Zeitschriftenartikel: „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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Zhai, Feng Rui, Yi Ming Liu, Zhong Zhou Yi, Hong Wei Zhang und Min Lu. „Effects of Different Reducing Agents and Protective Agents on the Preparation of Nano-Silver Powder“. Key Engineering Materials 512-515 (Juni 2012): 136–40. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.136.

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Solution chemical reduction method is a means which used reducing agent in aqueous or organic systems to deoxidize silver ions. Its essence is an integrated process of the electrochemistry, thermodynamics, kinetics and fluid dynamics and so on. The process determines the physical and chemical properties such as the size distribution of powder, purity and reunion situations, etc. Nano-silver powder has high surface activity and catalytic properties, and is widely used to a lot of fields. So it has very important realistic significance to study the preparation method. In this paper, nano-silver powder was prepared with industrial AgNO3 as raw materials, sodium borohydride or hydrazine hydrate as reducing agent, polyvinyl alcohol, SDBS or polyvinylpyrrolidone(PVP) as the surface protective agent by solution chemical reduction method. The influences of different reducing agents and protective agents on the preparation of nano-silver were analyzed. The results from the XRD diffraction analysis and TEM show that it can be obtained high purity flake nano-silver in the reaction temperature range of 50-60°C.

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El yacoubi, Ahmed, Brahim Chafik El idrissi, Amine Rkhaila und Brahim Sallek. „Antibacterial and photocatalytic performance of Silver orthophosphate/Hydroxyapatite composite“. Mediterranean Journal of Chemistry 8, Nr. 4 (17.06.2019): 320–27. http://dx.doi.org/10.13171/mjc841906173ae.

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The present work reports the synthesis of pure hydroxyapatite and HAp supported Ag3PO4 (Ag3PO4/HAp composites) with varying amounts of silver ions Ag+ with a facile in-situ ion exchange method. XRD results of Ag3PO4/HAp composite reveal the peaks characteristic of pure HAp with additional peaks of silver ions which suggest the deposit of silver particles on the support surface (HAp). The nano-composites Ag3PO4/HAp samples show good adsorption and improved photocatalytic activities in methylene blue MB degradation (more than 70%). Antibacterial study of Ag3PO4/HAp nano-composites showed that the HAp dried at 90°C possesses some antibacterial activity against Escherichia coli and Staphylococcus aureus bacteria. Also, compared to HAp sample, deposition of Ag3PO4 nanoparticles on HAp surface improves the antibacterial performance of the composites.

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Singh, Divya, und Arun Kumar. „Effects of Nano Silver Oxide and Silver Ions on Growth of Vigna radiata“. Bulletin of Environmental Contamination and Toxicology 95, Nr. 3 (09.07.2015): 379–84. http://dx.doi.org/10.1007/s00128-015-1595-4.

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Shaik, Shakira, Lwamkelekile Mkize, Mthokozisi Khumalo und Nisha Singh. „GREEN SYNTHESIS OF NANO-SILVER PARTICLES FROM LEAF AND STEM EXTRACTS OF IBOZA (TETRADENIA RIPARIA)“. African Journal of Traditional, Complementary and Alternative Medicines 12, Nr. 6 (21.09.2015): 33–38. http://dx.doi.org/10.21010/ajtcam.v12i6.5.

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Background: Secondary metabolites derived from plant extracts can be used in the reduction of metal salts into their respective nanoparticles using simple, environmentally friendly and cost effective green synthesis techniques. Metal nanoparticles have important applications in medicine and agriculture. The leaves of Tetradenia riparia (Iboza), an important medicinal species in South Africa, are reported to contain various terpenoids and pyrones which can be used in the reduction of silver nitrate (AgNO3) to nano-silver particles. Materials and Methods: Fresh leaves and stems of Iboza were oven-dried, crushed, extracted in water and methanol and filtered followed by incubation with AgNO3. Synthesized nano-silver particles were characterised using ultraviolet visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy and Fourier transform infrared (FTIR) spectroscopy. Results: The bio-reduction of metal ion to base metal was rapidly conducted in a single step and at room temperature and pressure. UV-Vis spectra showed the characteristic surface plasmon resonance band of the synthesized nano-silver particles at 410 nm for all extracts. SEM analysis revealed predominantly aggregated spherically-shaped nano-silver particles with a size range of 20-50 nm and an average diameter of 26 nm. The presence of elemental silver in the nanoparticles was confirmed by EDX at 3 keV. As revealed by FTIR analysis, the reducing agents included terpenoids and pyrones which were responsible for reducing and capping the nano-silver particles. Conclusion: Both methanol and aqueous-derived extracts of Iboza leaves and stems can be used to synthesize nano-silver particles. FTIR evidence suggests that the reduction of the silver ions and the synthesis of the nanoparticles may have been actioned by various terpenoid and pyrone compounds found in the plant parts.

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Zhang, Dong. „Removal of Heavy Metal Ions from Water Using Nano-Barium Strontium Titanate Immobilized on the Silica Gel G as an Adsorbent“. Applied Mechanics and Materials 71-78 (Juli 2011): 3500–3503. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3500.

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A new method based on the sorption of the nano-barium strontium titanate immobilized on the silica gel G(GBST) to heavy metal ions, included Mn(Ⅱ), Cu2+, Ni2+,Co2+and Ag+, in waste water. The effects of process parameters such as pH, contact time, regeneration conditions and the effects of common coexisting ions on the ions uptake were investigated. The results showed that the manganese, copper, nickel, cobalt and silver ions studied could be quantitatively retained at a pH value range of 7~9. The adsorption capacities of GBST for manganese, copper, nickel, cobalt and silver ions were found to be 8.2 mg/g, 18.3 mg/g, 4.2 mg/g, 2.2 mg/g and 3.1 mg/g, respectively. The heavy metal ions adsorbed on the sorbent could be eluated completely with diluted HNO3solutions. The GBST can be used as an effective adsorbent for the treatment of wastewaters contaminated with manganese, copper, nickel, cobalt and silver ions.

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Maheswari, P., S. G. Gunasekaran und Stephen L. Devaraj. „Removal of arsenic, nitrate and fluoride by PEES/Nano- Silver Hybrid Membranes“. Research Journal of Chemistry and Environment 25, Nr. 9 (25.08.2021): 107–12. http://dx.doi.org/10.25303/259rjce107112.

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In this present work, we have investigated the arsenic, fluoride and nitrate removal by the poly (ether-ether-sulfone) (PEES)/nano-silver hybrid membranes effectively prepared by the non solvent induced phase separation. The prepared membranes were characterized by thermal and mechanical properties to investigate the influence of nano-silver on the final properties of the membranes. Hence, our experimental study is based on arsenic (III) and arsenic (V) rejection studies attempted at different pH. The results of this study revealed the As (V) removal by NF with a high rejection of 99.98% compared to As (III). Fluoride and nitrate studies were carried out at neutral pH and it showed more than 80% rejection. Based on this investigation, it was concluded that the PEES/nano-silver membranes were effectively applicable to remove hazardous metal ions.

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Zhang, Dong. „Pre-Concentration Capability for Trace Heavy Metal Ions with Manual-Controlled Injection Porous Nano-Barium-Strontium Titanate Microspheres Enricher“. Advanced Materials Research 433-440 (Januar 2012): 689–92. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.689.

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The micro-column packed with porous nano-barium- strontium titanate microspheres, joining with injector, a new manual-controlled injection porous nano-barium- strontium titanate microspheres enricher (PBSTME) was prepared. The enrichment capability of the PBSTME for the heavy metal ions, such as zinc, nickel, copper, manganese, cobalt and silver was investigated. The results showed that all the heavy metals studied could be quantitatively retained by the PBSTME in the pH range of 5–8, and then eluted completely with 2 mol•L-1 HNO3. The detection limits of this method for zinc, nickel, copper, manganese, cobalt and silver ions were 0.028 μg•L-1, 0.2μg•L-1, 0.031 μg•L-1, 0.022 μg•L-1, 0.057μg•L-1 and 0.039 μg•L-1 with an enrichment factor of 50, respectively. A new method has been developed for the determination of trace heavy metal ions based on pre-concentration with a PBSTME prior to their determination by flame atomic absorption spectrometry. The method has been applied to the simultaneous determination of trace amounts of zinc, nickel, copper, manganese, cobalt and silver ions in water sample with satisfactory results.

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Dinesh Babu J. „Bacterial combating potential of biogenic nano silver particles“. International Journal of Novel Trends in Pharmaceutical Sciences 9, Nr. 1 (29.06.2020): 12–15. http://dx.doi.org/10.26452/ijntps.v9i1.1184.

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The nanotechnology had been gaining importance in all the fields like technology, medicine even in robotics. The scientists are focusing on that type of synthesis wherein the advantages overcomes the disadvantages of the production and the plants have been probed as better alternatives in this field. The emerging technology of using plants as precursors or aiding in the production of nanotechnology is viewed as , low toxicity and better in approaching the preparation of . That is why of silver had been in usage considering its antibacterial potency to kill any kind of bacteria. Silver particles had been the best choices for physicians to treat wounds. Hibiscus Rosa plant leaves are found to have abundant so they can be used to reduce the silver ions into . The formed were less toxic as they were synthesized in a natural process. These when tested for antibacterial activity against three species of bacteria, the results were as expected. The produced silver particles showed a significant ZOI compared to the standard drug.

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Li, Gang, Daohai Zhang und Shuhao Qin. „Preparation and Performance of Antibacterial Polyvinyl Alcohol/Polyethylene Glycol/Chitosan Hydrogels Containing Silver Chloride Nanoparticles via One-step Method“. Nanomaterials 9, Nr. 7 (03.07.2019): 972. http://dx.doi.org/10.3390/nano9070972.

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Silver nano-particles (AgNPs)-filled antibacterial materials have been widely employed in the fields of biology and biomedicine. However, AgNPs have shown obvious cytotoxicity. Hence it is more reasonable to use silver chloride nanoparticles (AgCl NPs) to prepare antibacterial materials due to the slow release of silver ions created by AgCl NPs formed in the chitosan. In this experiment, a useful antibacterial hydrogel for skin repairation was prepared by exploring the relationship between AgCl NPs and cytotoxicity. It is worth noting that the crosslinked network structure was successfully obtained in an antibacterial AgCl/PVA (Polyvinyl alcohol)/PEG (Polyethylene glycol)/CS (Chitosan) hydrogel materials by the hydrothermal method. In detail, the dynamic particle size distribution of AgCl NPs was relatively uniform, which is analyzed by a dynamic light scattering (DLS). The internal structure of the lyophilized hydrogel showed obvious porous structure, indicating that the hydrogel had high water content. The result of X-ray photoelectron spectroscopy (XPS) confirmed the existence of a silver element. The release concentration of silver ions was analyzed by inductively coupled plasma (ICP) to study the effect of silver ions release concentration on the antibacterial activity and cytotoxicity of hydrogel. The results show that the lower concentration of silver ions can make the hydrogel have good antibacterial activity and low cytotoxicity. The bacteriostatic rate of the antibacterial hydrogel was over 90%. Simultaneously, the mechanical properties test shows that the hydrogel has good mechanical properties, which can be widely used as an antibacterial material.

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Sengstock, Christina, Jörg Diendorf, Matthias Epple, Thomas A. Schildhauer und Manfred Köller. „Effect of silver nanoparticles on human mesenchymal stem cell differentiation“. Beilstein Journal of Nanotechnology 5 (10.11.2014): 2058–69. http://dx.doi.org/10.3762/bjnano.5.214.

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Background: Silver nanoparticles (Ag-NP) are one of the fastest growing products in nano-medicine due to their enhanced antibacterial activity at the nanoscale level. In biomedicine, hundreds of products have been coated with Ag-NP. For example, various medical devices include silver, such as surgical instruments, bone implants and wound dressings. After the degradation of these materials, or depending on the coating technique, silver in nanoparticle or ion form can be released and may come into close contact with tissues and cells. Despite incorporation of Ag-NP as an antibacterial agent in different products, the toxicological and biological effects of silver in the human body after long-term and low-concentration exposure are not well understood. In the current study, we investigated the effects of both ionic and nanoparticulate silver on the differentiation of human mesenchymal stem cells (hMSCs) into adipogenic, osteogenic and chondrogenic lineages and on the secretion of the respective differentiation markers adiponectin, osteocalcin and aggrecan. Results: As shown through laser scanning microscopy, Ag-NP with a size of 80 nm (hydrodynamic diameter) were taken up into hMSCs as nanoparticulate material. After 24 h of incubation, these Ag-NP were mainly found in the endo-lysosomal cell compartment as agglomerated material. Cytotoxicity was observed for differentiated or undifferentiated hMSCs treated with high silver concentrations (≥20 µg·mL−1 Ag-NP; ≥1.5 µg·mL−1 Ag+ ions) but not with low-concentration treatments (≤10 µg·mL−1 Ag-NP; ≤1.0 µg·mL−1 Ag+ ions). Subtoxic concentrations of Ag-NP and Ag+ ions impaired the adipogenic and osteogenic differentiation of hMSCs in a concentration-dependent manner, whereas chondrogenic differentiation was unaffected after 21 d of incubation. In contrast to aggrecan, the inhibitory effect of adipogenic and osteogenic differentiation was confirmed by a decrease in the secretion of specific biomarkers, including adiponectin (adipocytes) and osteocalcin (osteoblasts). Conclusion: Aside from the well-studied antibacterial effect of silver, little is known about the influence of nano-silver on cell differentiation processes. Our results demonstrate that ionic or nanoparticulate silver attenuates the adipogenic and osteogenic differentiation of hMSCs even at non-toxic concentrations. Therefore, more studies are needed to investigate the effects of silver species on cells at low concentrations during long-term treatment.

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Cicek, Semra, Azize Alaylı Gungor, Ahmet Adiguzel und Hayrunnisa Nadaroglu. „Biochemical Evaluation and Green Synthesis of Nano Silver Using Peroxidase fromEuphorbia(Euphorbia amygdaloides) and Its Antibacterial Activity“. Journal of Chemistry 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/486948.

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Silver nanoparticles are used an increased attention for various biomedical and medical applications. In this study, green synthesis of silver nanoparticles was made with simple method by using peroxidase enzyme partially purified fromEuphorbia(Euphorbia amygdaloides) plant. Optimum pH, temperature and time period were determined to obtain silver nanoparticles using the peroxidase enzyme. The result shows that higher silver nanoparticle was synthesized for 4 hours and at 20°C and pH 8. Also, optimal concentration of metal ions was found as 0.5 mM. The synthesized silver nanoparticles were characterized by UV spectrum, scanning electron microscope (SEM) and X-ray diffraction. Antibacterial activity of silver nanoparticles was measured against some microorganisms such asSerratia marcescens, Yersinia pseudotuberculosis, Klebsiella pneumoniae, Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus pyogenes, Pseudomonas aeruginosa, Salmonella typhimurium, Listeria monocytogenes, and Escherichia coli. Synthesized silver nanoparticles have wide spectrum antibacterial activity in low concentration and may be a good alternative therapeutic approach in medicine and pharmaceutical fields in future.

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Li, Wen Hua, Ji Min Xie, Jun Jie Jing, Hui Ru Qin, Ming Mei Zhang und Yu Jia Xian. „Facile Synthesis of Ni_core - Ag_shell Bimetallic Nano Particles for Conductive Paste“. Advanced Materials Research 661 (Februar 2013): 42–46. http://dx.doi.org/10.4028/www.scientific.net/amr.661.42.

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Ni-Ag core-shell nano particles have been facilely prepared by redox-transmetalation reaction of silver ions on the surface of nickle nano particles. As characterized by transmission electron microscopy (TEM), the as-synthesized core-shell particles were mono-dispersed and exhibited a narrow size distribution ranging from 200nm to 300nm. XRD analyses indicated both Ni core and Ag shell had an fcc structure. Furthermore, the thickness of silver shell was controllable via changing the mole ratio of Ag to Ni, which could show benefits for potential applications in optical, catalytic and electronic fields.

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Notriawan, Doni, Febrika Laila, Eka Angasa, Gustria Ernis, Teja Dwi Sutanto, Reza Pertiwi und Ida Ayu Suci. „BIOSINTESIS DAN KARAKTERISASI PARTIKEL PERAK EKSTRAK TANAMAN DAUN PORANG (Amorphophallus muelleri Blume) SEBAGAI PENDETEKSI ION LOGAM MERKURI“. Indonesian Journal of Pure and Applied Chemistry 6, Nr. 1 (30.04.2023): 1. http://dx.doi.org/10.26418/indonesian.v6i1.63771.

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This study aims to synthesize and characterize silver particles using Porang leaf extract (Amorphophallus muelleri Blume) and determine the selectivity of silver particles as mercury metal ion detectors. The study employed Porang leaf extract as a bioreductor and stabilizer, 0.01M AgNO3 solution as a precursor, and HgCl2 salt solution and PbCl2 salt solution as standard salt solutions to be tested for selectivity. The 2 g of Porang leaves used were cleaned, cut into pieces, allowed to stand at room temperature for three days, and mashed. Porang leaf powder was added with 50 mL of demineralized water and then heated for 15 minutes at a solution temperature of 80°C. The reaction of silver particle formation was carried out by adding Porang leaf extract and AgNO3 0.01M in variations of 1:3, 1:4, 1:5, 1:6, and 1:7, then irradiating under indirect sunlight for 15 minutes. The reaction results of a mixture of colloidal extract and AgNO3 solution showed a change in color to brownish-yellow. The color change indicated the formation of silver particles. The silver particles were then characterized with a UV-Vis spectrophotometer after 15 minutes of heating, 1 hour, and 5 hours at room temperature. The results obtained with colloidal silver particles can be synthesized with a bioreductor of Porang leaf extract (Amorphophallus muelleri Blume) with optimum variations of 1:3 and 1:4. The PSa results obtained in the mixture of silver particles formed were micro-nano-sized silver particles. The results of silver particles tested against metal ions showed that silver particles selectively detect Hg (II) metal ions in HgCl2 solutions compared to Pb (II) metal ions in PbCl2 solutions.

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TENKAYALA, DR SHOBHA RANI, Pagadala R. Sougandhi, Mekala Reddeppa, Sapara Sekhar Harini und R. Gangadhara. „GREEN SYNTHESIS AND CHARACTERIZATION OF SILVER NANO PARTICLES BY USING PSIDIUM GUAJAVA LEAF EXTRACT“. Journal of Drug Delivery and Therapeutics 8, Nr. 5-s (01.10.2018): 301–5. http://dx.doi.org/10.22270/jddt.v8i5-s.2025.

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In this study, rapid, simple approach was applied for synthesis of silver nanoparticles by using Psidium guajava aqueous leaf extract. The plant extract acts as both reducing agent and capping agent. The green synthesized silver nanoparticles were characterized by using physic-chemical techniques viz, UV-Visible spectroscopy, Fourier Transform Infrared Spectrophotometer [FTIR], Particle size analyser and Scanning electron microscopy. UV-Visible spectrophotometer showed absorbance peak in the range of 419nm.The compounds responsible for silver ions and the functional groups present in plant extract were identified and investigated by FTIR technique. The characterization data reveals that the particles were in crystalline in nature with an average size of 62nm. The silver nanoparticles (Ag NPs) were rapidly synthesized using aqueous extract of guava leaf with AgNO3 solution within 15min at room temperature, without the involvement of any hazardous chemicals. Keywords: Nano particles, green synthesis, Silver, Psidium guajava and reducing agents.

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Fehaid, Alaa, Sara T. Elazab, Mona G. Elhadidy, Eman Mohamad El Nashar, Asim Mohammed Abdalla, Khulood Mohammed Al-Khater, Mansour Abdallah Alghamdi und Mahmoud M. Elalfy. „Zinc Chloride Ameliorates the Adverse Effects of Silver Nitrates Compared to Silver Nanoparticle in Post-Natal Model of Toxicity.“ Material Science Research India 19, Nr. 1 (10.05.2022): 17–25. http://dx.doi.org/10.13005/msri/190102.

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Silver nanoparticles have been shown to increase postnatal toxicity in breastfeeding female rats, with negative consequences for their offspring. We wanted to investigate more about the differences in toxicity between silver nitrates and silver nanoparticles, as well as the impact of zinc chloride treatment on the silver nitrates induced toxicity on female albino rats. For 21 days, breastfeeding female albino rats and their puppies were exposed to silver nitrates at dosages of 0, 50, and 100 mg/kg. The results demonstrated that silver nitrates were more hazardous than nano-silver, as evidenced by higher free radical release, increased MDA levels, and decreased antioxidant enzyme levels (SOD). In addition, the silver ions-treated group had higher levels of liver enzymes and creatinine. Zinc chloride treatment, in particular, had a protective impact and mitigated the negative effects of silver nitrates, as seen by the restoration of baseline levels of liver enzyme, creatinine, and antioxidant enzyme. In addition, zinc chloride therapies reduced the harmful effects of silver nitrates on liver and kidney tissues but not lung tissue.

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Faramarzi-Garmroodi, A., M. Danesh Mesgaran, H. Jahani Azizabadi und A. Vakili. „The effect of silver nano-particles (Nanosilver) on in vitro gas production of barley grain and lucerne hay“. Proceedings of the British Society of Animal Science 2009 (April 2009): 188. http://dx.doi.org/10.1017/s1752756200030271.

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It is generally believed that heavy metals react with proteins by combining the thiol (-SH) groups, which leads to the inactivation of the proteins (Cho et al., 2005). Silver nano-particles (Ag-NPs) are being used vastly as a strong anti-germ product. In general, Ag ions, which have antimicrobial activity, are used as an antibacterial agent. The antibacterial activity of Ag ions is inhibits intracellular enzyme activity (Cho et al., 2005). Therefore, the other possibility can be considered that remaining Ag ions in Ag-NPs solution or dissolved Ag ions might affect bacterial growth. Recently, dairy farmers have tended to apply this anti-bacterial for sanitization of the environment (as a disinfectant material) of animals. However, the environmental residual effect of this anti-bacterial on ruminant microbial activity is still questionable. In the present study, a gas production technique was applied in order to determine the effect of silver nano-particles on in vitro gas production of barley grain and lucerne hay.

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Sevim, Altuğ Mert, Ayşe Selda Keskin und Ahmet Gül. „Preparation and characterization of silver nanoparticle-porphyrazine composites“. Journal of Porphyrins and Phthalocyanines 17, Nr. 10 (09.09.2013): 928–33. http://dx.doi.org/10.1142/s1088424613500405.

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A one step chemical reduction process was used for the preparation of hydrophilic silver nanoparticles ( AgNP ) using silver nitrate, sodiumborohydride and polyvinylpyrolidone as stabilizer. In the case of hydrophobic silver nanoparticles reduced silver ions were stabilized with cetyl trimethylammonium bromide (CTAB). The resultant nano particles were characterized by absoption spectra and their interactions with cationic cobalt (QCoPz) and neutral magnesium (MgPz) porphyrazines in water and in organic medium were investigated by using UV-vis spectroscopy and zeta potential techniques. It is confirmed that both metalloporphyrazine molecules interact with silver nanoparticles in an effective manner. The possible arrangement of the porphyrazines on the surfaces of the hydrophilic and hydrophobic AgNPs has been also discussed according to obtained spectroscopic results. These well-characterized novel AgNP -metalloporphyrazine composites are expected to be useful in optical and catalytic applications.

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Ayireddy, Priyanka. „‘GREEN METAL NANO TECHNOLOGY IN DENTISTRY’-A NARRATIVE REVIEW“. INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, Nr. 04 (15.04.2024): 1–5. http://dx.doi.org/10.55041/ijsrem30788.

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Over time, there has been a lot of interest in the synthesis of green AgNPs utilising plant extracts due to the remarkable antibacterial capabilities of these nanoparticles. These particles' nanosized makes it easier for them to pass through cell membranes, interacts with internal organelles, and eventually damages cells when they proliferate. With the exceptional benefits, including practicality, simplicity of usage, and the utilisation of specialised processes like bacteria, plants are currently the preferred method for synthesising metal nanoparticles. Based on the idea of converting silver ions (Ag+) to silver nanoparticles (Ag0), green synthesis techniques for the synthesis of silver nanoparticles are provided. The literature reveals that the modified metal nano particles modifying with green methods are already practicing by dental clinicians, whereas still less percentage of practitioners are using this green nano technology. Hence this narrative review includes different metal nano particles using in dentistry and different green methods using to modify the environmentally friendly dental practices.

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Rahmatpour, Samaneh, Mehran Shirvani, Mohammad R. Mosaddeghi und Mehdi Bazarganipour. „Retention of silver nano-particles and silver ions in calcareous soils: Influence of soil properties“. Journal of Environmental Management 193 (Mai 2017): 136–45. http://dx.doi.org/10.1016/j.jenvman.2017.01.062.

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Cui, Jiaming. „Silver Nanomaterials Applied in the Field of Diagnosis and Treatment“. Theoretical and Natural Science 4, Nr. 1 (28.04.2023): 101–9. http://dx.doi.org/10.54254/2753-8818/4/20220530.

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Nanomaterials have great application prospect in biological medicine due to their strong permeability, repair and regeneration. In particular, nano silver has excellent antibacterial ability and no toxic effect, which makes it widely used. The specific content of this paper introduces a method of using silver nanoparticles to generate silver ions, and then make it react with hydrogen peroxide, through the colorimetric device to react with different color changes corresponding to different concentrations, through this biosensor to determine the concentration of such as cholesterol lactic acid and other substances.And when detecting miRNA,AuNPs were further modified by complementing the DNA (cDNA) of target mirnas. AgNPs could not be attracted to negatively charged DNA due to electrostatic repulsion by immobilized modified gold nanoparticles on the electrode surface. After analyzing the peak of silver stripping, miRNA can be accurately detected.Furthermore, chitosan coated silver nanoparticles were designed, and polyethylene glycol was used as a stabilizer. Finally, its good blood compatibility and antibacterial ability, as well as its cytotoxicity to cervical cancer cells were demonstrated by characterization.Finally, the accumulation and changes of reactive oxygen species (ROS) and reactive nitrogen (RNS) induced by silver nano are introduced, and it is confirmed by measurement that they are important factors in apoptosis of human pancreatic ductal adenocarcinoma.

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Li, Jie, Bing Xie, Kai Xia, Yingchun Li, Jing Han und Chunmao Zhao. „Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light“. Materials 11, Nr. 8 (10.08.2018): 1403. http://dx.doi.org/10.3390/ma11081403.

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Nano titanium dioxide (TiO2) with photocatalytic activity was firstly modified by diethanolamine, and it was then doped with broad spectrum antibacterial silver (Ag) by in situ method. Further, both Ag doped TiO2-chitosan (STC) and TiO2-chitosan (TC) composites were prepared by the inverse emulsion cross-linking reaction. The antibacterial activities of STC composites were studied and their antibacterial mechanisms under visible light were investigated. The results show that in situ doping and inverse emulsion method led to good dispersion of Ag and TiO2 nanoparticles on the cross-linked chitosan microsphere. The STC with regular particle size of 1–10 μm exhibited excellent antibacterial activity against E. coli, P. aeruginosa and S. aureus under visible light. It is believed that STC with particle size of 1–10 μm has large specific surface area to contact with bacterial cell wall. The increased antibacterial activity was attributed to the enhancement of both electron-hole separations at the surface of nano-TiO2 by the silver ions under the visible light, and the synergetic and sustained release of strong oxidizing hydroxyl radicals of nano-TiO2, together with silver ions against bacteria. Thus, STC composites have great potential applications as antibacterial agents in the water treatment field.

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Bhatt, Keyur, Anita Kongor, Mohd Atharb und Vinod Jain. „New views on the ingenious applications of Ag nanoparticles as a sensor for antibiotic detection and as a potent antimicrobial agent“. Journal of Metals, Materials and Minerals 31, Nr. 3 (28.09.2021): 1–9. http://dx.doi.org/10.55713/jmmm.v31i3.1121.

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Nanotechnology uses exceptional approaches for the control of bacterial infections which uncovers the potential function of bio-systems at nano-scale level. Compared to silver ions, silver nanoparticles possess enhanced physicochemical stability and low bio-toxicity properties. The intrinsic chemical framework of silver nanoparticles is prone to exhibit a significant chemistry when used as sensor and as therapeutic. Nowadays, silver is used in (nano-) medicine, in the form of nanoparticles to optimize its therapeutic property for controlling infections caused by multidrug-resistant bacteria. Exclusive use of antibiotics as medicines and its discharge from the body of the infected person or animals into the sewage system has led to antimicrobial resistance. Rising resistance of antibiotics is another serious threat that may lead to pandemics. Thus, there is an urgent need to develop selective and sensitive sensors for probing antibiotics, especially to prevent human health hazards. The present review emphasizes on the recent advances of silver nanoparticles concerning two inter-related subjects, first, application as a therapeutic agent to control infections and secondly, as sensors to detect antibiotics. Moreover, the chemistry of silver nanoparticles behind its applications as sensor and bactericidal agent is described. Major challenges have been elaborated for the emergence of silver nanoparticles in the field of antibiotic detection and its use for controlling bacterial infections.

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Baccaro, M., A. K. Undas, J. de Vriendt, J. H. J. van den Berg, R. J. B. Peters und N. W. van den Brink. „Ageing, dissolution and biogenic formation of nanoparticles: how do these factors affect the uptake kinetics of silver nanoparticles in earthworms?“ Environmental Science: Nano 5, Nr. 5 (2018): 1107–16. http://dx.doi.org/10.1039/c7en01212h.

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Wiglusz, R. J., Z. Drulis-Kawa, R. Pazik, K. Zawisza, A. Dorotkiewicz-Jach, J. Roszkowiak und J. M. Nedelec. „Multifunctional lanthanide and silver ion co-doped nano-chlorapatites with combined spectroscopic and antimicrobial properties“. Dalton Transactions 44, Nr. 15 (2015): 6918–25. http://dx.doi.org/10.1039/c5dt00046g.

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Multifunctional nanocrystalline chlorapatites doped with lanthanide ions (Eu³⁺, Er³⁺ and Yb³⁺) and co-doped with silver ions were synthesized by a hydrothermal synthesis route and studied.

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Yudha S, Salprima, Aswin Falahudin, Morina Adfa, Irfan Gustian und Herlina Herlina. „Light-induced synthesis of micron-sized metallic silver in aqueous extract of Rivina humilis L. fruits and its interaction with Corptotermes curvignathus“. Molekul 16, Nr. 2 (20.07.2021): 170. http://dx.doi.org/10.20884/1.jm.2021.16.2.740.

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The aqueous extract of Rivina humilis was suitable to reduce silver ions (Ag+) to form micron-sized metallic silver at room temperature and without any addition of external reducing agent or stabilizer compounds. The reduction process was assisted by light, indicated by the colour change of the reaction mixture and supported by the appearance of peak at 455 nm in spectrophotometric analysis when the reaction was carried out under room light. Based on transmission electron microscopy (TEM) analysis, the as-prepared metallic silver was in spherical form. The analysis results using particles size analyzer (PSA) show their particles distribution from micro to nano size (average size was 199 nm). The interaction behaviour of micron-sized metallic silver/extract solution with Corptotermes curvignathus termites shows that the silver gives small additional effects along with the activity of the extract.

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Kashyap, Mrinal, Kanchan Samadhiya, Atreyee Ghosh, Vishal Anand, Parasharam M. Shirage und Kiran Bala. „Screening of microalgae for biosynthesis and optimization of Ag/AgCl nano hybrids having antibacterial effect“. RSC Advances 9, Nr. 44 (2019): 25583–91. http://dx.doi.org/10.1039/c9ra04451e.

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Ivanova, Nadezhda, Neli Ermenlieva, Lora Simeonova, Iliyan Kolev, Iliya Slavov, Daniela Karashanova und Velichka Andonova. „Chlorhexidine–Silver Nanoparticle Conjugation Leading to Antimicrobial Synergism but Enhanced Cytotoxicity“. Pharmaceutics 15, Nr. 9 (09.09.2023): 2298. http://dx.doi.org/10.3390/pharmaceutics15092298.

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This study explored the potential synergism within chlorhexidine–silver nanoparticle conjugates against Influenza type A, Staphylococcus aureus, Escherichia coli, and Candida albicans. Silver nanoparticles (SN) were obtained by the reduction of silver ions with green tea total phenolic extract and conjugated with chlorhexidine (Cx). The particles were characterized by UV-Vis and FTIR spectroscopies, dynamic light scattering, X-ray diffraction, and transmission electron microscopy. A stable negatively charged nano-silver colloid (ζ = −50.01) was obtained with an average hydrodynamic diameter of 92.34 nm. In the presence of chlorhexidine, the spectral data and the shift of the zeta potential to positive values (ζ = +44.59) revealed the successful sorption of the drug onto the silver surface. The conjugates (SN-Cx) demonstrated potentiation in their effects against S. aureus and C. albicans and synergism against E. coli with minimal inhibitory concentrations of SN at 5.5 µg/mL + Cx 8.8 µg/mL. The SN showed excellent virucidal properties, increasing with time, and demonstrated low toxicity. However, the coupling of the cationic chlorhexidine with nano-silver did not reduce its intrinsic cytotoxicity on various cell lines (MDCK, BJ, and A549). The newly synthesized antimicrobial agent exhibited an extended and promising therapeutic spectrum and needs to be further evaluated regarding the designated route of administration in three-dimensional cell models (e.g., nasal, bronchial, dermal, ocular, etc.).

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Lyutakov, O., I. Goncharova, S. Rimpelova, K. Kolarova, J. Svanda und V. Svorcik. „Silver release and antimicrobial properties of PMMA films doped with silver ions, nano-particles and complexes“. Materials Science and Engineering: C 49 (April 2015): 534–40. http://dx.doi.org/10.1016/j.msec.2015.01.022.

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Huang, Jingxi, Chen Cheng, Youwen Yang, Jun Zan und Cijun Shuai. „Zeolitic Imidazolate Frameworks Serve as an Interface Layer for Designing Bifunctional Bone Scaffolds with Antibacterial and Osteogenic Performance“. Nanomaterials 13, Nr. 21 (25.10.2023): 2828. http://dx.doi.org/10.3390/nano13212828.

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The integration of hydroxyapatite (HA) with broad-spectrum bactericidal nano-silver within biopolymer-based bone scaffolds not only promotes new bone growth, but also effectively prevents bacterial infections. However, there are problems such as a poor interface compatibility and easy agglomeration. In this project, zeolitic imidazolate frameworks (ZIF-8) were grown in situ on nano-HA to construct a core–shell structure, and silver was loaded into the ZIF-8 shell through ion exchange. Finally, the core–shell structure (HA@Ag) was composited with polylactic acid (PLLA) to prepare bone scaffolds. In this case, the metal zinc ions of ZIF-8 could form ionic bonds with the phosphate groups of HA by replacing calcium ions, and the imidazole ligands of ZIF-8 could form hydrogen bonds with the carboxyl groups of the PLLA, thus enhancing the interface compatibility between the biopolymers and ceramics. Additionally, the frame structure of MOFs enabled controlling the release of silver ions to achieve a long-term antibacterial performance. The test results showed that the HA@Ag nanoparticles endowed the scaffold with good antibacterial and osteogenic activity. Significantly, the HA@Ag naoaprticle exhibited a good interfacial compatibility with the PLLA matrix and could be relatively evenly dispersed within the matrix. Moreover, the HA@ZIF-8 also effectively enhanced the mechanical strength and degradation rate of the PLLA scaffold.

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Fares, Hssen, Wissal Stambouli, Habib Elhouichet, Bernard Gelloz und Mokhtar Férid. „Nano-silver enhanced luminescence of Er3+ ions embedded in tellurite glass, vitro-ceramic and ceramic: impact of heat treatment“. RSC Advances 6, Nr. 37 (2016): 31136–45. http://dx.doi.org/10.1039/c6ra02095j.

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Sharma, Preeti, und Vedula Uma. „Schiff Base Anchored with Silver Nanoparticles as Effective Adsorbent for Removal of Cadmium(II) Heavy Metal from Industrial Wastewater“. Asian Journal of Chemistry 32, Nr. 8 (2020): 1941–46. http://dx.doi.org/10.14233/ajchem.2020.22694.

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The current study deals with the examination of the capacity of Schiff base anchored with silver nanoparticles for removal of cadmium(II) ions from industrial wastewater. Schiff base was synthesized using refluxing of salicylaldehyde and 4-aminoantipyrine in alcoholic medium. The characterization of Schiff base were studied by elemental analysis, FTIR, NMR, UV-visible and mass spectral studies. The silver nanoparticles were synthesized using the chemical reduction method and characterized. Then, silver nanoparticles anchored to the Schiff base by suitable method and again characterized. Peanut shells were used as solid phase for removal of Cd(II) ions. The effects of several parameters to optimize the adsorption of Cd(II) ions on solid phase, including pH, contact time, initial metal ion concentration and adsorbent weight were investigated. The maximum removal efficiency of Cd(II) ions on solid phase using Ag nano@Schiff base was achieved under experimental conditions of pH 6 (% removal = 81%), contact time of 15 min (% removal = 93%), initial metal ion concentration of 0.5 ppm (% removal = 95%) and adsorbent weight of 3 mg (% removal = 89%). The results showed that extraction of Cd2+ on AgNPs@Schiff base follows Freundlich adsorption isotherm.

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Asha, Sivaji, und Palaniyandi Thirunavukkarasu. „Rapid green synthesis of silver nano particles from Ziziphus mauritiana and antibacterial activity against human pathogens“. Acta Scientiarum. Biological Sciences 41 (06.11.2019): e45262. http://dx.doi.org/10.4025/actascibiolsci.v41i1.45262.

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A novel green source Ziziphus mauritiana fresh young leaves was opted to synthesize silver nanoparticles and analyze its antibacterial activity. The bioactive compounds present in the plant extracts reduced silver ions to NPs, indicated by change in color from red to dark brown. In this study, we have successfully synthesized nanoparticles using Z. mauritiana aqueous leaf extract as a reducing agent and the reaction process of synthesized nanoparticles was monitored by UV-Vis spectroscopy. The UV-Vis absorption peak showed maximum adsorption at 420 nm confirmed the silver nanoparticles synthesis. Further characterization was carried out by FTIR and the results recorded a downward shift of absorption the bands between 400 to 4000 cm-1 indicates the formation of silver nanoparticles. Finally, the present research was exploited to study the antibacterial activity of synthesized nanoparticles produced Z. mauritiana was studied using different pathogenic bacteria such as Salmonella sp., Proteus sp., Bacillus sp., Klebsiella pneumonia and E.coli from the well diffusion results, the synthesized silver nanoparticles displayed the best antibacterial property as compared to the antibiotic has been reported in this paper. To the best of our knowledge, this is the first report that the Z. mauritiana aqueous extract facilitate the synthesis of silver nanoparticles and also exhibits antibacterial activity.

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Tseng, Kuo-Hsiung, Chih-Ju Chou, To-Cheng Liu, Der-Chi Tien, Chun Yung Chang und Leszek Stobinski. „Relationship between Ag nanoparticles and Ag ions prepared by arc discharge method“. Nanotechnology Reviews 7, Nr. 1 (23.02.2018): 1–9. http://dx.doi.org/10.1515/ntrev-2017-0167.

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AbstractThis study used the submerged arc discharge method (SADM) to produce metal fluid containing nanoparticles and submicron particles, whereby the energy focused by an electric arc was used to disintegrate silver (Ag) metal in deionized water (DW). No additional chemical substances were required throughout the process, which enabled production to be fast and straightforward. This study proposed using colorimetry to define the interrelation between concentration and nano Ag as well as the Ag ions (Ag+) within a nano silver colloid (NSC) of a specific dilution factor, involving ultraviolet-visible (UV-Vis) spectroscopy and the measuring of electrical conductivity. The results showed that Ag+activity increased under various dilution conditions, displaying an upward trend in activity with an increase in the dilution factor. The absorption values of Ag+and nanoparticles increased over time, and the Ag+activity increased by up to a factor of two after its dilution. Therefore, the Ag+and nanoparticles demonstrated an interdependence between each other.

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Rahman, Rizky Abdur, und Suyatno Sutoyo. „Synthesis and Characterization of Silver Nanoparticles from Ethanol Extract of Meniran (Phyllanthus Niruri L.) Using Bioreduction Method“. International Journal of Progressive Sciences and Technologies 34, Nr. 2 (09.10.2022): 32. http://dx.doi.org/10.52155/ijpsat.v34.2.4616.

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The synthesis of silver nanoparticles by the bioreduction method has been successfully carried out using the meniran (P. niruri) as bioreductor. The synthesis was started by varying the volume of AgNO3 in the ethanol extract of meniran 1:1, 1:2, 1:3, and 1:4, so that the optimal volume was 1:1 based on the results of UV-Visible spectrophotometer analysis with an absorbance of 0.306 at maximum wavelength of 409 nm. Based on the measurement using Zetasizer Nano ZS, the resulting silver nanoparticles has paticle size of 740.4 nm. The FTIR analysis showed that there was an increase in the percentage of transmittance of the hydroxyl group which proved the reduction of Ag+ ions to Ag0 and the formation of silver nanoparticles. The Scanning Electron Microscopy proved that the morphology of silver nanoparticles varies in shape and the surface is smooth due to their tendency to agglomerate.

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Baltabayeva, Balnur, Aliya Ospanova und Zhanar Kubasheva. „Preparation of nanocomposite silver/kaolin with antibacterial properties“. MATEC Web of Conferences 340 (2021): 01030. http://dx.doi.org/10.1051/matecconf/202134001030.

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In this study, a nanocomposite based on kaolin from the Alekseevsky deposit (Kazakhstan), containing nano-silver particles, was synthesized. Kaolin has good physical and chemical properties and is an effective carrier for medicines. The synthesis of AgNPs/kaolin nanocomposites was carried out by chemical reduction. Impregnation of silver nanoparticles into silica matrix can prevent the agglomeration of mobile ions, and thereby preserve the antibacterial activity of the compound. The composition and structure of the resulting nanocomposite were studied using SEM/EDS analysis to study the morphology and elemental composition of natural and silver-modified kaolin, the specific surface was determined by the BET method, and functional groups were identified by IR spectroscopy. The resulting composite was tested for antibacterial activity against Gram-negative and Gram-positive bacteria (E.Сoli, S. Aureus).

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Hung, Nguyen Duc, Vu Nang Nam und Le Van Trung. „ELECTROCHEMICAL PREPARATION OF NANO SILVER BY HIGH DC VOLTAGE COMBINED WITH ANODIC PLASMA“. Vietnam Journal of Science and Technology 57, Nr. 2 (05.04.2019): 186. http://dx.doi.org/10.15625/2525-2518/57/2/12578.

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Silver nanoparticles (AgPNs) were prepared by high-voltage electrochemical methods using silver anode to produce silver ions and hydrogen gas at the cathode from electrolysis of distilled water as solvents. The electrolyte solution resulting from the AgPNs product obtained does not contain ions of the electrolyte solution such as conventional chemical or electrochemical methods. Silver anode dissolution process will provide Ag+ and disperse it into distilled water. The process of generating H2 from the electrolysis of H2O disperses into distilled water and escapes upward towards the anode due to the arrangement of the electrolytic vaporizer vertically above the anode and the cathode below. Ag+ and H2's encounter in the aqueous solution will take the oxidation-reduction reaction to form AgPNs. Due to the high-voltage DC electrolytic processes that generate gas on the electrodes, both high-voltage and high magnetic fields, as well as high water-distillation resistance, will increase the solution temperature as favorable conditions to form an electrochemical plasma on the electrodes. The plasma electrode process that separates water into H2 and O2 can occur simultaneously by electrochemical reactions that contribute to the supply of large amounts of gas to participate in oxidative reactions - reducing the formation of AgPNs. The properties of the AgPNs solution prepared by high-voltage DC lines were determined by UV-Vis, electrical conductivity, TEM, zeta potential, particle size distribution as well as content determined by weight lost method, Faraday's law and AAS analysis. Anodic plasma can be generated by stable high voltage mode to decompose water that supports electrochemical reactions that form AgPNs with structural, physicochemical and structural properties as well as comparable constituents be with the current methods.

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Dr. Jeldi Anitha, Lukas Gelibo, Dr. Srikanth Komarabathina und Dr. CH.AI.Raju. „Degradation Of Synthetic Dyes By Green Synthesis Of Silver Nanoparticles Using Leaf Extract“. international journal of engineering technology and management sciences 7, Nr. 5 (2023): 313–18. http://dx.doi.org/10.46647/ijetms.2023.v07i05.036.

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The Textile effluent toxicity is currently a worldwide concern. To address this issue, this study introduced a low-cost, environmentally friendly technique for toxic dye adsorption. Green synthesis has gotten a lot of attention in materials science as a reliable, sustainable, and environmentally friendly method for making a variety of materials/Nano-materials, such as metal/metal oxide nanomaterial’s, hybrid materials, and bio inspired materials. As a result, green synthesis is seen as an important tool for reducing the harmful effects of traditional method. When the aqueous leaf extract was added to the silver nitrate solution, the reaction medium's color changed from pale yellow to brown, indicating that the silver ions were reduced to silver nanoparticles. The UV-Vis spectrophotometer was used to identify the synthesized silver nanoparticles. Scanning electron microscope (SEM) was used to examine dispersion and morphology. The effective functional molecules responsible for the reduction and stabilization of silver nanoparticles synthesized by leaf extract were identified using the FESEM and FTIR spectrum. The present experimentation carried out in a batch process using sorption method. The optimization studies are pH, concentration, temperature and the green synthesized silver nanoparticles effectively degraded the dye by nearly 95 percent.

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Kumaraswamy, Swaroop, Shrikant L. Patil und Somashekarappa H. Mallaiah. „In vitro biocompatibility evaluation of radiolytically synthesized silver/polyvinyl hydrogel nanocomposites for wound dressing applications“. Journal of Bioactive and Compatible Polymers 35, Nr. 4-5 (Juli 2020): 435–50. http://dx.doi.org/10.1177/0883911520944428.

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Nano silver/polyvinyl alcohol hydrogel nanocomposites have been prepared using gamma irradiation technique. Gamma irradiation serves as a crosslinking agent for the polyvinyl alcohol hydrogels and also acts as a reducing agent for reduction of Ag+ ions to zero valent Ag0 within the polyvinyl alcohol crosslinked network. The microstructural characteristics of the prepared composites were studied using powder X-ray diffraction, ultraviolet–visible spectroscopy, Fourier-transform infrared spectroscopy and field emission scanning electron microscopy analysis. The data obtained by these characterizations indicate the homogeneous distribution of silver nanoparticles on the polyvinyl alcohol network. The swelling properties and mechanical parameters of the silver/polyvinyl alcohol hydrogel nanocomposites tend to show improvements, making them a better material for wound care applications. The silver/polyvinyl alcohol hydrogel nanocomposites have shown good antibacterial potential against both Gram-positive and Gram-negative bacteria and shown nil or minimal cytotoxic effect on human melanoma (SK-MEL-2) and mouse melanoma (B16-F1) cell lines. Overall, it was concluded that under optimized condition, silver/polyvinyl alcohol hydrogel nanocomposites synthesized using gamma irradiation technique are excellent candidates for wound dressing application.

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Yang, Yining, Xiaodong Zhou, Ruitao Dong, Yanwei Wang, Zichao Li, Yun Xue und Qun Li. „A Highly Selective and Sensitive Nano-Silver sol Sensor for Hg2+ and Fe3+: Green Preparation and Mechanism“. Polymers 14, Nr. 18 (07.09.2022): 3745. http://dx.doi.org/10.3390/polym14183745.

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The development of highly selective and highly sensitive nanometer colorimetric chemical sensors is an urgent requirement in the immediate detection of heavy metal ions. In this work, silver-nanoparticle (Ag NPs)-based chemosensors were prepared by a simple and green method, in which the silver nitrate, carboxymethyl cellulose sodium (CMS) and Polyvinylpyrrolidone (PVP), and glucose are used as the silver source, double stabilizer and green reductant, respectively. The obtained colloidal CMS/PVP-Ag NPs showed a high dispersibility and stability, and creating a high selectivity and sensitivity to detect Hg2+ and Fe3+ with remarkable and rapid color variation. Low limits of detection (LOD) of 7.1 nM (0–20 μM) and 15.2 nM (20–100 μM) for Hg2+ and 3.6 nM for Fe3+ were achieved. More importantly, the CMS/PVP-Ag NPs has a high sensitivity even in a complex system with multiple heavy ions, the result of the practical ability to detect Hg2+ and Fe3+ in tap water and seawater reached a rational range of 98.33~104.2% (Hg2+) and 98.85~104.80% (Fe3+), indicating the great potential of the as-prepared nanocomposites colorimetric chemosensor for practical applications.

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Hatai, Joydev, Suman Pal und Subhajit Bandyopadhyay. „Fluorescent detection of silver ions in water with organic nano-aggregates“. RSC Advances 2, Nr. 29 (2012): 10941. http://dx.doi.org/10.1039/c2ra21717a.

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