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silver nano particle

Bahattin Kemah, Gökçer Uzer, Yalçın Turhan, Burak Özturan, Bülent Kılıç, Bilge Sümbül Gültepe, Ayşe Bahar Ceyran, Selim Ertürk, Burak Aksoylu, Özlem Şenaydın, Korhan Özkan
Purpose : Bone and soft tissue infections are among the least desired complications after orthopaedic surgery. This study analysed the in vivo effects of the local application of nano-silver particles (AgNPs) [1nm = 1 billionth of a meter] in soft tissue infections. Materials-Method : An experimental osteomyelitis model was formed by inoculating both tibias of 24 rats with methicillin-resistant Staphylococcus aureus . The rats were followed without treatment for 21 days. Blood samples and tibial x-rays at day 21 confirmed the development of infection...
2018: Journal of Bone and Joint Infection
Anuraj Kshirsagar, Tanaya Khanna, Vaishali Dhanwe, Kunal H Kate, Pawan K Khanna
Avoiding use of environmentally hazardous reducing agents and surfactants like sodium borohydride, hydrazine hydrate, alkyl amines and alkyl phosphines, the current article describes successful synthesis of silver nanoparticles via green synthesis by employing coconut, Indian gooseberry (amla), almond and mustard oils as capping as well as reducing agents. The presence of various fatty acids in such edible oils act as capping agents through their carboxylic acid functionality and control the growth of nanoparticles...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Yong Huang, Guiqin Song, Xiaotong Chang, Zhenhui Wang, Xuejiao Zhang, Shuguang Han, Zhuobin Su, Hejie Yang, Dongdong Yang, Xiaojun Zhang
Background: Poor mechanical properties, undesirable fast dissolution rate, and lack of antibacterial activity limit the application of hydroxyapatite (HA) as an implant coating material. To overcome these limitations, a hybrid coating of Ag+ -substituted fluorhydroxyapatite and titania nanotube (TNT) was prepared. Methods: The incorporation of silver into the HA-TiO2 hybrid coating improves its antimicrobial properties. The addition of F as a second binary element increases the structural stability of the coating...
2018: International Journal of Nanomedicine
Fabio Polesel, Julia Farkas, Marianne Kjos, Patricia Almeida Carvalho, Xavier Flores-Alsina, Krist V Gernaey, Steffen Foss Hansen, Benedek Gy Plósz, Andy M Booth
Due to their widespread application in consumer products, elemental titanium (e.g., titanium dioxide, TiO2 ) and silver (Ag), also in nanoparticulate form, are increasingly released from households and industrial facilities to urban wastewater treatment plants (WWTPs). A seven-day sampling campaign was conducted in two full-scale WWTPs in Trondheim (Norway) employing only primary treatment. We assessed the occurrence and elimination of Ti and Ag, and conducted size-based fractionation using sequential filtration of influent samples to separate particulate, colloidal and dissolved fractions...
April 30, 2018: Water Research
Yue Suo Yang, Chen Wang, Xue Mei Yuan, Chang Wei An, Xin Yao Yang
Silver nanoparticles (AgNPs) as one of the most widely used metal nanomaterials can enter soil and water environment via various pathways, exert toxicity on water-borne organisms and deteriorate the aquatic eco-environment. With complex composition of natural water, the physicochemical property of AgNPs as nano materials makes their transformation process more complicated in water system. Therefore, understanding of the fate and transport of AgNPs in aqueous environment is extremely important for water quality management and protection of the eco-environment...
June 18, 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Milon Banik, Mousumi Patra, Debanjan Dutta, Riya Mukherjee, Tarakdas Basu
A simple method of synthesis of stable bimetallic copper-silver nanoparticle (Cu@Ag NP) was developed by successive reduction of Cu(NO3)2 and AgNO3, using hydrazine hydrate as the reducing agent and gelatine and Poly-vinyl pyrrolidone (PVP) as the capping agents. The round-shaped particles were of core-shell structure with a core of Cu0 atoms surrounded by a shell of Ag0 atoms. The size and the mol. wt. of the NPs were (100 ± 10) nm and (820 ± 157) Kd respectively; the particles were crystalline in nature and 90% of the precursors Cu(NO3)2 and AgNO3 were converted to the NPs...
May 9, 2018: Nanotechnology
Yiping Chen, Yunlei Xianyu, Mingling Dong, Jiangjiang Zhang, Wenshu Zheng, Zhiyong Qian, Xingyu Jiang
Conventional magnetic relaxation switching (MRS) sensor suffers from its relatively low sensitivity when it comes to the analysis of trace small molecules in complicated samples. To meet this challenge, we develop a cascade reaction-mediated magnetic relaxation switching (CR-MRS) sensor, based on the assembly of silver nanoparticles (Ag NPs) and magnetic nanoparticles (MNPs) to improve sensitivity of conventional MRS. The cascade reaction triggered by alkaline phosphatase generates ascorbic acid, which reduces Ag+ to Ag NPs that can assemble the initially dispersed MNPs to form magnetic/silver nano-assemblies, thus modulating the state of MNPs to result in the change of transverse relaxation time...
May 4, 2018: Analytical Chemistry
Christopher A Little, Ruochen Xie, Christopher Batchelor-McAuley, Enno Kätelhön, Xiuting Li, Neil P Young, Richard G Compton
Herein we provide a generic framework for use in the acquisition and analysis of the electrochemical responses of individual nanoparticles, summarising aspects that must be considered to avoid mis-interpretation of data. Specifically, we threefold highlight the importance of the nanoparticle shape, the effect of the nanoparticle diffusion coefficient on the probability of it being observed and the influence of the used measurement bandwidth. Using the oxidation of silver nanoparticles as a model system, it is evidenced that when all of the above have been accounted for, the experimental data is consistent with being associated with the complete oxidation of the nanoparticles (50 nm diameter)...
May 4, 2018: Physical Chemistry Chemical Physics: PCCP
Conor Francis McGee, Sean Storey, Nicholas Clipson, Evelyn Doyle
The growing use of silver nanoparticles (AgNPs) is likely to result in increased environmental contamination. Although AgNPs have been reported to affect microbial communities in a range of ecosystems, there is still a lack of information concerning the effect of low concentrations of AgNPs on soil microbial community structures and functional groups involved in biogeochemical cycling. In this study, the concentration-dependent effects of AgNPs and silver micron particles (AgMPs) on bacterial and fungal community structures in an agricultural pastureland soil were examined in a microcosm-based experiment using enzyme analysis, molecular fingerprinting, qPCR and amplicon sequencing...
April 29, 2018: Environmental Science and Pollution Research International
Alaknanda J Adur, N Nandini, K Shilpashree Mayachar, R Ramya, N Srinatha
Silver nanoparticles were prepared through eco-friendly, cost effective, bio-mediated technique using anaerobically digested Parthenium hysterophorous digested slurry (PDS) for the first time. The synthesized nanoparticles were characterized through different techniques such as UV-Vis spectrophotometer for optical properties; X-ray diffractometer (XRD), high resolution transmission electron spectroscopy (HR-TEM) and Fourier Transform Infra Red (FTIR) Spectroscopy for structural property investigations. It was observed that the prepared silver nanoparticles were crystallized in face centered cubic crystal structure with an average particle size of 19 nm as confirmed from XRD...
April 16, 2018: Journal of Photochemistry and Photobiology. B, Biology
Liming Xu, Ru Bai, Xiang Cheng, Anliang Shao, Liang Chen, Shuxin Qu, Chunying Chen
Silver-containing dressings are widely used for wound care owing to their broad-spectrum microbicidal activity. However, the potential adverse effects on human health emerging from exposure to their active ingredients (silver ions or nanoparticles) have resulted in widespread concerns about their use. The release profiles of various chemical forms of silver (Ag) from silver-containing dressing are closely related to their bioavailability and potential adverse effects on the body. In this research, we demonstrated a tiered experimental approach for systematic characterization and assessment of silver-containing wound dressing, which provides information for risk assessments...
March 1, 2018: Journal of Biomedical Nanotechnology
H M Fahmy, A A Aly, A Abou-Okeil
Novel wound dressings composed of non-woven cotton (NWC) fabric and multilayer of hyaluronan (HA) and chitosan were built using layer-by-layer assembly technique. Factors affecting the building up of that dressings such as HA concentration, number of coating layers and nitrogen content of the NWC fabric quaternized form were studied. Meanwhile, some physico-chemical properties of such dressings were investigated. Moreover, to enhance the antibacterial properties of the aforementioned dressings, Silver nano-particles (Ag NPs) were prepared and incorporated as a functional additive in the final HA layer of such dressings...
March 26, 2018: International Journal of Biological Macromolecules
Ziqiu Tong, Gayathri Rajeev, Keying Guo, Angela Ivask, Scott McCormick, Enzo Lombi, Craig Priest, Nicolas H Voelcker
With advances in nanotechnology, particles with various size, shape, surface chemistry, and composition can be easily produced. Nano- and microparticles have been extensively explored in many industrial and clinical applications. Ensuring that the particles themselves are not possessing toxic effects to the biological system is of paramount importance. This paper describes a proof of concept method, in which a microfluidic system is used in conjunction with a cell microarray technique aiming to streamline the analysis of particle-cell interaction in a high throughput manner...
April 3, 2018: Analytical Chemistry
Ming Liu, Rong Xiang, Yaerim Lee, Keigo Otsuka, Ya-Lun Ho, Taiki Inoue, Shohei Chiashi, Jean-Jacques Delaunay, Shigeo Maruyama
We present a systematic study on the fabrication, characterization and high temperature surface enhanced Raman spectroscopy (SERS) performance of SiO2 coated silver nanoparticles (Ag@SiO2 ) on a flat substrate, aiming to obtain a thermally robust SERS substrate for monitoring high temperature reactions. We confirm that a 10-15 nm SiO2 coating provides a structure stability up to 900 °C without significantly sacrificing the enhancement factor, while the uncoated particle cannot retain the SERS effect above 500 °C...
March 28, 2018: Nanoscale
Mina Amirsoleimani, Mohammad A Khalilzadeh, Fatemeh Sadeghifar, Hasan Sadeghifar
Starch nanocrystal was prepared using weak sulfuric acid hydrolysis at 40 °C. Transmission electron micrographs of dilute suspensions of starch nanocrystals showed round particles with a diameter ranging from 20 to 40 nm. SEM of freeze dried samples showed separated particles between 40 and 100 nm and confirmed production of starch nano particles. XRD patterns obtained for the prepared nanostarch and raw starch sample showed no special pattern of crystallinity for starch sample. Extracted nanostarch showed pattern of crystallinity with the peaks at Bragg angles (2θ) at about 15° and 23°, and a doublet at 17° and 18°...
March 2018: Journal of Food Science and Technology
Ji-Hyun Kim, Sang-Won Park, Hyun-Pil Lim, Chan Park, Kwi-Dug Yun
The major failure of dental restorations is caused by dental caries by S. mutans. This study evaluated the effect of nanosized silver ions in feldspathic porcelain on cytotoxicity and antimicrobial activity. The control group was feldspathic porcelain (Noritake EX-3, Kuraray Noritake Dental Inc., Japan) that did not contain Ag (silver). The experimental groups were feldspathic porcelain mixed with colloidal solutions of nanosized silver ions in mixtures of 5% 10%, 20%, 30%. Cell activity assays evaluated with osteoblast hFOB 1...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Guanhui Gao, Lingwei Wang, Peng Yang, Liang Huang, Xiaobin Xie, Jingsong Wu, Chen Qiu, Lintao Cai
We developed a facile and green bio-inspired strategy to fabricate silver nano-particles growth in-situ on different scaffolds materials, building novel heterostructures for promoting their antibacterial activities and durability. Firstly, fluorinated graphene oxide (FGO) nanosheets, layered molybdenum disulfide (MoS2), and layered tungsten disulfide (WS2) were exfoliated by chemical liquid with intense sonication. And silicon dioxide (SiO2) nano-spheres were prepared via wet chemical method. Then, silver nanoparticles were grown onto those surfaces of layered nanosheets and nano-spheres, hybridizing three dimensional hetero-architectures...
June 1, 2018: Journal of Nanoscience and Nanotechnology
Mavlavi Dustov, Diana I Golovina, Alexander Yu Polyakov, Anastasia E Goldt, Andrei A Eliseev, Efim A Kolesnikov, Irina V Sukhorukova, Dmitry V Shtansky, Wolfgang Grünert, Anastasia V Grigorieva
A new reactive ink based on a silver citrate complex is proposed for a photochemical route to surface-enhanced Raman spectroscopy active substrates with controllable extinction spectra. The drop-cast test of the ink reveals homogeneous nucleation of silver and colloid particle growth originating directly from photochemical in situ reduction in droplets, while the following evaporation of the deposited ink produces small nano- and micron-size particles. The prepared nanostructures and substrates were accurately characterized by electron microscopy methods and optical extinction spectroscopy...
February 9, 2018: Sensors
Sabine Juling, Linda Böhmert, Dajana Lichtenstein, Axel Oberemm, Otto Creutzenberg, Andreas F Thünemann, Albert Braeuning, Alfonso Lampen
The presence of nano-scaled particles in food and food-related products has drawn attention to the oral uptake of nanoparticles and their interactions with biological systems. In the present study, we used a toxicoproteomics approach to allow for the untargeted experimental identification and comparative analysis of cellular responses in rat liver after repeated-dose treatment with silver nanoparticles, ions, and the coating matrix used for particle stabilization. The proteomic analysis revealed treatment-related effects caused by exposure to silver in particulate and ionic form...
March 2018: Food and Chemical Toxicology
Jeffrey E Melzer, Euan McLeod
Optical tweezers are a noncontact method of 3D positioning applicable to the fields of micro- and nanomanipulation and assembly, among others. In these applications, the ability to manipulate particles over relatively long distances at high speed is essential in determining overall process efficiency and throughput. In order to maximize manipulation speeds, it is necessary to increase the trapping laser power, which is often accompanied by undesirable heating effects due to material absorption. As such, the majority of previous studies focus primarily on trapping large dielectric microspheres using slow movement speeds at low laser powers, over relatively short translation distances...
March 27, 2018: ACS Nano
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