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silver nano particle

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https://www.readbyqxmd.com/read/28772987/preparation-of-superhydrophobic-film-on-ti-substrate-and-its-anticorrosion-property
#1
Min Zhu, Wenchuan Tang, Luyao Huang, Dawei Zhang, Cuiwei Du, Gaohong Yu, Ming Chen, Thee Chowwanonthapunya
Superhydrophobic films were fabricated on a titanium substrate with or without anodizing by using a self-assembling method. Firstly, the pretreatments of mechanical polishing/anodizing or mechanical polishing only were conducted, respectively. Subsequently, the preparation of polydopamine film layer, deposition of nano-silver particles, and post modification of 1H,1H,2H,2H-perfluorodecanethiol were performed on the surface of the pretreated substrate. The surface morphologies, compositions, wettability, and corrosion resistance of the films were investigated with scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), water contact angle measurements, and electrochemical tests, respectively...
June 8, 2017: Materials
https://www.readbyqxmd.com/read/28756157/degradation-of-anthropogenic-pollutant-and-organic-dyes-by-biosynthesized-silver-nano-catalyst-from-cicer-arietinum-leaves
#2
Geeta Arya, Nikita Sharma, Jahangir Ahmed, Nidhi Gupta, Ajeet Kumar, Ramesh Chandra, Surendra Nimesh
The work represents the potent catalytic activity of silver nanoparticles synthesized from Cicer arietinum (chickpea) leaf extract (CAL-AgNPs). Here, silver nano-catalysts were used against the anthropogenic pollutants mainly involving nitro-amines and azo dyes. These pollutants are extremely harmful to our environment and causes severe health issues. The CAL-AgNPs have the potential to degrade harmful toxins and their by-products, thereby decreasing the pollutants from the environment. The green synthesis of nano-catalyst includes a simple, cost effective and eco-friendly method using the leaf extract from the plant...
July 22, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28734568/antibacterial-properties-of-nano-silver-coated-peek-prepared-through-magnetron-sputtering
#3
Xiuju Liu, Kang Gan, Hong Liu, Xiaoqing Song, Tianjie Chen, Chenchen Liu
OBJECTVE: We aimed to investigate the cytotoxicity and antibacterial properties of nano-silver-coated polyetheretherketone (PEEK) produced through magnetron sputtering and provide a theoretical basis for its use in clinical applications. METHODS: The surfaces of PEEKs were coated with nano-silver at varying thicknesses (3, 6, 9, and 12nm) through magnetron sputtering technology. The resulting coated PEEK samples were classified into the following groups according to the thickness of the nano-silver coating: PEEK-3 (3nm), PEEK-6 (6nm), PEEK-9 (9nm), PEEK-12 (12nm), and PEEK control group...
July 19, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28732869/in-situ-formation-of-supramolecular-aggregates-between-chitin-nanofibers-and-silver-nanoparticles
#4
Ruchira N Wijesena, Nadeeka D Tissera, Charith Abeyratne, Osura M Bangamuwa, Natalie Ludowyke, Damayanthi Dahanayake, Sunanda Gunasekara, Nuwan de Silva, Rohini M de Silva, K M Nalin de Silva
Chitin and chitin derivatives have gained significant research interest over the years due to a number of beneficial properties that can be exploited in various application fields. Particularly, interactions between their nanostructures and other nanomaterials are of great interest. In situ photo-reduction of AgCl in chitin nanofiber aqueous dispersions resulted in significant loss of colloidal stability of both chitin nanofibers (CNF) and silver nanoparticles. UV-vis spectroscopy was used to characterize the extinction profiles of in-situ prepared CNF and several silver nanoparticle mixtures over the reaction steps...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28728033/deposition-pattern-and-tracer-particle-motion-of-evaporating-multi-component-sessile-droplets
#5
Muhammad Amjad, Yang Yang, Ghulam Raza, Hui Gao, Jun Zhang, Leping Zhou, Xiaoze Du, Dongsheng Wen
The understanding of near-wall motion, evaporation behavior and dry pattern of sessile nanofluid droplets is fundamental to a wide range of applications such as painting, spray drying, thin film coating, fuel injection and inkjet printing. However, a deep insight into the heat transfer, fluid flow, near-wall particle velocity and their effects on the resulting dry patterns is still much needed to take the full advantage of these nano-sized particles in the droplet. This work investigates the effect of direct absorptive silicon/silver (Si/Ag) hybrid nanofluids via two experiments...
July 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28723090/transformative-heterointerface-evolution-and-plasmonic-tuning-of-anisotropic-trimetallic-nanoparticles
#6
Mouhong Lin, Gyeong-Hwan Kim, Jae-Ho Kim, Jeong-Wook Oh, Jwa-Min Nam
Multicomponent nanoparticles that incorporate multiple nanocrystal domains into a single particle represent an important class of material with highly tailorable structures and properties. The controlled synthesis of multicomponent NPs with 3 or more components in the desired structure, particularly anisotropic structure, and property is, however, challenging. Here, we developed a polymer and galvanic replacement reaction-based transformative heterointerface evolution (THE) method to form and tune gold-copper-silver multimetallic anisotropic nanoparticles (MAPs) with well-defined configurations, including structural order, particle and junction geometry, giving rise to extraordinarily high tunability in the structural design, synthesis and optical property of trimetallic plasmonic nanoantenna structures...
July 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28715175/airborne-nanoparticle-release-and-toxicological-risk-from-metal-oxide-coated-textiles-toward-a-multiscale-safe-by-design-approach
#7
Paride Mantecca, Kaja Kasemets, Archana Deokar, Ilana Perelshtein, Aharon Gedanken, Yeon Kyoung Bahk, Baharh Kianfar, Jing Wang
Nano metal oxides have been proposed as alternatives to silver (Ag) nanoparticles (NPs) for antibacterial coatings. Here, cotton and polyester-cotton fabrics were sonochemically coated with zinc oxide (ZnO) and copper oxide (CuO) NPs. By varying the reaction solvent (water or ethanol), NPs with different sizes and shapes were synthesized. The cytotoxic and pro-inflammatory effects of studied NPs were investigated in vitro in human alveolar epithelial A549 and macrophage-like THP1 cells. To understand the potential respiratory impact of the NPs, the coated textiles were subjected to the abrasion tests, and the released airborne particles were measured...
July 28, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28709896/comparative-study-on-antifungal-activities-of-chitosan-nanoparticles-and-chitosan-silver-nano-composites-against-fusarium-oxysporum-species-complex
#8
S H S Dananjaya, W K C U Erandani, Cheol-Hee Kim, Chamilani Nikapitiya, Jehee Lee, Mahanama De Zoysa
Though the metal nanoparticles (NPs) have been shown favorable results against fungal diseases, erratic environmental toxicity of NPs have raised serious concerns against their applications. Hence, it is vital to modify antifungal compounds into safe substitutes over synthetic chemicals. In this study, antifungal effects of chitosan nanoparticles (CNPs) and chitosan silver nanocomposites (CAgNCs) were compared against Fusarium oxysporum species complex. CNPs and CAgNCs were synthesized, characterized and compared based on the transmission electron microscope, X-ray diffraction, UV-vis absorbance spectra, particle size distribution, zeta potential and thermal stability analysis...
July 11, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28627324/preparation-characterization-and-in-vitro-cytotoxicity-of-chitosan-hydrogels-containing-silver-nanoparticles
#9
Bożena Tyliszczak, Anna Drabczyk, Sonia Kudłacik-Kramarczyk, Agnieszka Sobczak-Kupiec
Hydrogels, chitosan as well as silver nanoparticles become in recent years materials characterized by a great interest. In present paper hydrogel based on chitosan and containing mentioned type of nano-sized particles have been synthesized by means of photopolymerization. Sorption capacity in selected liquids as well as behavior in simulated body fluid (such as Ringer's liquid) have been determined. Particularly attention was paid to the studies on toxicity of the hydrogels in relation to the epidermal cells as well as on their impact on growth of selected strain of bacteria (Escherichia coli)...
June 26, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28609256/nano-metal-oxides-exposure-and-engineering-control-assessment
#10
Alberto Garcia, Adrienne Eastlake, Jennifer L Topmiller, Christopher Sparks, Kenneth Martinez, Charles L Geraci
In January 2007, the National Institute for Occupational Safety and Health (NIOSH) conducted a field study to evaluate process specific emissions during the production of ENMs. This study was performed using the nanoparticle emission assessment technique (NEAT). During this study, it was determined that ENMs were released during production and cleaning of the process reactor. Airborne concentrations of silver, nickel, and iron were found both in the employee's personal breathing zone and area samples during reactor cleaning...
June 13, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28603966/silver-alginate-hydrogel-micro-and-nanocontainers-for-theranostics-synthesis-encapsulation-remote-release-and-detection
#11
Ekaterina Lengert, Mariia Saveleva, Anatolii Abalymov, Vsevolod Atkin, Pieter C Wuytens, Roman Kamyshinsky, Alexander L Vasiliev, Dmitry A Gorin, Gleb B Sukhorukov, Andre G Skirtach, Bogdan Parakhonskiy
We have designed multifunctional silver alginate hydrogel microcontainers referred to as loaded microcapsules with different sizes by assembling them via a template assisted approach using natural, highly porous calcium carbonate cores. Sodium alginate was immobilized into the pores of calcium carbonate particles of different sizes followed by cross-linking via addition of silver ions, which had a dual purpose: on one hand, the were used as a cross-linking agent, albeit in the monovalent form, while on the other hand they have led to formation of silver nanoparticles...
June 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28589745/green-synthesis-of-tea-ag-nanocomposite-hydrogels-via-mint-leaf-extraction-for-effective-antibacterial-activity
#12
Tippabattini Jayaramudu, Kokkarachedu Varaprasad, Gownolla Malegowd Raghavendra, E R Sadiku, Konduru Mohana Raju, John Amalraj
In this report, we investigated the swelling behavior and antibacterial property of nanosilver composite hydrogels made from tea with polyacrylamide via a free-radical polymerization and green process technique. This is probably for the first time; tea-based nano silver composite hydrogels were developed. The composite hydrogels comprise embedded nano silver particles in the tea hydrogel matrix via a green process with mint leaf extract. The size of the nano silver particles in the hydrogel matrix was found to be < 10 nm...
June 22, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28581710/biotransformation-of-silver-released-from-nanoparticle-coated-titanium-implants-revealed-in-regenerating-bone
#13
Hua Geng, Gowsihan Poologasundarampillai, Naomi Todd, Aine Devlin-Mullin, Katie L Moore, Zahra Golrokhi, James B Gilchrist, Eric Jones, Richard J Potter, Chris Sutcliffe, Marie O'Brien, David W L Hukins, Sarah Cartmell, Christopher A Mitchell, Peter D Lee
Antimicrobial silver nanoparticle coatings have attracted interest for reducing prosthetic joint infection. However, few studies report in vivo investigations of the biotransformation of silver nanoparticles within the regenerating tissue and its impact on bone formation. We present a longitudinal investigation of the osseointegration of silver nanoparticle-coated additive manufactured titanium implants in rat tibial defects. Correlative imaging at different time points using nanoscale secondary ion mass spectrometry, transmission electron microscopy (TEM), histomorphometry, and 3D X-ray microcomputed tomography provided quantitative insight from the nano- to macroscales...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28575994/plla-microcapsules-combined-with-silver-nanoparticles-and-chlorhexidine-acetate-showing-improved-antibacterial-effect
#14
Yuwei Zhou, Ke Hu, Zhaobin Guo, Kun Fang, Xing Wang, Fang Yang, Ning Gu
In this study, composite antibacterial microcapsules combining of two antibacterial agents: chlorhexidine acetate and silver nanoparticle were prepared. The chlorhexidine acetate was encapsulated inside of the microcapsules and nano-sized silver particles were modified on the surface of microcapsules by electrostatic adsorption methods. Results show that this method decreases the silver usage dramatically, and promises a sustained antibacterial effect >30days. These microcapsules can also be modified on the surface of polymer films easily, which demonstrated the potential in functionalizing the implanted materials with antibacterial property...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530186/synthesis-and-characterisation-of-neem-leaf-extract-2-3-dehydrosalanol-and-quercetin-dihydrate-mediated-silver-nano-particles-for-therapeutic-applications
#15
Bodaballa Avinash, Ravipati Venu, Tollamadugu N V K V Prasad, Mekapogu Alpha Raj, Kothapalli Srinivasa Rao, Chintamaneni Srilatha
The utility of green silver nanoparticles (AgNPs) in veterinary medicine is steadily increasing as they have many therapeutic applications against pathogens and arthropods of livestock. In this study, green AgNPs using neem (N-AgNPs), 2,3-dehydrosalanol (2,3-DHS-AgNPs) and quercetin dihydrate (QDH-AgNPs) were synthesised and characterised. Synthesised compounds were characterised by UV-Vis spectroscopy and the peak absorbance was recorded at 370 nm for neem extract. For N-AgNPs, 2,3-DHS-AgNPs and QDH-AgNPs, the maximum absorbance peaks were at 430, 230 and 220 nm, respectively...
June 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28515938/accounting-for-adjuvant-induced-artifacts-in-the-characterization-of-vaccine-formulations-by-polyacrylamide-gel-electrophoresis
#16
Virginie Jakob, Livia Brunner, Christophe Barnier-Quer, Molly Blust, Nicolas Collin, Lauren Carter, Darrick Carter, Kelly M Rausch, Christopher B Fox
OBJECTIVES: Several vaccine adjuvants comprise complex nano- or micro-particle formulations, such as oil-in-water emulsions. In order to characterize interactions and compatibility of oil-in-water emulsion adjuvants with protein antigens in vaccines, effective protein characterization methods that can accommodate potential interference from high concentrations of lipid-based particles are needed. METHODS: Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) is a standard protein characterization technique which is affected by the presence of adjuvants such as oil-in-water emulsions...
April 2017: Therapeutic Advances in Vaccines
https://www.readbyqxmd.com/read/28494303/hemocompatibility-of-inhaled-environmental-nanoparticles-potential-use-of-in-vitro-testing
#17
REVIEW
Eleonore Fröhlich
Hemocompatibility testing is an important part in the evaluation of nano-based medicines. However, it is not systematically used for the assessment of environmental particles since they do not come in contact with blood immediately. Studies on human exposure to air-borne particles and pulmonary exposure of rodents have reported alterations in blood physiology. It is not clear, whether these effects are majorly caused by tissue inflammation or translocated particles in blood. This review addresses the question, if in vitro hemocompatibility testing could help in the risk evaluation of inhaled particles...
April 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28489347/measurement-of-the-density-of-engineered-silver-nanoparticles-using-centrifugal-fff-tem-and-single-particle-icp-ms
#18
Soheyl Tadjiki, Manuel David Montaño, Shoeleh Assemi, Angela Barber, James Ranville, Ronald Beckett
A methodology has been developed to measure nanoparticle mass and density, by combining centrifugal field-flow fractionation (CeFFF; more commonly called sedimentation FFF or SdFFF) and transmission electron microscopy (TEM). Particle effective mass obtained from CeFFF retention data and particle size obtained from the TEM images were used to calculate the nanoparticle density. The method was initially applied to measure the density of monodispersed polystyrene latex nanoparticles. Measured densities for latex nanoparticles of 160-300 nm in diameter were in the range of 1041-1063 kg m(-3) with standard deviations of 0...
June 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28463032/assessing-nanomaterial-exposures-in-aquatic-ecotoxicological-testing-framework-and-case-studies-based-on-dispersion-and-dissolution
#19
Alan J Kennedy, Jessica G Coleman, Stephen A Diamond, Nicolas L Melby, Anthony J Bednar, Ashley Harmon, Zachary A Collier, Robert Moser
The unique behavior of engineered nanomaterials (ENM) in aqueous media and dynamic changes in particle settling, agglomeration and dissolution rates is a challenge to the consistency, reliability and interpretation of standard aquatic hazard bioassay results. While the toxicological endpoints (e.g., survival, growth, reproduction, etc.) in ecotoxicity bioassays are largely applicable to ENMs, the standard methods as written for dissolved substances are confounded by the dynamic settling, agglomeration and dissolution of particulate ENMs during the bioassay...
May 2, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28462492/interaction-of-silver-and-gold-nanoparticles-in-mammalian-cancer-as-real-topical-bullet-for-wound-healing-a-comparative-study
#20
Allur Subramaniyan Sivakumar, Chandran Krishnaraj, Sunirmal Sheet, Dileep Reddy Rampa, Da Rae Kang, Shah Ahmed Belal, Abhay Kumar, In Ho Hwang, Soon-Il Yun, Yang Soo Lee, Kwan Seob Shim
The present study evaluates in vitro cytotoxic effects and the mode of interaction of biologically synthesized Ag and Au nanoparticles (NPs) using Brassica oleracea L. var. capitata f. rubra (BOL) against HT-1080 cancer cells and bacterial cells as well as their wound healing efficacy using a mouse model. UV-visible spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy, and energy-dispersive X-ray analysis have ascertained the formation of nano-sized Ag and Au particles...
August 2017: In Vitro Cellular & Developmental Biology. Animal
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