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silver nanoparticle

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https://www.readbyqxmd.com/read/28438002/hot-luminescence-from-gold-nanoflowers-and-its-application-in-high-density-optical-data-storage
#1
Yunbao Zheng, Haiying Liu, Jin Xiang, Qiaofeng Dai, Min Ouyang, Shaolong Tie, Sheng Lan
Gold nanoflowers with feature sizes ranging from several tenths to several hundred nanometers were synthesized by using the one-pot method. They were formed by the self-organization of gold nanoparticles of several nanometers and exhibited broad extinction spectra in the near infrared spectral range. Randomly distributed hot spots originating from the strongly localized modes were generated in gold nanoflowers and their appearances exhibited strong dependences on both the polarization and wavelength of the excitation light...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437606/transfer-study-of-silver-nanoparticles-in-poultry-production
#2
Federica Gallocchio, Giancarlo Biancotto, Veronica Cibin, Carmen Losasso, Simone Belluco, Ruud Peters, Greet van Bemmel, Claudia Cascio, Stefan Weigel, Peter Tromp, Federica Gobbo, Salvatore Catania, Antonia Ricci
Silver nanoparticles (AgNPs) are of interest due to their antimicrobial activity and are seen as potential candidates to replace antibiotics in animal husbandry. A few studies have focused on this new application, but they lack any considerations about residual accumulation of AgNPs in edible animal tissues and animal products. In this research a 22-days in vivo study was carried out by oral administration of 20 nm spherical PVP coated AgNPs to hens. Six doses of approximately 1 mg kg-1 of AgNPs-PVP each were administered to animals throughout the experimentation...
April 24, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28436659/fluorescence-and-scattering-light-cross-correlation-spectroscopy-and-its-applications-in-homogeneous-immunoassay
#3
Jinjie Wang, Xiangyi Huang, Heng Liu, Chaoqing Dong, Jicun Ren
In this work we propose fluorescence and scattering light cross-correlation spectroscopy (FSCCS) based on laser confocal configuration using silver nanoparticle (SNPs) and Alexa Fluor 488 (Alexa) as probe pairs. FSCCS is a single molecule (particle) method, and its principle is similar to that of fluorescence cross-correlation spectroscopy (FCCS). We established the setup of FSCCS using single wavelength laser and developed an immunoassay model of FSCCS. The reliability and adaptability of FSCCS method were evaluated by homogeneous sandwich immunoassay mode...
April 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28436657/role-of-humic-acid-in-the-stability-of-ag-nanoparticles-in-sub-oxic-conditions
#4
Christopher J Milne, Dan J Lapworth, Daren C Gooddy, Christine N Elgy, Eugenia Valsami-Jones
Stability and temporal changes in size distributions have been observed for citrate- and polyvinylpyrrolidone- (PVP) capped silver nanoparticles (AgNPs), in the presence or absence of sulfide and natural organic matter (NOM - as humic acid), whilst under sub-oxic conditions. There were substantial differences in the influence of the two capping agents, with PVP-AgNPs showing few or no significant changes in apparent stability or particle size distribution under the conditions examined, whilst the apparent size distributions of citrate-capped AgNPs changed rapidly...
April 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28436521/well-incorporation-of-carbon-nanodots-with-silicon-nanowire-arrays-featuring-excellent-photocatalytic-performances
#5
Chia-Yun Chen, Po-Hsuan Hsiao, Ta-Cheng Wei, Ting-Chen Chen, Chien-Hsin Tang
Recently, silicon (Si) nanowires have been intensively applied for a wide range of optoelectronic applications. Nevertheless, rare explorations considering the photodegradation of organic pollutants based on Si nanowires were performed, and they still require vast improvement, in particular for their degradation efficiency. In this study, broad-band and high efficiency photocatalytic systems were demonstrated through the good incorporation of Si nanowires with highly fluorescent carbon nanodots. The photodegradation rate of these intriguing heterostructure arrays under a 580 nm light illumination is approximately 6 times higher than that of sole Si nanowires, and more than 3...
April 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28436056/elemental-ion-release-and-cytotoxicity-of-antimicrobial-acrylic-resins-incorporated-with-nanomaterial
#6
Denise Tornavoi de Castro, Mariana Lima da Costa Valente, Carolina Patricia Aires, Oswaldo Luiz Alves, Andréa Cândido Dos Reis
OBJECTIVES: This study evaluated the release of ions and the cytotoxicity of acrylic resins incorporated with silver vanadate decorated with silver nanoparticles (AgVO3 ). BACKGROUND: The inhibition of the accumulation of microorganisms on the resins is critical in preventing diseases. However, the hypothesis is that the release of ions from the incorporation of AgVO3 may be important in biocompatibility. MATERIALS AND METHODS: Specimens of autopolymerising (AP) and heat-polymerising resin (HP) with AgVO3 were prepared and immersed in culture medium...
April 23, 2017: Gerodontology
https://www.readbyqxmd.com/read/28435390/synthesis-and-characterization-of-silver-nanoparticles-from-bis-alkylamine-silver-carboxylate-precursors
#7
Pawel Uznanski, Joanna Zakrzewska, Frederic Favier, Slawomir Kazmierski, Ewa Bryszewska
A comparative study of amine and silver carboxylate adducts [R1COOAg-2(R2NH2)] (R1 = 1, 7, 11; R2 = 8, 12) as a key intermediate in NPs synthesis is carried out via differential scanning calorimetry, solid-state FT-infrared spectroscopy, (13)C CP MAS NMR, powder X-ray diffraction and X-ray photoelectron spectroscopy, and various solution NMR spectroscopies ((1)H and (13)C NMR, pulsed field gradient spin-echo NMR, and ROESY). It is proposed that carboxyl moieties in the presence of amine ligands are bound to silver ions via chelating bidentate type of coordination as opposed to bridging bidentate coordination of pure silver carboxylates resulting from the formation of dimeric units...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/28435262/linseed-hydrogel-mediated-green-synthesis-of-silver-nanoparticles-for-antimicrobial-and-wound-dressing-applications
#8
Muhammad Tahir Haseeb, Muhammad Ajaz Hussain, Khawar Abbas, Bahaa Gm Youssif, Sajid Bashir, Soon Hong Yuk, Syed Nasir Abbas Bukhari
Polysaccharides are being extensively employed for the synthesis of silver nanoparticles (Ag NPs) having diverse morphology and applications. Herein, we present a novel and green synthesis of Ag NPs without using any physical reaction conditions. Linseed hydrogel (LSH) was used as a template to reduce Ag(+) to Ag(0). AgNO3 (10, 20, and 30 mmol) solutions were mixed with LSH suspension in deionized water and exposed to diffused sunlight. Reaction was monitored by noting the change in the color of reaction mixture up to 10 h...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28433872/biosynthesis-of-silver-nanoparticles-by-using-camellia-japonica-leaf-extract-for-the-electrocatalytic-reduction-of-nitrobenzene-and-photocatalytic-degradation-of-eosin-y
#9
R Karthik, Mani Govindasamy, Shen-Ming Chen, Yi-Hui Cheng, P Muthukrishnan, S Padmavathy, A Elangovan
In the present study, sphere-like silver nanoparticles (Ag-NPs) were synthesized by using Camellia japonica leaf extract and its remediation industrial pollutants such as nitrobenzene and Eosin-Y (EY). As-prepared sphere-like Ag-NPs were characterized by various analytical and spectroscopic methods such as UV-visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), High-resolution transmission electron microscopy (HR-TEM), Energy dispersive X-ray spectra (EDX), and the chemical constituents of the leaf extract were also analyzed by using Gas chromatography and Mass Spectroscopy (GC-MS)...
March 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28433807/silver-nanoparticle-induced-toxicity-to-human-sperm-by-increasing-ros-reactive-oxygen-species-production-and-dna-damage
#10
Enyin Wang, Yan Huang, Qingyun Du, Yingpu Sun
Silver nanoparticles (AgNPs) have been used in medical products and industrial coatings, due to their antimicrobial properties. Excessive use of AgNPs can have adverse effects on the human body, however, their toxicity characteristics to human sperm and the potential mechanisms are not entirely clear. In this study, we exposed human sperm to different doses of AgNPs (0, 50μgml(-1), 100μgml(-1), 200μgml(-1) or 400μgml(-1)) for various times (15min, 30min, or 60min), followed by analyses of the sperm viability, motility and the ratio of abnormal to normal sperm...
April 14, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28432916/colorimetric-method-for-the-detection-of-melamine-using-in-situ-formed-silver-nanoparticles-via-tannic-acid
#11
Md Fazle Alam, Amaj Ahmed Laskar, Shahbaz Ahmed, Mohd Azfar Shaida, Hina Younus
Melamine toxicity has recently attracted worldwide attention as it causes renal failure and the death of humans and animals. Therefore, developing a simple, fast and sensitive method for the routine detection of melamine is the need of the hour. Herein, we have developed a selective colorimetric method for the detection of melamine in milk samples based upon in-situ formation of silver nanoparticles (AgNPs) via tannic acid. The AgNPs thus formed were characterized by UV-Visible spectrophotometer, transmission electron microscope (TEM), zetasizer and dynamic light scattering (DLS)...
April 17, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28432654/laser-desorption-ionization-mass-spectrometric-imaging-of-endogenous-lipids-from-rat-brain-tissue-implanted-with-silver-nanoparticles
#12
Ludovic Muller, Kathrine Baldwin, Damon C Barbacci, Shelley N Jackson, Aurélie Roux, Carey D Balaban, Bruce E Brinson, Michael I McCully, Ernest K Lewis, J Albert Schultz, Amina S Woods
Mass spectrometry imaging (MSI) of tissue implanted with silver nanoparticulate (AgNP) matrix generates reproducible imaging of lipids in rodent models of disease and injury. Gas-phase production and acceleration of size-selected 8 nm AgNP is followed by controlled ion beam rastering and soft landing implantation of 500 eV AgNP into tissue. Focused 337 nm laser desorption produces high quality images for most lipid classes in rat brain tissue (in positive mode: galactoceramides, diacylglycerols, ceramides, phosphatidylcholines, cholesteryl ester, and cholesterol, and in negative ion mode: phosphatidylethanolamides, sulfatides, phosphatidylinositol, and sphingomyelins)...
April 21, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28430277/rapid-single-cell-detection-and-identification-of-pathogens-by-using-surface-enhanced-raman-spectroscopy
#13
N E Dina, H Zhou, A Colniţă, N Leopold, T Szoke-Nagy, C Coman, C Haisch
For the successful treatment of infections, real-time analysis and enhanced multiplex capacity, sensitivity and cost-effectiveness of the developed detection method are critical. In this work, surface-enhanced Raman scattering (SERS) was employed with the final aim of identification and discrimination of pathogenic bacteria, based on their detected SERS fingerprint at the single-cell level. Several genera of bacteria that are found in most of the isolated infections in bacteraemia were successfully identified in less than 5 minutes without the use of antibodies or other specific receptors...
April 21, 2017: Analyst
https://www.readbyqxmd.com/read/28429471/formation-of-silver-nanoparticles-by-electron-transfer-in-peptides-and-c-cytochromes
#14
Serhii I Vasylevskyi, Sonja Kracht, Paula Corcosa, Katharina M Fromm, Bernd Giese, Michael Füeg
The reduction of Ag(+) ions to Ag(0) atoms is a highly endergonic reaction step, only the aggregation to Agn clusters leads to an exergonic process. These elementary chemical reactions play a decisive role if Ag nanoparticles (AgNPs) are generated by electron transfer (ET) reactions to Ag(+) ions. We studied the formation of AgNPs in peptides by photoinduced ET, and in c-cytochromes by ET from their Fe(2+) /hemes. Our earlier photoinduced experiments in peptides had demonstrated that histidine prevents AgNP formation...
April 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28428782/a-recombinant-potato-virus-y-infectious-clone-tagged-with-the-rosea1-visual-marker-pvy-ros1-facilitates-the-analysis-of-viral-infectivity-and-allows-the-production-of-large-amounts-of-anthocyanins-in-plants
#15
Teresa Cordero, Mohamed A Mohamed, Juan-José López-Moya, José-Antonio Daròs
Potato virus Y (PVY) is a major threat to the cultivation of potato and other solanaceous plants. By inserting a cDNA coding for the Antirrhinum majus Rosea1 transcription factor into a PVY infectious clone, we created a biotechnological tool (PVY-Ros1) that allows infection by this relevant plant virus to be tracked by the naked eye with no need for complex instrumentation. Rosea1 is an MYB-type transcription factor whose expression activates the biosynthesis of anthocyanin pigments in a dose-specific and cell-autonomous manner...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28428128/novel-combination-of-zero-valent-cu-and-ag-nanoparticles-cellulose-acetate-nanocomposite-for-the-reduction-of-4-nitro-phenol
#16
Farman Ullah Khan, Asimullah, Sher Bahadar Khan, Tahseen Kamal, Abdullah M Asiri, Ihsan Ullah Khan, Kalsoom Akhtar
A very simple and low-cost procedure has been adopted to synthesize efficient copper (Cu), silver (Ag) and copper-silver (Cu-Ag) mixed nanoparticles on the surface of pure cellulose acetate (CA) and cellulose acetate-copper oxide nanocomposite (CA-CuO). All nanoparticles loaded onto CA and CA-CuO presented excellent catalytic ability, but Cu-Ag nanoparticles loaded onto CA-CuO (Cu-Ag/CA-CuO) exhibited outstanding catalytic efficiency to convert 4-nitrophenol (4-NP) into 4-aminophenol (4-AP) in the presence of NaBH4...
April 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28425549/nicotinamide-adenine-dinucleotide-detection-based-on-silver-nanoclusters-stabilized-by-a-dumbbell-shaped-probe
#17
Hong-Ya Wang, Jin-Liang Ma, Bin-Cheng Yin, Bang-Ce Ye
We have developed a novel method for detecting nicotinamide adenine dinucleotide (NAD(+)) based on fluorescent silver nanoclusters (AgNCs) stabilized by a dumbbell-shaped DNA template containing two cytosine-loops joined in a dsDNA stem. The design involves two types of components: a dumbbell-shaped DNA template and three enzymes. In the presence of NAD(+) as a cofactor, Escherichia coli DNA ligase (E.coli DNA ligase) catalyzes template ligation to generate a sealed (no terminal nucleotides) dumbbell-shaped structure, preventing digestion by exonuclease III (Exo III) and exonuclease I (Exo I)...
April 20, 2017: Analyst
https://www.readbyqxmd.com/read/28424491/understanding-the-ion-induced-elongation-of-silver-nanoparticles-embedded-in-silica
#18
Ovidio Peña-Rodríguez, Alejandro Prada, José Olivares, Alicia Oliver, Luis Rodríguez-Fernández, Héctor G Silva-Pereyra, Eduardo Bringa, José Manuel Perlado, Antonio Rivera
In this work we have studied the elongation of silver nanoparticles irradiated with 40 MeV Bromine ions by means of in situ optical measurements, transmission electron microscopy and molecular dynamics simulations. The localized surface plasmon resonance of silver nanoparticles has a strong dependence on the particle shape and size, which allowed us to obtain the geometrical parameters with remarkable accuracy by means of a fit of the optical spectra. Optical results have been compared with transmission electron microscopy images and molecular dynamics simulations and the agreement is excellent in both cases...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28422569/preparation-of-a-novel-antibacterial-chitosan-poly-ethylene-glycol-cryogel-silver-nanoparticles-composites
#19
Xueqing Zou, Pengpeng Deng, Changjiang Zhou, Yulin Hou, Rongsheng Chen, Liang Feng, Liqiong Liao
Cryogel was synthesized through cryogelation of methacrylated carboxymethyl chitosan (mCMC) and poly(ethylene glycol) diacrylate (PEGDA) precursors by photopolymerization. Due to its excellent properties, such as fast swelling behavior, inter-connective porous structure, high water absorbing capacity, especially the presence of abundant carboxylmethyl groups on its backbone, the cryogel not only favored the absorption of silver ions but also was proved to be a good matrix for the incorporation of silver nanoparticles (AgNPs) by in situ chemical reduction...
April 19, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28422486/stable-nanocomposite-based-on-pegylated-and-silver-nanoparticles-loaded-graphene-oxide-for-long-term-antibacterial-activity
#20
Rongtao Zhao, Min Lv, Yang Li, Mingxuan Sun, Wen Kong, Lihua Wang, Shiping Song, Chunhai Fan, Leili Jia, Shaofu Qiu, Yansong Sun, Hongbin Song, Rongzhang Hao
The increasing occurrence of antibiotic-resistant pathogens, especially superbugs, is compromising the efficacy of traditional antibiotics. Silver nanoparticles (AgNPs) loaded graphene oxide (GO) nanocomposite (GO-Ag) has drawn great interest as a promising alternative antibacterial material. However, GO-Ag nanocomposite often irreversibly aggregates in physiological solutions, severely influencing its antibacterial capacity and practical application. Herein, a PEGylated and AgNPs loaded GO nanocomposite (GO-PEG-Ag) is synthesized through a facile approach utilizing microwave irradiation, while avoiding extra reducing agents...
April 19, 2017: ACS Applied Materials & Interfaces
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