Thematische Bibliographien / Nano Silver and Silver Ions

Inhaltsverzeichnis

  1. Zeitschriftenartikel
  2. Dissertationen
  3. Bücher
  4. Buchteile
  5. Konferenzberichte
  6. Berichte der Organisationen

Auswahl der wissenschaftlichen Literatur zum Thema „Nano Silver and Silver Ions“

Autor: Grafiati
Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Nano Silver and Silver Ions"

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Gupta, Ajay. „Silveron Gel (Nano Silver Formulation): A Powerful Antimicrobial for the Future“. New Indian Journal of surgery 12, Nr. 4 (15.12.2021): 209–13. http://dx.doi.org/10.21088/nijs.0976.4747.12421.2.

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Introduction: Nano silver itself is not new. It has been used for various applications in consumer and commercial products over the past century without showing adverse effects on patients. Nano-silver dispersions were used as medical products already in the 19th century. Additionally, the concept of Nano-silver being used as a topical antibacterial dates back to the days of Sushrut in the 6th century where finely powdered Silver was used as a topical antibacterial/antiseptic after surgery. Material and Method: Silver ions and the compounds made like nanosilver exhibit a broad antimicrobial profile against bacteria, fungi and virus and also have low toxicity towards animal cells. Various studies have also demonstrated definitive antibacterial property of nanosilver against Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, C. albicans, V. Parahaemolyticus, S. enterica, B. anthracis, B. Cereus, Bacillus subtilis, Salmonella entrica and Pseudomonas aeruginosa. Result: Nano silver particles have ability to alter the expression of matrix metallo-proteinases (proteolytic enzymes that are important in various inflammatory and repair processes), suppress the expression of tumor necrosis factor (TNF-α), interleukin (IL)-12, and IL-1b, and induce apoptosis of inflammatory cells. Therefore, nano silver gel also displays an anti-inflammatory action. Conclusion: In conclusion, Silveron gel due to its nano silver particles and unique formulation has the power to protect, penetrate, and heal in cuts, wounds, burns, diabetic foot ulcer, and surgical dressings. Keywords: Silveron Gel; Antimicrobial; Nano Silver.
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Igashira, Hiroaki, Michimasa Kamo, Masayuki Kyomoto und Toshiyuki Ikoma. „Fabrication of hydroxyapatite microparticles including silver nano-dots at grain boundary for long-term antimicrobial property“. MRS Advances 2, Nr. 24 (23.12.2016): 1285–90. http://dx.doi.org/10.1557/adv.2016.650.

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ABSTRACTThe antibacterial properties are useful to restrain inflammatory response caused by bacterial infection after implantation. The composites of hydroxyapatite (HAp) and silver nano-dots, silver oxide or silver phosphate have been investigated; however there are still some disadvantage in sintering; 1) silver nano-dots grow large, and are not homogenously distributed, 2) silver nano-dots melt and remove, and 3) silver phosphate and silver oxide formed exhibit higher solubility than metal silver. In this study, the distribution of silver nano-dots in HAp microparticles sintered was controlled at grain boundary with a modified silver mirror reaction as a novel route. HAp microparticles adsorbed formaldehyde by a vapor deposition method were soaked in an ammoniacal silver nitrate solution and were then sintered. There was a single phase of HAp including metal silver at 6.4 wt% even after sintering. The silver nano-dots were homogeneously distributed inside the microparticles. The release profiles of silver ions in phosphate buffer saline were compared with a reference; the HAp microparticles were soaked into silver nitrate solution and were then sintered. The distribution of silver in the reference was not homogeneous and large silver microparticles were grown outside the particles at 6.3wt%. The elution amount of silver ions from the microparticles at 12 hours was one-eighteenth of that from the reference. These results suggest that the HAp microparticles including silver nano-dots at grain boundary will be suitable for a long-term antibacterial material.
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Tseng, Kuo-Hsiung, Heng-Lin Lee, Chih-Yu Liao, Kuan-Chih Chen und Hong-Shiou Lin. „Rapid and Efficient Synthesis of Silver Nanofluid Using Electrical Discharge Machining“. Journal of Nanomaterials 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/174939.

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The electrical discharge machining (EDM) system has been proven feasible as a rapid and efficient method for silver nanofluid preparation. This study prepared the silver nano-fluid via EDM and investigated the relationship between its process parameters and product characteristics. The prior study had found that the silver nano-fluid prepared by EDM contained both silver nanoparticles and silver ions. Silver ions had revealed the cause of the high suspension of the silver nanoparticles. To examine the relationship between the stability of silver nanofluid and the process parameters, this study quantified the relationship of process parameters to the material removal rate (MRR) of silver electrode and silver ion output rate (IOR) in the fluid, in order to achieve the most effective process parameter condition. Furthermore, the stability of silver nano-fluid was analyzed by various devices, including UV-Vis spectroscopy, size-distribution, and Zeta-potential analyzer. The effects of MRR, IOR, particle size, Zeta-potential, and optical properties of silver nanofluid under different process parameters are also discussed.
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Patwari D, Rajeshree, und B. Eraiah. „Enhanced Luminescence of Silver Nano-particles Doped Na2O-BaO-Borate Glasses“. Journal of Materials and Applications 9, Nr. 2 (15.11.2020): 107–19. http://dx.doi.org/10.32732/jma.2020.9.2.107.

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Na2O-BaO-Borate glasses were synthesized with silver nano-particles of varying silver concentrations by the method of melt-quenching. Their densities of the glasses and hence molar volumes were computed. The existence of the silver nano-particles was depicted by characteristic band in the absorption spectra of UV- Visible studies known as plasmon band. Further the matrix also showed a small amount of nanostructures of the host which imparts the nonlinear behaviour. They were further visualized by the Scanning and Transmission electron microscopy. Optical band gap and Urbach energies were found. The band gap values change exactly in the opposite manner of density with silver doping. The wide luminescence band in the visible region formed for the excitation of plasmon band may be utilized for the luminescence enhancement of luminescent material like rare earth ions. The very significant result perceived from this is that the glass as such with silver nano-particles showed broad emission in the, green & blue portions of electromagnetic spectrum in the close vicinity of white light with the variation of silver content which can be utilized for the enrichment of the emission of lanthanide ions in the visible section of electro-magnetic spectrum.
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Jang, Kuewhan, Juneseok You, Chanho Park und Sungsoo Na. „Highly sensitive detection of silver ions using a silver-specific DNA based nano-porous micro-resonator“. New Journal of Chemistry 41, Nr. 4 (2017): 1840–45. http://dx.doi.org/10.1039/c6nj03776c.

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Li, Huigai, Ling Lin, Meizhen Wang, Xuan Wang und Ming Wan. „Influence of nano-fiber membranes on the silver ions released from hollow fibers containing silver particles“. Thermal Science 20, Nr. 3 (2016): 859–62. http://dx.doi.org/10.2298/tsci1603859l.

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Polyether sulfone was dissolved into dimethylacetamide with the concentration of 20% to prepare a uniform solution for fabrication of nanofiber membranes by bubble electrospinning technique. Morphologies of the nanofiber film were carried out with a scanning electron microscope. The influence on the silver ions escaped from hollow fiber loaded with silver particles was exerted by using different release liquid. The water molecular clusters obtained from the nanofiber membranes filter can slow down the release of silver ions. However, the effect of slowing was weakened with the time increasing. In the end, the trend of change is gradually consistent with the trend of release of silver ions in the deionized water.
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Zhou, Yi Han. „Preparation and Antibacterial Properties of Silver Nanowires“. Materials Science Forum 944 (Januar 2019): 686–91. http://dx.doi.org/10.4028/www.scientific.net/msf.944.686.

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Silver ions have superior bactericidal properties, and their bactericidal activity ranks second among all metals (mercury ranks first, toxic, not used now). Due to its unique physical and chemical properties, nano-silver has also received increasing attention from researchers, and its antibacterial properties are far superior to traditional silver ion bactericides, such as silver nitrate and silver sulfadiazine. But the properties and performance of nanosilver materials depend on their size and morphology.In this paper, the nano-silver line was prepared by the polyol method. By controlling the ratio of AgNO3and PVP, the concentration of NaCl and the acidity and alkalinity of the reaction solution, the effects of reaction time and reaction temperature on the morphology and diameter of the silver wire were investigated. The antibacterial properties of nanosilver were determined by the perforation inhibition method. The experimental results showed that as the reaction temperature increased, the silver particles in the product decreased significantly, the diameter of the silver wire tended to be uniform, but the diameter increased. Finally, the optimal reaction temperature for preparing the silver oxide wire by the polyol method was 150 °C, the reaction time was 10 hours, and the diameter of the silver wire was 100 nm to 200 nm. Based on the measurement of the antibacterial diameter of nano-silver with different morphologies on Escherichia coli and Staphylococcus aureus, it can be found that nano-silver with different morphologies has excellent antibacterial effect, and silver cube is superior to silver particles and nano-silver lines.
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Zhang, Haiping, Jixing Cui, Jesse Zhu, Yuanyuan Shao und Hui Zhang. „Fabrication of Nano-Silver–Silver Ion Composite Antibacterial Agents for Green Powder Coatings“. Coatings 13, Nr. 3 (07.03.2023): 575. http://dx.doi.org/10.3390/coatings13030575.

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Nano-silver is characterized by broad-spectral, strong and stable antibacterial properties, which make it a promising material in coating applications. However, the efficiency of nano-silver is generally low in the coating of films. Here, we developed a series of highly active and durable silver ions–nano-silver antimicrobial agents for powder coatings. To optimize antimicrobial activity and durability, two different nano-silver generation methods, i.e., in situ and ex situ methods combined with different carrier materials, i.e., zeolite with high ion-exchange ability and montmorillonite of layered structure were adopted and investigated. All four antibacterial additives show high activity with a reduction rate of over 99.99% and R value of over 5. The ex situ generated nano-silver antibacterial agents with both carriers exhibit higher activity in the initial antibacterial property and antibacterial durability that the coating films are able to maintain over 99% antimicrobial reduction after 20 cycles (1200 times) of soap solution wiping. They also show a lower yellowish color difference of less than three compared to the films with in situ generation method. The one with montmorillonite as carrier shows the stronger antibacterial property with an R value of 5.88 and slightly better film appearance of lower color difference, smaller reduction in gloss and increase in haze as compared to zeolite carrier due to the layered structure.
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Abdelghany, A. M., A. H. Oraby, Awatif A. Hindi, Doaa M. El-Nagar und Fathia S. Alhakami. „Green synthesis of mixed metallic nanoparticles using room temperature self-assembly“. JOURNAL OF ADVANCES IN PHYSICS 13, Nr. 2 (16.03.2017): 4671–77. http://dx.doi.org/10.24297/jap.v13i2.5942.

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Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.
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Song, Junfei, Pengfei Zhang, Lu Cheng, Yue Liao, Bing Xu, Rui Bao, Wei Wang und Wenguang Liu. „Nano-silver in situ hybridized collagen scaffolds for regeneration of infected full-thickness burn skin“. Journal of Materials Chemistry B 3, Nr. 20 (2015): 4231–41. http://dx.doi.org/10.1039/c5tb00205b.

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Dissertationen zum Thema "Nano Silver and Silver Ions"

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Das, Dipayan. „Application of nano silver and silver ions in preservation of mulberry leaves and their utilization in silkworm rearing system“. Thesis, University of North Bengal, 2021. http://ir.nbu.ac.in/handle/123456789/4753.

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Das, Dipayan. „Application of nano silver and silver ions in preservation of mulberry leaves and their utilization in silkworm rearing system“. Thesis, University of North Bengal, 2021. http://ir.nbu.ac.in/handle/123456789/4752.

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Dhoubhadel, Mangal S. „Synthesis and Characterization of Ion Beam Assisted Silver Nanosystems in Silicon Based Materials for Enhanced Photocurrent Collection Efficiency“. Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc799502/.

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In recent years a great deal of interest has been focused on the synthesis of transitional metal (e.g. Ag, Cu, Fe, Au) nanosystems at the surface to sub-surface regions of Si and SiO2 matrices for fundamental understanding of their structures as well as for development of technological applications with enhanced electronic and optical properties. The applications of the metal nanoparticle or nanocluster (NC) systems range from plasmonics, photovoltaic devices, medical, and biosensors. In all of these applications; the size, shape and distribution of the metallic NCs in the silicon matrix play a key role. Low energy ion implantation followed by thermal annealing (in vacuum or gas environment) is one of the most suitable methods for synthesis of NCs at near surfaces to buried layers below the surfaces of the substrates. This technique can provide control over depth and concentration of the implanted ions in the host matrix. The implanted low energy metal ions initially amorphizes the Si substrates while being distributed at a shallow depth near the substrate surface. When subject to thermal annealing, the implanted ions agglomerate to form clusters of different sizes at different depths depending upon the fluence. However, for the heavier ions implanted with high fluences (~1×1016 - 1×1017 atoms/cm2), there lies challenges for accurately predicting the distribution of the implanted ions due to sputtering of the surface as well as redistribution of the implants within the host matrix. In this dissertation, we report the investigation of the saturation of the concentration of the implanted ion species in the depth profiles with low energies (< 80 keV) metal ions (Ag and Au) in Si (100), while studying the dynamic changes during the ion implantation. Multiple low energies (30-80 keV) Ag ions with different fluences were sequentially implanted into commercially available Si wafers in order to facilitate the formation of Ag NCs with a wide ion distributions range. The light absorption profile according to different sizes of NCs at the near-surface layers in Si were investigated. We have investigated the formation of Ag NCs in the Si matrix as a function of implantation and thermal annealing parameters. The absorbance of light is increased in Ag implanted Si with a significant increase in the current collection in I-V (current-voltage) photo switching measurements. The experimental photovoltaic cells fabricated with the Ag implanted Si samples were optically characterized under AM (air mass) 1.5 solar radiation conditions (~1.0 kW/m2). An enhancement in the charge collection were measured in the annealed samples, where prominent Ag NCs were formed in the Si matrix compared to the as-implanted samples with the amorphous layer. The characterization techniques such as Rutherford Backscattering Spectroscopy, XPS-depth profiling, transmission electron microscopy, optical absorption, and I-V (current-voltage) photo switching measurements were employed to understand the underlying science in the observed properties. The results of these investigations are discussed in this research.
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Zhang, Li 1973. „Shockwave consolidation of nano silver powder into bulk nano structured silver“. Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100238.

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Bulk nanostructured silver components were fabricated from nano-sized powder using a shockwave consolidation technique. The grain size evolution during compaction, the mechanical properties of the bulk components, and the effect of surface finish on the mechanical behavior were studied. X-Ray diffraction, transmission electron microscopy (TEM), atomic force microscopy (AFM), microhardness, compression testing and shear punch testing at room temperature were used to characterize the materials. Upon consolidation, the average grain size calculated from image analysis of the TEM micrographs was 49+/-22 nm, showing the feasibility of maintaining a nanostructure upon dynamic consolidation. The hardness of the bulk nanostructured components was constant across the diameter with an average of 83+/-1 HV. Compression results showed strength about 390+/-10 MPa and ductility of 23+/-2%, which is well above strength level obtainable from strain hardened Ag components. The AFM results show that samples possessing a surface roughness of 267 nm exhibited a brittle behavior and a reduction in strength of 35% when compared to the smoother surfaces. Dimples were observed for the samples exhibiting plasticity, while an intergranular pattern was identified for the brittle materials. Fracture toughness of 0.2 MPa m was calculated, which confirms the strong relationship between fracture toughness and defects observed in nanomaterials.
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Singh, Deirdre Mary. „Electroanalysis of chloride, bromide and silver ions“. Thesis, University of Newcastle Upon Tyne, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363540.

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Toh, Her Shuang. „Electrochemistry of silver nanoparticles“. Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:7b9c8a2f-6599-446e-a0b3-cb33ca39e476.

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This thesis presents findings realising two main objectives. The first aim is to investigate the electrochemical detection of nanomaterials with an emphasis on silver nanoparticles. The second goal is to employ silver nanoparticles in electroanalysis to aid in the detection of other analytes. First, the detection of silver nanoparticles was demostrated through two different electrochemical methods, stripping voltammetry and 'nano-impacts'. For stripping voltammetry, the potential of metallic nanoparticles oxidation was quantified by various new analytical expressions for peak potential. For the novel method of 'nano-impacts', individual silver nanoparticles were successfully detected in an optically opaque suspension. Then, a comparison between the two techniques was achieved via the oxidation of silver nanoparticles with different capping agents. Strong capping agent effects was found for stripping voltammetry and one may markedly underestimate the amount of silver nanoparticle present on the electrode surface. The electrochemical sizing of nanoparticles via 'nano-impacts' remained unaffected by the capping agent effect. Amidst the study on the various types of capping agent, it was discovered that cetyltrimethylammonium bromide (CTAB) is electroactive due to the oxidation of its bromide content. This inspired the use of 'nano-impacts' to detect the presence of large CTAB micelles which self-assembled at concentrations above the critical micelle concentration. Next, various types of silver nanoparticles were applied to different electroanalytical systems to aid in the measurement of other analytes. (a) Small silver nuclei, remaining after the oxidative stripping of an electrode modified by silver nanoparticle suspension drop casting, allowed subsequent signal enhancement (at least a factor of three) in anodic stripping voltammetry of silver ions. (b) The thermodynamic favourable formation of silver halide complexes allowed the silver nanoparticle modified electrode to analyse the halide content of a solution. Hence, a proof-of-concept for an electrochemical sensor based on silver nanoparticle modified electrode for chloride ions was established. This might be applied to the pre-screening of cystic fibrosis, a genetic disease detrimental to many infants' lives. (c) Another key halide in human body, iodide ions, was also measured using a related concept. The level of iodide ions in synthetic human urine was determined. Last, the strong affinity of silver to thiol groups also warranted a study devoted to their interaction through electrochemical and spectroscopic measurements. It was found that there is no general mechanism for silver-thiol interaction and each thiol must be treated as a separate entity.
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Kanungo, Jyotirmayee. „Optical characterization of silver nano-wire metamaterials“. Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557635.

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Silver nanowires with diameters of a few tens of nanometers have gained a lot interest recently. An array of such nanowires within a dielectric host matrix are considered as an indefinite anisotropic metamaterial. These metamaterials exhibit negative refraction due to hyperbolic dispersion characteristics for extraordinary waves. The overall purpose of this research is to study the optical characteristics of such an indefinite system. First, an analytical formula was developed which describes the image formation due to a plane parallel slab of such a metamaterial for light emanating from a point source. The results of this analytic flat lens equation were compared with two- dimensional (2D) full wave simulations. One of the objectives of this work was to fabricate such delicate nanostructures. This was achieved by nano-porous alumina templates obtained following the novel two step anodization procedure. Afterwards an electrochemical plating technique was applied to deposit silver into the nano-channels forming a silver nanowire array. The inter-wire distance was only 60 nm so the metamaterial is considered as an effective medium for visible and infrared (IR) light. The optical characteristics of such a system were studied using angular resolved transmission measurements. In particular, a thorough analysis of the transmitted light was applied to determine the principal effective dielectric constants in the visible and IR range. In addition the equifrequency surfaces of the ordinary and extraordinary waves were mapped experimentally in a wave vector diagram for the first time. A comparison of the experimental results with Maxwell-Garnett effective medium theory showed a very good agreement and confirmed the original prediction that the silver nanowire arrays can be described as uniaxial indefinite metamaterials within visible and IR region.
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Babaahmadi, V., M. Ghanbarajjeh, T. Toliyat und M. Montazer. „Photochemical reduction of silver nitrate to nano silver using stannous chloride, ctab and daylight irradiation“. Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20633.

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Silver nanoparticles (NPs) were synthesized and stabilized by a simple method in aqueous solution, by the reduction of silver nitrate with stannous chloride (SnCl2.2H2O) and cetyl trimethyl ammonium bromide (CTAB)through day light irradiation. Thereby, the silver nanoparticles were colloidally stabilized by CTAB as a surfactant. The synthesis of silver NPs with different size were possible by changing the reaction conditions such as reagent ratio. The silver NPs were characterized by Dynamic Light Scattering (DLS) and UV-visible spectroscopy. A very strong plasmon resonance peak at 400-500 nm in the UV-visible spectra is a clear consequence of the silver NPs production. The synthesized silver NPs showed good stability by using CTAB. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/20633
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Torres, Urquidy Oscar Hernando. „Copper Resistant Bacteria Better Tolerate Commercially Available Antimicrobial Treatments Based in Silver and Silver-Copper Ions“. Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202734.

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In the current study, the antibacterial efficacy of zeolites containing silver or copper ions or a combination of these metals was assessed against several diverse copper resistant (CuR) and copper sensitive (CuS) strains of clinically relevant bacterial species. CuR Pseudomonas putida was significantly reduced in comparison to the unamended zeolite control. Unexpectedly, a CuS P. putida strain with no reported metal resistance appeared to be more resistant to the zeolite containing either Ag or Ag/Cu than the CuR strain. Contrary to expectations, after three and six hours of exposure, the CuS Escherichia coli displayed significantly more resistance to the Ag/Cu and Cu treatments than the reportedly CuR E. coli. All three reportedly CuR strains of Salmonella enterica exhibited resistance to Cu and Ag, as well as to the combination of the two metals after three and six hours of exposure. The reductions observed after 24 hours for all three CuR strains with Cu alone were still statistically significant compared to that of the CuS S. enterica strain. In addition, two of the CuR strains were more resistant to silver after 24 hours of exposure, suggesting a shared resistance mechanism such a copper efflux pump that also removes silver ions from the cell. Both the CuR and CuS strains of E. faecium were highly resistant to all of the treatments. In general, after comparison of all the resistances with all the treatments, E. faecium was the most resistant species, P. putida was the least resistant species, and the Salmonella strains were more resistant than E. coli in most cases.
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Rawson, C. Josephine. „Investigations of novel receptors for binding and sensing silver ions“. Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362120.

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Bücher zum Thema "Nano Silver and Silver Ions"

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Conrad, Gary W. Effects of silver and other metals on the cytoskeleton: Summary of research : 02/15/95-06/30/97. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Silver Nano/Microparticles. MDPI, 2020. http://dx.doi.org/10.3390/books978-3-03943-205-9.

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Sabir, Syed. Silver Recovery from Assorted Spent Sources: Toxicology of Silver Ions. World Scientific Publishing Co Pte Ltd, 2018.

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Silver Nano/microparticles: Modification and Applications. MDPI, 2019. http://dx.doi.org/10.3390/books978-3-03921-178-4.

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Bong-Hyun, Jun, und Rho Won-Yeop. Silver Nano/microparticles: Modification and Applications. Mdpi AG, 2019.

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Linliu, Kung. Simple LED Lighting Circuit with Nano Silver Ink Pen. Independently Published, 2020.

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Postma, James M., J. Leland Hollenberg und Julian Roberts. Identification of Silver, Lead, and Mercurous Ions: Separate from Chemistry in the Laboratory 5e. W. H. Freeman, 2000.

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Buchteile zum Thema "Nano Silver and Silver Ions"

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Köse, Nusret, Aydan Ayşe Köse, Ayşe Gül Toktaş und Aydın Doğan. „Presenting and Treating Bone Infections Using Silver Ion Containing Nano-hydroxyapatite“. In Nanotechnology in the Life Sciences, 257–67. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64410-9_13.

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Miyayama, Takamitsu, Yuta Arai und Seishiro Hirano. „Health Effects of Silver Nanoparticles and Silver Ions“. In Current Topics in Environmental Health and Preventive Medicine, 137–47. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55732-6_7.

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Zhang, Hua, Meng Wu und Ayusman Sen. „Silver Nanoparticle Antimicrobials and Related Materials“. In Nano-Antimicrobials, 3–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24428-5_1.

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Pollini, M., F. Paladini, A. Licciulli, A. Maffezzoli und A. Sannino. „Engineering Nanostructured Silver Coatings for Antimicrobial Applications“. In Nano-Antimicrobials, 313–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24428-5_11.

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Tiggesbäumker, J., L. Köller, H. O. Lutz und K. H. Meiwes-Broer. „Collective Excitations in Silver Cluster Ions“. In Physics and Chemistry of Finite Systems: From Clusters to Crystals, 1001–6. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-2645-0_135.

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Mokula, Mohammed Raffi, und Azamal Husen. „Toxicity Assessment of Silver Nanoparticles and Silver Ions on Plant Growth“. In Nanomaterials and Nanocomposites Exposures to Plants, 157–74. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2419-6_7.

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Wang, Desong, Jing An, Qingzhi Luo, Xueyan Li und Luna Yan. „Synthesis, Characterization and Application of Silver-Based Antimicrobial Nanocomposites“. In Nano-Antimicrobials, 47–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24428-5_2.

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Rai, Mahendra, Alka Yadav und Nicola Cioffi. „Silver Nanoparticles as Nano-Antimicrobials: Bioactivity, Benefits and Bottlenecks“. In Nano-Antimicrobials, 211–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24428-5_7.

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Gupta, Indarchand, Nelson Duran und Mahendra Rai. „Nano-Silver Toxicity: Emerging Concerns and Consequences in Human Health“. In Nano-Antimicrobials, 525–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24428-5_18.

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Duhamel, Cécilie, Jean-Louis Bonnentien, Michael Walls, Martin Hÿtch und Yannik Champion. „Synthesis and Processing of Silver Doped Copper Nanopowders“. In Nano-Architectured and Nanostructured Materials, 38–45. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527606017.ch6.

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Konferenzberichte zum Thema "Nano Silver and Silver Ions"

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Singh, Prabjit, Larry Palmer, James Demarest, Larry Fischer, George Hutt, Gary Thompson, William Brodsky und James R. Lloyd. „Silver-on-Silver versus Tin-on-Silver Electrical Connectors for High Current and High Vibration Applications“. In ISTFA 2005. ASM International, 2005. http://dx.doi.org/10.31399/asm.cp.istfa2005p0027.

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Abstract Contrary to known art, we have discovered that lubricated tin-silver connectors have better electrical performance and are more reliable than lubricated silver-silver connectors under high-current and high-vibration conditions. The antifretting lubricant, that enhances the performance and reliability of the tin-silver connectors, is a grease consisting of a hydrocarbon oil in a nano-sized silica-particle base. Focused ion beam and scanning electron microscopy were used to understand the contact degradation mechanism. The superior electrical performance and reliability of the lubricated tin-silver connectors is due to a mechanism that replaces the tin plating from the contact surface with a coating of silver. The removal of the tin plating may be due to wear and the replacement by the silver coating may be due to an electrochemical displacement reaction.
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Wasiewska, L., G. Duffy, K. Burgess und A. O'Riordan. „Reagent-free electrochemical-based detection of silver ions in aqueous solutions using localized pH control“. In 2018 IEEE 18th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2018. http://dx.doi.org/10.1109/nano.2018.8626361.

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Hsu, Keng H., Placid M. Ferreira und Nicholas Fang. „Direct Nanopatterning With Solid Ionic Stamping“. In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13441.

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Among the subtractive fabrication techniques nanoimprint lithography followed by metal etching processes3,4,5 provides features with size down to tens of nanometers6,7. With the aid of high strength tool, the resolution of electrochemical machining (ECM) has been pushed to sub-hundred nanometer regime4. As much as the high resolution it is capable of, nanoimprint lithography followed by metal etching processes bears the multi-step, complex lithography processes that require stringent process environment control and high-cost equipments. Similarly, the pattern dimension fidelity and pattern geometry of the transferred feature is limited by the current density distribution in the liquid-state electrolyte and its physical properties. Effort has been on developing patterning techniques and logic devices that are based on the ionic mass transport property in solid electrolytes. A quantized conductance atomic switch that operates at 1MHz with 0.6V of driving potential has been developed wherein silver mobile atoms bridges and opens the tunneling gap between Pt and silver sulfide wires when driven by a gate potential8. Nanopatterning techniques utilizing local metal cluster deposition and dissolution have also been developed to achieve sub-hundred nanometer line writing and dot deposition with scanning probe microscopy9,10,11. Here we present a novel solid state ionic subtractive stamping technique which provides nanoscale patterning of metallic features with high resolution. Developed based upon a single-step electrochemical material dissolution process in ambient conditions, this technique offers high throughput and high fidelity in metal pattern transfer at nanoscale, as well as the flexibility to be used for various kinds of metals and to be integrated with other nano-fabrication techniques for applications such as chemical sensors and photonic structures. Shown in Figure 1 is a model of ionic migration of silver species in a solid-state ionic conductor, silver sulfide. When subjected to an electric field applied across a silver-silver sulfide interface through anode and cathode attached to them respectively, in achieving the equilibrium of the electrochemical potential of silver atoms in the silver substrate and that in silver sulfide, silver atoms in the substrate oxidize into mobile ions and electrons. These mobilized silver ions then move freely from the interface through the conduction channels in the silver sulfide bulk towards the cathode. Upon receiving electrons when reaching cathode, silver ions reduce back to atoms and deposit on the interface between the cathode and Ag2S. The oxidation at the interface between anode and Ag2S is an ideal tool for surface micromachining in that mass transport only occurs at the portion of the surfaces of anode where actual physical contact exists, making it an ideal tool for pattern transfer. In our preliminary experiments, silver sulfide and silver substrate were chosen and stamping apparatus was built to perform solid state ionic subtractive stamping. Stamping was performed with the chronoamperometry operation mode of the Potentiostat for chosen potentials. Stampings were also run with a fixed potential of 0.3 V but different lengths of time for stamping rate analysis. Shown in figure 2 are the SEM images of the silver sulfide stamp and the produced silver feature. The lateral resolution achieved is 120nm for line width. Shown in figure 3 are the stamping depths measured at different time steps of a stamping process and the calculated stamping rates at different time steps. The silver removal rate throughout the stamping process is found to remain the same. The constant stamping rate suggests constant ionic conduction which means constant ionic conductivity-the ionic conductivity of silver sulfide remains constant irrespective of silver concentration change, or the composition of the silver sulfide stamp. This is in good agreement with Hebb and Wagner12,13 in their electrochemical measurements of silver sulfide which states that ionic conductivity of silver sulfide is almost independent of composition, given the structure of β-form silver sulfide is quite open and the considerable freedom in the disposition of silver ions. The rough surface of the generated features seen in figure 2 is thought to be due to the small depth of the pattern on the silver sulfide stamp which causes undesirable etch of silver and pulling of silver grains; the characterization and optimization of it is currently being investigated. To conclude, we have demonstrated a unique technique to pattern metal with sub-micron resolution in a high-throughput stamping process. The process is a solid-state, room temperature process that is highly compatible with a large variety of process technologies. In our initial attempt, a lateral resolution of 120nm is achieved.
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Zhang, H. S., J. L. Endrino und A. Anders. „Modification of Surface and Tribological Properties of DLC Films by Adding Silver Content“. In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71070.

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The incorporation of silver into the diamond-like carbon (DLC) coatings has shown excellent potential in various applications; therefore the surface and tribological properties of silver-containing DLC thin films deserve to be investigated. In this study we have deposited silver-containing hydrogenated and hydrogen-free DLC coatings by plasma immersion ion implantation and deposition (PIII-D) methods. Atomic force microscopy (AFM) and nano-scratch tests were used to study the surface and tribological properties. The silver incorporation had only slight effects on hydrogenated DLC coatings. However, the incorporation of silver has significant effect on hydrogen-free DLC of smoothing the surface and increasing the surface energy. Those effects have been illustrated and explained in the context of experimental results.
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Madhuwanthi, W. A. D. P., D. N. S. Dammage, Sampath C. Weragoda und K. G. Alahapperuma. „Effect of Nano-Silver Ions Pumps on Antimicrobial Activity of Ag-Nps Incorporated Polymer-Based Food Packings“. In 2022 Moratuwa Engineering Research Conference (MERCon). IEEE, 2022. http://dx.doi.org/10.1109/mercon55799.2022.9906268.

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Najafi, S. I., und R. V. Ramaswamy. „Diffusion and modal characterization of Ag+–Na+ exchanged channel waveguides“. In Integrated and Guided Wave Optics. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/igwo.1986.fdd2.

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Ion-exchanged glass waveguides are expected to form the basis for the potentially inexpensive passive integrated optical components compatible with single-mode optical fibers. Recently, an improved electrolytic release technique,1 where silver ions were introduced into a bath of molten NaNO3 containing the glass substrate with the Ag+ concentration controlled to better than ± 1 μg, was used to fabricate low-loss (≈0.1-dB/cm) optical waveguides by using Ag+–Na+ exchange at elevated temperatures.
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Jalilian, Romaneh, David Mudd, Neil Torrez, Jose Rivera, Mehdi M. Yazdanpanah und Brian Miller. „Metallic Nanoneedles Arrays for TEM Sample Preparation “Lift-Out”“. In ISTFA 2012. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.istfa2012p0379.

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Abstract The sample preparation for transmission electron microscope can be done using a method known as "lift-out". This paper demonstrates a method of using a silver-gallium nanoneedle array for a quicker sharpening process of tungsten probes with better sample viewing, covering the fabrication steps and performance of needle-tipped probes for lift-out process. First, an array of high aspect ratio silver-gallium nanoneedles was fabricated and coated to improve their conductivity and strength. Then, the nanoneedles were welded to a regular tungsten probe in the focused ion beam system at the desired angle, and used as a sharp probe for lift-out. The paper demonstrates the superior mechanical properties of crystalline silver-gallium metallic nanoneedles. Finally, a weldless lift-out process is described whereby a nano-fork gripper was fabricated by attaching two nanoneedles to a tungsten probe.
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Barna, Shama F., Kyle E. Jacobs, Glennys A. Mensing und Placid M. Ferreira. „Direct Writing on Phosphate Glass Using Atomic Force Microscopy for Rapid Fabrication of Nanostructures“. In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67471.

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Rapid and cost effective fabrication of nanostructures is critical for experimental exploration and translation of results for commercial development. While conventional techniques such as E-beam or Focused Ion beam lithography serve some prototyping needs for nano-scale experimentations, cost and rate considerations prohibit use for manufacturing. Specialized lithographic processes [e.g. nanosphere lithography or interference lithography] are also powerful tools in creating nanostructures but provide limited shapes, positioning and size control of nanostructures. In this work, we demonstrated a liquid-free and mask-less electrochemical writing approach using atomic force microscopy (AFM) that is capable of making arbitrary shapes of silver nanostructures in seconds on a solid state super-ionic (AgI)x (AgPO3)(1−x) glass. Under ambient conditions. silver is extracted selectively on super-ionic (AgI)x (AgPO3)(1−x) glass surface by negatively biasing an AFM probe relative to an Ag film counter electrode. Both voltage controlled and current controlled writings demonstrated localized extraction of silver. The current controlled approach is shown to be the preferred writing approach to make repeatable and uniform patterns of silver on (AgI)x AgPO3(1−x), where x represents the mole fraction of AgI in the mixture and the control parameter that tunes the conductivity of the sample. We demonstrated current controlled printing of silver on two different compositions of the material (i.e. (AgI)0.125 (AgPO3 )0.875 and (AgI)0.25(AgPO3)0.75 ). Depending on the magnitude of the constant current and tip speed, line-width of the silver pattern can be ∼150 nm. The length of these patterns are limited to the maximum distance the tip can be moved using the AFM position controls. The substrate being optically transparent allows the use of this writing technique for rapid prototyping plasmonic devices. By using the patterned substrate as a template for replica molding of soft materials such as polydimethylsiloxane (PDMS), this writing technique can also be utilized for high throughput nano-channel fabrication in biofluidics and microfluidics devices.
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Lee, Hyun-Taek, Chung-Soo Kim, Hae-Sung Yoon, Ki-Hwan Jang, Jung-Oh Choi und Sung-hoon Ahn. „In-Situ Characterization of Nano-Structures Fabricated by Focused Ion Beam (FIB) and Nano Particle Deposition System (NPDS)“. In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34258.

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Nano particle deposition system (NPDS) had been developed for the creation of micro/nano structures with multimaterials in order to develop the micro/nano devices on the basis of specific localized surface on the multilayer. However, micro structures fabricated by NPDS show different mechanical properties when it compared to bulk material because of its porous and uneven deposition structure. To achieve reasonable mechanical properties of the structure fabricated by nanoscale 3D printing system, it requires in-situ mechanical property test method. Herein, a new approach for in-situ nanomechanical characterization system using microforce sensor and nanomanipulator installed in focused ion beam system. In this research, experimental setup for mechanical characterization was developed and mechanical property test was done in Focused Ion Beam (FIB) system. The specimen was fabricated by FIB milling process, then manipulation and compression processes are operated by this characterization system with real time imaging. The test was done for silver microstructures fabricated by NPDS and results show weaker hardness and smaller young’s modulus than bulk material.
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Aziz, shujahadeen, Wrya Karim und Hewa Ghareeb. „From Nano Scale Silver Particles to Metallic Bulk Sizes: Increase of Silver Ion Reduction Rate in Chitosan:AgNO3 Polymer electrolyte Mediated by Titanium Dioxide Filler“. In 1st International Online Conference on Nanomaterials. Basel, Switzerland: MDPI, 2018. http://dx.doi.org/10.3390/iocn_2018-1-05498.

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Berichte der Organisationen zum Thema "Nano Silver and Silver Ions"

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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova und Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, Januar 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
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Kolesnikova, Tatiana, und Igor Uflyand. Application of silver metal-polymer nanocomposites in the analysis of iodide ions. Peeref, Juli 2023. http://dx.doi.org/10.54985/peeref.2307p2528244.

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Parida, Umesh Kumar. Eco-friendly Silver Nano-Biosensor for Identifying the Efficacy of Pathogen and Toxin in Glycine max Crop. Newredmars Education (P) Ltd, Mai 2017. http://dx.doi.org/10.28921/nrme.mrp.1.2017.26.

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Lever, A. B., Penny Seymour und Pamela Auburn. Exciplex Formation between Silver Ions and the Lowest MLCT Excited State of the Tris(Bipyrazine)Ruthenium(2) Cation. Fort Belvoir, VA: Defense Technical Information Center, Juli 1988. http://dx.doi.org/10.21236/ada197360.

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Bendikov, Michael, und Thomas C. Harmon. Development of Agricultural Sensors Based on Conductive Polymers. United States Department of Agriculture, August 2006. http://dx.doi.org/10.32747/2006.7591738.bard.

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In this 1-year feasibility study, we tried polymerization of several different monomers, commercial as well as novel, specially designed and synthesized for this project in the presence of the nitrate ion to produce imprinted conductive polymers. Polymers 1 and 2 (shown below) produced a response to nitrate, but one inferior to that produced by a polypyrrole (Ppy)-based sensor (which we demonstrated prior to this study). Thus, we elected to proceed with improving the stability of the Ppy-based sensor. In order to improve stability of the Ppy-based sensor, we created a two-layer design which includes nitrate-doped Ppy as an inner layer, and nitrate-doped PEDOT as the outer layer. PEDOT is known for its high environmental stability and conductivity. This design has demonstrated promise, but is still undergoing optimization and stability testing. Previously we had failed to create nitrate-doped PEDOT in the absence of a Ppy layer. Nitrate-doped PEDOT should be very promising for sensor applications due to its high stability and exceptional sensing properties as we showed previously for sensing of perchlorate ions (by perchlorate-doped PEDOT). During this year, we have succeeded in preparing nitrate-doped PEDOT (4 below) by designing a new starting monomer (compound 3 below) for polymerization. We are currently testing this design for nitrate sensing. In parallel with the fabrication design studies, we fabricated and tested nitrate-doped Ppy sensors in a series of flow studies under laboratory and field conditions. Nitrate-doped Ppy sensors are less stable than is desirable but provide excellent nitrate sensing characteristics for the short-term experiments focusing on packaging and deployment strategies. The fabricated sensors were successfully interfaced with a commercial battery-powered self-logging (Onset Computer Hobo Datalogger) and a wireless data acquisition and transmission system (Crossbow Technologies MDA300 sensor interface and Mica2 wireless mote). In a series of flow-through experiments with water, the nitrate-doped Ppy sensors were exposed to pulses of dissolved nitrate and compared favorably with an expensive commercial sensor. In 24-hour field tests in both Merced and in Palmdale, CA agricultural soils, the sensors responded to introduced nitrate pulses, but with different dynamics relative to the larger commercial sensors. These experiments are on-going but suggest a form factor (size, shape) effect of the sensor when deployed in a porous medium such as soil. To fill the need for a miniature reference electrode, we identified and tested one commercial version (Cypress Systems, ESA Mini-reference electrode) which works well but is expensive ($190). To create an inexpensive miniature reference electrode, we are exploring the use of AgCl-coated silver wire. This electrode is not a “true” reference electrode; however, it can calibrated once versus a commercial reference electrode at the time of deployment in soil. Thus, only one commercial reference electrode would suffice to support a multiple sensor deployment.
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Low-Cost Nano-Patterning Process Makes Millions of Holes in Silver Film, Boosting Light-Capturing Qualities of Solar Cells (Fact Sheet). Office of Scientific and Technical Information (OSTI), Februar 2011. http://dx.doi.org/10.2172/1009295.

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