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Ag TiO2

Martha L López-Moreno, Yarilyn Cedeño-Mattei, Sonia Janet Bailón-Ruiz, Edgar Vazquez-Nuñez, José A Hernandez-Viezcas, Oscar Juan Perales-Pérez, Guadalupe De la Rosa, José R Peralta-Videa, Jorge L Gardea-Torresdey
The application of nanomaterials (NMs) depends on several characteristics, including polydispersity, shape, surface charge, and composition, among others. However, the specific surface properties of bare NMs induce aggregation, reducing their utilization. Thus, different surface coverages have been developed to avoid or minimize NMs aggregation, making them more stable for the envisioned applications. Carbon-based NMs are usually coated with metals, while metal-based NMs are coated with natural organic compounds including chitosan, dextran, alginate, or citric acid...
December 25, 2017: Journal of Hazardous Materials
Peri Korshed, Lin Li, Zhu Liu, Aleksandr Mironov, Tao Wang
In this study, we explored the antibacterial mechanisms for a novel type of Ag-TiO2 compound nanoparticles (NPs) produced from an Ag-TiO2 alloy using a picosecond laser and evaluated the toxicity of the Ag-TiO2 NPs to a range of human cell types. Transmission electron microscopy was used to determine the morphology, shapes, and size distribution of the laser-generated Ag-TiO2 NPs. UV-visible spectrometer was used to confirm the shift of light absorbance of the NPs toward visible light wavelength. Results showed that the laser-generated Ag-TiO2 NPs had significant antibacterial activities against both Gram-negative and Gram-positive bacterial strains, including Escherichia coli, Pseudomonas aeruginosa, and the methicillin-resistant Staphylococcus aureus...
2018: International Journal of Nanomedicine
Yi Zeng, Xin Du, Bingbing Gao, Bing Liu, Zhuoying Xie, Zhongze Gu
The combination of surface-enhanced Raman scattering (SERS) with high-throughput screening (HTS) has significant importance for highly sensitive and massive workload assays. Although fabrication of HTS-SERS substrates can be achieved by several methods, the high cost as well as large-equipment-dependence limit their applications. Here we report a simple method to fabricate HTS-SERS substrates within one-step process. The HTS-SERS substrate is fabricated by simply UV irradiating a fluoroalkylsilane-modified liquid-repellent TiO2 surface in AgNO3 solution through a photomask...
January 3, 2018: ACS Applied Materials & Interfaces
Yu Jiang, Ying Wu, Yuexi Chen, Zhenyu Qi, Jinan Shi, Lin Gu, Yan Yu
To develop high-performance sodium-ion batteries (NIBs), electrodes should possess well-defined pathways for efficient electronic/ionic transport. In this work, high-performance NIBs are demonstrated by designing a 3D interconnected porous structure that consists of N, S co-doped 3D porous graphene frameworks (3DPGFs-NS). The most typical electrode materials (i.e., Na3 V2 (PO4 )3 (NVP), MoS2 , and TiO2 ) are anchored onto the 3DPGFs-NS matrix (denoted as NVP@C@3DPGFs-NS; MoS2 @C@3DPGFs-NS and TiO2 @C@3DPGFs-NS) to demonstrate its general process to boost the energy density of NIBs...
December 29, 2017: Small
Na Li, Lijia Wang, Huicong Yan, Meizhen Wang, Dongsheng Shen, Jun Yin, Jiali Shentu
The toxicity of engineered nanoparticles (ENPs) on bacteria has aroused much interest. However, few studies have focused on the effects of low-level ENPs on bacterial group behaviors that are regulated by quorum sensing (QS). Herein, we investigated the effects of nine ENPs (Ag, Fe, ZnO, TiO2, SiO2, Fe2O3, single-wall carbon nanotubes (SWCNTs), graphene oxide (GO), and C60) on QS in Pseudomonas aeruginosa PAOl. An ENP concentration of 100 μg L-1 did not impair bacterial growth. However, concentrations of 100 μg L-1 of Ag and GO ENPs induced significant increases in 3OC12-HSL in the culture and significantly promoted protease production and biofilm formation of PAO1...
December 23, 2017: Environmental Science and Pollution Research International
Maqusood Ahamed, M A Majeed Khan, Mohd Javed Akhtar, Hisham A Alhadlaq, Aws Alshamsan
We investigated the anticancer potential of Ag-doped (0.5-5%) anatase TiO2 NPs. Characterization study showed that dopant Ag was well-distributed on the surface of host TiO2 NPs. Size (15 nm to 9 nm) and band gap energy (3.32 eV to 3.15 eV) of TiO2 NPs were decreases with increasing the concentration of Ag dopant. Biological studies demonstrated that Ag-doped TiO2 NP-induced cytotoxicity and apoptosis in human liver cancer (HepG2) cells. The toxic intensity of TiO2 NPs was increases with increasing the amount of Ag-doping...
December 15, 2017: Scientific Reports
Xinnong Wang, Shencheng Fu, Xintong Zhang, Xiuxiu Han, Shuangyan Liu, Lihong Kang, Yang Zhang, Yichun Liu
Noble metal plasmonic resonance has been utilized in optical data storage widely for its excellent photo-transformation efficiency. TiO2 nanoporous films deposited with Ag nanoparticles present outstanding polarization-response and color-modulation ability. However, the low exposure-sensitivity at single wavelength inhibits their application in optical information processing, which is urgent to be improved by innovative methods. Here, we report that Ag nanoparticles were deposited efficiently via continuous laser irradiation in the TiO2 nanoporous film treated by tannic acid, presenting high-efficient monochromic absorption property...
December 11, 2017: Optics Express
Mehran Alavi, Naser Karimi
Recently, major problem related to pathogenic bacteria is augmentation of antibiotic resistance which has been changed treatment and recovery of millions of infectious patients. The present study reports an eco-friendly, rapid and easy method for synthesis of silver (Ag), copper (Cu) and titanium dioxide (TiO2) nanoparticles (NPs) using Artemisia haussknechtii leaf aqueous extract with antibacterial activities against multi-drug resistance (MDR) bacteria species. Three different concentrations (0.001, 0.01 and 0...
December 12, 2017: Artificial Cells, Nanomedicine, and Biotechnology
Nan Lu, Yaqi Wang, Shiqi Ning, Wenjing Zhao, Min Qian, Ying Ma, Jia Wang, Lingyun Fan, Jiunian Guan, Xing Yuan
A series of plasmonic Ag-TiO2/H3PW12O40 composite films were fabricated and immobilized by validated preparation technique. The chemical composition and phase, optical, SPR effect and pore-structure properties together with the morphology of as-prepared composite film are well-characterized. The multi-synergies of as-prepared composite films were gained by combined action of electron-capture action via H3PW12O40, visible-response induced by Ag, and Schottky-junction formed between TiO2-Ag. Under simulated sunlight, the maximal K app of o-chlorophenol (o-CP) reached 0...
December 11, 2017: Scientific Reports
Yen-Chi Chen, Kuo-Pin Yu, Wen-Cheng Shao, Chao-Heng Tseng, Wen-Chi Pan
In this study, we evaluated the long-term antifungal effectiveness of 3 types of interior building materials (gypsum board (GB), cement board (CB) and softwood plywood (S-PW)) impregnated with thermally reduced silver nanoparticles supported by titanium dioxide (AgNPs/TiO2 ) under 95% relative humidity for four weeks. AgNPs/TiO2 was synthesized at two thermal reduction temperatures (TRTs, 120 and 200°C) with two different AgNP weight percentages (2 and 5 wt%). Four different silver loading levels (SLLs, 0...
December 11, 2017: Indoor Air
Imran Zada, Wang Zhang, Wangshu Zheng, Yuying Zhu, Zhijian Zhang, Jianzhong Zhang, Muhammad Imtiaz, Waseem Abbas, Di Zhang
The negative replica of biomorphic TiO2 with nano-holes structure has been effectively fabricated directly from nano-nipple arrays structure of cicada wings by using a simple, low-cost and highly effective sol-gel ultrasonic method. The nano-holes array structure was well maintained after calcination in air at 500 °C. The Ag nanoparticles (10 nm-25 nm) were homogeneously decorated on the surface and to the side wall of nano-holes structure. It was observed that the biomorphic Ag-TiO2 showed remarkable photocatalytic activity by degradation of methyl blue (MB) under UV-vis light irradiation...
December 8, 2017: Scientific Reports
Dwipak Prasad Sahu, S Narayana Jammalamadaka
We report on the magnetic field control of a bipolar resistive switching in Ag/TiO2/FTO based resistive random access memory device through I-V characteristics. Essentially, in the presence of magnetic field and in the low resistance state, an abrupt change in the resistance of the device demands higher voltage, hinting that residual Lorentz force plays a significant role in controlling the resistance state. Endurance characteristics of the device infer that there is no degradation of the device even after repeated cycling, which ensures that the switching of resistance between 'off' and 'on' states is reproducible, reversible and controllable...
December 8, 2017: Scientific Reports
Marc Riedel, Fred Lisdat
Inspired by natural photosynthesis, coupling of artificial light-sensitive entities with biocatalysts in a biohybrid format can result in advanced photobioelectronic systems. Herein, we report on the integration of sulfonated polyanilines (PMSA1) and PQQ glucose dehydrogenase (PQQ-GDH) into inverse opal TiO2 (IO-TiO2) electrodes. While PMSA1 introduces sensitivity for visible light into the biohybrid architecture and ensures the efficient wiring between the IO-TiO2 electrode and the biocatalytic entity, PQQ-GDH provides the catalytic activity for the glucose oxidation and therefore feeds the light-driven reaction with electrons for an enhanced light-to-current conversion...
December 8, 2017: ACS Applied Materials & Interfaces
Hiesang Sohn, Se Yun Kim, Weon Ho Shin, Jong Min Lee, Hyangsook Lee, Dong-Jin Yun, Kyoung-Seok Moon, Intaek Han, Chan Kwak, Seong-Ju Hwang
Flexible transparent conductive films (TCFs) of TiO2 nanosheet (TiO2 NS) and silver nanowire (Ag NW) network hybrid were prepared through a simple and scalable solution-based process. As-formed TiO2 NS-Ag NW hybrid TCF shows a high optical transmittance (TT: 97% (90.2% including plastic substrate)) and low sheet resistance (Rs: 40 ohm/sq.). In addition, TiO2 NS-Ag NW hybrid TCF exhibits a long-time chemical/ageing and electro-mechanical stability. As for the chemical/ageing stability, the hybrid TCF of Ag NW and TiO2 NS reveals a retained initial conductivity (ΔRs/Rs <1%) under ambient oxidant gas over a month, superior to that of bare Ag NW (ΔRs/Rs >4000%) or RuO2 NS-Ag NW hybrid (ΔRs/Rs >200%)...
December 7, 2017: ACS Applied Materials & Interfaces
Tianshu Wu, Meng Tang
Despite the increasing number of neurotoxicological studies on metal-containing nanoparticles (NPs), the NP-induced neuroinflammation has not yet been well understood. This review provides a comprehensive understanding of inflammatory responses to two typical metal-containing NPs, namely silver NPs (Ag-NPs) and titanium dioxide NPs (TiO2-NPs). Ag-NPs and TiO2-NPs could translocate into the CNS through damaged blood-brain barrier, nerve afferent signaling and eye-to-brain ways, and even cell uptake. NPs could stimulate the activation of glial cells to release proinflammatory cytokines and generate reactive oxygen species and nitric oxide production, resulting in the neuroinflammation...
December 4, 2017: Nanomedicine
Ruud J B Peters, Greet van Bemmel, Nino B L Milani, Gerco C T den Hertog, Anna K Undas, Martijn van der Lee, Hans Bouwmeester
Nano-enabled consumer products are a likely source of nanoparticles in the environment and a number of studies have shown the release of nanoparticles from commercial products. Predicted environmental concentrations have been calculated but there is a need for real measurement data to validate these calculations. However, the detection of engineered nanoparticles in environmental matrices is challenging because of the low predicted environmental concentrations which may be in the ng/L range. In this study nanosized Ag, CeO2 and TiO2 have been measured in multiple surface water samples collected along the rivers Meuse and IJssel in the Netherlands using single-particle ICP-MS as measurement technique...
November 24, 2017: Science of the Total Environment
Fatemeh Lavaee, Kiana Faez, Kioumars Faez, Nahal Hadi, Farzan Modaresi
PURPOSE: To compare the antimicrobial effects of chlorhexidine, penicillin, erythromycin, clindamycin, tetracycline and vancomycin with silver, titanium dioxide and iron nanoparticles and also to consider the synergistic antibacterial and antibiofilm effects of nanoparticles in clinical and standard strains of Streptococcus mutans and Streptococcus sanguinis. METHODS: The specimens collected from 66 3-5 year-old children with detected S. mutans and S. sanguinis by PCR were then exposed to the antimicrobial activity of chlorhexidine, penicillin, erythromycin, clindamycin, tetracycline and vancomycin with silver, titanium dioxide and iron nanoparticles measured by microdilution and disc diffusion tests and the colony counted after 1 to 5 minutes...
December 2016: American Journal of Dentistry
Zainab Khan, Nicholas F Dummer, Jennifer K Edwards
A series of bimetallic silver-palladium catalysts supported on titania were prepared by wet impregnation and assessed for the direct synthesis of hydrogen peroxide, and its subsequent side reactions. The addition of silver to a palladium catalyst was found to significantly decrease hydrogen peroxide productivity and hydrogenation, but crucially increase the rate of decomposition. The decomposition product, which is predominantly hydroxyl radicals, can be used to decrease bacterial colonies. The interaction between silver and palladium was characterized using scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and temperature programmed reduction (TPR)...
January 13, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Pascal Nbelayim, Go Kawamura, Wai Kian Tan, Hiroyuki Muto, Atsunori Matsuda
The use of plasmonic nanoparticles (NPs) in dye-sensitized solar cells (DSSCs) in an effort to enhance their power conversion efficiencies (PCEs) increases light absorbance of the cells but also affect their electron dynamics. This has contributed to the failure of plasmonic NPs to make the expected high impact of PCE enhancement. Herein, we investigated the wide range effects of plasmonic NPs on the performance of DSSCs, using extended characterization and a systematic approach. We prepared DSSCs using Ag@TiO2 NPs-doped TiO2 photoanodes...
November 16, 2017: Scientific Reports
Rebecca A Scheidt, Gergely F Samu, Csaba Janáky, Prashant V Kamat
The charging of a mesoscopic TiO2 layer in a metal halide perovskite solar cell can influence the overall power conversion efficiency. By employing CsPbBr3 films deposited on a mesoscopic TiO2 film, we have succeeded in probing the influence of electrochemical bias on the charge carrier recombination process. The transient absorption spectroscopy experiments conducted at different applied potentials indicate a decrease in the charge carrier lifetimes of CsPbBr3 as we increase the potential from -0.6 to +0.6 V vs Ag/AgCl...
November 21, 2017: Journal of the American Chemical Society
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