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Silver AND Nanoparticles

Xuejie Yue, Tao Zhang, Dongya Yang, Fengxian Qiu, Zhangdi Li, Gengyao Wei, Yu Qiao
To maintain personal thermal comfort in cold weather, indoor heating consumes large amount of energy and is a primary source of greenhouse gas emission. Traditional clothes are too thick for thermal comfort in cold outdoor environment, resulting the lower wearing comfort. In this work, a multifunctional Ag nanoparticles/cellulose fibers thermal insulation membrane starting from waste paper cellulose fibers was prepared via simple silver mirror reaction and subsequent vacuum filtration process to improve the infrared reflection properties of membranes for human thermal insulation...
October 5, 2018: Journal of Colloid and Interface Science
Aida Mohammadi, Danielle Lilly Nicholls, Aristides Docoslis
This study examines the improvements in surface-enhanced Raman scattering (SERS) performance achieved when silver nanodendritic structures are coated with various graphene-based materials, namely graphene oxide (GO), reduced graphene oxide (rGO), and graphene nanoplatelets (GNPs). The tests are performed on our unique SERS-active substrates, prepared on the surface of planar microelectrode chips using an electric field-guided Ag nanoparticle assembly process. The graphene-based materials are introduced into the substrate by means of an in-house spray-coating technique...
October 11, 2018: Sensors
Jongmin Moon, Jin Il Kwak, Youn-Joo An
Silver nanomaterials (AgNMs) of various shapes and sizes are manufactured for different purposes and used as ingredients in a wide variety of products and applications. Recently, the toxicity of AgNMs has attracted significant attention. However, the effect of the shape of AgNMs (particles, wires, plates) on their toxicity in soil ecosystems remains poorly understood. In this study, we added AgNMs of different shapes and sizes (silver nanoparticles, AgNPs; 10 μm silver nanowires, 10-AgNWs; 20 μm silver nanowires, 20-AgNWs; silver nanoplates, AgPLs) to natural soil and determined their effect on the growth and reproduction of the free-living nematode, Caenorhabditis elegans...
October 3, 2018: Chemosphere
Annu, Shakeel Ahmed, Gurpreet Kaur, Praveen Sharma, Sandeep Singh, Saiqa Ikram
This work aimed to synthesize silver nanoparticles via an environmentally benign route, using the aqueous extract of Punica granatum as a precursor as well as a stabilizing and reducing agent. The as-synthesized silver nanoparticles were confirmed using UV-visible spectroscopy with an absorbance peak at 450 nm and were thereafter further confirmed using dynamic light scattering (DLS), High Resolution Transmission Electron Microscopy (HR-TEM) and X-Ray Diffraction (XRD). TEM analysis revealed 6-45 nm and spherically dispersed nanoparticles and XRD showed the crystalline nature of the nanoparticles...
September 1, 2018: Toxicology Research
(no author information available yet)
[This corrects the article on p. 7789 in vol. 12, PMID: 29123393.].
2018: International Journal of Nanomedicine
Zhujun Liu, Hongye Tan, Xiaohong Zhang, Feng Chen, Zhuo Zhou, Xiaodan Hu, Shuquan Chang, Peidang Liu, Haiqian Zhang
Radiotherapy is one of the most widely used treatments for therapy of malignant tumors, but resistance to radiation of hypoxic cells in tumor tissues is still a serious concern. Previous studies have demonstrated that silver nanoparticles (AgNPs) enhance the radiosensitivity of human glioma cells in vitro, but the effect of AgNPs on hypoxic glioma cells has not been investigated in detail. The main purpose of this study is to evaluate the radiosensitizing efficacy of AgNPs on hypoxic glioma cells. The half maximal inhibitory concentration (IC50) values of AgNPs for the hypoxic U251 cells and C6 cells were 30...
October 11, 2018: Artificial Cells, Nanomedicine, and Biotechnology
Rajan Ramachandran, Chandran Krishnaraj, V K Abhay Kumar, Stacey L Harper, Thangavelu P Kalaichelvan, Soon-Il Yun
In this study, toxicity of biologically synthesized silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) was compared using zebrafish as a model organism. At 96 h, LC50 of AgNPs and AuNPs was found to be 24.5 µg/L and 41 mg/L, respectively. Following the LC50 determination, half of the LC50 of AgNPs (12.25 µg/L) and AuNPs (20.5 mg/L) was exposed to adult zebrafishes for 14 days. Morphological changes, liver marker enzymes, reactive oxygen species (ROS) generation, genotoxic effects and mRNA expression levels of oxidative stress and innate immune response related genes were studied using nanoparticle treated gill, liver and blood cells...
October 2018: 3 Biotech
Ferdos Albayedh, James C L Chow
This study focused on the imaging in radiotherapy by finding the relationship between the imaging contrast ratio and appropriate gold, iodine, iron oxide, silver, and platinum nanoparticle concentrations; the relationship between the imaging contrast ratio and different beam energies for the different nanoparticle concentrations; the relationship between the contrast ratio and various beam energies for gold nanoparticles; and the relationship between the contrast ratio and different thicknesses of the incident layer of the phantom including variety of gold nanoparticles (GNPs) concentration...
July 2018: Journal of Medical Physics
Yan Huang, Xiaoqiang Lü, Xiaoying Lü
The aim of this study was to screen and research key biological pathways and important microRNAs (miRNAs) involved in silver nanoparticles (SNPs) induced cytotoxicity using miRNA sequencing technology. First, the influences of five SNPs with different sizes (∼5, ∼20, ∼50, ∼100 and ∼200 nm), named as SNP-5, SNP-20, SNP-50, SNP-100, and SNP-200, on human dermal fibroblasts (HDFs) proliferation were evaluated by MTT assay after 4, 8, 12, 24, 48 and 72 h. miRNA sequencing technology was then utilized to screen differentially expressed miRNAs in SNPs treated HDFs for 4 h...
December 1, 2018: Journal of Biomedical Nanotechnology
Mohamed A Lebda, Kadry M Sadek, Hossam G Tohamy, Tarek K Abouzed, Mostafa Shukry, Masakazu Umezawa, Yasser S El-Sayed
AIMS: This study explored whether silver nanoparticles (AgNPs) can disrupt tight-junctions integrity resulted in blood-brain barrier dysfunction along with oxidative stress, pro-inflammation, and apoptosis induction. Additionally, neuroprotective of α-lipoic acid (LA) and Ginkgo biloba (GB) were investigated. MAIN METHODS: Forty adults rats were enrolled into; Control, AgNPs (50 mg/kg), LA (100 mg LA/kg) + AgNPs, and GB (120 mg/kg) + AgNPs. After 30 days, neuronal changes were assessed biochemically and histopathologically...
October 7, 2018: Life Sciences
Xiaowen Lv, Huanru Wang, Airong Su, Ying Chu
Silver nanoparticles have been widely applied for biomedical areas owing to their potent antiviral and antibacterial activities. Synthesis of silver nanoparticles using biomacromolecules is more efficient, environment-friendly, and cost-saving compared with the traditional approach. In this paper, a novel approach was developed to establish a reaction system with Ag+ -BH4- -sericin to synthesize silver nanoparticles conjugated to sericin (AgNPs-Sericin). Sericin could be as a good dispersant and stabilizing agent, which is able to modify nanoscaled AgNPs, the average diameter of which was only 3...
August 28, 2018: Journal of Microbiology and Biotechnology
Satoaki Onitsuka, Toshiyuki Hamada, Hiroaki Okamura
Gold and silver nanoparticles were prepared from the green tea and black tea extracts of the leaves of Camellia sinensis. The metal nanoparticle solutions were obtained by reacting HAuCl4 or AgNO3 aqueous solutions with aqueous NaHCO3 and tea leaf extracts, which were obtained from used tea leaves at low temperature, under ambient conditions. The nanoparticles were stable at room temperature and had a uniform particle size (Au: ∼10 nm, Ag: ∼30 nm). Nanoparticle-immobilized cotton cloths were then prepared, which displayed high antibacterial activity and a characteristic color, thereby showing potential application as antimicrobial pigments...
September 27, 2018: Colloids and Surfaces. B, Biointerfaces
Weicheng Zhang, Jiaolong Huang, Lei Liang, Lunguang Yao, Tao Fang
Cytotoxicity of silver nanoparticles (Ag NPs) is attributed to silver internalization, which can be depressed by dissolved organic matter (DOM) to form Ag-DOM. Ag-DOM are bioavailable and then silver internalization could be increased. Herein, 3 and 48-h Escherichia coli viability bioassays were employed to evaluate effect of fulvic acid and humic acid (10 mg L-1 ) on cytotoxicity of 30 and 100 nm PVP-Ag NPs. Moreover, zebrafish embryos were used as reference model to understand silver internalization routes...
October 2, 2018: Chemosphere
Raquel Osorio, Estrella Osorio, Fátima S Aguilera, Antonio Luis Medina-Castillo, Manuel Toledano, Manuel Toledano-Osorio
OBJECTIVE: This study aimed to evaluate the effect of silver loaded nanoparticles (NPs) application on dentin remineralization. METHODS: Polymethylmetacrylate-based NPs and silver loaded NPs (Ag-NPs) were applied on demineralized dentin surfaces. Dentin was characterized morphologically by scanning electron microscopy, mechanically probed by a nanoindenter to test nanohardness and Young modulus, and chemically analyzed by Raman spectroscopy after 24 h and 7 d of storage...
October 5, 2018: Journal of Dentistry
S Chandra Sekhar, Goli Nagaraju, Bhimanaboina Ramulu, Jae Su Yu
We facilely prepared silver nanoparticles-decorated Ce6Mo10O39 marigold flower-like structures (Ag NPs@CM MFs) for use as an effective positive material in hybrid supercapacitors (HSCs). With an aid of ethylenediaminetetracetic acid (EDTA) as a chelating agent, the self-assembled CM MFs were synthesized by a single-step hydrothermal method. When the electrochemical properties were tested in aqueous alkaline electrolyte, the synthesized CM MFs with 0.15 g of EDTA exhibited a relatively high charge storage property (55...
October 8, 2018: ACS Applied Materials & Interfaces
Yu-Ci Liu, Chia-Hui Hsu, Bing-Jyun Lu, Peng-Yi Lin, Mei-Lin Ho
A new microfluidic paper-based analytical device, a (Ag-μPAD)-based chemiresistor composed of silver ink, has been developed for the selective, sensitive, and quantitative determination of nitrite ions in environmental analysis. The silver ink acts as an efficient transducer in terms of resistance changes due to nitrite initiating a diazo reaction and further reacting with the ink. The silver ink is synthesized onto the μPADs by pulsed light sintering from silver nanoparticles, a mixture of silver nanowires and nanoparticles...
October 8, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Kapil Punjabi, Sourabh Mehta, Rujuta Chavan, Vidushi Chitalia, Dhanashree Deogharkar, Sunita Deshpande
Biosynthesis of metallic nanoparticles has acquired particular attention due to its economic feasibility, low toxicity, and simplicity of the process. In this study, extracellular synthesis of silver and zinc nanoparticle was carried out by Pseudomonas hibiscicola isolated from the effluent of an electroplating industry in Mumbai. Characterization studies revealed synthesis of 40 and 60 nm nanoparticles of silver (AgNP) and zinc (ZnNP), respectively, with distinct morphology as observed in TEM and its crystalline nature confirmed by XRD...
2018: Frontiers in Microbiology
Abdallah M Elgorban, Abd El-Rahim M El-Samawaty, Omar H Abd-Elkader, Mohamed A Yassin, Shaban R M Sayed, Mujeeb Khan, Syed Farooq Adil
Microorganisms based biosynthesis of nanomaterials has triggered significant attention, due to their great potential as vast source of the production of biocompatible nanoparticles (NPs). Such biosynthesized functional nanomaterials can be used for various biomedical applications. The present study investigates the green synthesis of silver nanoparticles (Ag NPs) using the fungus Curvularia pallescens ( C. pallescens ) which is isolated from cereals. The C. pallescens cell filtrate was used for the reduction of AgNO3 to Ag NPs...
November 2017: Saudi Journal of Biological Sciences
Seetharam Charannya, Dasarathan Duraivel, Krishnan Padminee, Saravanan Poorni, Cruz Nishanthine, Manali Ramakrishnan Srinivasan
Context: Silver nanoparticle (AgNP) is a potent antimicrobial that is widely used in several fields of medicine. Chlorhexidine (CHX) gluconate is a well-known agent used in dentistry to eliminate oral microbial flora. Aims: The aim of this study is to evaluate the efficacy of AgNPs, 2% CHX gluconate, and the combination of two solutions against endodontic pathogens such as Enterococcus faecalis , Klebsiella pneumoniae , and Candida albicans . These organisms are frequently found in the root canal space and their persistence may lead to endodontic failure...
September 2018: Contemporary Clinical Dentistry
Abdolhossien Miri, Mina Sarani
The evaluation of cytotoxic and apoptotic activities of silver nanoparticles (Ag-NPs) synthesized by aqueous extract of Prosopis farcta was investigated against lung (A549) and colon (HT-29) cell lines. The cytotoxic activity of nanoparticles was performed using MTT assay, while their apoptotic activity was tested using TUNEL method. The obtained results of MTT showed that the cell viability of A549 was dependent on the nanoparticles concentration and incubation time. Therefore, although the cytotoxic effect increased as the Ag-NPs concentration and incubation time heightened, yet the viability of HT-29 cells seems to be dependent only on the incubation time...
October 6, 2018: Molecular Biology Reports
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