scholarly journals Mechanochemical Synthesis of Nanocrystalline Hydroxyapatite Coating

2010 ◽  
Vol 12 (2) ◽  
pp. 79 ◽  
Author(s):  
Ahmed E. Hannora ◽  
Alexander S. Mukasyan ◽  
Zulkhair A. Mansurov
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
High Energy ◽  
Transformation Process ◽  
Paramagnetic Resonance ◽  
Inductively Coupled ◽  
Novel Approach ◽  
Transmission Electron

A novel approach for depositing of hydroxyapatite (HA) films on titanium substrates by using high energy ball milling (HEBM) has been developed. It was demonstrated that a heat treatment of the mechanically coated HA at 800 °C for one hour leads to partial transformation of HA phase to -TCP. It appears that the grain boundary and interface defects formed during MCS reduce this characteristic transformation temperature. Also, it was shown that Ti incorporation into the HA structure causes the lattice shrinkage and reduction of its grain size as compared to pure HA, but also promote the phase transformation of HA to TCP at high temperature. It is important that doping HA by silicon, while also significantly decrease crystallinity of deposited HA layer, results in hindering of the phase transformation process. The Si-doped HA does not show phase transition or decomposition after heat treatment even at<br />900 °C. The samples were investigated by X-ray diffraction, scanning electron microscope, Energy dispersive spectroscopy, Atomic force microscopy, Transmission electron microscopy, inductively coupled plasma (ICP) optical emission spectrometer, Vickers microhardness, Electron paramagnetic resonance.

Fabrication of Diamond and Diamond-Like Carbon by Low Pressure Inductively Coupled Plasma CVD

1994 ◽  
Vol 363 ◽  
Author(s):  
Katsuyuki Okada ◽  
Shojiro Komatsu ◽  
Takamasa Ishigaki ◽  
Seiichiro Matsumoto
Keyword(s):  
Electron Diffraction ◽  
Inductively Coupled Plasma ◽  
High Energy ◽  
Diamond Like Carbon ◽  
Diffraction Reflection ◽  
High Energy Electron ◽  
Plasma Cvd ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Faraday Shield

AbstractA 13.56 MHz inductively coupled plasma(ICP) system has been applied to fabricate diamond and diamond-like carbon from a CH4/H2/Ar plasma. The characterizations of the obtained deposits by transmission electron diffraction, reflection high energy electron diffraction, and Raman scattering revealed that the deposits are diamond crystallites, with crystal sizes ∼1μm, and that they partially include disordered microcrystalline graphite. Although contamination due to etching of the quartz tube exists, this was drastically suppressed by the electrostatic shield(Faraday shield).

scholarly journals Hydrogenation of benzene and toluene over supported rhodium and rhodium-gold catalysts

2021 ◽  
Vol 340 ◽  
pp. 01026
Author(s):  
Sapar Konuspayev ◽  
Minavar Shaimardan ◽  
Nurlan Annas ◽  
T.S. Abildin ◽  
Y.Y. Suleimenov
Keyword(s):  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Gold Catalysts ◽  
Hydrogenation Reaction ◽  
Benzene Hydrogenation ◽  
X Ray Diffraction ◽  
Toluene Hydrogenation ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Colloidal Method

Rhodium and rhodium-gold catalysts supported on amorphous aluminosilicates (ASA), titanium dioxide (rutile, TiO2) was prepared in two different ways: absorption and colloidal method. The catalysts were characterized by an inductively coupled plasma optical emission spectrometer (ICP-OES), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The activity and selectivity of the prepared catalysts were tested by the hydrogenation of benzene and toluene. Hydrogenation was conducted at a pressure of 4 MPa and a temperature 80 °C. The bimetallic Rh-Au/ASA catalyst prepared by the absorption method showed higher activity and selectivity in benzene hydrogenation reaction, the same catalyst prepared by the colloidal method demonstrated lower selectivity.

scholarly journals Catalytic Properties of Alumina-Supported Ruthenium, Platinum, and Cobalt Nanoparticles towards the Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone

2018 ◽  
Vol 13 (1) ◽  
pp. 24
Author(s):  
Ilhem Rekkab-Hammoumraoui ◽  
Abderrahim Choukchou-Braham
Keyword(s):  
Inductively Coupled Plasma ◽  
Catalytic Properties ◽  
Optical Emission ◽  
Cobalt Nanoparticles ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inductively Coupled ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Transmission Electron

A series of metal-loaded (Ru, Pt, Co) alumina catalysts were evaluated for the catalytic oxidation of cyclohexane using tertbutylhydroperoxide (TBHP) as oxidant and acetonitrile or acetic acid as solvent. These materials were prepared by the impregnation method and then characterized by Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES), H2 chemisorption, Fourier Transformed Infrared Spectroscopy (FTIR), High-Resolution Transmission Electron Microscopy (HRTEM), and X-ray Diffraction (XRD). All the prepared materials acted as efficient catalysts. Among them, Ru/Al2O3 was found to have the best catalytic activity with enhanced cyclohexane conversion of 36 %, selectivity to cyclohexanol and cyclohexanone of 96 % (57.6 mmol), and cyclohexane turnover frequency (TOF) of 288 h-1. Copyright © 2018 BCREC Group. All rights reservedReceived: 26th May 2017; Revised: 17th July 2017; Accepted: 18th July 2017; Available online: 22nd January 2018; Published regularly: 2nd April 2018How to Cite: Rekkab-Hammoumraoui, I., Choukchou-Braham, A. (2018). Catalytic Properties of Alumina-Supported Ruthenium, Platinum, and Cobalt Nanoparticles towards the Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone. Bulletin of Chemical Reaction Engineering & Catalysis, 13(1): 24-36 (doi:10.9767/bcrec.13.1.1226.24-35) 

A multimethodic approach for the characterization of manganiceladonite, a new member of the celadonite family from Cerchiara mine, Eastern Liguria, Italy

2017 ◽  
Vol 81 (1) ◽  
pp. 167-173
Author(s):  
G. O. Lepore ◽  
L. Bindi ◽  
F. Di Benedetto ◽  
E. Mugnaioli ◽  
C. Viti ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Paramagnetic Resonance ◽  
Oh Groups ◽  
International Mineralogical Association ◽  
Cell Parameters ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Plasma Mass Spectrometry

AbstractIn the manganesiferous ores associated with the metacherts of the ophiolitic sequences at the Cerchiara mine, Eastern Liguria (Italy), a new Mn-bearing mineral belonging to the mica group has been recently found and characterized. High resolution transmission electron microscopy and electron diffraction tomography studies confirm that the mineral belongs to the mica group. Unit-cell parameters from the powder diffraction pattern are:a= 5.149(1),b= 8.915(1),c= 10.304(1) Å, β = 102.03(1)°, space groupC2 orC2/m. On the basis of the electron paramagnetic resonance spectroscopic results, the Mn4+content represents a very subordinate fraction of the total Mn, the remaining occurring as Mn3+. The Raman spectrum clearly indicates the presence of OH groups in the structure. Laser-ablation inductively-coupled-plasma mass-spectrometry measurements assess the presence of considerable amounts of Li.Assuming all Mn as Mn3+and 22 negative charges, the empirical formula can be expressed as: (K0.83□0.17)(Mn1.143+Mg0.80Li0.20Fe0.023+)(Si3.89Al0.10)O10[(OH)1.92F0.08] with the sum of the octahedral cations indicating a 'transitional' character between a di- and a tri-octahedral structure. This formula corresponds ideally to the Mn3+analogue of celadonite, thus expanding the range of solid solution in the celadonite family. The ideal end-member formula KMn3+MgSi4O10(OH)2can be easily related to celadonite by the homovalent substitutionVIMn3+→VIFe3+. The mineral and its name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association, (IMA 2015-052).

Preparation of microcrystalline diamond in a low pressure inductively coupled plasma

1999 ◽  
Vol 14 (2) ◽  
pp. 578-583 ◽  
Author(s):  
Katsuyuki Okada ◽  
Shojiro Komatsu ◽  
Seiichiro Matsumoto
Keyword(s):  
Electron Diffraction ◽  
Inductively Coupled Plasma ◽  
Low Pressure ◽  
Growth Conditions ◽  
High Energy ◽  
Diamond Growth ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Effective Role ◽  
Electrostatic Coupling

A 13.56 MHz low pressure inductively coupled plasma (ICP) has been applied to prepare diamond films. The Faraday shield drastically suppressed the electrostatic coupling, which frequently causes contamination due to the etching of the quartz tube. The characterizations of the obtained deposits by scanning electron microscopy (SEM), transmission electron diffraction (TED), and reflection high energy electron diffraction (RHEED) revealed that the deposits are composed of microcrystalline diamond and disordered microcrystalline graphite. The CO additive to a CH4/H2 plasma brought about the morphological change from a scale-like deposit to a particle one. Besides, the number of encountered particles was increased with an increase of CO additive. The TED and RHEED observations showed that non-diamond carbon was effectively removed with an increase of CO additive. These results indicate that oxygen-contained radicals produced by the addition of CO play an effective role in the removal of non-diamond carbon in the diamond growth conditions and that the CO additive makes the supersaturation degree of carbon large.

Recovery of Nickel from Waste Lithium Ion Secondary Battery and Fabrication of Nickel Nanopowder

2017 ◽  
Vol 733 ◽  
pp. 22-26 ◽  
Author(s):  
Sung Ok Hwang ◽  
Byung Man Chae ◽  
Deuk Hyeon Kim ◽  
Ki Sang Park ◽  
A Ra Go ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Nickel Sulfate ◽  
Lithium Ion ◽  
Optical Emission ◽  
Sulfate Solution ◽  
Precipitation Method ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Solvent Extraction Method ◽  
Nickel Nanopowder

A study on the refining of nickel sulfate solution from sulfuric acid leached solution of spent lithium ion battery and fabrication of nickel nanopowders from the nickel sulfate solution was investigated. the nickel sulfate solution with high purity (>99.9%) was refined by precipitation method and solvent extraction method. the nickel nanopowders were synthesized by liquid phase reduction method with hydrazine and sodium hydroxide. the purity of nickel sulfate solution and nickel nanopowders were measured by EDTA(ethylenediaminetetraacetic) titration method with ICP-OES(inductively coupled plasma optical emission spectrometer). morphology, particle size and crystal structure of the nickel nanopowder was observed using transmission electron microscopy and x-ray diffraction spectroscopy.

scholarly journals Carbon supported manganese(IV)–cobalt(II/III) oxides nanoparticles for high-performance electrochemical supercapacitors

Chemija ◽  
2020 ◽  
Vol 31 (2) ◽  
Author(s):  
Jolita Jablonskienė ◽  
Dijana Šimkūnaitė ◽  
Jūratė Vaičiūnienė ◽  
Giedrius Stalnionis ◽  
Audrius Drabavičius ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Inductively Coupled Plasma ◽  
High Performance ◽  
Optical Emission ◽  
Spherical Shape ◽  
High Specific Capacitance ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
One Step ◽  
Shape Of Nanoparticles

The carbon supported manganese(IV)–cobalt (II/III) oxides nanoparticles labelled as MnO2–Co3O4/C nanocomposites have been prepared by a simple one-step microwave-assisted heating method using different precursor materials. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and inductively coupled plasma optical emission spectroscopy (ICP-OES) have been used for the characterization of morphology, structure and composition of the synthesized nanocomposites, whereas the electrochemical performance of the prepared nanocomposites has been evaluated by using cyclic voltammetry (CV). It was determined that the use of different precursor materials for the synthesis of the carbon supported MnO2 and Co3O4 nanocomposites results in a different morphology of the prepared substances. A high specific capacitance (Cs) of 658.8 F g−1 at a scan rate of 10 mV s−1 in a 1 M Na2SO4 solution has been obtained for the MnO2–Co3O4/C-2 nanocomposite that has a spherical shape of nanoparticles. Moreover, it significantly outperforms the MnO2–Co3O4/C-1 nanocomposite that has a lamellar shape of nanoparticles.

scholarly journals Use of Magnetic Folate-Dextran-Retinoic Acid Micelles for Dual Targeting of Doxorubicin in Breast Cancer

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
J. Varshosaz ◽  
H. Sadeghi-aliabadi ◽  
S. Ghasemi ◽  
B. Behdadfar
Keyword(s):  
Retinoic Acid ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Hydrophobic Core ◽  
X Ray Diffraction ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Scanning Calorimetry ◽  
Inductively Coupled ◽  
Transmission Electron

Amphiphilic copolymer of folate-conjugated dextran/retinoic acid (FA/DEX-RA) was self-assembled into micelles by direct dissolution method. Magnetic iron oxide nanoparticles (MNPs) coated with oleic acid (OA) were prepared by hydrothermal method and encapsulated within the micelles. Doxorubicin HCl was loaded in the magnetic micelles. The characteristics of the magnetic micelles were determined by Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM). The crystalline state of OA-coated MNPs and their heat capacity were analyzed by X-ray diffraction (XRD) and differential scanning calorimetry (DSC) methods, respectively. The iron content of magnetic micelles was determined using inductively coupled plasma optical emission spectrometry (ICP-OES). Bovine serum albumin (BSA) was used to test the protein binding of magnetic micelles. The cytotoxicity of doxorubicin loaded magnetic micelles was studied on MCF-7 and MDA-MB-468 cells using MTT assay and their quantitative cellular uptake by fluorimetry method. TEM results showed the MNPs in the hydrophobic core of the micelles. TGA results confirmed the presence of OA and FA/DEX-RA copolymer on the surface of MNPs and micelles, respectively. The magnetic micelles showed no significant protein bonding and reduced the IC50of the drug to about 10 times lower than the free drug.

scholarly journals Rhodium Nanoparticles Stabilized by PEG-Tagged Imidazolium Salts as Recyclable Catalysts for the Hydrosilylation of Internal Alkynes and the Reduction of Nitroarenes

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1195
Author(s):  
Guillem Fernández ◽  
Roser Pleixats
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Water Soluble ◽  
X Ray ◽  
Rhodium Nanoparticles ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Internal Alkynes ◽  
Recyclable Catalysts

PEGylated imidazolium (bromide and tetrafluoroborate) and tris-imidazolium (bromide) salts containing triazole linkers have been used as stabilizers for the preparation of water-soluble rhodium(0) nanoparticles by reduction of rhodium trichloride with sodium borohydride in water at room temperature. The nanomaterials have been characterized (Transmission Electron Microscopy, Electron Diffraction, X-ray Photoelectron Spectroscopy, Inductively Coupled Plasma-Optical Emission Spectroscopy). They proved to be efficient and recyclable catalysts for the stereoselective hydrosilylation of internal alkynes, in the presence or absence of solvent, and in the reduction of nitroarenes to anilines with ammonia-borane as hydrogen donor in aqueous medium (1:4 tetrahydrofuran/water).

scholarly journals Isolation and Characterization of Environmental Bacteria Capable of Extracellular Biosorption of Mercury

2011 ◽  
Vol 78 (4) ◽  
pp. 1097-1106 ◽  
Author(s):  
Fabienne François ◽  
Carine Lombard ◽  
Jean-Michel Guigner ◽  
Paul Soreau ◽  
Florence Brian-Jaisson ◽  
...  
Keyword(s):  
Toxic Metals ◽  
Inductively Coupled Plasma ◽  
Extracellular Polymeric Substances ◽  
River Sediments ◽  
Bacterial Biomass ◽  
Optical Emission ◽  
Dry Weight ◽  
Inductively Coupled ◽  
Isolation And Characterization ◽  
Transmission Electron

ABSTRACTAccumulation of toxic metals in the environment represents a public health and wildlife concern. Bacteria resistant to toxic metals constitute an attractive biomass for the development of systems to decontaminate soils, sediments, or waters. In particular, biosorption of metals within the bacterial cell wall or secreted extracellular polymeric substances (EPS) is an emerging process for the bioremediation of contaminated water. Here the isolation of bacteria from soil, effluents, and river sediments contaminated with toxic metals permitted the selection of seven bacterial isolates tolerant to mercury and associated with a mucoid phenotype indicative of the production of EPS. Inductively coupled plasma-optical emission spectroscopy and transmission electron microscopy in conjunction with X-ray energy dispersive spectrometry revealed that bacteria incubated in the presence of HgCl2sequestered mercury extracellularly as spherical or amorphous deposits. Killed bacterial biomass incubated in the presence of HgCl2also generated spherical extracellular mercury deposits, with a sequestration capacity (40 to 120 mg mercury per g [dry weight] of biomass) superior to that of live bacteria (1 to 2 mg mercury per g [dry weight] of biomass). The seven strains were shown to produce EPS, which were characterized by Fourier transform-infrared (FT-IR) spectroscopy and chemical analysis of neutral-carbohydrate, uronic acid, and protein contents. The results highlight the high potential of Hg-tolerant bacteria for applications in the bioremediation of mercury through biosorption onto the biomass surface or secreted EPS.

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