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Ag TiO2

Zhen Yu, Rui Hao, Liang Zhang, Yi Zhu
Nanoparticles (NPs) are inevitably released into the aquatic environment for being widely used and may affect the toxicity of other contaminants already present in the environment, such as trace metals. However, the effects of NPs on the ecotoxicity of cadmium (Cd), a common environmental trace metal pollutant, are not well explored. In this study, effects of four widely used NPs TiO2 (n-TiO2 ), SiO2 (n-SiO2 ), Ag (n-Ag) and CdTe/CdS core/shell quantum dots (QD) on the toxicity of Cd to the freshwater algae Chlamydomonas reinhardtii were assessed respectively...
March 13, 2018: Ecotoxicology and Environmental Safety
Haiyan Wang, Huanshun Yin, Hua Huang, Kelin Li, Yunlei Zhou, Geoffrey I N Waterhouse, Hai Lin, Shiyun Ai
Herein, a novel dual-signal amplified photoelectrochemical (PEC) biosensor was successfully developed for the highly selective detection of N6 -methyladenosine (m6 A) methylated RNA. The PEC biosensor comprised BiVO4 -110-TiO2 heterojunction and gold nanoparticle decorated MoS2 (MoS2 -AuNPs) as the photoactive materials, horseradish peroxidase conjugated biotin (HRP-Biotin) as the enzymatic unit, Ag+ -mediated cytosine pairs (C-Ag+ -C) as the signal amplification unit, and the anti-m6 A antibody as the m6 A methylated RNA recognition unit...
February 27, 2018: Biosensors & Bioelectronics
Benjamin P Espinasse, Nicholas K Geitner, Ariette Schierz, Mathieu Therezien, Curtis John Richardson, Gregory V Lowry, P Lee Ferguson, Mark R Wiesner
During nanoparticle environmental exposure, presence in the water column is expected to dominate long distance transport as well as initial aquatic organism exposure. Much work has been done to understand potential ecological and toxicological effects of these particles. However, little has been done to date to understand the comparative persistence of engineered particles in realistic environmental systems. Presented here is a study of the water column lifetimes of 3 different classes of nanoparticles prepared with a combination of surface chemistries in wetland mesocosms...
March 5, 2018: Environmental Science & Technology
S Krawczyk, A Nawrocka, A Zdyb
The electronic structure of excited photosensitizer adsorbed at the surface of a solid is the key factor in the electron transfer processes that underlie the efficiency of dye-sensitized solar cells and photocatalysts. In this work, Stark effect (electroabsorption) spectroscopy has been used to measure the polarizability and dipole moment changes in electronic transitions of pyrene-1-carboxylic (PCA), -acetic (PAA) and -butyric (PBA) acids in ethanol, both free and adsorbed on colloidal TiO2 , in glassy ethanol at low temperature...
February 24, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Julie J Murcia Mesa, Lizeth G Arias Bolivar, Hugo Alfonso Rojas Sarmiento, Elsa Giovanna Ávila Martínez, César Jaramillo Páez, Mayra Anabel Lara, José Antonio Navío Santos, María Del Carmen Hidalgo López
In this study, the treatment of wastewater coming from a river highly polluted with domestic and industrial effluents was evaluated. For this purpose, series of photocatalysts obtained by ZnO and TiO2 modification were evaluated. The effect of metal addition and Ti precursor (in the case of the titania series) over the physicochemical and photocatalytic properties of the materials obtained was also analyzed. The evaluation of the photocatalytic activity showed that semiconductor modification and precursor used in the materials synthesis are important factors influencing the physicochemical and therefore the photocatalytic properties of the materials obtained...
March 2, 2018: Environmental Science and Pollution Research International
Woo Jin Chung, Dinh Duc Nguyen, Xuan Thanh Bui, Sang Woo An, J Rajesh Banu, Sang Moon Lee, Sung Su Kim, Dea Hyun Moon, Byong Hun Jeon, Soon Woong Chang
In this study, a magnetically separable, highly active, and recyclable photocatalyst was synthesized by physico-chemical incorporation of Ag, TiO2 , and Fe3 O4 into one structure. The physical and chemical properties of the catalysts were evaluated by X-ray diffraction, X-ray fluorescence spectrometry, scanning electron microscopy, field emission transmission electron microscopy, energy dispersive X-ray spectroscopy, and diffuse reflectance spectroscopy. The Ag-supported magnetic TiO2 composite demonstrated desirable properties and features such as a narrow band gap of 1...
February 22, 2018: Journal of Environmental Management
Saman Kohnehpoushi, Pariya Nazari, Bahram Abdollahi Nejand, Mehdi Eskandari
Here, the MoS2 thin film was studied as a potential 2D hole transporting materials for fabrication of low-cost, durable, and efficient perovskite solar cells. Regarding the 2D character of MoS2, its thickness was studied as a potential factor in reaching high power conversion efficiency of the perovskite solar cells. Besides, the perovskite layer thickness and the different metal back contacts showed distinct photovoltaic properties of the designed perovskite solar cells. The results presented that a single sheet of MoS2 could considerably improve the device PCE from 10...
February 23, 2018: Nanotechnology
Zhi-Jun Zhao, Minpyo Lee, Hyeokjung Kang, SoonHyoung Hwang, Sohee Jeon, Namkyoo Park, Sanghu Park, Jun-Ho Jeong
In this study, 8 inch-wafer scale flexible polarization-dependent color filters with Ag-TiO2 composite nanowires have been fabricated using nanoimprint and E-beam evaporation. The filters change their color via a simple rotation of the polarizer. In addition, the color of the filter can be controlled by altering the thickness of the Ag and TiO2 nanowires deposited on the polymer patterns. Polarization-dependent color filters were realized by selective inhibition of the transmission spectra using plasmonic resonance at the insulator/metal/insulator nanostructure interface, which occurs at particular wavelengths for the transverse magnetic polarizations...
February 20, 2018: ACS Applied Materials & Interfaces
S Ramakrishnan, E J Jelmy, R Senthilkumar, Murali Rangarajan, Nikhil K Kothurkar
Bilayer and few layer-graphene (Gr) with noble metal (Ag and Au) and TiO2 nanoparticles were synthesized using atmospheric pressure radio frequency chemical vapor deposition (APRF-CVD). The precursors for the formation of the respective nanoparticles were dissolved in ethanol and injected into the APRF-CVD containing a Cu foil catalyst at 1000 °C. The graphene obtained had a blistered morphology similar to bubble-wrap. The bubble-like protrusions on the graphene sheet were caused by large nanoparticle clusters (~220 nm) formed below the graphene sheets...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Vaithiyanathan Ramamoorthy, Kathiravan Kannan, Sivakumar Thiripuranthagan
Photocatalytic degradation of commercial textile azo dyes such as Reactive Red 120 (RR 120), Acid Orange 20 (AO 20), Reactive Orange 16 (RO 16) and Congo Red (CR) was studied under UV light and visible light irradiations of wave length 365 nm and 420 nm respectively over bare and modified titania catalysts such as TiO2, 1% Ag/TiO2, 30% TiO2/SiO2 and 1% Ag/30% TiO2/SiO2. On comparison of the catalytic activity of all the synthesized catalysts under UV and Visible irradiations, it was found that the composite catalysts showed higher photocatalytic activity than bare TiO2...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Jinzhao Huang, Nannan Yao, Xiaolong Deng, Ke Fu, Siyuan Chen
In this paper, graphene modified by Ag nanoparticles was successfully applied into dye sensitized solar cells. The morphologies and compositions of graphene and graphene-Ag nanoparticles were characterized by scanning electron microscope and energy dispersive X-ray spectroscopy. The optical and electrical properties were evaluated by UV-vis-NIR absorption spectroscopy, electrochemical impedance spectroscopy and current-voltage curve. The results indicated that the incorporation of graphene or graphene-Ag nanoparticles can improve the light absorption and decrease the charge recombination...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Roland Masa, Ágota Deák, Gábor Braunitzer, Zsolt Tóth, Judit Kopniczky, István Pelsőczi-Kovács, Krisztina Ungvári, Imre Dékány, Kinga Turzó
Failure of dental implants is caused mainly by peri-implant infections resulting in loss of supporting bone. Since there is no ideal therapy of peri-implantitis, the focus of research has been shifted toward better prevention and the development of antibacterial surfaces. In our study we examined the attachment and proliferation of primary epithelial and MG-63 osteosarcoma cells on Ti dental implants coated with photocatalytic nanohybrid films. Two polyacrylate resin based layers were investigated on commercially pure (CP4) Ti discs: 60 wt% TiO2/40 wt% copolymer and 60 wt% Ag-TiO2/40 wt% copolymer ([Ag] = 0,001 wt%)...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Chitralekha Ngangbam, Naorem Khelchand Singh, Aniruddha Mondal
Glancing Angle Deposition (GLAD) technique was employed to synthesize Ag doped TiO2 nanowire on n-type Si-substrate. FEG-SEM confirms the perpendicular growth of Ag doped TiO2 nanowire with an average height and diameter of ~554 nm and ~40 nm respectively. The composition analysis by EDAX indicates the presence of Ti, O, Si and Ag elements. The increase in PL intensity has been observed with the increase in temperature. Following the growth of Ag doped TiO2 nanowire, Au contacts were deposited to form the Ag doped TiO2 NW based Schottky detector...
July 1, 2018: Journal of Nanoscience and Nanotechnology
Wan-Kuen Jo, Hee-Jin Yoo
Herein, nanosheets of g-C3N4 (CN), prepared using a green ultrasonication process under various conditions, were combined with Ag/black TiO2 nanocomposites (AgBT) to create two-dimensional (2D) CN/Ag/black TiO2 tri-composites (CNAgBT). The thickness of the CN sheets varied with the ultrasonication conditions. The CNAgBT sample prepared using ultrasound-treated CN exhibited the highest average photocatalytic efficiencies for the degradation of two model pollutants, followed in decreasing order by AgBT, black TiO2 (BT), sheet CN, bulk CN, and TiO2...
April 2018: Ultrasonics Sonochemistry
Shams Tabrez Khan, Javed Ahmad, Maqusood Ahamed, Alexandre Jousset
Nanoparticles are widely used as antimicrobial compounds. At sub-lethal concentrations, they may also stress microbes, potentially inducing antibiosis. Here we assess whether nanoparticles can serve as an enhancer of antibiosis in beneficial microbes. Several host-associated bacteria can suppress pathogens, providing therefore a first line of defense against diseases. In the present study, we assessed whether nanoparticles stimulate the antifungal activity of Pseudomonas protegens CHA0, a model plant-associated bacterium, against the ascomycete yeast Candida albicans...
January 31, 2018: Science of the Total Environment
Diego E Pissinis, Guillermo A Benítez, Patricia L Schilardi
The use of indwelling devices has emerged as a frequent and often life-saving medical procedure. However, infection in prosthetic surgery is one of the most important and devastating complications. Once the biofilm has been formed, its eradication is extremely difficult, due to an increased resistance to host defense and conventional antimicrobials. Thus, the design of novel strategies for inhibiting the bacterial adhesion on implantable devices is a key point for successful surgical procedures. In this work, the development of a simple two-step protocol to prepare surfaces able to prevent the bacterial growth was successfully achieved...
January 31, 2018: Colloids and Surfaces. B, Biointerfaces
Lidiane Patrícia Gonçalves, Alejandro Miñán, Guillermo Benítez, Mónica Fernández Lorenzo de Mele, María Elena Vela, Patricia L Schilardi, Elias Paiva Ferreira-Neto, Júlia Cristina Noveletto, Wagner Rafael Correr, Ubirajara Pereira Rodrigues-Filho
Medical device-related infections represent a major healthcare complication, resulting in potential risks for the patient. Antimicrobial materials comprise an attractive strategy against bacterial colonization and biofilm proliferation. However, in most cases these materials are only bacteriostatic or bactericidal, and consequently they must be used in combination with other antimicrobials in order to reach the eradication condition (no viable microorganisms). In this study, a straightforward and robust antibacterial coating based on Phosphotungstate Ormosil doped with core-shell (SiO2@TiO2) was developed using sol-gel process, chemical tempering, and Ag nanoparticle photoassisted synthesis (POrs-CS-Ag)...
December 26, 2017: Colloids and Surfaces. B, Biointerfaces
Carolyn M Wilke, Bettina Wunderlich, Jean-François Gaillard, Kimberly A Gray
Due to their widespread use and subsequent release, engineered nanomaterials (ENMs) will create complex mixtures and emergent systems in the natural environment where their chemical interactions may cause toxic stress to microorganisms. We previously showed that under dark conditions n-TiO2 attenuated bacterial stress caused by low concentrations of n-Ag (<20 μg L-1) due to Ag+ adsorption. Yet, since both n-Ag and n-TiO2 are photoactive, their photochemistries may play a key role in their interactions. In this work, we study the chemical interactions of n-Ag and n-TiO2 mixtures in a natural aqueous medium under simulated solar irradiation to investigate the effects of photoinduced stress...
February 2, 2018: Environmental Science & Technology
Gang Xiao, Yilin Zhao, Linghui Li, Jonathan Pratt, Haijia Su, Tianwei Tan
This paper presents a facile, rapid, and controllable procedure for the recovery of trace Ag+ ions and in situ assembly of well dispersed Ag nanoparticles on chitosan-TiO2 composites through bioaffinity adsorption followed by photocatalytic reduction. The prepared Ag nanoparticles are proven to be efficient and recyclable nanocatalysts for the reduction of 4-nitrophenol to 4-aminophenol in the presence of NaBH4. Well dispersed quasi-spherical Ag NPs are synthesized in 20 min in the designed inner-irradiated photocatalytic system under a wide range of Ag+ concentrations (50-200 mg‧L-1), temperatures (10-25 °C) conditions, and UV or visible light irradiation...
February 1, 2018: Nanotechnology
Chen Liu, Lei Geng, YiFan Yu, Yutong Zhang, Buyun Zhao, Qi Zhao
It has been demonstrated that Ag-TiO2 nanocomposite coatings with excellent antimicrobial activity and biocompatibility have the potential to reduce infection problems. However, the mechanism of the synergistic effect of Ag-TiO2 coatings on antibacterial efficiency is still not well understood. In this study, five types of Ag-TiO2 nanocomposited coatings with different TiO2 contents were prepared on a titanium substratum. Leaching tests indicated that the incorporation of TiO2 nanoparticles into an Ag matrix significantly promoted Ag ion release...
January 29, 2018: Biofouling
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