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https://www.readbyqxmd.com/read/29231881/the-effect-of-different-coupling-agents-on-nano-zno-materials-obtained-via-the-sol-gel-process
#1
Violeta Purcar, Raluca Şomoghi, Sabina Georgiana Niţu, Cristian-Andi Nicolae, Elvira Alexandrescu, Ioana Cătălina Gîfu, Augusta Raluca Gabor, Hermine Stroescu, Raluca Ianchiş, Simona Căprărescu, Ludmila Otilia Cinteză
Hybrid nanomaterials based on zinc oxide were synthesized via the sol-gel method, using different silane coupling agents: (3-glycidyloxypropyl)trimethoxysilane (GPTMS), phenyltriethoxysilane (PhTES), octyltriethoxysilane (OTES), and octadecyltriethoxysilane (ODTES). Morphological properties and the silane precursor type effect on the particle size were investigated using dynamic light scattering (DLS), environmental scanning electron microscopy (ESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and X-ray diffraction (XRD)...
December 12, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29214249/shapes-matter-examining-the-optical-response-evolution-in-stretched-aluminium-nanoparticles-via-time-dependent-density-functional-theory
#2
Junais Habeeb Mokkath
Using first-principles time-dependent density functional theory calculations, we investigate the shape-anisotropy effects on the optical response of a spherical aluminium nanoparticle subjected to a stretching process in different directions. Progressively increased stretching in one direction resulted in prolate spheroid (nanorice) geometries and produced a couple of well-distinguishable dominant peaks together with some satellite peaks in the UV-visible region of the electromagnetic spectrum. On the other hand, progressively increased stretching in two directions caused multiple peaks to appear in the UV-visible region of the electromagnetic spectrum...
December 7, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29210564/in-situ-characterization-of-photothermal-nanoenergetic-combustion-on-a-plasmonic-microchip
#3
Biyan Chen, Haisheng Zheng, Matthew Riehn, Sangho Bok, Keshab Gangopadhyay, Matthew R Maschmann, Shubhra Gangopadhyay
Plasmonic gratings facilitate a robust in-situ diagnostic platform for photothermal combustion of nanoenergetic composite thin films using an optical microscope and high-speed camera. Aluminum nanoparticles (Al NPs) embedded in THV fluoropolymer oxidizer are cast onto a plasmonic grating microchip and ignited using a low-power laser. The plasmonic grating enhances both spatial resolution and sufficient photothermal coupling to combust small Al NP clusters, initiating localized flames as small as 600 nm in size...
December 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29171990/development-of-nanoparticle-adjuvants-to-potentiate-the-immune-response-against-diphtheria-toxoid
#4
Fatimah M Alshanqiti, Saad Berki Al-Masaudi, Ahmed M Al-Hejin, Nawal Abd El-Baky, Elrashdy M Redwan
BACKGROUND: Over the years, diphtheria was known as contagious fatal infection caused by Corynebacterium diphtheria that affects upper respiratory system. The spread of diphtheria epidemic disease is best prevented by vaccination with diphtheria toxoid vaccine. Aluminum adjuvants were reported to stimulate the immune responses to killed and subunit vaccines. OBJECTIVE: Our study aimed to minimize adjuvant particles size, to gain insight of resulting immunity titer and impact on immune response antibody subtypes...
June 30, 2017: Human Antibodies
https://www.readbyqxmd.com/read/29168566/comparison-of-subchronic-immunotoxicity-of-four-different-types-of-aluminum-based-nanoparticles
#5
Eun-Jung Park, Sang Jin Lee, Gwang-Hee Lee, Dong-Wan Kim, Cheolho Yoon, Byoung-Seok Lee, Younghun Kim, Jaerak Chang, Kyuhong Lee
Nanoparticles (NPs) have recently emerged as an inhalable pollutant, owing to their applications, aluminum-based NPs (Al-NPs) have been prioritized for toxicity testing. In the current study, we compared the pulmonary biopersistence and subsequent toxicity of four different types of Al-NPs (two rod-type aluminum oxide NPs [AlONPs] with different aspect ratios [short (S)- and long (L)-AlONPs], spherical aluminum cerium oxide NPs [AlCeO3 , AlCeONPs] and spherical γ-aluminum oxide hydroxide nanoparticles [AlOOHNPs]) 13weeks after a single intratracheal instillation, considering the importance of their properties in their toxicity...
November 23, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/29160771/synthesis-of-oxide-free-aluminum-nanoparticles-for-application-to-conductive-film
#6
Yung Jong Lee, Changsoo Lee, Hyuck Mo Lee
Aluminum nanoparticles are considered promising as alternatives to conventional ink materials, replacing silver and copper nanoparticles due to their extremely low cost and low melting temperature. However, a serious obstacle to realizing their use as conductive ink materials is the oxidation of aluminum. In this research, we synthesized the oxide-free aluminum nanoparticles using catalytic decomposition and an oleic acid coating method, and these materials were applied to the conductive ink for the first time...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29144303/zero-valent-aluminum-mediated-degradation-of-bisphenol-a-in-the-presence-of-common-oxidants
#7
I Arslan-Alaton, T Olmez-Hanci, M Dogan, T Ozturk
The use of a commercial, nano-scale zero-valent aluminum (ZVA) powder was explored for the treatment of aqueous Bisphenol A (BPA). The study focused on the (i) activation of hydrogen peroxide (HP) and persulfate (PS) oxidants with ZVA to accelerate BPA degradation, (ii) comparison of the treatment performance in pure and real surface water (SW) samples, (iii) effects on toxicity and (iv) reuse potential of ZVA nanoparticles after ZVA/HP and ZVA/PS treatments. In pure water, ZVA coupled with HP or PS provided an effective means of BPA treatment particularly when PS was employed as the oxidant...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29095144/a-flexible-pressure-responsive-device-based-on-the-interaction-between-silver-nanoparticles-and-an-aluminum-reflector
#8
Alasdair Rankin, Steven P McGarry
The unique and tunable optical properties of metal nanoparticles has attracted intense and sustained academic attention in recent years. In tandem with the demand for low-cost responsive materials, one particular topic of interest is the development of mechanically responsive device structures. This work describes the design, fabrication, and testing of a mechanically responsive plasmonic device structure that has been integrated onto a standard commercial plastic substrate. With a low actuation force and a visually perceivable color shift, this device would be attractive for applications requiring responsive features that can be activated by the human hand...
November 2, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29094925/topologically-enclosed-aluminum-voids-as-plasmonic-nanostructures
#9
Ye Zhu, Philip N H Nakashima, Alison M Funston, Laure Bourgeois, Joanne Etheridge
Recent advances in the ability to synthesize metallic nanoparticles with tailored geometries have led to a revolution in the field of plasmonics. However, studies of the important complementary system, an inverted nanostructure, have so far been limited to two-dimensional sphere-segment voids or holes. Here we reveal the localized surface plasmon resonances (LSPRs) of nanovoids that are topologically enclosed in three-dimensions: an "anti-nanoparticle". We combine this topology with the favorable plasmonic properties of aluminum to observe strongly localized field enhancements with LSPR energies in the extreme UV range, well beyond those accessible with noble metals or yet achieved with aluminum...
November 2, 2017: ACS Nano
https://www.readbyqxmd.com/read/29079739/gap-enhanced-fluorescence-as-a-road-map-for-the-detection-of-very-weakly-fluorescent-emitters-from-visible-to-ultraviolet
#10
Duncan McArthur, Francesco Papoff
We analyze the enhancement of the rates of both the emission and the far field radiation for dipoles placed in the gap between a metallic nanorod, or nanosphere, and a metallic substrate. For wavelengths between 150 nm and 650 nm, the response of the gapped nanostructures considered in this work is dominated by few principal modes of the nanoparticle, which include self-consistently the effect of the substrate. For wavelengths shorter than 370 nm, the far field radiative enhancements of aluminum nanostructures are significantly higher than those for gold or silver...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29074358/inhibitory-effect-of-silver-nanoparticles-on-proliferation-of-estrogen-dependent-mcf-7-bus-human-breast-cancer-cells-induced-by-butyl-paraben-or-di-n-butyl-phthalate
#11
Joanna Roszak, Anna Smok-Pieniążek, Katarzyna Domeradzka-Gajda, Jarosław Grobelny, Emilia Tomaszewska, Katarzyna Ranoszek-Soliwoda, Grzegorz Celichowski, Maciej Stępnik
In this study the effect of silver nanoparticles (AgNPs) on proliferation of estrogen receptor (ER)-positive human breast cancer MCF-7/BUS cells was assessed by means of in vitro assay. The cells were exposed in the absence of estrogens to AgNPs alone or in combination with aluminum chloride (AlCl3), butyl paraben (BPB) and di-n-butyl phthalate (DBPh). The results revealed that AgNPs at the non-cytotoxic concentrations (up to 2μg/mL) and AlCl3 (up to 500μM) did not induce proliferation of MCF-7/BUS cells whereas BPB and DBPh showed strong estrogenic activity with the highest effect at 16μM and 35μM, respectively...
December 15, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29069632/investigation-on-effect-of-basalin-coated-silver-nanoparticles-as-antioxidant-for-alleviating-peripheral-neuropathy-in-mice-treated-with-oxaliplatin
#12
Lei Gao, Yumei Zheng, Chengbo Zhao, Hongtao Teng
A facile, convenient, and green method for the synthesis of BAgNPs by using basalin is proposed in this work. The capping of the basalin on the surface of BAgNP was confirmed by the zeta potential and FTIR findings. Further, we have injected prepared BAgNPs into oxaliplatin-treated mice to alleviate neuropathic pain. The aluminum levels in the DRG were reduced by the chelating activity of BAgNPs. Moreover, behavioral analyses also manifested that the accumulation of aluminum on the DRG might be a reason for neuropathic hyperalgesia...
October 2, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29053580/study-of-the-photodynamic-activity-of-n-doped-tio%C3%A2-nanoparticles-conjugated-with-aluminum-phthalocyanine
#13
Xiaobo Pan, Xinyue Liang, Longfang Yao, Xinyi Wang, Yueyue Jing, Jiong Ma, Yiyan Fei, Li Chen, Lan Mi
TiO₂ nanoparticles modified with phthalocyanines (Pc) have been proven to be a potential photosensitizer in the application of photodynamic therapy (PDT). However, the generation of reactive oxygen species (ROS) by TiO₂ nanoparticles modified with Pc has not been demonstrated clearly. In this study, nitrogen-doped TiO₂ conjugated with Pc (N-TiO₂-Pc) were studied by means of monitoring the generation of ROS. The absorbance and photokilling effect on HeLa cells upon visible light of different regions were also studied and compared with non-doped TiO₂-Pc and Pc...
October 20, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29047607/aluminum-oxide-nanoparticles-as-saturable-absorber-for-c-band-passively-q-switched-fiber-laser
#14
Sarah Kadhim Mohsin Al-Hayali, Dunya Zeki Mohammed, Wurood Abdulkhaleq Khaleel, Abdul Hadi Al-Janabi
We report on aluminum oxide nanoparticles (Al2O3 NPs) as a saturable absorber (SA) for passively Q-switched erbium-doped fiber laser (EDFL) operating at a wavelength of 1560.6 nm within the C-band region. A thin film of Al2O3-SA was prepared using polyvinyl alcohol (PVA) as a host polymer. Very stable pulses with a 57.8 KHz repetition rate and 5.6 μs pulse width at a threshold pump power of 158 mW were obtained. A 2.8 μs pulse width, 81 kHz pulse repetition rate, with maximum pulse energy of 56.7 nJ at a diode pump power of 330 mW were recorded...
June 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29019367/one-pot-organometallic-synthesis-of-alumina-embedded-pd-nanoparticles
#15
Natália J S Costa, Lucas L R Vono, Robert Wojcieszak, Érico Teixiera-Neto, Karine Philippot, Liane M Rossi
Herein we report a one pot organometallic strategy to access alumina-embedded Pd nanoparticles. Unexpectedly, the decomposition of the organometallic complex tris(dibenzylideneacetone)dipalladium(0), Pd2(dba)3, by dihydrogen in the presence of aluminum isopropoxide, Al(iPrO)3, and without extra stabilizers, was found to be an efficient method to generate a Pd colloidal solution. Careful characterization studies revealed that the so-obtained Pd nanoparticles were stabilized by an aluminum isopropoxide tetramer and 1,5-diphenyl-pentan-3-one, which was produced after reduction of the dba ligand from the organometallic precursor...
October 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28991959/a-novel-explanation-for-the-increased-conductivity-in-annealed-al-doped-zno-an-insight-into-migration-of-aluminum-and-displacement-of-zinc
#16
A Momot, M N Amini, G Reekmans, D Lamoen, B Partoens, D R Slocombe, K Elen, P Adriaensens, A Hardy, M K Van Bael
A combined experimental and first-principles study is performed to study the origin of conductivity in ZnO:Al nanoparticles synthesized under controlled conditions via a reflux route using benzylamine as a solvent. The experimental characterization of the samples by Raman, nuclear magnetic resonance (NMR) and conductivity measurements indicates that upon annealing in nitrogen, the Al atoms at interstitial positions migrate to the substitutional positions, creating at the same time Zn interstitials. We provide evidence for the fact that the formed complex of AlZn and Zni corresponds to the origin of the Knight shifted peak (KS) we observe in (27)Al NMR...
October 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28976516/a-self-healable-and-tough-nanocomposite-hydrogel-crosslinked-by-novel-ultrasmall-aluminum-hydroxide-nanoparticles
#17
Haoyang Jiang, Gongzheng Zhang, Feibo Li, Yaqian Zhang, Yu Lei, Yanhong Xia, Xianghu Jin, Xianqi Feng, Huanjun Li
Self-healing hydrogels like tissues or organs which are repaired automatically in response to damage show great promise. However, it remains a challenge to develop novel functional nanoparticles as crosslinkers to prepare tough and self-healing nanocomposite hydrogels. Here, we report the preparation of water-soluble ultrasmall aluminum hydroxide nanoparticles with a diameter of 2-3 nm through a simple sol-gel method. Furthermore, a tough nanocomposite hydrogel is prepared by the in situ copolymerization of acylamide and 2-acrylamido-2-methyl propane sulfonic acid in the presence of aluminum hydroxide nanoparticles...
October 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28970541/engineered-optical-properties-of-silver-aluminum-alloy-nanoparticles-embedded-in-sion-matrix-for-maximizing-light-confinement-in-plasmonic-silicon-solar-cells
#18
Piyush K Parashar, Vamsi K Komarala
Self-assembled silver-aluminum (Ag-Al) alloy nanoparticles (NPs) embedded in SiO2, Si3N4, and SiON dielectric thin film matrices explored as a hybrid plasmonic structure for silicon solar cells to maximize light confinement. The Ag2Al NPs prepared by ex-vacuo solid-state dewetting, and alloy formation confirmed by X-ray diffraction and photoelectron spectroscopy analysis. Nanoindentation by atomic force microscopy revealed better surface adhesion of alloy NPs on silicon surface than Ag NPs due to the Al presence...
October 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28960992/dna-grafting-and-arrangement-on-oxide-surfaces-for-self-assembly-of-al-and-cuo-nanoparticles
#19
Théo Calais, David Bourrier, Aurélien Bancaud, Yves Chabal, Alain Estève, Carole Rossi
DNA-directed assembly of nano-objects as a means to manufacture advanced nanomaterial architectures has been the subject of many studies. However, most applications have dealt with noble metals as there are fundamental difficulties to work with other materials. In this work, we propose a generic and systematic approach for functionalizing and characterizing oxide surfaces with single-stranded DNA oligonucleotides. This protocol is applied to aluminum and copper oxide nanoparticles due to their great interest for the fabrication of highly energetic heterogeneous nanocomposites...
October 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28953243/effect-of-zirconia-nanoparticles-in-epoxy-silica-hybrid-adhesives-to-join-aluminum-substrates
#20
José de Jesús Figueroa-Lara, Miguel Torres-Rodríguez, Mirella Gutiérrez-Arzaluz, Mario Romero-Romo
This research presents the interaction of the epoxy polymer diglicydil ether of bisphenol-A (DGEBA) with silica (SiO₂) nanoparticles plus zirconia (ZrO₂) nanoparticles obtained via the sol-gel method in the synthesis of an epoxy-silica-zirconia hybrid adhesive cured with polyamide. ZrO₂ nanoparticles were added to the epoxy-silica hybrid adhesive produced in situ to modify the apparent shear strength of two adhesively bonded aluminum specimens. The results showed that the addition of different amounts of ZrO₂ nanoparticles increased the shear strength of the adhesively bonded aluminum joint, previously treated by sandblasting, immersion in hot water and silanized with a solution of hydrolyzed 3-glycidoxipropyltrimethoxysilane (GPTMS)...
September 27, 2017: Materials
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