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[PMID]:29431329
[Au] Autor:Belyaeva NN; Sycheva LP
[Ti] Título:[Morphological comparative assessment of in vivo 2-week oral exposure of silver nanoparticles and silver sulfate on the mice liver].
[So] Source:Gig Sanit;95(9):899-902, 2016.
[Is] ISSN:0016-9900
[Cp] País de publicação:Russia (Federation)
[La] Idioma:rus
[Ab] Resumo:Currently the problem of the impact of nanoparticles and nanomaterials on human health remains to be poorly understood. As in our studies of the impact of silver nanoparticles on rats liver as well in works of other researchers there were investigated morphofunctional indices under peroral exposure. Although all researchers took different sizes, doses and concentrations of silver nanoparticles, various exposure time and different stabilizers, the same effects had been obtained, which, however, were occurred under both different doses and time of exposure. However, it was interesting to compare the impact of silver nanoparticles with reference substance - silver sulfate on the mice liver with the previously evaluated effect produced on the rats ' liver. By ourselves there was executed the morphological comparative evaluation of in vivo oral 2-weeks exposure of 4 concentrations (0.1; 5; 50 and 500 mg/l) of silver nanoparticles with size of 14 nm, stable arabian gum 1:7 by weight, and of 4 similar concentrations of silver sulfate on the liver of male mice СВАхС57В1/6 weighing 25-35g. 2 groups were considered as control: intact mice and mice received gum in water. Results of the exposure were assessed according to 10 morphological and functional indices. The impact of nanosilver was shown to initiate from its concentration of 50 mg/l and to express in the gain of the index of alteration of the cytoplasm of hepatocytes with the increasing in both severity of steatosis and the number of micronecroses, persisting at the same level at concentrations of 500 mg/l and with the elevation of the index of alteration of nuclei of hepatocytes, while the similar effect develops under the influence of silver sulfate at a concentration of 500 mg/l only. The remaining investigated morphofunctional indices did not differ significantly in all groups of mice. Unlike previously executed studies on rats, mice appeared to be sensitive to the effects of nano-silver more than to silver sulfate.
[Mh] Termos MeSH primário: Doença Hepática Induzida por Substâncias e Drogas
Fígado Gorduroso
Fígado
Nanoestruturas
Compostos de Prata
[Mh] Termos MeSH secundário: Administração Oral
Animais
Doença Hepática Induzida por Substâncias e Drogas/diagnóstico
Doença Hepática Induzida por Substâncias e Drogas/etiologia
Modelos Animais de Doenças
Fígado Gorduroso/induzido quimicamente
Fígado Gorduroso/patologia
Células Hep G2
Seres Humanos
Fígado/efeitos dos fármacos
Fígado/patologia
Camundongos
Nanoestruturas/química
Nanoestruturas/toxicidade
Necrose
Compostos de Prata/química
Compostos de Prata/toxicidade
Testes de Toxicidade/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Silver Compounds)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180213
[St] Status:MEDLINE


  2 / 1683 MEDLINE  
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[PMID]:29406118
[Au] Autor:Zhang X; Wang C; Yu C; Teng B; He Y; Zhao L; Fan M
[Ad] Endereço:College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China.
[Ti] Título:Application of Ag/AgBr/GdVO composite photocatalyst in wastewater treatment.
[So] Source:J Environ Sci (China);63:68-75, 2018 Jan.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Ag/AgBr/GdVO composite photocatalysts were designed and synthesized in this paper. The physical and chemical structures, as well as optical properties of the synthesized composite were investigated via XRD, XPS, TEM, and UV-vis. It is found that the composite showed a ternary heterojunction structure of Ag, AgBr and GdVO . Meanwhile, it has a high intensity of light current, indicating its high separation efficiency of electron and hole. Photocatalytic oxidation of rhodamine B (RhB) under visible light irradiation was performed to investigate the activity of the Ag/AgBr/GdVO composite. Result indicates that it shows excellent photocatalytic activity. Under visible light irradiation for 12min, about 80% of RhB (30µmol/L) was degraded. The degradation rate is estimated to be 0.253 min-1, which is three times higher than that of pure AgBr. The high photoactivity can be ascribed to the synergetic effect of AgBr, GdVO , and Ag nanoparticle in separation of electron-hole pairs.
[Mh] Termos MeSH primário: Processos Fotoquímicos
Eliminação de Resíduos Líquidos/métodos
Poluentes Químicos da Água/química
[Mh] Termos MeSH secundário: Brometos/química
Gadolínio/química
Nanopartículas
Oxirredução
Rodaminas/química
Prata/química
Compostos de Prata/química
Vanadatos/química
Águas Residuais/química
Poluentes Químicos da Água/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bromides); 0 (Rhodamines); 0 (Silver Compounds); 0 (Waste Water); 0 (Water Pollutants, Chemical); 3M4G523W1G (Silver); 3WHH0066W5 (Vanadates); AU0V1LM3JT (Gadolinium); K7G5SCF8IL (rhodamine B); NHQ37BJZ2Z (silver bromide)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180216
[Lr] Data última revisão:
180216
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180207
[St] Status:MEDLINE


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[PMID]:29031445
[Au] Autor:Liu S; Zhu D; Zhu J; Yang Q; Wu H
[Ad] Endereço:School of Earth Science and Environmental Engineering, Anhui University of Science and Technology, Huainan 232001, China. Electronic address: shmliu1@163.com.
[Ti] Título:Preparation of Ag@AgCl-doped TiO /sepiolite and its photocatalytic mechanism under visible light.
[So] Source:J Environ Sci (China);60:43-52, 2017 Oct.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:A cube-like Ag@AgCl-doped TiO /sepiolite (denoted Ag@AgCl-TiO /sepiolite) was successfully synthesized via a novel method. X-ray diffraction, scanning electron microscopy, energy dispersion X-ray fluorescence, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and diffuse reflectance ultraviolet-visible spectroscopy were performed to determine the structure and physicochemical properties of Ag@AgCl-TiO /sepiolite. SEM micrographs revealed that Ag@AgCl nanoparticles and TiO film are well deposited on the surface of tube-like sepiolite. As a result, Ag@AgCl-TiO /sepiolite exhibits a red shift relative to TiO /sepiolite. Photocatalytic experiments demonstrated that the dosage of catalysts plays an important role during photocatalysis. The photoelectrochemical activities of Ag@AgCl-TiO /sepiolite and TiO /sepiolite were also investigated. Photocurrent responses confirmed that the ability of Ag@AgCl-TiO /sepiolite to separate photo-generated electron-hole pairs is stronger than that of TiO /sepiolite. Methylene Blue degradation is also improved under alkaline conditions and visible light irradiation because more OH is produced by visible light excitation. This excellent catalytic ability is mainly attributed to the formed Ag nanoparticles and the Schottky barrier at the Ag/TiO interface. Active species analysis indicated that O and h are implicated as active species in photocatalysis. Therefore, catalysts are excited to produce abundant electron-hole pairs after they absorb photons in photocatalysis.
[Mh] Termos MeSH primário: Técnicas de Química Sintética
Processos Fotoquímicos
Compostos de Prata/química
Titânio/química
[Mh] Termos MeSH secundário: Luz
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Silver Compounds); 15FIX9V2JP (titanium dioxide); D1JT611TNE (Titanium); MWB0804EO7 (silver chloride)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171017
[St] Status:MEDLINE


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[PMID]:28837869
[Au] Autor:Yang Y; Tu R; Sun W; Zhu Z; Zhang Y
[Ad] Endereço:Key Laboratory of Resource Biology and Biotechnology in Western China (Northwest University), Ministry of Education, Xi'an 710069, China; Biomedicine Key Laboratory of Shaanxi Province, College of Life Science, Northwest University, Xi'an 710069, China.
[Ti] Título:Silver perchlorate in the mobile phase for rapid separation and determination of a pair of positional isomers in Inula racemosa Hook.f. with RP-HPLC.
[So] Source:J Chromatogr B Analyt Technol Biomed Life Sci;1063:25-30, 2017 Sep 15.
[Is] ISSN:1873-376X
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Alantolactone and isoalantolactone isolated from many species of plants are a pair of positional isomers of CC bond. Previously, alantolactone and isoalantolactone have been proved to be good lead compounds for future anticancer agent development. Similarity of their molecular structures increases the separation difficulty for these two isomers on a conventional C column. Silver perchlorate (AgClO ) as mobile phase additives with RP-HPLC for improving the separation was developed for rapid determination of the positional isomers in Inula racemosa Hook.f. The effects of the concentration of silver perchlorate on the separation of the analytes were investigated. The composition of acetonitrile and water containing 5.0% silver perchlorate in a 65:35 (v/v) ratio was used as mobile phase, in which they were well separated within a short period of time on the C column. The method was successfully applied to determine them in an extract of Inula racemosa Hook.f. root. Silver perchlorate in mobile phase can efficiently improve the separation of the positional isomers and could be applied to rapidly determinate their content in this plant.
[Mh] Termos MeSH primário: Cromatografia Líquida de Alta Pressão/métodos
Inula/química
Lactonas/isolamento & purificação
Percloratos/química
Sesquiterpenos de Eudesmano/isolamento & purificação
Sesquiterpenos/isolamento & purificação
Compostos de Prata/química
[Mh] Termos MeSH secundário: Acetonitrilos/química
Cromatografia de Fase Reversa/métodos
Isomerismo
Lactonas/análise
Lactonas/química
Extratos Vegetais/química
Raízes de Plantas/química
Sesquiterpenos/análise
Sesquiterpenos/química
Sesquiterpenos de Eudesmano/análise
Sesquiterpenos de Eudesmano/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acetonitriles); 0 (Lactones); 0 (Perchlorates); 0 (Plant Extracts); 0 (Sesquiterpenes); 0 (Sesquiterpenes, Eudesmane); 0 (Silver Compounds); 7783-93-9 (silver perchlorate); BYH07P620U (isoalantolactone); M7GSN5Q1M6 (alantolactone); Z072SB282N (acetonitrile)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170825
[St] Status:MEDLINE


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[PMID]:28664681
[Au] Autor:Moore CE; Gyenge EL
[Ad] Endereço:Department of Chemical and Biological Engineering, Clean Energy Research Centre, University of British Columbia, 2360 East Mall, Vancouver, BC, V6T 1Z3, Canada.
[Ti] Título:Tuning the Composition of Electrodeposited Bimetallic Tin-Lead Catalysts for Enhanced Activity and Durability in Carbon Dioxide Electroreduction to Formate.
[So] Source:ChemSusChem;10(17):3512-3519, 2017 Sep 11.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Bimetallic Sn-Pb catalysts with five different Sn/Pb atomic ratios were electrodeposited on Teflonated carbon paper and non-Teflonated carbon cloth using both fluoroborate- and oxide-containing deposition media to produce catalysts for the electrochemical reduction of CO (ERC) to formate (HCOO ). The interaction between catalyst composition, morphology, substrate, and deposition media was investigated by using cyclic voltammetry and constant potential electrolysis at -2.0 V versus Ag/AgCl for 2 h in 0.5 m KHCO . The catalysts were analyzed before and after electrolysis by using SEM and XRD to determine the mechanisms of Faradaic efficiency loss and degradation. Catalysts that are mainly Sn with 15-35 at % Pb generated Faradaic efficiencies up to 95 % with a stable performance. However, pure Sn catalysts showed high initial stage formate production rates but experienced an extensive (up to 30 %) decrease of the Faradaic efficiency. The XRD results demonstrated the presence of polycrystalline SnO after electrolysis using Sn-Pb catalysts with 35 at % Pb and its absence in the case of pure Sn. It is proposed that the presence of Pb (15-35 at %) in mainly Sn catalysts stabilized SnO , which is responsible for the enhanced Faradaic efficiency and catalytic durability in the ERC.
[Mh] Termos MeSH primário: Dióxido de Carbono/química
Galvanoplastia
Formiatos/química
Chumbo/química
Estanho/química
[Mh] Termos MeSH secundário: Catálise
Eletroquímica
Fluorcarbonetos/química
Oxirredução
Prata/química
Compostos de Prata/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Fluorocarbons); 0 (Formates); 0 (Silver Compounds); 0YIW783RG1 (formic acid); 142M471B3J (Carbon Dioxide); 2P299V784P (Lead); 3M4G523W1G (Silver); 7440-31-5 (Tin); MWB0804EO7 (silver chloride)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170918
[Lr] Data última revisão:
170918
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170701
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201700761


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[PMID]:28571858
[Au] Autor:Tomacheski D; Pittol M; Simões DN; Ribeiro VF; Santana RMC
[Ad] Endereço:Department of Materials Engineering, Laboratory of Polymers - LAPOL, Universidade Federal do Rio Grande do Sul, Porto Alegre 91501-970, Brazil; Softer Brasil Compostos Termoplásticos, Campo Bom 93700-000, Brazil. Electronic address: daitomacheski@gmail.com.
[Ti] Título:Effects of silver adsorbed on fumed silica, silver phosphate glass, bentonite organomodified with silver and titanium dioxide in aquatic indicator organisms.
[So] Source:J Environ Sci (China);56:230-239, 2017 Jun.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In order to reduce the level of transmission of diseases caused by bacteria and fungi, the development of antimicrobial additives for use in personal care, hygiene products, clothing and others has increased. Many of these additives are based on metals such as silver and titanium. The disposal of these products in the environment has raised concerns pertaining to their potential harmfulness for beneficial organisms. The objective of this study was to evaluate the influence of the shape, surface chemistry, size and carrier of three additives containing silver and one with titanium dioxide (TiO ) on microcrustacean survival. Daphnia magna was used as a bioindicator for acute exposure test in suspensions from 0.0001 to 10,000ppm. Ceriodaphnia dubia was used for chronic test in TiO suspensions from 0.001 to 100ppm. D. magna populations presented high susceptibility to all silver based additives, with 100% mortality after 24hr of exposure. A different result was found in the acute experiments containing TiO suspensions, with mortality rates only after 48hr of incubation. Even on acute and chronic tests, TiO did not reach a linear concentration-response versus mortality, with 1ppm being more toxic than 10,000ppm on acute test and 0.001 more toxic than 0.01ppm on chronic assay. Silver based material toxicity was attributed to silver itself, and had no relation to either form (nano or ion) or carrier (silica, phosphate glass or bentonite). TiO demonstrated to have a low acute toxicity against D. magna.
[Mh] Termos MeSH primário: Organismos Aquáticos/fisiologia
Testes de Toxicidade
Poluentes Químicos da Água/toxicidade
[Mh] Termos MeSH secundário: Animais
Bentonita/química
Bentonita/toxicidade
Fosfatos/química
Fosfatos/toxicidade
Dióxido de Silício/química
Dióxido de Silício/toxicidade
Prata/química
Prata/toxicidade
Compostos de Prata/química
Compostos de Prata/toxicidade
Titânio/química
Titânio/toxicidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Phosphates); 0 (Silver Compounds); 0 (Water Pollutants, Chemical); 1302-78-9 (Bentonite); 15FIX9V2JP (titanium dioxide); 3M4G523W1G (Silver); 7631-86-9 (Silicon Dioxide); D1JT611TNE (Titanium); ZL6T4Y1XP8 (silver phosphate)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170630
[Lr] Data última revisão:
170630
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170603
[St] Status:MEDLINE


  7 / 1683 MEDLINE  
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[PMID]:28521545
[Au] Autor:Lemire JA; Kalan L; Gugala N; Bradu A; Turner RJ
[Ad] Endereço:a The Biofilm Research Group, Department of Biological Sciences , University of Calgary , Calgary , Canada.
[Ti] Título:Silver oxynitrate - an efficacious compound for the prevention and eradication of dual-species biofilms.
[So] Source:Biofouling;33(6):460-469, 2017 Jul.
[Is] ISSN:1029-2454
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Preventing and eradicating biofilms remains a challenge in clinical and industrial settings. Recently, the present authors demonstrated that silver oxynitrate (Ag NO ) prevented and eradicated single-species planktonic and biofilm populations of numerous microbes at lower concentrations than other silver (Ag) compounds. Here, the antimicrobial and anti-biofilm efficacy of Ag NO is elaborated by testing its in vitro activity against combinations of dual-species, planktonic and biofilm populations of Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. As further evidence emerges that multispecies bacterial communities are more common in the environment than their single-species counterparts, this study reinforces the diverse applicability of the minimal biofilm eradication concentration (MBEC™) assay for testing antimicrobial compounds against biofilms. Furthermore, this study demonstrated that Ag NO had enhanced antimicrobial and anti-biofilm activity compared to copper sulfate (CuSO ) and silver nitrate (AgNO ) against the tested bacterial species.
[Mh] Termos MeSH primário: Anti-Infecciosos/farmacologia
Biofilmes/efeitos dos fármacos
Escherichia coli/efeitos dos fármacos
Nitratos/farmacologia
Plâncton/efeitos dos fármacos
Pseudomonas aeruginosa/efeitos dos fármacos
Compostos de Prata/farmacologia
Staphylococcus aureus/efeitos dos fármacos
[Mh] Termos MeSH secundário: Biofilmes/crescimento & desenvolvimento
Escherichia coli/crescimento & desenvolvimento
Testes de Sensibilidade Microbiana
Plâncton/crescimento & desenvolvimento
Pseudomonas aeruginosa/crescimento & desenvolvimento
Staphylococcus aureus/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Infective Agents); 0 (Nitrates); 0 (Silver Compounds)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171003
[Lr] Data última revisão:
171003
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170520
[St] Status:MEDLINE
[do] DOI:10.1080/08927014.2017.1322586


  8 / 1683 MEDLINE  
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[PMID]:28490010
[Au] Autor:Banerjee K; Das S; Choudhury P; Ghosh S; Baral R; Choudhuri SK
[Ad] Endereço:Department of In Vitro Carcinogenesis and Cellular Chemotherapy, Chittaranjan National Cancer Institute, Kolkata, India.
[Ti] Título:A Novel Approach of Synthesizing and Evaluating the Anticancer Potential of Silver Oxide Nanoparticles in vitro.
[So] Source:Chemotherapy;62(5):279-289, 2017.
[Is] ISSN:1421-9794
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Development of novel strategies to kill cancer by sparing normal cells is of utmost importance. Apart from their known antimicrobial activity, only limited information has been recorded regarding the antitumor potential of biocompatible silver oxide nanoparticles (AgONPs). There is a need to evaluate the anticancer potential of biocompatible AgONPs in vitro. METHODS: A new approach of utilizing the leaf extract of Excoecaria agallocha was used to synthesize AgONPs. This was then characterized by ultraviolet-visible spectrophotometry, nanoparticle-tracking analysis, and ζ-potential analysis. Cytotoxicity and apoptotic potential were evaluated with an MTT assay and an annexin V-binding assay against the murine melanoma (B16F10), murine colon cancer (CT26), murine lung adenocarcinoma (3LL), and murine Ehrlich ascites carcinoma (EAC) cell lines. Cellular localization of AgONPs was evaluated on fluorescence microscopy. RESULTS: UV peaks at 270 and 330 nm indicated the formation of nanoparticles (NPs) and the NP-tracking analyzer revealed them to have a size of 228 nm. AgONPs exerted initial cytotoxicity, specifically against all the experimental malignant cells by sparing the normal cell lines. Moreover, AgONPs exert apoptosis equally on all the malignant cells in vitro and ex vivo. This cytotoxicity possibly occurs via the nuclear translocation of AgONPs as analyzed in B16F10 cells. CONCLUSIONS: AgONPs utilizing natural sources would be a new medicinal approach against a broad spectrum of malignancy.
[Mh] Termos MeSH primário: Antineoplásicos/farmacologia
Apoptose/efeitos dos fármacos
Nanopartículas Metálicas/química
Óxidos/química
Extratos Vegetais/farmacologia
Compostos de Prata/química
[Mh] Termos MeSH secundário: Animais
Antineoplásicos/síntese química
Antineoplásicos/química
Linhagem Celular Tumoral
Núcleo Celular/metabolismo
Proliferação Celular/efeitos dos fármacos
Euphorbiaceae/química
Euphorbiaceae/metabolismo
Química Verde
Seres Humanos
Camundongos
Microscopia Confocal
Tamanho da Partícula
Extratos Vegetais/química
Folhas de Planta/química
Folhas de Planta/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Antineoplastic Agents); 0 (Oxides); 0 (Plant Extracts); 0 (Silver Compounds); 897WUN6G6T (disilver oxide)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170920
[Lr] Data última revisão:
170920
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170511
[St] Status:MEDLINE
[do] DOI:10.1159/000453446


  9 / 1683 MEDLINE  
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[PMID]:28481063
[Au] Autor:Zhu H; Pan M; Johansson MB; Johansson EMJ
[Ad] Endereço:Department of Chemistry- Ångström, Div. Physical Chemistry, Uppsala University, Box 523, SE-751 20, Uppsala, Sweden.
[Ti] Título:High Photon-to-Current Conversion in Solar Cells Based on Light-Absorbing Silver Bismuth Iodide.
[So] Source:ChemSusChem;10(12):2592-2596, 2017 Jun 22.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Here, a lead-free silver bismuth iodide (AgI/BiI ) with a crystal structure with space group R3‾ m is investigated for use in solar cells. Devices based on the silver bismuth iodide deposited from solution on top of TiO and the conducting polymer poly(3-hexylthiophene-2,5-diyl) (P3HT) as a hole-transport layer are prepared and the photovoltaic performance is very promising with a power conversion efficiency over 2 %, which is higher than the performance of previously reported bismuth-halide materials for solar cells. Photocurrent generation is observed between 350 and 700 nm, and the maximum external quantum efficiency is around 45 %. The results are compared to solar cells based on the previously reported material AgBi I , and we observe a clearly higher performance for the devices with the new silver and bismuth iodides composition and different crystal structure. The X-ray diffraction spectrum of the most efficient silver bismuth iodide material shows a hexagonal crystal structure with space group R3‾ m, and from the light absorption spectrum we obtain an indirect band gap energy of 1.62 eV and a direct band gap energy of 1.85 eV. This report shows the possibility for finding new structures of metal-halides efficient in solar cells and points out new directions for further exploration of lead-free metal-halide solar cells.
[Mh] Termos MeSH primário: Absorção de Radiação
Bismuto/química
Condutividade Elétrica
Fontes de Energia Elétrica
Iodetos/química
Fótons
Compostos de Prata/química
Energia Solar
[Mh] Termos MeSH secundário: Modelos Moleculares
Conformação Molecular
Titânio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Iodides); 0 (Silver Compounds); 15FIX9V2JP (titanium dioxide); 81M6Z3D1XE (silver iodide); BGX9X3FOLL (bismuth iodide); D1JT611TNE (Titanium); U015TT5I8H (Bismuth)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170726
[Lr] Data última revisão:
170726
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170509
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201700634


  10 / 1683 MEDLINE  
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[PMID]:28415506
[Au] Autor:Shen W; Li P; Feng H; Ge Y; Liu Z; Feng L
[Ad] Endereço:School of Materials Science and Engineering, Xi'an University of Technology, No. 5 South Jinhua Road, Xi'an 710048, China. Electronic address: shenwenning@qq.com.
[Ti] Título:The bactericidal mechanism of action against Staphylococcus aureus for AgO nanoparticles.
[So] Source:Mater Sci Eng C Mater Biol Appl;75:610-619, 2017 Jun 01.
[Is] ISSN:1873-0191
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:To identify the mechanistic effects of AgO nanoparticles on Gram-positive bacteria, S. aureus cells suspended in phosphate buffer solution (PBS) and deionized water were separately treated using AgO nanoparticles at different concentrations. The phase composition changes of the bactericide after killing S. aureus and the cellular responses of S. aureus to AgO were characterized by X-ray diffraction, atomic absorption spectrophotometer, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectroscopy. The results show that AgO nanoparticles could kill S. aureus suspended in PBS and deionized water. The bactericidal effect of AgO bactericide against S. aureus in water was better than that in PBS, due to the formation of Ag PO from the reaction between AgO and PBS. AgO nanoparticles exerted their bactericidal activity by multiple processes. AgO nanoparticles adhered to the surface of S. aureus cells firstly, then induced physical alterations in cell morphology and released silver ions, leading to initial injuries of cell membrane. Once membrane damage occurred, they entered the cells, and damaged the intracellular materials, eventually causing severe morphological and structural injuries to the cells and leakage of cytoplasm.
[Mh] Termos MeSH primário: Antibacterianos
Nanopartículas/química
Óxidos
Compostos de Prata
Staphylococcus aureus/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Antibacterianos/química
Antibacterianos/farmacologia
Óxidos/química
Óxidos/farmacologia
Compostos de Prata/química
Compostos de Prata/farmacologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Bacterial Agents); 0 (Oxides); 0 (Silver Compounds); 897WUN6G6T (disilver oxide)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170731
[Lr] Data última revisão:
170731
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170419
[St] Status:MEDLINE



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