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https://www.readbyqxmd.com/read/28094243/linear-and-ultrafast-nonlinear-plasmonics-of-single-nano-objects
#1
Aurelien Crut, Paolo Maioli, Fabrice Vallee, Natalia Del Fatti
Single-particle optical investigations have greatly improved our understanding of the fundamental properties of nano-objects, avoiding the spurious inhomogeneous effects that affect ensemble experiments. Correlation with high-resolution imaging techniques providing morphological information (e.g., electron microscopy) allows a quantitative interpretation of the optical measurements by means of analytical models and numerical simulations. In this topical review, we first briefly recall the principles underlying some of the most commonly used single-particle optical techniques: near-field, dark-field, spatial modulation and photothermal microscopies/spectroscopies...
January 17, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28094238/evaporating-metal-nanocrystal-arrays
#2
Xue Zhang, James Joy, Chenwei Zhao, Jin-Ho Kim, Gustavo Fernandes, Jimmy Xu, James Valles
Anodic aluminum oxide (AAO) substrates with a self-ordered triangular array of nanopores provide the means to fabricate multiple forms of nano materials, such as nanowires and nanoparticles. This study focuses on nanostructures that emerge in thin films of metals thermally evaporated onto the surface of AAO. Previous work showed that films of different evaporated metals assume dramatically different structures, e.g. an ordered triangular array of nearly monodisperse nanoparticles forms for Lead(Pb) while a polycrystalline nanohoneycomb structure forms for Silver(Ag)...
January 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28068855/iron-oxide-nanoparticles-in-modern-microbiology-and-biotechnology
#3
Ranmadugala Dinali, Alireza Ebrahiminezhad, Merilyn Manley-Harris, Younes Ghasemi, Aydin Berenjian
Iron oxide nanoparticles (IONs) are one of the most developed and used nanomaterials in biotechnology and microbiology. These particles have unique physicochemical properties, which make them unique among nanomaterials. Therefore, many experiments have been conducted to develop facile synthesis methods for these particles and to make them biocompatible. Various effects of IONs on microorganisms have been reported. Depending on the microbial strain and nanoparticle (NP) concentration, IONs can stimulate or inhibit microbial growth...
January 10, 2017: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/28043541/mixed-metal-oxide-nanoparticles-inhibit-growth-of-mycobacterium-tuberculosis-into-thp-1-cells
#4
A R Jafari, T Mosavi, N Mosavari, A Majid, F Movahedzade, M Tebyaniyan, M Kamalzadeh, M Dehgan, S Jafari, S Arastoo
OBJECTIVE/BACKGROUND: Humans have been in a constant battle with tuberculosis (TB). Currently, overuse of antibiotics has resulted in the spread of multidrug-resistant Mycobacterium tuberculosis (MDR), leading to antibiotic ineffectiveness at controlling the spread of TB infection in host cells and especially macrophages. Additionally, the Mycobacterium tuberculosis (Mtb) has developed methods to evade the immune system and survive. With the discovery of nanoparticle (NP)-based drugs, it is necessary to research their anti-mycobacterial properties and bactericidal mechanisms...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28024537/cmc-stabilized-nano-silver-synthesis-characterization-and-its-antibacterial-and-synergistic-effect-with-broad-spectrum-antibiotics
#5
P Prema, S Thangapandiyan, G Immanuel
In the present study silver nanoparticles were synthesized by reduction of AgNO3 using aqueous CMC solution, which acts as both reducing and capping agent. The formation of AgNO3 nanoparticles was observed visually by color change and these nanoparticles were characterized through UV-vis spectroscopy, FTIR, XRD, SEM, EDS and AFM. The FTIR peaks observed to be ranging from 3300 to 605cm(-1). The AFM image clearly showed the surface morphology of well dispersed nanoparticles. SEM image illustrates the nanoparticles with spherical shape...
February 20, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28017985/characterization-of-casein-and-casein-silver-conjugated-nanoparticle-containing-multifunctional-pectin-sodium-alginate-casein-bilayer-film
#6
Anupama Bora, Poonam Mishra
Casein nano particles and casein-silver conjugated nano composite containing edible bilayer pouch was developed from a heat sealable casein layer laminated with sodium alginate-pectin layer. The physicochemical, mechanical, biodegradability and the toxicity of the film were evaluated. The synthesized casein nano particle was incorporated in the casein layer (inner layer) of the film, however, the casein-silver conjugated nano composite were incorporated in the sodium alginate-pectin (outer) layer of the film...
October 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/27993735/it-takes-more-than-a-coating-to-get-nanoparticles-through-the-intestinal-barrier-in-vitro
#7
Dajana Lichtenstein, Johanna Ebmeyer, Thomas Meyer, Anne-Cathrin Behr, Claudia Kästner, Linda Böhmert, Sabine Juling, Birgit Niemann, Christoph Fahrenson, Sören Selve, Andreas F Thünemann, Jan Meijer, Irina Estrela-Lopis, Albert Braeuning, Alfonso Lampen
Size and shape are crucial parameters which have impact on the potential of nanoparticles to penetrate cell membranes and epithelial barriers. Current research in nanotoxicology additionally focuses on particle coating. To distinguish between core- and coating-related effects in nanoparticle uptake and translocation, two nanoparticles equal in size, coating and charge but different in core material were investigated. Silver and iron oxide nanoparticles coated with poly (acrylic acid) were chosen and extensively characterized by small-angle x-ray scattering, nanoparticle tracing analysis and transmission electron microscopy (TEM)...
December 18, 2016: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/27923138/metallogel-templated-synthesis-and-stabilization-of-silver-particles-and-its-application-in-catalytic-reduction-of-nitro-arene
#8
Mukesh Sharma, Plaban Jyoti Sarma, Manash Jyoti Goswami, Kusum K Bania
Metallogel of iron-carboxylates was obtained from trans-1,2-cyclohexanedicarboxylic acid in dimethylformamide (DMF) at basic condition. Spectroscopic and SEM morphology study of the iron-metallogel revealed that the iron complex with dicarboxylic acid was linked together via carboxylates and led to a supramolecular helical like architecture. The synthesized metallogel served as an excellent template for in-situ reduction of silver ion to silver particles micro to nano scale range. Variation of AgNO3 concentration shepherd to change the morphology of the Ag-particles...
November 20, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27918985/supporting-of-coupled-silver-halides-onto-clinoptilolite-nanoparticles-as-simple-method-for-increasing-their-photocatalytic-activity-in-heterogeneous-photodegradation-of-mixture-of-4-methoxy-aniline-and-4-chloro-3-nitro-aniline
#9
Sajad Jafari, Alireza Nezamzadeh-Ejhieh
Novel photocatalyts were synthesized by dispersion of AgX (X=I, Br, Cl) in nano clinoptilolite particles (NCP). The obtained composites (AgX-NCP) were used for the photodegrading of aqueous mixture of 4-methoxy aniline and 4-chloro-3-nitroaniline under Hg lamp irradiation. All samples were characterized by FT-IR, XRD, DRS and TEM. The effects of operational parameters such as: the loaded extent of AgX, the amount of photocatalyst, initial pH and concentration on photo mineralization were studied. The degradation extent was monitored by UV-Vis spectroscopy and the results were confirmed by the chemical oxygen demand (COD)...
March 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27906139/myxobacteria-mediated-synthesis-of-silver-nanoparticles-and-their-impregnation-in-wrapping-paper-used-for-enhancing-shelf-life-of-apples
#10
Swati Bhople, Swapnil Gaikwad, Swapna Deshmukh, Shital Bonde, Aniket Gade, Sanjib Sen, Anna Brezinska, Hanna Dahm, Mahendra Rai
The authors report Myxobacteria virescens (M. virescens) mediated synthesis of silver nanoparticles (AgNPs) and its efficacy against Staphylococcus aureus (ATCC-33591), Salmonella typhi (ATCC-51812), Escherichia coli (E. coli) (ATCC-14948), Klebsiella pneumoniae (MTCC-4030) and Pseudomonas aeruginosa (MTCC-4673). The organism exhibiting resistance to various antibiotics showed remarkable sensitivity, when used in combination of antibiotics and AgNPs. Antimicrobial property of AgNPs is playing a significant role in medicine and food storage...
December 2016: IET Nanobiotechnology
https://www.readbyqxmd.com/read/27905322/synergistic-interactions-between-silver-decorated-graphene-and-carbon-nanotubes-yield-flexible-composites-to-attenuate-electromagnetic-radiation
#11
Shital Patangrao Pawar, Sachin Kumar, Shubham Jain, Mounika Gandi, Kaushik Chatterjee, Suryasarathi Bose
The need of today's highly integrated electronic devices, especially working in the GHz frequencies, is to protect them from unwanted interference from neighbouring devices. Hence, lightweight, flexible, easy to process microwave absorbers were designed here by dispersing conductive multiwall carbon nanotubes (MWNTs) and silver nanoparticles decorated onto two-dimensional graphene sheets (rGO@Ag) in poly(ε-caprolactone) (PCL). In this study, we have shown how dielectric losses can be tuned in the nanocomposites by rGO@Ag nano-hybrid; an essential criterion for energy dissipation within a material resulting in effective shielding of the incoming electromagnetic (EM) radiation...
January 13, 2017: Nanotechnology
https://www.readbyqxmd.com/read/27892872/fern-synthesized-silver-nanocrystals-towards-a-new-class-of-mosquito-oviposition-deterrents
#12
Rajapandian Rajaganesh, Kadarkarai Murugan, Chellasamy Panneerselvam, Sudalaimani Jayashanthini, Al Thbiani Aziz, Mathath Roni, Udaiyan Suresh, Subrata Trivedi, Hasibur Rehman, Akon Higuchi, Marcello Nicoletti, Giovanni Benelli
Mosquitoes act as vectors of devastating pathogens and parasites, representing a key threat for millions of humans and animals worldwide. Eco-friendly control tools are urgently required. We proposed a novel method of fern-mediated biosynthesis of silver nanoparticles (AgNP) using Dicranopteris linearis, acting as a reducing and capping agent. AgNP were characterized by UV-vis spectroscopy, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), zeta potential and particle size analysis...
December 2016: Research in Veterinary Science
https://www.readbyqxmd.com/read/27866607/synthesis-of-silver-nanoparticles-by-endosymbiont-pseudomonas-fluorescens-ca-417-and-their-bactericidal-activity
#13
Baker Syed, Nagendra Prasad M N, Dhananjaya B L, Mohan Kumar K, Yallappa S, Satish S
The present study emphasizes on biogenic synthesis of silver nanoparticles and their bactericidal activity against human and phytopathogens. Nanoparticle synthesis was performed using endosymbiont Pseudomonas fluorescens CA 417 inhabiting Coffea arabica L. Synthesized nanoparticles were characterized using hyphenated spectroscopic techniques such as UV-vis spectroscopy which revealed maximum absorption 425nm. Fourier transform infrared spectroscopy (FTIR) analysis revealed the possible functional groups mediating and stabilizing silver nanoparticles with predominant peaks occurring at 3346 corresponding to hydroxyl group, 1635 corresponding carbonyl group and 680 to aromatic group...
December 2016: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/27828211/probing-the-acoustic-vibrations-of-complex-shaped-metal-nanoparticles-with-four-wave-mixing
#14
Jian Wu, Dao Xiang, Ghazal Hajisalem, Fan-Cheng Lin, Jer-Shing Huang, Chun-Hong Kuo, Reuven Gordon
We probe the acoustic vibrations of silver nanoprisms and gold nano-octahedrons in aqueous solution with four-wave mixing. The nonlinear optical response shows two acoustic vibrational modes: an in-plane mode of nanoprisms with vertexial expansion and contraction; an extensional mode of nano-octahedrons with longitudinal expansion and transverse contraction. The particles were also analyzed with electron microscopy and the acoustic resonance frequencies were then calculated by the finite element analysis, showing good agreement with experimental observations...
October 17, 2016: Optics Express
https://www.readbyqxmd.com/read/27784221/bio-fabrication-of-silver-nanoparticle-from-argemone-mexicana-for-the-control-of-aedes-albopictus-and-their-antimicrobial-activity
#15
Siva Kamalakannan, Sivapunyam Ananth, Kadarkarai Murugan, Kalimuthu Kovendan, Marimuthu Ramar, Ponnan Arumugam, Balamurugan Chandramohan, Vellingiri Balachandar
BACKGROUND: Plant synthesized silver nanoparticles give rapid control on mosquito larvae of dengue vector, Aedes albopictus. AgNPs synthesized from the plant, Argemone mexicana for the control of larvae and these nanoparticles inhibit the growth of microbes are broad spectrum of nanoparticle activities. METHODS: Nanoparticles were subjected to analysis by UV-vis spectrophotometry, Fourier transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy...
2016: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/27782245/particle-size-independent-induction-of-leucism-in-drosophila-melanogaster-by-silver-nano-vs-micro
#16
Kanchan A Phatak, Pawan K Khanna, Bimalendu B Nath
With the discovery of nanoscience, silver nanoparticles (AgNPs) now appear on the ingredient lists of commercial products along with bulk silver or silver microparticles (AgMPs). In the present study, we have compared the effects of silver in both nano and micro forms to assess whether particle size plays a role in the pigmentation pathway, using Drosophila melanogaster as a model organism. AgNPs were synthesized, characterized and validated. Internalization of the AgNPs and AgMPs was confirmed by atomic absorption spectroscopy...
December 7, 2016: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/27765092/-acute-toxicity-and-bio-distribution-of-silver-nitrate-and-nano-silver-with-different-particle-diameters-in-rats
#17
T Z Li, F Gong, B Y Zhang, J D Sun, T Zhang, L Kong, Y Y Xue, M Tang
Objective: To explore the acute toxic effect and the cumulative target organ of silver nitrate and nano-silver with two different particle diameters in rats. Methods: Thirty-six adult SD rats were divided into small particle size nano-silver group (SNS), large particle size nano-silver group (LNS), silver nitrate group (SN), and control group (C) according to the random number table, with 9 rats in each group. The rats of the four groups were respectively injected with 10 mg/mL nano-silver solution (particle diameter of 20 nm, prepared by saline) in silver dose of 30 mg/kg by tail vein for once, 10 mg/mL nano-silver solution (particle diameter of 100 nm, prepared by saline) in silver dose of 30 mg/kg, 1...
October 20, 2016: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/27756476/sedimentation-field-flow-fractionation-and-optical-absorption-spectroscopy-for-a-quantitative-size-characterization-of-silver-nanoparticles
#18
Catia Contado, Roberto Argazzi, Vincenzo Amendola
Many advanced industrial and biomedical applications that use silver nanoparticles (AgNPs), require that particles are not only nano-sized, but also well dispersed, not aggregated and not agglomerated. This study presents two methods able to give rapidly sizes of monodispersed AgNPs suspensions in the dimensional range of 20-100nm. The first method, based on the application of Mie's theory, determines the particle sizes from the values of the surface plasmon resonance wavelength (SPRMAX), read from the optical absorption spectra, recorded between 190nm and 800nm...
November 4, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27744152/silver-nanoparticles-in-the-environment-sources-detection-and-ecotoxicology
#19
REVIEW
E McGillicuddy, I Murray, S Kavanagh, L Morrison, A Fogarty, M Cormican, P Dockery, M Prendergast, N Rowan, D Morris
The environmental impact of silver nanoparticles (AgNP) has become a topic of interest recently, this is due to the fact that AgNPs have been included in numerous consumer products including textiles, medical products, domestic appliances, food containers, cosmetics, paints and nano-functionalised plastics. The production, use and disposal of these AgNP containing products are potential routes for environmental exposure. These concerns have led to a number of studies investigating the release of particles from nano-functionalised products, the detection of the particles in the aquatic environment and the potential environmental toxicology of these AgNPs to aquatic organisms...
January 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27740849/mucus-and-microbiota-as-emerging-players-in-gut-nanotoxicology-the-example-of-dietary-silver-and-titanium-dioxide-nanoparticles
#20
Muriel Mercier-Bonin, Bernard Despax, Patrice Raynaud, Eric Houdeau, Muriel Thomas
Given the growing use of nanotechnology in many common consumer products, including foods, evaluation of the consequences of chronic exposure to nanoparticles in humans has become a major public health issue. The oral route of exposure has been poorly explored, despite the presence of a fraction of nano-sized particles in certain food additives/supplements and the incorporation of such particles into packaging in contact with foods. After their ingestion, these nanoparticles pass through the digestive tract, where they may undergo physicochemical transformations, with consequences for the luminal environment, before crossing the epithelial barrier to reach the systemic compartment...
October 14, 2016: Critical Reviews in Food Science and Nutrition
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