Thematische Bibliographien / Nanosilver formation

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Auswahl der wissenschaftlichen Literatur zum Thema „Nanosilver formation“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Nanosilver formation"

Cuong, Do Manh, Le Thanh Long, Hoang Thanh Tung, Vu Quoc Luan, Vu Thi Hien, Nguyen Thi Nhat Linh, Truong Thi Bich Phuong und Duong Tan Nhut. „The role of nanosilver in improving frequency of single cell formation of Limonium sinuatum (L.) Mill“. Vietnam Journal of Biotechnology 16, Nr. 3 (18.12.2018): 481–90. http://dx.doi.org/10.15625/1811-4989/16/3/11724.

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In this research, nanosilver with different concentrations and treatment time was used to sterilize infection agents and induce initial explants which were used as materials for cell suspension culture of Limonium sinuatum. The result showed that leaf explants sterilized with 0.2 g/L nanosilver for 20 minutes had highest effect (live rate 73.33%) comparing to HgCl2and Ca(ClO)2(56.66% and 64.44%, respectively). In addition, the leaf explants which were treated with nanosilver and cultured in ½ MS medium supplemented with 20 g/L sucrose, 1 mg/L picloram and 2.5 g/L gelrite also induced calli (friable calli, milk white color, embryogenic callus structure). Moreover, cell suspension formation process from these calli was also observed highest on the 20thday (49,088 cells/mL) in liquid shaking culture condition comparing to control treatment (19,361 cells/mL) when they were cultured on similar medium combined with 1.2 mg/Lnanosilver. These cells had the best growth, development and regeneration from the 16thday to the 20thday. The ability of shoot and callus regeneration was highest (67.77%) in ½ MS medium which was supplemented with 20 g/L sucrose, 1 mg/L zeatin, 2.5 g/L gelrite and 1.6 mg/L nanosilver compared with control treatment having no nanosilver (40.00%). This research showed that in micropropagation of Limonium sinuatum, nanosilver was proved to be an effective agent for sterilization, explant induction, cell suspension origination, and callus and shoot regeneration. Beside that, nanosilver had negative impact on the development of explants when it was used with high concentration for extended period.

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Lestari, Nanda Revita Dwi, und Sari Edi Cahyaningrum. „Synthesis and Characterization of Hydroxyapatite-Nanosilver as Anti Bacteria that Cause Dental Caries“. Indonesian Journal of Chemical Science 11, Nr. 1 (01.05.2022): 33–40. http://dx.doi.org/10.15294/ijcs.v11i1.51070.

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The formation of dental caries is the result of the activity of Streptococcus mutans bacteria. Various attempts have been done to prevent dental caries. One of them is using oral preparations containing antibacterial compounds Hydroxyapatite-NanoSilver which is an active ingredient that can provide antimicrobial effects to prevent dental caries. This study aims to synthesize and characterize nanosilver hydroxyapatite as an antibacterial that causes dental caries. Physicochemical characterization and antibacterial test towards Streptococcus mutans bacteria with the active ingredient hydroxyapatite-nanosilver. In this study, hydroxyapatite-nanosilver materials with variations in nanosilver concentration of 4 ppm were used; 7 ppm; 10 ppm; 13 ppm; and 15 ppm. The results of FT-IR characterization showed the functional groups O-H, C=O, CO32-, and PO43-. The results of the PSA test showed that the hydroxyapatite-nanosilver formulation with a concentration of 10 ppm had the smallest nanoparticle size of 80.89 nm. Measurement of antibacterial activity test showed that the hydroxyapatite-nanosilver formulation was able to inhibit the growth of Streptococcus mutans bacteria. The highest diameter of resistance to the growth of mutant Streptococcus bacteria in hydroxyapatite-nanosilver formulations is 22.5 mm at a nanosilver concentration of 4 ppm.

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Liang, Xiao Jing, Gui Qing Wen und Zhi Liang Jiang. „Spectrophotometric Determination of Trace Hg²⁺ with hsDNA-Modified Nanosilver Probe“. Applied Mechanics and Materials 319 (Mai 2013): 513–16. http://dx.doi.org/10.4028/www.scientific.net/amm.319.513.

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Herring sperm DNA (hsDNA) was used to modify 5 nm nanosilver to obtain a hsDNA-nanosilver probe (Ag-hsDNA) for Hg2+. In the presence of Hg2+, it combined with hsDNA to produce Hg2+-hsDNA complexes and to release nanosilver particles, based on formation of stable T-Hg2+-T mismatches. Nanosilver particles aggregated to form larger nanosilver clusters and led the absorption at 412 nm decreased in the pH 6.5 Na2HPO4-NaH2PO4buffer solution and 0.05 mol/L NaCl medium. The decreased absorption (ΔA412nm) is linear to Hg2+concentration in the range of 1.36-10.86μg/L Hg2+, with regress equation of ΔA=0.0987CHg2++0.0624, correlation coefficient of 0.9890, and detection limit of 0.30μg/L Hg2+. The assay was applied to the analysis of Hg2+in wastewater with satisfactory results.

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Khachatryan, Karen, Lusine Khachatryan, Marcel Krzan, Magdalena Krystyjan, Lidia Krzemińska-Fiedorowicz, Anna Lenart-Boroń, Aneta Koronowicz, Mariola Drozdowska und Gohar Khachatryan. „Formation and Investigation of Physicochemical, Biological and Bacteriostatic Properties of Nanocomposite Foils Containing Silver Nanoparticles and Graphene Oxide in Hyaluronic Acid Matrix“. Materials 14, Nr. 12 (18.06.2021): 3377. http://dx.doi.org/10.3390/ma14123377.

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Natural polysaccharides, including hyaluronic acid, find a wide range of applications in biomedical sciences. There is a growing interest in nanocomposites containing hyaluronic acid and nanoparticles such as nanometals or graphene. In this study, we prepared foils of pure sodium hyaluronate and sodium hyaluronate containing nanosilver, graphene oxide, nanosilver/graphene oxide and characterized their properties. UV-vis spectroscopy and scanning electron microscopy (SEM) confirmed the formation of 10–20 nm silver nanoparticles. The structural changes were investigated using Fourier transforms infrared (FTIR) spectra and size exclusion chromatography. The obtained results suggest changes in molecular weights in the samples containing nanoparticles, which was highest in a sample containing nanosilver/graphene oxide. We also assessed the mechanical properties of the foils (thickness, tensile strength and elongation at break) and their wettability. The foils containing nanosilver and nanosilver/graphene oxide presented bacteriostatic activity against E. coli, Staphylococcus spp. and Bacillus spp., which was not observed in the control and sample containing graphene oxide. The composites containing graphene oxide and nanosilver/graphene oxide exhibited a cytotoxic effect on human melanoma WM266-4 cell lines (ATCC, Manassas, VA, USA).

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Zaki, Sahar, Marwa Etarahony, Marwa Elkady und Desouky Abd-El-Haleem. „The Use of Bioflocculant and Bioflocculant-ProducingBacillus mojavensisStrain 32A to Synthesize Silver Nanoparticles“. Journal of Nanomaterials 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/431089.

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It is preferable to use an organism to produce more than one product at the same time. So, the aim of this study was to investigate the ability of bioflocculant-producingBacillus mojavensisstrain 32A as a nanosilver synthesizer beside bioflocculant production. To achieve this target, three media, nutrient broth, bioflocculant-producing medium, and pure bioflocculant, were tested. Produced nanosilver was characterized by UV-vis, XRD, and TEM. In all cases, the results demonstrated that UV-vis showed a peak at ~420 nm corresponding to the plasmon absorbance of nanosilver. XRD spectrum exhibited 2θvalues corresponding to the silver nanocrystal that is produced in hexagonal and cubic crystal configurations. TEM confirmed formation, size, shape, and morphologies of nanosilver particles. The results emphasized that purified bioflocculant has the ability to produce anisotropy clusters of nanosilver ranging in size from 6 to 72 nm proving that the bioflocculant functioned as reducing and stabilizing agent in nanosilver synthesis.

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Swolana, Denis, Małgorzata Kępa, Celina Kruszniewska-Rajs und Robert D. Wojtyczka. „Antibiofilm Effect of Silver Nanoparticles in Changing the Biofilm-Related Gene Expression of Staphylococcus epidermidis“. International Journal of Molecular Sciences 23, Nr. 16 (17.08.2022): 9257. http://dx.doi.org/10.3390/ijms23169257.

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Nowadays, antibiotic resistance is a major public health problem. Among staphylococci, infections caused by Staphylococcus epidermidis (S. epidermidis) are frequent and difficult to eradicate. This is due to its ability to form biofilm. Among the antibiotic substances, nanosilver is of particular interest. Based on this information, we decided to investigate the effect of nanosilver on the viability, biofilm formation and gene expression of the icaADBC operon and the icaR gene for biofilm and non-biofilm S. epidermidis strains. As we observed, the viability of all the tested strains decreased with the use of nanosilver at a concentration of 5 µg/mL. The ability to form biofilm also decreased with the use of nanosilver at a concentration of 3 µg/mL. Genetic expression of the icaADBC operon and the icaR gene varied depending on the ability of the strain to form biofilm. Low concentrations of nanosilver may cause increased biofilm production, however no such effect was observed with high concentrations. This confirms that the use of nanoparticles at an appropriately high dose in any future therapy is of utmost importance. Data from our publication confirm the antibacterial and antibiotic properties of nanosilver. This effect was observed phenotypically and also by levels of gene expression.

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Putro, David Sarono, Dian E. Ermawati und Adi Yugatama. „Volume Variation of Sweet Orange (Citrus sinensis) Juice and Peel Extract Toward the Characteristic and Antibacterial Activity of Nanosilver“. Indonesian Journal of Pharmaceutical Science and Technology 9, Nr. 1 (02.02.2022): 31. http://dx.doi.org/10.24198/ijpst.v1i1.29870.

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Biosynthesis of nanosilver by using sweet orange (C. sinensis) as a bioreductor has shown nanosized results. In this research, the effect of volume variation of sweet orange juice and peel extract combination toward the characteristics and antibacterial activity of synthesized nanosilver will be studied. Solution of AgNO3 1 mM was mixed with a combination of sweet orange juice – peel extract with ratios (v/v), 3:0; 1.5:1.5; 1:2; 0.5:2.5 and 0:3 at 60˚C for 45 minutes. The color change of the mixed solution indicated the formation of nanosilver and confirmed by using UV/Vis spectrophotometer and TEM analysis. The results show that the addition of sweet orange juice in combination accelerated the color change of the mixed solution. The characterization of nanosilver with UV/Vis spectrophotometer confirmed SPR peak at 438-459 nm. The stability test showed that nanosilver reduced with sweet orange juice-peel extract 0,5:2,5 (v/v) was stable and had inhibition diameter tested by the diffusion method against S.aureus (19.50 mm) and S.epidermidis (18.09 mm), indicates a moderate inhibition. Its TEM analysis confirmed the particle's size of about 30-56 nm with spherical form.Keywords: nanosilver, biosynthesis, Citrus sinensis, characteristic, antibacterial activity

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Huma, Zil‐e, Ibrahim Javed, Zhenzhen Zhang, Hajira Bilal, Yunxiang Sun, Syed Zajif Hussain, Thomas P. Davis et al. „Nanosilver Mitigates Biofilm Formation via FapC Amyloidosis Inhibition“. Small 16, Nr. 21 (27.01.2020): 1906674. http://dx.doi.org/10.1002/smll.201906674.

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He, Maowei, Liling Sun, Kunyuan Hu, Yunlong Zhu, Lianbo Ma und Hanning Chen. „Drop-on-Demand Inkjet Printhead Performance Enhancement by Dynamic Lumped Element Modeling for Printable Electronics Fabrication“. Mathematical Problems in Engineering 2014 (2014): 1–16. http://dx.doi.org/10.1155/2014/270679.

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The major challenge in printable electronics fabrication is the print resolution and accuracy. In this paper, the dynamic lumped element model (DLEM) is proposed to directly simulate an inkjet-printed nanosilver droplet formation process and used for predictively controlling jetting characteristics. The static lumped element model (LEM) previously developed by the authors is extended to dynamic model with time-varying equivalent circuits to characterize nonlinear behaviors of piezoelectric printhead. The model is then used to investigate how performance of the piezoelectric ceramic actuator influences jetting characteristics of nanosilver ink. Finally, the proposed DLEM is applied to predict the printing quality using nanosilver ink. Experimental results show that, compared to other analytic models, the proposed DLEM has a simpler structure with the sufficient simulation and prediction accuracy.

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Yang, Hui, und Jihui Wu. „Improvement of Sintering Performance of Nanosilver Paste by Tin Doping“. Journal of Nanomaterials 2020 (22.01.2020): 1–6. http://dx.doi.org/10.1155/2020/3925276.

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Nanosilver paste, an interconnect solder, is a common choice in the electronics packaging industry. However, higher sintering temperature and lower sintering strength limit its application. At present, doped nanosilver paste has been studied for use in chip interconnection. In order to improve the sintering properties and shear strength of nanosilver paste, we have developed a new tin-doped nanosilver paste (referred to as silver tin paste), and according to the decomposition temperature of the organic dispersant in the slurry, a corresponding sintering process with a maximum temperature of 300°C was developed. The product after sintering of the silver tin paste is a mixture of a solid solution of Ag and an Ag3Sn phase. Among them, the hard and brittle phase Ag3Sn diffuse distribution in the silver matrix for strengthening, and the solid solution of Ag acts as a replacement solid solution strengthening. As the content of doped Sn increases, the sintering strength increases remarkably. When the Sn content is 5%, the joint shear strength reaches the highest value of 50 MPa. When it exceeds 5%, the sintering strength gradually decreases, which may be caused by the excessive formation of the intermetallic compound IMC as the dopant content increases. This new tin-doped nanosilver technology has the characteristics of low-temperature sintering and high-temperature service, so it is expected to be widely used in semiconductor power devices.

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Dissertationen zum Thema "Nanosilver formation"

Xiao, Kewei. „A diffusion-viscous analysis and experimental verification of the drying behavior in nanosilver-enabled low-temperature joining technique“. Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/25137.

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The low-temperature joining technique (LTJT) by silver sintering is being implemented by major manufacturers of power electronics devices and modules for bonding power semiconductor chips. A common die-attach material used with LTJT is a silver paste consisting of silver powder (micron- or nano-size particles) mixed in organic solvent and binder formulation. It is believed that the drying of the paste during the bonding process plays a critical role in determining the quality of the sintered bond-line. In this study, a model based on the diffusion of solvent molecules and viscous mechanics of the paste was introduced to determine the stress and strain states of the silver bond-line. A numerical simulation algorithm of the model was developed and coded in the C++ programming language. The numerical simulation allows determination of the time-dependent physical properties of the silver bond-line as the paste is being dried with a heating profile. The properties studied were solvent concentration, weight loss, shrinkage, stress, and strain. The stress is the cause of cracks in the bond-line and bond-line delamination. The simulated results were verified by complementary experiments in which the formation of cracks in bond-line and interface delamination was observed during the pressure-free drying of a die-attach nanosilver paste. Furthermore, the important drying parameters, such as drying pressure, low temperature drying time and temperature ramp rate of nanosilver LTJT process, are experimentally studied and analyzed with the numerical simulation. The simulated results were consistent with the experimental findings that the quality of sintered silver bond-line increases with increasing external drying pressure, with increasing low temperature drying time, and with decreasing temperature ramp rate. The insight offered by this modeling study can be used to optimize the process profile that enable pressure-free, low-temperature sintering of the die-attach material to significantly lower the cost of implementing the LTJT in manufacturing.
Ph. D.

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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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Buchteile zum Thema "Nanosilver formation"

V. Morozova, Olga, und Dmitry V. Klinov. „Nanosilver in Biomedicine: Advantages and Restrictions“. In Silver Micro-Nanoparticles - Properties, Synthesis, Characterization, and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96331.

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Nanosilver (in a range 1–100 nm) binds with thyol-, amino- and carboxy-groups of aminoacid residues of proteins and nucleic acids, thus providing inactivation of pathogenic multidrug-resistant microorganisms. Besides antibacterial, antiviral, antifungal and anti-cancer properties Ag-based nanomaterials possess anti-inflammatory, anti-angiogenesis and antiplatelet features. Drug efficacy depends on their stability, toxicity and host immune response. Citrate coated Ag nanoparticles (NPs) remain stable colloid solutions in deionized water but not in the presence of ions due to replacement of Ag+ by electrolyte ions, potential formation of insoluble AgCl, subsequent catalyzed oxidative corrosion of Ag and further dissolution of surface layer of Ag2O. Protein shells protect core of AgNPs from oxidation, dissolution, aggregation and provide specific interactions with ligands. These nanoconjugates can be used for immunoassays and diagnostics but the sensitivity threshold does not exceed 10 pg Cytotoxicity of AgNPs conjugated with proteins is associated with the rate of intracellular Ag+ release, a ‘Trojan horse’ effect, and exceeds one of Ag+ because of endocytosis uptake of NPs but not ions. Relatively toxic nanosilver causes immunosuppression of the majority of cytokines with a few exceptions (IL-1β, G-CSF, MCP-1) whereas AgNO3 additionally activate TNFα and IL8 gene expression.

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