Search Within
Applied Filters:
Palavra-chave:'326984'
Showing 1-30 of 139 resultados for "

326984

" within Papéis
Subin Poulose et al.
Journal of nanoscience and nanotechnology, 14(2), 2038-2049 (2014-04-23)
Metal nanoparticles have unique optical, electronic, and catalytic properties. There exist well-defined physical and chemical processes for their preparation. Those processes often yield small quantities of nanoparticles having undesired morphology, and involve high temperatures for the reaction and the use...
Judy M Obliosca et al.
Nanoscale, 5(18), 8443-8461 (2013-07-06)
Fluorescent silver nanoclusters (few atoms, quantum sized) have attracted much attention as promising substitutes for conventional fluorophores. Due to their unique environmental sensitivities, new fluorescent probes have been developed based on silver nanoclusters for the sensitive and specific detection of...
Fateme Mirzajani et al.
Ecotoxicology and environmental safety, 108, 335-339 (2014-08-16)
The increasing use of silver nanoparticles, (AgNPs), will inevitably result in their release into the environment and thereby cause the exposure to plants. It was claimed that using AgNPs is a safe and efficient method to preserve and treat agents...
Geon Joon Lee et al.
Journal of nanoscience and nanotechnology, 13(5), 3451-3454 (2013-07-19)
In this paper, we investigated the optical and structural properties of the Ag:Ta2O5 nanocomposites. The nanocomposite films were prepared by magnetron co-sputtering of Ta2O5 with Ag chips. The transmission electron microscopy images clearly revealed that Ag nanoparticles were successfully produced...
Hajo Haase et al.
Journal of biomedical nanotechnology, 10(6), 1146-1156 (2014-04-23)
Silver is commonly used as an antibacterial agent, e.g., in various medical applications, and the availability of silver nanoparticles (AgNP) has fueled this development. Their antibacterial properties are well defined, whereas there are concerns regarding unknown and potentially harmful effects...
A Barkhordari et al.
The international journal of occupational and environmental medicine, 5(3), 164-168 (2014-07-17)
Nanoparticles have become one of the leading technologies over the past two years. The extensive use of nanoparticles has raised great concern about their occupational fate and biological effects. With an increase in the production and use of nanomaterial, it...
Jung-Han Son et al.
Journal of nanoscience and nanotechnology, 13(11), 7235-7238 (2013-11-20)
Prism modules of 20 nm-, 40 nm-, and 60 nm-thick spin-coated silver films both without and with an upper 100 nm-thick spin-coated polymer layer were fabricated for surface plasmon resonance (SPR) image sensor applications. The prism modules were applied to...
Tina Künniger et al.
Environmental pollution (Barking, Essex : 1987), 184, 464-471 (2013-10-15)
This study represents for the first time a comprehensive assessment of functionality and environmental impacts of metallic silver nanoparticles (Ag-NP) compared to conventional organic biocides. Four different transparent, hydrophobic coatings of wooden outdoor façades were tested during one year outdoor...
M Baalousha et al.
The Science of the total environment, 502, 344-353 (2014-09-30)
Silver nanoparticles (Ag NPs) are susceptible to transformations in environmental and biological media such as aggregation, oxidation, dissolution, chlorination, sulfidation, formation/replacement of surface coatings following interaction with natural organic matter (NOM). This paper investigates the impact of surface coating and...
Elizabeth I Maurer et al.
Nanotoxicology, 8(7), 718-727 (2013-07-16)
In the field of toxicology of nanomaterials, scientists have not clearly determined if the observed toxicological events are due to the nanoparticles (NPs) themselves or the dissolution of ions released into the biophysiological environment or both phenomenon participate in combination...
Svitlana Chernousova et al.
Angewandte Chemie (International ed. in English), 52(6), 1636-1653 (2012-12-21)
The antibacterial action of silver is utilized in numerous consumer products and medical devices. Metallic silver, silver salts, and also silver nanoparticles are used for this purpose. The state of research on the effect of silver on bacteria, cells, and...
Hongyan Zhao et al.
Journal of nanoscience and nanotechnology, 14(6), 4357-4362 (2014-04-18)
The influence of 12 nm spherical silver nanoparticles (AgNPs) and 20 nm spherical gold nanoparticles (AuNPs) on the luminescence of europium complex Eu(TTFA)3 were studied. When 350 nm is chosen as the incident light, the maximum enhancement factor of the...
M Yazdimamaghani et al.
Journal of biomedical nanotechnology, 10(6), 911-931 (2014-04-23)
A new composition of gelatin/bioactive-glass/silver nanoparticle was synthesized and employed to prepare antibacterial macroporous scaffolds with potential applications in bone tissue engineering. A set of macroporous nanocomposite scaffolds were developed from an aqueous solution of gelatin by freeze-drying and crosslinking...
Ii-Ho Kim et al.
Journal of nanoscience and nanotechnology, 13(5), 3660-3664 (2013-07-19)
Ag-dispersed Bi0.5Sb1.5Te3 was prepared successfully by silver acetate (AgOAc) decomposition and hot pressing. The Ag nanoparticles were well-dispersed in the Bi0.5Sb1.5Te3 matrix, and acted as phonon scattering centers effectively. The electrical conductivity increased systematically with increasing amount of Ag nanoparticle...
Haifeng Qian et al.
Journal of environmental sciences (China), 25(9), 1947-1955 (2014-02-14)
Silver nanoparticles (AgNPs) are one of the most widely used nanomaterials, but the mechanism of AgNP toxicity in terrestrial plants is still unclear. We compared the toxic effects of AgNPs and Ag+ on Arabidopsis thaliana at the physiological, ultrastructural and...
Nanobio silver: its interactions with peptides and bacteria, and its uses in medicine.
Sonja Eckhardt et al.
Chemical reviews, 113(7), 4708-4754 (2013-03-16)
Florian Mallevre et al.
Environmental pollution (Barking, Essex : 1987), 195, 218-225 (2014-09-28)
Bacteria based ecotoxicology assessment of manufactured nanoparticles is largely restricted to Escherichia coli bioreporters in laboratory media. Here, toxicity effects of model OECD nanoparticles (Ag NM-300K, ZnO NM-110 and TiO2 NM-104) were assessed using the switch-off luminescent Pseudomonas putida BS566::luxCDABE...
S R Mueller-Spitz et al.
Letters in applied microbiology, 58(4), 330-337 (2013-11-30)
Polycyclic aromatic hydrocarbons (PAH) are a common environmental contaminant originating from both anthropogenic and natural sources. Mycobacterium species are highly adapted to utilizing a variety of PAH. Silver nanoparticles (AgNP) are an emerging contaminant that possess bactericidal properties, interferes with...
Direct laminating of silve foils on copper substrate.
Wang PJ, et al.
Journal of Materials Science: Materials in Electronics, 19, 1097-1099 (2008)
Takuya Nishioka et al.
Ultrasonics, 57, 84-89 (2014-12-04)
A thermophone is a thermoacoustic transducer, which generates sound via time-varying Joule heating of an electrically conductive layer, which leads to expansion and contraction of a small pocket of air near the surface of the film. In this work, a...
Jiunn-Woei Liaw et al.
Journal of nanoscience and nanotechnology, 13(10), 6627-6634 (2013-11-20)
The longitudinal plasmon modes of an elongated Ag nanorod induced by an obliquely incident plane wave were analyzed theoretically. Our results show that the proximities at the two apexes of the nanorod are the hotspots at the dipole (m =...
Alexandros Besinis et al.
Nanotoxicology, 8(7), 745-754 (2013-07-24)
The survival of pathogenic bacteria in the oral cavity depends on their successful adhesion to dental surfaces and their ability to develop into biofilms, known as dental plaque. Bacteria from the dental plaque are responsible for the development of dental...
Yang Liu et al.
Chemosphere, 112, 282-288 (2014-07-23)
Metals are always found in the environment as mixtures rather than as solitary elements. However, effect models such as biotic ligand models (BLMs) are usually derived for toxicity prediction of single metals. Our study aimed at predicting mixture toxicity of...
Merel J C van der Ploeg et al.
Environmental toxicology and chemistry, 33(4), 743-752 (2013-12-10)
The impact of silver nanoparticles (AgNP; at 0 mg Ag/kg, 1.5 mg Ag/kg, 15.4 mg Ag/kg, and 154 mg Ag/kg soil) and silver nitrate (AgNO3 ; 15.4 mg Ag/kg soil) on earthworms, Lumbricus rubellus, was assessed. A 4-wk exposure to...
Hongjun Liu et al.
Journal of water and health, 12(4), 670-677 (2014-12-05)
Pathogenic bacteria are one of the main reasons for worldwide water-borne disease causing a big threat to public health, hence there is an urgent need to develop cost-effective water treatment technologies. Nano-materials in point-of-use systems have recently attracted considerable research...
Iu P Mukha et al.
Prikladnaia biokhimiia i mikrobiologiia, 49(2), 215-223 (2013-06-26)
Conditions for obtaining stable silver nanoparticles smaller than 10 nm were developed using a binary stabilizer polyvinylpyrrolidone/sodium dodecylsulphate in optimal ratio. Optical spectra, morphology and dependence of size of the nanoparticles on the amount of reducing agent were studied. Colloidal...
Chin-Lin Huang et al.
Environmental research, 136, 253-263 (2014-12-03)
Silver nanoparticles (AgNPs) have antibacterial characteristics, and currently are applied in Ag-containing products. This study found neural cells can uptake 3-5 nm AgNPs, and investigated the potential effects of AgNPs on gene expression of inflammation and neurodegenerative disorder in murine...
Kheyrollah Khosravi Katuli et al.
Ecotoxicology and environmental safety, 106, 173-180 (2014-05-21)
Silver nanoparticles (AgNPs) are the most commonly used metallic nanoparticles in industrial applications, including medical and consumer products. In the recent years, however, concerns regarding their environmental and health impacts have emerged. Aquatic organisms are of special concern since water...
Susanne Sütterlin et al.
Applied and environmental microbiology, 80(22), 6863-6869 (2014-08-17)
Members of the Enterobacteriaceae with extended-spectrum beta-lactamases (ESBLs) of the CTX-M type have disseminated rapidly in recent years and have become a threat to public health. In parallel with the CTX-M type expansion, the consumption and widespread use of silver-containing...
Germán Plascencia-Villa et al.
Journal of nanoscience and nanotechnology, 13(8), 5572-5579 (2013-07-26)
Self-assembled structures derived of viral proteins display sophisticated structures that are difficult to obtain with even advanced synthesis methods and the use of protein nanotubes for synthesis and organization of inorganic nanoarrays into well-defined architectures are here reported. Nanoparticle arrays...
Página 1 de 5
Página 1 de 5