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https://www.readbyqxmd.com/read/27773236/ultrasound-irradiation-effect-on-morphology-and-size-of-two-new-potassium-coordination-supramolecule-compounds
#1
Payam Hayati, Ali Reza Rezvani, Ali Morsali, Pascal Retailleau
Two new potassium coordination supramolecular compounds (2D and 1D), [K(H3L)(H2L)(H2O)]n·H2O (1) and [K(H2L')(HL')(H2O)2]·H2O (2), (L=1,3,5-tricarboxylic acid, L'=2,6-pyridinedicarboxylic acid), have been synthesized under different experimental conditions. Micrometric crystals (bulk) or nano-sized materials have been obtained depending on using the branch tube method or sonochemical irradiation. All materials have been characterized by field emission scanning electron microscopy (FE-SEM), scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), FT-IR spectroscopy and elemental analyses...
January 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27756523/sonochemical-synthesis-of-nano-lead-ii-metal-organic-coordination-polymer-new-precursor-for-the-preparation-of-nano-materials
#2
Babak Mirtamizdoust
Nano-sheets of a novel Pb(II)-based 3D metal-organic coordination polymer [Pb2(nih)2(NO3)4(CH3OH)]n (1) were synthesized by a branched-tube method and sonochemical reaction. The synthesis was done using various times, concentrations of initial reagents, and irradiation power. The compound was characterized by scanning electron microscopy (SEM), elemental analysis, IR spectroscopy, thermogravimetric analysis (TGA), differential thermal analysis (DTA), X-ray powder diffraction (XRD), and single-crystal X-ray analysis...
March 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27713526/no-gas-sensing-kinetics-at-room-temperature-under-uv-light-irradiation-of-in2o3-nanostructures
#3
Nguyen Duc Chinh, Nguyen Duc Quang, Hyundong Lee, Truong Thi Hien, Nguyen Minh Hieu, Dahye Kim, Chunjoong Kim, Dojin Kim
In2O3 nanostructure sensors were fabricated by arc-discharging a source composed of a graphite tube containing indium. The NO gas sensing properties, as well as the morphology, structure, and electrical properties, were examined at room temperature under UV light illumination. In particular, the response and recovery kinetics of the sensor at room temperature under various UV light intensities were studied. The maximum response signal was observed at an intermediate UV light intensity, which could be corroborated by a nano-size effect based on the conduction model of a resistive chemical nano sensor...
October 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27704855/electrostatically-driven-nanoballoon-actuator
#4
Hamid Reza Barzegar, Aiming Yan, Sinisa Coh, Eduardo Gracia-Espino, Gabriel Dunn, Thomas Wagberg, Steven G Louie, Marvin L Cohen, Alex Zettl
We demonstrate an inflatable nanoballoon actuator by geometrical transition between inflated (cylindrical) and collapsed (flattened) forms of a carbon nanotube. In-situ transmission electron microscopy experiments, employing a nano-electromechanical manipulator, show that a collapsed carbon nanotube can be re-inflated by electrically charging the nanotube thus realizing an electrostatically driven nanoballoon actuator. We find that the tube actuator can be reliably cycled with only modest control voltages (few volts) with no apparent wear or fatigue...
October 5, 2016: Nano Letters
https://www.readbyqxmd.com/read/27648681/new-doxorubicin-nanoparticles-engineered-from-calcium-crosslinked-carbomer-and-a-microemulsion-precursor
#5
Amnon C Sintov, Giora Enden
The purpose of this study was to investigate a new polymeric system and production process in which self-assembled doxorubicin-loaded nanoparticles were synthetized by using a water-in-oil microemulsion as a template and calcium ions as cross-linkers. The manufacturing process combined cross-linking of carbomer within a W/O microemulsion followed by a phase-separation technique to avoid using organic solvents for extraction. To assess the sustained release behavior of doxorubicin from the nanoparticles, we have developed a new simple method based on the permeability coefficient of a synthetic membrane mounted on Franz diffusion cell system...
October 6, 2016: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/27572419/investigation-of-the-effects-of-using-single-wall-carbon-nanotubes-swcnts-in-ozone-measurement-with-passive-samplers
#6
A Akdemir
UNLABELLED: Passive samplers are used in air quality monitoring for many years to compete in terms of being economical with continuous measurement systems. In this study, different amounts of single-wall carbon nanotubes (SWCNTs) were added in the impregnation solution of the filters of passive samplers and the effect on the absorption of ozone studied. The results of the measurement of ozone with varying amounts of SWCNTs added to the impregnation solution of the filters of the passive samplers were compared with the results of the continuous ozone measurement system (CS)...
October 2016: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/27536326/shear-bond-strength-of-a-resin-cement-to-different-alloys-subjected-to-various-surface-treatments
#7
Fariba Ezoji, Kasra Tabari, Zahra Jaberi Ansari, Hassan Torabzadeh, Mohammad Javad Kharrazi Fard
OBJECTIVES: Micromechanical retention of resin cements to alloys is an important factor affecting the longevity of metal base restorations. This study aimed to compare the bond strength and etching pattern of a newly introduced experimental etchant gel namely Nano Met Etch with those of conventional surface treatment techniques for nickel-chrome (Ni-Cr) and high noble alloys. MATERIALS AND METHODS: A total of 120 discs (8×10×15 mm) were cast with Ni-Cr (n=20), high noble BegoStar (n=50) and gold coin alloys (n=50)...
January 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/27524076/hydrothermally-processed-1d-hydroxyapatite-mechanism-of-formation-and-biocompatibility-studies
#8
Zoran S Stojanović, Nenad Ignjatović, Victoria Wu, Vojka Žunič, Ljiljana Veselinović, Srečo Škapin, Miroslav Miljković, Vuk Uskoković, Dragan Uskoković
Recent developments in bone tissue engineering have led to an increased interest in one-dimensional (1D) hydroxyapatite (HA) nano- and micro-structures such as wires, ribbons and tubes. They have been proposed for use as cell substrates, reinforcing phases in composites and carriers for biologically active substances. Here we demonstrate the synthesis of 1D HA structures using an optimized, urea-assisted, high-yield hydrothermal batch process. The one-pot process, yielding HA structures composed of bundles of ribbons and wires, was typified by the simultaneous occurrence of a multitude of intermediate reactions, failing to meet the uniformity criteria over particle morphology and size...
November 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27506472/analysis-method-for-quantifying-the-morphology-of-nanotube-networks
#9
Dusan Vobornik, Shan Zou, Gregory P Lopinski
While atomic force microscopy (AFM) is a powerful technique for imaging assemblies and networks of nanoscale materials, approaches for quantitative assessment of the morphology of these materials are lacking. Here we present a volume-based approach for analyzing AFM images of assemblies of nano-objects that enables the extraction of relevant parameters describing their morphology. Random networks of single-walled carbon nanotubes (SWCNTs) deposited via solution-phase processing are used as an example to develop the method and demonstrate its utility...
August 30, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27468781/giant-surface-conductivity-enhancement-in-a-carbon-nanotube-composite-by-ultraviolet-light-exposure
#10
Christian J Long, Nathan D Orloff, Kevin A Twedt, Thomas Lam, Fernando Vargas-Lara, Minhua Zhao, Bharath Natarajan, Keana C Scott, Eric Marksz, Tinh Nguyen, Jack F Douglas, Jabez McClelland, Edward Garboczi, Jan Obrzut, J Alexander Liddle
Carbon nanotube composites are lightweight, multifunctional materials with readily adjustable mechanical and electrical properties-relevant to the aerospace, automotive, and sporting goods industries as high-performance structural materials. Here, we combine well-established and newly developed characterization techniques to demonstrate that ultraviolet (UV) light exposure provides a controllable means to enhance the electrical conductivity of the surface of a commercial carbon nanotube-epoxy composite by over 5 orders of magnitude...
September 7, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27455765/quasicrystal-as-a-catalyst-for-the-synthesis-of-carbon-nanotubes
#11
K Kajiwara, Y Matsui, T P Yadav, N K Mukhopadhyay, O N Srivastava
The present report describes the catalytic activity of mechanically activated nano quasicrystalline Al65Cu20Fe15 and related nano crystalline Al50Cu28Fe22 for the synthesis of carbon nanotubes (CNTs). CNTs are synthesized by catalytic decomposition of ethanol through nano quasicrystalline Al65Cu20Fe15 and related crystalline Al50Cu28Fe22 alloys as a catalyst. The synthesized multi-walled CNTs exhibits tube diameter ranging from 5 to 25 nm. The synthesized CNTs are characterized by scanning and transmission electron microscopy...
March 2016: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/27451189/synthesis-of-fe3o4-sio2-osi-ch2-3nhrn-ch2pph2-2pdcl2-type-nanocomposite-complexes-highly-efficient-and-magnetically-recoverable-catalysts-in-vitamin-k3-synthesis
#12
Serhan Uruş
The synthesis of aminomethylphosphine-metal complexes have opened a new perspective to the catalytic applications of organic compounds. Magnetic Fe3O4 nano-core was synthesized using the closed quartz tube with Teflon cover and microwaved 200°C for 1h with power controlled instrument set to max. 600W. Novel nano-composite supported; Fe3O4@SiO2(CH2)3NHArN(CH2PPh2)2 and Fe3O4@SiO2(CH2)3N(CH2PPh2)2 type bis(diphenylphosphinomethyl)amino ligands and their Pd(II) complexes have been synthesized and characterized with FT-IR, SEM, EDX, TEM, UV-Visible, XRD and TG/DTA techniques...
December 15, 2016: Food Chemistry
https://www.readbyqxmd.com/read/27433653/electrochemical-properties-of-ha-coated-titanium-dioxide-nanotubes
#13
Kyungho Kang, Ahmad Zakiyuddin, Kwangmin Lee
CP Grade II titanium was first anodized in order to form TiO2 nanotubes, and then the TiO2 nano- tubes were coated with hydroxyapatite using the sol-gel method. The electrochemical properties of pure Ti, anodized TiO2 nanotubes, and HA-coated TiO2 nanotubes were investigated using poten- tiodynamic polarization and impedance tests. The sol-gel-coated HA nanoparticles were observed to sufficiently penetrate into the TiO2 nanotubes, and the polarization resistance of the HA-coated titanium nanotubes was higher than that of those that had just been anodized...
February 2016: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/27401089/flexible-field-emitter-for-x-ray-generation-by-implanting-cnts-into-nickel-foil
#14
Bin Sun, Yan Wang, Guifu Ding
This paper reports a novel implanting micromachining technology. By using this method, for the first time, we could implant nano-scale materials into milli-scale metal substrates at room temperature. Ni-based flexible carbon nanotube (CNT) field emitters were fabricated by the novel micromachining method. By embedding CNT roots into Ni foil using polymer matrix as transfer media, effective direct contact between Ni and CNTs was achieved. As a result, our novel emitter shows relatively good field emission properties such as low turn-on field and good stability...
December 2016: Nanoscale Research Letters
https://www.readbyqxmd.com/read/27398479/acetones-removal-with-fe-doped-titanium-nano-tube-catalysts-prepared-from-slag-iron-in-steel-plant
#15
Yu-Jung Lin, Wen-ZhiCao, Chang-Tang Chang
TiO₂ has been studied most commonly because it has high stability, non-toxicity, high catalytic activity, and highly conductivity. Many studies have shown that TiO₂ would generate electron-hole pairs illuminated with UV and surround more energy than that before being illuminated. However, the surface area of TiO₂ is not large enough and the adsorption capacity is small. In this study, the titanium nano tube (TNT) catalysts were prepared to increase the surface area and adsorption capacity. The Fe-TNT was also prepared from slag iron since many slag iron cause waste treatment problems...
January 2016: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/27370689/ir-maldi-ion-mobility-spectrometry
#16
José Villatoro, Martin Zühlke, Daniel Riebe, Jens Riedel, Toralf Beitz, Hans-Gerd Löhmannsröben
The novel combination of infrared matrix-assisted laser dispersion and ionization (IR-MALDI) with ion mobility (IM) spectrometry makes it possible to investigate biomolecules in their natural environment, liquid water. As an alternative to an ESI source, the IR-MALDI source was implemented in an in-house-developed ion mobility (IM) spectrometer. The release of ions directly from an aqueous solution is based on a phase explosion, induced by the absorption of an IR laser pulse (λ = 2.94 μm, 6 ns pulse width), which disperses the liquid as nano- and micro-droplets...
September 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27228654/-neuronal-differentiation-of-pc12-cell-line-and-murine-neural-stem-cells-on-the-carbon-nanotubes-films
#17
G A Posypanova, A I Gaiduchenko, E Yu Moskaleva, G E Fedorov
The study of the interaction of nerve cells with specially designed substrates (scaffolds) with different surface characteristics at the nanoscale is a necessary step in the development of methods of stimulation of regeneration of nervous tissues, as well as to create next generation of bioelectronic devices. A promising material for such scaffolds may be carbon nanotubes (CNT) that are flexible films of graphene rolled into nano-sized cylindrical tubes. CNT were produced by chemical deposition from the gas phase...
2016: Tsitologiia
https://www.readbyqxmd.com/read/27188622/dispersibility-of-vapor-phase-oxygen-and-nitrogen-functionalized-multi-walled-carbon-nanotubes-in-various-organic-solvents
#18
Maryam Khazaee, Wei Xia, Gerhard Lackner, Rafael G Mendes, Mark Rümmeli, Martin Muhler, Doru C Lupascu
The synthesis and characterization of gas phase oxygen- and nitrogen-functionalized multi-walled carbon nanotubes (OMWCNTs and NMWCNTs) and the dispersibility of these tubes in organic solvents were investigated. Recently, carbon nanotubes have shown supreme capacity to effectively enhance the efficiency of organic solar cells (OSCs). A critical challenge is to individualize tubes from their bundles in order to provide homogenous nano-domains in the active layer of OSCs. OMWCNTs and NMWCNTs were synthesized via HNO3 vapor and NH3 treatments, respectively...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27152376/connecting-effect-on-the-first-hyperpolarizability-of-armchair-carbon-boron-nitride-heteronanotubes-pattern-versus-proportion
#19
Rong-Lin Zhong, Hong-Liang Xu, Zhong-Min Su
Carbon-boron-nitride heteronanotubes (BNCNT) have attracted a lot of attention because of their adjustable properties and potential applications in many fields. In this work, a series of CA, PA and HA armchair BNCNT models were designed to explore their nonlinear optical (NLO) properties and provide physical insight into the structure-property relationships; CA, PA and HA represent the models that are obtained by doping the carbon segment into pristine boron nitride nanotube (BNNT) fragments circularly around the tube axis, parallel to the tube axis and helically to the tube axis, respectively...
May 18, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27137954/the-characterisation-of-diesel-exhaust-particles-composition-size-distribution-and-partitioning
#20
Mohammed S Alam, Soheil Zeraati-Rezaei, Christopher P Stark, Zhirong Liang, Hongming Xu, Roy M Harrison
A number of major research questions remain concerning the sources and properties of road traffic generated particulate matter. A full understanding of the composition of primary vehicle exhaust aerosol and its contribution to secondary organic aerosol (SOA) formation still remains elusive, and many uncertainties exist relating to the semi-volatile component of the particles. Semi-Volatile Organic Compounds (SVOCs) are compounds which partition directly between the gas and aerosol phases under ambient conditions...
July 18, 2016: Faraday Discussions
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