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Ag TiO2

Jang Ho Joo, Byung-Ho Kim, Jae-Seung Lee
A novel room-temperature aqueous synthesis for gold nanoparticle-embedded silver cubic mesh nanostructures using AgCl templates via a template-assisted coreduction method is developed. The cubic AgCl templates are coreduced in the presence of AuCl4(-) and Ag(+) , resulting in the reduction of AuCl4(-) into gold nanoparticles on the outer region of AgCl templates, followed by the reduction of AgCl and Ag(+) into silver cubic mesh nanostructures. Removal of the template clearly demonstrates the delicately designed silver mesh nanostructures embedded with gold nanoparticles...
September 13, 2017: Small
Hima Bindu Mantravadi
INTRODUCTION: Nanoparticles composed of Titanium Oxide (TiO2) are non toxic, durable, stable and have a high refractive index with a lot of scope in biomedical applications. Due to their antibacterial effects, they can be applied to inanimate objects like glass, metal and even biomedical implants. AIM: This study was conducted to assess the antibacterial effect of Titanium Oxide (TiO2) alone or with Silver (Ag) as an additive on Escherichia coli. MATERIALS AND METHODS: Escherichia coli isolates (n=25) sensitive to most of the drugs including first generation cephalosporins, ampicillin and amoxycillin from various samples like pus, urine, sputum and blood were placed onto the glass slides containing TiO2 annealed at 200°C, 400°C, TiO2 with 0...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
Fan Wang, Qiuhui Hu, Alfred Mugambi Mariga, Chongjiang Cao, Wenjian Yang
A nano packaging material containing nano Ag, nano TiO2, nano attapulgite and SiO2 was prepared, and its impact on quality of Nanjing 9108 rice at 37°C and 85% relative humidity was studied. Effects of the packaging on ambient gases and chromatic aberration of rice were determined. Moreover, oxidation level, molds growth and flavor of rice were also analyzed. Results showed that nano packaging material had antimicrobial effects and maintained low O2 and high CO2 content in the packages. The packages thereby inhibited the growth of molds and the production of fatty acids, restrained the increase of lipase activity, and reduced the oxidation of fats and proteins...
January 15, 2018: Food Chemistry
Xiaojun Wang, Xiaoan Xia, Xiaogang Zhang, Weijia Meng, Chen Yuan, Meiqing Guo
This study was dedicated to develop a nonenzymatic glucose sensor based on Ag&Pt hollow nanoparticles supported on TiO2 nanotubes. The Ag&Pt-TiO2/(500°C) was synthesized by a simple reduction and galvanic replacement method in an aqueous solution. The surface morphology and structure of Ag&Pt-TiO2/(500°C) could be examined by transmission electron microscopy, scanning electron microscopy and energy dispersive spectrometer. The mechanical behavior was measured by nanoindentation test and the hydropathy property was measured by contact angle test...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Saravanakumar Duraisamy, Jieun Song, Sunhye Lee, Namhwi Hur, Woonsup Shin
CO2 and nitrate ions were successfully converted to urea by a TiO2/Nafion® nanocomposite electrode under ambient conditions. The composite electrode was constructed by drop-casting the mixture of P-25 titania and Nafion® solution on an ITO electrode. When the electrode was electrolyzed in CO2-saturated 0.1 M KNO3 (pH 4.5) solution at -0.98 V vs. Ag/AgCl, urea was formed with a Faradaic efficiency of 40%. The other reduced products obtained were ammonia, CO, and H2.
August 23, 2017: ChemSusChem
Zhi-Jun Zhao, Soon Hyoung Hwang, Sohee Jeon, Boyeon Hwang, Joo-Yun Jung, Jihye Lee, Sang-Hu Park, Jun-Ho Jeong
In this study, a periodic three-dimensional (3D) Ag/TiO2 nanocomposite architecture of nanowires was fabricated on a flexible substrate to enhance the plasmonic photocatalytic activity of the composite. Layer-by-layer nanofabrication based on nanoimprint lithography, vertical e-beam evaporation, nanotransfer, and nanowelding was applied in a new method to create different 3D Ag/TiO2 nanocomposite architectures. The fabricated samples were characterized by scanning electron microscopy, transmission electron microscopy, focused ion-beam imaging, X-ray photoelectron spectrometry, and UV-visible spectroscopy...
August 21, 2017: Scientific Reports
Kunal Bhattacharya, Gözde Kiliç, Pedro M Costa, Bengt Fadeel
Engineered nanomaterials (ENMs) are being produced for an increasing number of applications. Therefore, it is important to assess and categorize ENMs on the basis of their hazard potential. The immune system is the foremost defence against foreign bodies. Here we performed cytokine profiling of a panel of nineteen representative ENMs procured from the Joint Research Centre (JRC) and commercial sources. Physicochemical characterization was performed using dynamic light scattering. The ENMs were all shown to be endotoxin content free...
August 17, 2017: Nanotoxicology
Xin Zhao, Weiwei Zhang, Chuchu Peng, Yujie Liang, Wenzhong Wang
In this work, the semiconductor TiO2 nanowires were successfully coupled with plasmonic metal Ag nanoparticles to fabricate hybrid nanostructures with enhanced sensitive Raman substrate. The SERS activities of fabricated hybrid nanostructures were evaluated by detecting the Raman signals of R6G molecules. The fabricated TiO2/Ag nanowire/nanoparticle hybrid nanostructures show sensitive detection ability for R6G molecules. Based on the band structures of Ag nanoparticle, TiO2 nanowire and R6G molecule, the enhanced sensitive SERS activities of hybrid nanostructures is ascribed to an efficient charge transfer process, in which the photogenerated electrons transfer to the conduction band of TiO2 nanowires from metal Ag nanoparticles, and then to LUMO level of R6G molecules, leading to enhanced SERS activities...
August 8, 2017: Journal of Colloid and Interface Science
Xiaolei Wang, Peng Li, Xiao Xia Han, Yasutaka Kitahama, Bing Zhao, Yukihiro Ozaki
A number of recent studies have focused on improving the performance of dye-sensitized solar cells (DSSCs). Cells with a ZnO-TiO2/N3/Ag structure have attracted particular attention because of their excellent power conversion efficiencies. Using a dendritic crystal ZnO-TiO2 composite semiconductor and Ag in conjunction leads to different charge-transfer (CT) processes, and this is the main theoretical basis for the improvement of DSSC performances. Thus, in the present study, TiO2/N3, ZnO/N3, ZnO-TiO2/N3, TiO2/N3/Ag, ZnO/N3/Ag, and ZnO-TiO2/N3/Ag assemblies have been fabricated and their CT processes have been monitored by using surface-enhanced Raman scattering (SERS) spectra, with particular focus on the differences caused by the synergistic effect of the ZnO-TiO2 component...
August 14, 2017: Nanoscale
Ling Wu, Gyu Min Kim, Hiroyasu Nishi, Tetsu Tatsuma
Solid-state photovoltaic cells based on plasmon-induced charge separation (PICS) have attracted growing attention during the past decade. However, the power conversion efficiency (PCE) of the previously reported devices, which are generally loaded with dispersed metal nanoparticles as light absorbers, has not been sufficiently high. Here we report simpler plasmonic photovoltaic cells with interconnected Au, Ag, and Cu half-shell arrays deposited on SiO2@TiO2 colloidal crystals, which serve both as a plasmonic light absorber and as a current collector...
August 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Antti J Koivisto, Alexander C Ø Jensen, Kirsten I Kling, Jens Kling, Hans Christian Budtz, Ismo K Koponen, Ilse Tuinman, Tareq Hussein, Keld A Jensen, Asger Nørgaard, Marcus Levin
Here, we studied the particle release rate during Electrostatic spray deposition of anatase-(TiO2)-based photoactive coating onto tiles and wallpaper using a commercially available electrostatic spray device. Spraying was performed in a 20.3m(3) test chamber while measuring concentrations of 5.6nm to 31μm-size particles and volatile organic compounds (VOC), as well as particle deposition onto room surfaces and on the spray gun user hand. The particle emission and deposition rates were quantified using aerosol mass balance modelling...
July 29, 2017: Journal of Hazardous Materials
Marwa Abid, Soraa Bouattour, Ana M Ferraria, David S Conceição, Ana P Carapeto, Luís F Vieira Ferreira, Ana M Botelho do Rego, Mohamed M Chehimi, Manuel Rei Vilar, Sami Boufi
In the present work, a simple, reliable and cost-effective approach to functionalize cotton fabrics with Ag-TiO2 nanoparticles strongly bound to the fibres and with visible-light-responsive photo-activity is presented. The hybrid cotton-Ag-TiO2 fabrics were characterized by Raman, AFM, FE-SEM, TGA, XPS GSDR, and LIL to confirm the generation of metallic Ag nanoparticles and crystalline TiO2 and investigate how the concentration of Ag and TiO2 precursors affected the morphology and the luminescence properties of the nanostructured layer grafted on the cotton fibres...
July 29, 2017: Journal of Colloid and Interface Science
Faramarz Hossein-Babaei, Mohsen Gharesi, Maryam Moalaghi
Forming reliable ohmic contacts to the functional metal oxide semiconductors has always been problematic in fabricating sensors and actuators. The common practice is to establish wire bonds to the metallic films previously deposited/printed over or under the oxide layer. Here, we describe a method for the diffusion bonding of metallic wire segments directly to the oxide layer surface, and demonstrate the reproducible formation of contacts with reliable mechanical and electrical qualities. Bonding is made at elevated temperatures in the 350-500 °C range under die pressure...
August 16, 2017: ACS Applied Materials & Interfaces
João F Gomes, Inês Leal, Katarzyna Bednarczyk, Marta Gmurek, Marek Stelmachowski, Magdalena Diak, M Emília Quinta-Ferreira, Raquel Costa, Rosa M Quinta-Ferreira, Rui C Martins
Conventional wastewater treatments are inefficient for the removal of parabens. The aim of this study was finding a suitable solution using ozone and UVA irradiation combined with TiO2 catalysts doped with different noble metals (Ag, Pt, Pd, Au). Photocatalytic ozonation required lower amounts of ozone for higher efficiency on the removal of parabens, chemical oxygen demand (COD) and total organic carbon (TOC). The best catalyst for the initial contaminants degradation was 0.5% Ag-TiO2 leading to total parabens removal using 46mgO3/L...
December 31, 2017: Science of the Total Environment
Tianyou Peng, Jingpeng Jin, Jiang Luo, Lin Zan
A new kind of metallic Cu-loaded brookite TiO2 composite, in which Cu nanoclusters with small size of 1-3 nm are decorated on brookite TiO2 quasi nanocubes (BTN) surfaces (hereafter referred as Cu-BTN), is synthesized via a one-pot hydrothermal process, and then used as photocatalyst for CO2 reduction. It was found that the decoration of Cu nanoclusters on BTN surfaces can improve the activity and selectivity of CO2 photoreduction to CH4 production, and 1.5% Cu-BTN gives the maximum overall photocatalytic activity (150...
July 18, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Shih-Yun Chen, Eric Tseng, Yi-Ta Lai, William Lee, Alexandre Gloter
Enhancement of room temperature ferromagnetism (RTFM) has been achieved with core-shell metal-oxide nanoparticles (Ag@CeO2). To enhance the magnetic properties, interfacial charge transfer is achieved via the formation of a core-shell interface. Furthermore, by varying the shell thicknesses, additional control of the RTFM can be obtained. The Ag@CeO2 core-shell nanoparticles are synthesized successfully via a two-step method. Ag nanoparticles (NPs) are first synthesized on a TiO2 substrate by a thermally assisted photoreduction method, and then CeO2 NPs are deposited on the surface of Ag NPs by chemical reduction...
August 3, 2017: Nanoscale
Rongrong Chen, Zhihui Han, Zhuoli Huang, Junu Karki, Chenxin Wang, Bangshang Zhu, Xiuyin Zhang
Silanized aluminum borate whiskers (ABWs) of 4 wt%, silanized zirconium dioxide nanoparticles (nano-ZrO2) of 2 wt% were mixed with polymethyl methacrylate (PMMA) powder to get ZrO2-ABWs/PMMA composites. Titanium dioxide (TiO2), silver-supported titanium dioxide (Ag/TiO2), silver-supported zirconium phosphate (Novaron) and tetrapod-like zinc oxide whiskers (T-ZnOw) antibacterial agents of 3 wt% were mixed with ZrO2-ABWs/PMMA composites respectively to fabricate standard specimens. Plaque biofilms on the specimens surface were investigated for colony-forming units (CFUs)...
July 12, 2017: Dental Materials Journal
Rodolfo Zanella, Edwin Avella, Rosa María Ramírez Zamora, Felipe Castillón Barraza, Juan C Durán-Álvarez
Mono- (Au, Ag and Cu) and bi-metallic (Au-Ag and Au-Cu) nanoparticles were deposited on TiO2 and tested for the photocatalytic degradation of sulfamethoxazole using either UV-C or simulated sunlight. The optimal loading of metallic nanoparticles was determined as 1.5 wt. % for Au and Ag, and 1.0 wt. % for Cu. In the case of bi-metallic nanoparticles only the ratio 1:0.5 wt. % for both Au-Ag and Au-Cu was tested. In experiments using UV-C light, the highest degradation performance was found for Ag/TiO2, while bi-metallic nanoparticles supported on TiO2 also showed increased photocatalytic activity compared with unmodified TiO2...
July 12, 2017: Environmental Technology
Zhensheng Hong, Meiling Kang, Xiaohui Chen, Kaiqiang Zhou, Zhigao Huang, Mingdeng Wei
TiO2 is a most promising anode candidate for rechargeable Na-ion batteries (NIBs) due to its appropriate working voltage, low cost and superior structural stability during chage/discharge process. Nevertheless, it suffers from intrinsically low electrical conductivity. Herein, we report an in-situ synthesis of Co2+ doped TiO2 through the thermal treatment of metal organic frameworks precursors of MIL-125(Ti)-Co as a superior anode material for NIBs. The Co2+ doped TiO2 possesses uniform nanodisk morphology, a large surface area and mesoporous structure with narrow pore distribution...
July 11, 2017: ACS Applied Materials & Interfaces
Fabrizio Sordello, Manuel Ghibaudo, Claudio Minero
We report the electrosynthesis of a water oxidation catalyst based on Ag oxides (AgCat). The deposited AgCat is composed of mixed valence crystalline Ag oxides with the presence of particle aggregates whose size is ∼1 μm. This catalyst, coupled with TiO2 and hematite, and under photoelectrochemical conditions, substantially increases photocurrents in a wide range of applied potentials compared with bare and Co-Pi-modified photocatalysts. AgCat can sustain current densities comparable with other water oxidation catalysts...
July 19, 2017: ACS Applied Materials & Interfaces
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