TiO2 nanoparticles in soil. Biodegradation behavior was evaluated by standard test method ASTM 5988-03 based on determination of percentage conversions of carbon content to CO2 as well as by soil burial test and enzymatic hydrolysis with cellulase where the extent of biodegradation was estimated by the calculation of fabric weight loss. The morphological and chemical changes of fibers during biodegradation process were analyzed by SEM and FTIR spectroscopy, respectively...
February 20, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28017784/ecophysiological-perspectives-on-engineered-nanomaterial-toxicity-in-fish-and-crustaceans
#19
Neal Ingraham Callaghan, Tyson James MacCormack
Engineered nanomaterials (ENMs) are incorporated into numerous industrial, clinical, food, and consumer products and a significant body of evidence is now available on their toxicity to aquatic organisms. Environmental ENM concentrations are difficult to quantify, but production and release estimates suggest wastewater treatment plant effluent levels ranging from 10(-4) to >10(1)μgL(-1) for the most common formulations by production volume. Bioavailability and ENM toxicity are heavily influenced by water quality parameters and the physicochemical properties and resulting colloidal behaviour of the particular ENM formulation...
December 23, 2016: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28011354/ozone-regeneration-of-granular-activated-carbon-for-trihalomethane-control
#20
Xuexiang He, Mark Elkouz, Mandu Inyang, Eric Dickenson, Eric C Wert
Spatial and temporal variations of trihalomethanes (THMs) in distribution systems have challenged water treatment facilities to comply with disinfection byproduct rules. In this study, granular activated carbon (GAC) and modified GAC (i.e., Ag-GAC and TiO2-GAC) were used to treat chlorinated tap water containing CHCl3 (15-21μg/L), CHBrCl2 (13-16μg/L), CHBr2Cl (13-14μg/L), and CHBr3 (3μg/L). Following breakthrough of dissolved organic carbon (DOC), GAC were regenerated using conventional and novel methods...
December 9, 2016: Journal of Hazardous Materials
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