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https://www.readbyqxmd.com/read/28433942/synthesis-and-characterization-of-poly-propylene-imine-dendrimer-grafted-gold-nanoparticles-as-nanocarriers-of-doxorubicin
#1
Marzieh Golshan, Mehdi Salami-Kalajahi, Mina Mirshekarpour, Hossein Roghani-Mamaqani, Maryam Mohammadi
The aim of current work is synthesis 4th-generation-poly(propylene imine) (PPI)-dendrimer modified gold nanoparticles (Au-G4A) as nanocarriers for doxorubicin (DOX) and studying in vitro drug release kinetics from nanocarriers into different media. Accordingly, AuNPs were synthesized by reduction of chloroauric acid (HAuCl4) aqueous solution with trisodium citrate and modified with cysteamine to obtain amine-functionalized (Au-NH2) nanoparticles. Au-NH2 nanoparticles were used as multifunctional cores and participated in Michael addition of acrylonitrile and reduction process by lithium aluminum hydride (LAH) to synthesize Au-G4A nanoparticles...
April 13, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28413427/immunogenicity-and-safety-of-a-respiratory-syncytial-virus-fusion-protein-rsv-f-nanoparticle-vaccine-in-older-adults
#2
Louis Fries, Vivek Shinde, Jeffrey J Stoddard, D Nigel Thomas, Eloi Kpamegan, Hanxin Lu, Gale Smith, Somia P Hickman, Pedro Piedra, Gregory M Glenn
BACKGROUND: A preventative strategy for Respiratory Syncytial Virus (RSV) infection constitutes an under-recognized unmet medical need among older adults. Four formulations of a novel recombinant RSV F nanoparticle vaccine (60 or 90 μg RSV F protein, with or without aluminum phosphate adjuvant) administered concurrently with a licensed inactivated trivalent influenza vaccine (TIV) in older adult subjects were evaluated for safety and immunogenicity in this randomized, observer-blinded study...
2017: Immunity & Ageing: I & A
https://www.readbyqxmd.com/read/28375634/adsorption-of-oligo-dna-on-magnesium-aluminum-layered-double-hydroxide-nanoparticle-surfaces-mechanistic-implication-in-gene-delivery
#3
Kori A Andrea, Li Wang, Andrew J Carrier, Melanie Campbell, Margaret Buhariwalla, MacKenzi Mutch, Stephanie L MacQuarrie, Craig Bennett, Martin Mkandawire, Ken Oakes, Mingsheng Lu, Xu Zhang
Magnesium aluminum-layered double-hydroxide nanoparticles (LDH NPs) are promising drug-delivery vehicles for gene therapy, particularly for siRNA interference; however, the interactions between oligo-DNA and LDH surfaces have not been adequately elucidated. Through a mechanistic study, oligo-DNA initially appears to rapidly bind strongly to the LDH outer surfaces through interactions with their phosphate backbones via ligand exchange with OH(-) on Mg(2+) centers and electrostatic forces with Al(3+). These initial interactions might precede diffusion into interlayer spaces, and this knowledge can be used to design better gene therapy delivery systems...
April 10, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28337774/alumina-at-50-and-13%C3%A2-nm-nanoparticle-sizes-have-potential-genotoxicity
#4
Qinli Zhang, Haiyang Wang, Cuicui Ge, Jeremy Duncan, Kaihong He, Samuel O Adeosun, Huaxin Xi, Huiting Peng, Qiao Niu
Although nanomaterials have the potential to improve human life, their sideline effects on human health seem to be inevitable and still are unknown. Some studies have investigated the genotoxicity of alumina nanoparticles (AlNPs); however, this effect is still unclear due to insufficient evaluation and conflicting results. Using a battery of standard genotoxic assays, the present study offers evidence of the genotoxicity associated with aluminum oxide (alumina) at NP sizes of 50 and 13 nm, when compared with bulk alumina (10 μm)...
March 24, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28336900/improvement-of-scratch-and-wear-resistance-of-polymers-by-fillers-including-nanofillers
#5
Witold Brostow, Haley E Hagg Lobland, Nathalie Hnatchuk, Jose M Perez
Polymers have lower resistance to scratching and wear than metals. Liquid lubricants work well for metals but not for polymers nor for polymer-based composites (PBCs). We review approaches for improvement of tribological properties of polymers based on inclusion of fillers. The fillers can be metallic or ceramic-with obvious consequences for electrical resistivity of the composites. Distinctions between effectiveness of micro- versus nano-particles are analyzed. For example, aluminum nanoparticles as filler are more effective for property improvement than microparticles at the same overall volumetric concentration...
March 16, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28335345/electrostatic-self-assembly-of-diamond-nanoparticles-onto-al-and-n-polar-sputtered-aluminum-nitride-surfaces
#6
Taro Yoshikawa, Markus Reusch, Verena Zuerbig, Volker Cimalla, Kee-Han Lee, Magdalena Kurzyp, Jean-Charles Arnault, Christoph E Nebel, Oliver Ambacher, Vadim Lebedev
Electrostatic self-assembly of diamond nanoparticles (DNPs) onto substrate surfaces (so-called nanodiamond seeding) is a notable technique, enabling chemical vapor deposition (CVD) of nanocrystalline diamond thin films on non-diamond substrates. In this study, we examine this technique onto differently polarized (either Al- or N-polar) c-axis oriented sputtered aluminum nitride (AlN) film surfaces. This investigation shows that Al-polar films, as compared to N-polar ones, obtain DNPs with higher density and more homogeneously on their surfaces...
November 17, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335218/aggregation-and-colloidal-stability-of-commercially-available-al%C3%A2-o%C3%A2-nanoparticles-in-aqueous-environments
#7
Julie Mui, Jennifer Ngo, Bojeong Kim
The aggregation and colloidal stability of three, commercially-available, gamma-aluminum oxide nanoparticles (γ-Al₂O₃ NPs) (nominally 5, 10, and 20-30 nm) were systematically examined as a function of pH, ionic strength, humic acid (HA) or clay minerals (e.g., montmorillonite) concentration using dynamic light scattering and transmission electron microscopy techniques. NPs possess pH-dependent surface charges, with a point of zero charge (PZC) of pH 7.5 to 8. When pH < PZC, γ-Al₂O₃ NPs are colloidally stable up to 100 mM NaCl and 30 mM CaCl₂...
May 13, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28325038/benefit-of-rare-earth-smart-doping-and-material-nanostructuring-for-the-next-generation-of-er-doped-fibers
#8
Inna Savelii, Laurent Bigot, Bruno Capoen, Cedric Gonnet, Corinne Chanéac, Ekaterina Burova, Alain Pastouret, Hicham El-Hamzaoui, Mohamed Bouazaoui
Erbium-doped fiber amplifiers (EDFAs) for harsh environments require to develop specific fabrication methods of Er (3+)-doped fibers (EDFs) so as to limit the impact of radiation-induced absorption. In this context, a compromise has to be found between the concentration of Erbium and the glass composition. On the one hand, high concentration of Er (3+) ions helps to reduce the length of the EDF and hence the cumulated attenuation but generally leads to luminescence quenching mechanisms that limit the performances...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28319028/optically-active-charge-transfer-in-hybrids-of-alq3-nanoparticles-and-mos2-monolayer
#9
Ganesh Ghimire, Krishna P Dhakal, Guru P Neupane, Seong Gi Jo, Hyun Kim, Changwon Seo, Young Hee Lee, Jinsoo Joo, Jeongyong Kim
Organic/inorganic hybrid structures have been widely studied because of their enhanced physical and chemical properties. Monolayers of transition metal dichalcogenides (1L-TMDs) and organic nanoparticles can provide a hybridization configuration between zero- and two-dimensional systems with the advantages of convenient preparation and strong interface interaction. Here, we present such a hybrid system made by dispersing π-conjugated organic (tris (8-hydroxyquinoline) aluminum(III)) (Alq3) nanoparticles (NPs) on 1L-MoS2...
May 5, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28306264/correlating-carrier-density-and-emergent-plasmonic-features-in-cu2-xse-nanoparticles
#10
Lauren E Marbella, Xing Yee Gan, Derrick C Kaseman, Jill E Millstone
Recently, a wide variety of new nanoparticle compositions have been identified as potential plasmonic materials including earth-abundant metals such as aluminum, highly doped semiconductors, as well as metal pnictides. For semiconductor compositions, plasmonic properties may be tuned not only by nanoparticle size and shape, but also by charge carrier density which can be controlled via a variety of intrinsic and extrinsic doping strategies. Current methods to quantitatively determine charge carrier density primarily rely on interpretation of the nanoparticle extinction spectrum...
March 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28301725/optomechanics-of-single-aluminum-nanodisks
#11
Man-Nung Su, Pratiksha D Dongare, Debadi Chakraborty, Yue Zhang, Chongyue Yi, Fangfang Wen, Wei-Shun Chang, Peter Nordlander, John E Sader, Naomi J Halas, Stephan Link
Aluminum nanostructures support tunable surface plasmon resonances and have become an alternative to gold nanoparticles. Whereas gold is the most-studied plasmonic material, aluminum has the advantage of high earth abundance and hence low cost. In addition to understanding the size and shape tunability of the plasmon resonance, the fundamental relaxation processes in aluminum nanostructures after photoexcitation must be understood to take full advantage of applications such as photocatalysis and photodetection...
March 28, 2017: Nano Letters
https://www.readbyqxmd.com/read/28278132/formation-of-nitrile-species-on-ag-nanostructures-supported-on-a-al2o3-a-new-corrosion-route-for-silver-exposed-to-the-atmosphere
#12
R J Peláez, J P Espinós, C N Afonso
The aging of supported Ag nanostructures upon storage in ambient conditions (air and room temperature) for 20 months has been studied. The samples are produced on glass substrates by pulsed laser deposition (PLD); first a 15 nm thick buffer layer of amorphous aluminum oxide (a-Al2O3) is deposited, followed by PLD of Ag. The amount of deposited Ag ranges from that leading to a discontinuous layer up to an almost-percolated layer with a thickness of <6 nm. Some regions of the as-grown silver layers are converted, by laser induced dewetting, into round isolated nanoparticles (NPs) with diameters of up to ∼25 nm...
April 28, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28244724/the-role-of-field-electron-emission-in-polypropylene-aluminum-nanodielectrics-under-high-electric-fields
#13
Guoqiang Zhang, Yue Li, Saide Tang, Rhett D Thompson, Lei Zhu
Polymer/metallic particle nanocomposites or nanodielectrics can exhibit colossal dielectric constants with a relatively low dissipation factor under low electric fields and thus seem to be promising for high-energy density dielectric capacitors. To study this possibility, this work focused on the dielectric performance and loss mechanisms in polypropylene (PP)/aluminum nanoparticle (nAl NP) composites under high electric fields. Phosphonic acid-terminated poly(ethylene-co-1-butene) was grafted to the Al2O3 surface layer on the nAl NPs in order to achieve reasonable dispersion in the PP matrix...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28241622/enhancing-ultraviolet-spontaneous-emission-with-a-designed-quantum-vacuum
#14
Duncan McArthur, Benjamin Hourahine, Francesco Papoff
We determine how to alter the properties of the quantum vacuum at ultraviolet wavelengths to simultaneously enhance the spontaneous transition rates and the far field detection rate of quantum emitters. We find the response of several complex nanostructures in the 200 - 400 nm range, where many organic molecules have fluorescent responses, using an analytic decomposition of the electromagnetic response in terms of continuous spectra of plane waves and discrete sets of modes. Coupling a nanorod with an aluminum substrate gives decay rates up to 2...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28214677/photo-degradation-of-basic-green-1-and-basic-red-46-dyes-in-their-binary-solution-by-la2o3-al2o3nanocomposite-using-first-order-derivative-spectra-and-experimental-design-methodology
#15
Bahareh Fahimirad, Alireza Asghari, Maryam Rajabi
In this work, the lanthanum oxide-aluminum oxide (La2O3-Al2O3) nanocomposite is introduced as an efficient photocatalyst for the photo-degradation of the dyes basic green 1 (BG1) and basic red 46 (BR46) in their binary aqueous solution under the UV light irradiation. The properties of this catalyst are determined by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET), and UV-visible spectrophotometry. The first-order derivative spectra are used for the simultaneous analysis of the dyes in their binary solution...
February 10, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28181590/plasmonically-enhanced-metal-insulator-multistacked-photodetectors-with-separate-absorption-and-collection-junctions-for-near-infrared-applications
#16
Sina Abedini Dereshgi, Zulkarneyn Sisman, Kagan Topalli, Ali Kemal Okyay
Plasmonically enhanced metal-insulator-metal (MIM) type structures are popular among perfect absorbers and photodetectors in which the field enhancement (for increased absorption) mechanism is directly coupled with collection (photocurrent) processes. In this work we propose a device structure that decouples absorption and collection parts for independent optimization. Double-stacked MIM (i.e. MIMIM) photodetectors operating in the near-infrared (NIR) spectrum up to 1200 nm wavelength are demonstrated. In the absorbing MIM (at the top side), we have used Silver nanoparticles resulting from dewetting, yielding a very low reflection of 10% for the most part of the 400 to 1000 nm wavelength range...
February 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28161503/an-aluminum-selective-electrode-via-modification-of-pvc-membrane-by-modified-clinoptilolite-nanoparticles-with-hexadecyltrimethyl-ammonium-bromide-hdtma-br-surfactant-containing-arsenazo-iii
#17
Mostafa Mahdavi, Alireza Nezamzadeh-Ejhieh
A modified PVC (polyvinyl chloride) membrane with clinoptilolite nanoparticles/hexadecyltrimethyl ammonium bromide surfactant (HDTMABr)/Arsenazo III: (NSMZ-ARS), was used for construction of Al(III) -selective electrode. The raw and modified samples were characterized by XRD, FTIR, SEM and TEM methods. Among the different tested membranes constructed by raw and modified samples, only, the membrane electrode containing NSMZ-ARS showed a suitable Nernstian response to aluminum in the concentration range of 2...
May 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28124679/organic-bistable-memory-devices-based-on-moo3-nanoparticle-embedded-alq3-structures
#18
T Abhijith, T V Arun Kumar, V S Reddy
Organic bistable memory devices were fabricated by embedding a thin layer of molybdenum trioxide (MoO3) between two tris-(8-hydroxyquinoline)aluminum (Alq3) layers. The device exhibited excellent switching characteristics with an ON/OFF current ratio of 1.15 × 10(3) at a read voltage of 1 V. The device showed repeatable write-erase capability and good stability in both the conductance states. These conductance states are non-volatile in nature and can be obtained by applying appropriate voltage pulses. The effect of MoO3 layer thickness and its location in the Alq3 matrix on characteristics of the memory device was investigated...
January 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28120963/nanoparticle-nanoparticle-vs-nanoparticle-substrate-hot-spot-contributions-to-the-sers-signal-studying-raman-labelled-monomers-dimers-and-trimers
#19
Sergii Sergiienko, Kamila Moor, Kristina Gudun, Zarina Yelemessova, Rostislav Bukasov
We used a combination of Raman microscopy, AFM and TEM to quantify the influence of dimerization on the surface enhanced Raman spectroscopy (SERS) signal for gold and silver nanoparticles (NPs) modified with Raman reporters and situated on gold, silver, and aluminum films and a silicon wafer. The overall increases in the mean SERS enhancement factor (EF) upon dimerization (up by 43% on average) and trimerisation (up by 96% on average) of AuNPs and AgNPs on the studied metal films are within a factor of two, which is moderate when compared to most theoretical models...
January 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28119502/near-perfect-broadband-absorption-from-hyperbolic-metamaterial-nanoparticles
#20
Conor T Riley, Joseph S T Smalley, Jeffrey R J Brodie, Yeshaiahu Fainman, Donald J Sirbuly, Zhaowei Liu
Broadband absorbers are essential components of many light detection, energy harvesting, and camouflage schemes. Current designs are either bulky or use planar films that cause problems in cracking and delamination during flexing or heating. In addition, transferring planar materials to flexible, thin, or low-cost substrates poses a significant challenge. On the other hand, particle-based materials are highly flexible and can be transferred and assembled onto a more desirable substrate but have not shown high performance as an absorber in a standalone system...
February 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
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