PREPARATION AND CHARACTERISTICS OF NIXZN(1-X)FE2O4-ENCAPSULATED HOLLOW GLASS SPHERES BY ERRITE PLATING

2010 ◽  
Vol 24 (15n16) ◽  
pp. 3215-3220 ◽  
Author(s):  
MEI YU ◽  
CHENG WANG ◽  
JIANHUA LIU ◽  
SNOGMEI LI ◽  
LIJIE HUANG
Keyword(s):  
Spinel Structure ◽  
Solution Concentration ◽  
X Ray Diffraction ◽  
Energy Dispersion Spectroscopy ◽  
Atom Ratio ◽  
Hollow Glass ◽  
X Ray ◽  
Glass Spheres ◽  
Xrd Patterns ◽  
Scanning Electron

Hollow glass spheres was encapsulated with a layer of Ni x Zn (1- x ) Fe 2 O 4 film without using ultrasound by ferrite plating at a temperature of 80°C. The films were characterized by X-ray diffraction (XRD), optical microscopy, scanning electron microscopy (SEM) and energy dispersion spectroscopy (EDS). XRD patterns indicated the films had spinel structure. The atom ratio of nickel to iron in the films was affected by the proportion of reactants and the synthetic conditions. The saturation magnetization of the composite spheres was enhanced from 24emu/g to 60emu/g with the increase of reactants solution concentration.

scholarly journals FTIR and Optical Properties of NiO Doped Cr2O3 Nanopar-ticles Synthesis by Hydrothermal Method

2018 ◽  
Vol 29 (1) ◽  
pp. 168
Author(s):  
Tunis Balassim Hassan
Keyword(s):  
Optical Band Gap ◽  
Average Crystallite Size ◽  
Structural Behavior ◽  
X Ray Diffraction ◽  
Nanopar Ticles ◽  
Hydrothermal Technique ◽  
X Ray ◽  
Cr2o3 Nanoparticles ◽  
Xrd Patterns ◽  
Scanning Electron

Pure and Nickel oxide doped chromium (III) oxide (Cr2O3) nanoparticals are synthesized by hydrothermal technique. The effect of dopant Ni concentration on the structural behavior of Cr2O3 nanoparticles was examined by X-ray diffraction. The average crystallite size of the synthesized nanoparticles was measured from XRD patterns using Scherrer equation and was decreased from 22nm to 12.9 nm with the increasing Nio concentration in Cr2O3 from (0, 0.01, 0.06, and 0.10). Morphologies and compositional elements of the synthesized nanoparticles were observed by the field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) spectroscopy, respectively. The optical property of the samples was measured by ultraviolet - visible (UV-Vis.) absorption spectroscopy. The observed optical band gap value ranges from 2.3eV to 2.5eV for Ni doped nanoparticles

GROWTH CONTROL OF ZnO FILMS ON GLASS BY CHEMICAL BATH DEPOSITION

2006 ◽  
Vol 13 (04) ◽  
pp. 369-373 ◽  
Author(s):  
MUNAN YU ◽  
HAIYAN XU ◽  
HAO WANG ◽  
HUI YAN ◽  
ZHILIANG PEI ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Chemical Bath Deposition ◽  
Deposition Temperature ◽  
Growth Control ◽  
Solution Concentration ◽  
Zno Films ◽  
X Ray Diffraction ◽  
Axis Orientation ◽  
X Ray ◽  
Scanning Electron

The effects of substrate-placing manner, deposition temperature and solution concentration on the preparation of ZnO films by chemical bath deposition were investigated in this work. The structures and the morphologies of as-deposited ZnO films were characterized by X-ray diffraction and scanning electron microscope, respectively. The results show that compared with vertically insertion, floating the substrates on the solutions could greatly improve the c-axis orientation of the films. The growth of ZnO films with orientation would also be favored at lower precursor concentrations and temperatures. When the concentration of Zn ( CH 3 COO )2·2 H 2 O is 0.033 M/L and the deposited temperature is 60°C, ZnO films which are well crystallized and highly c-axis orientated were obtained.

Preparation of TiO2-Pillared Montmorillonite as Photocatalyst and Photocatalytic Degradation of Methyl Orange

2012 ◽  
Vol 190-191 ◽  
pp. 534-538 ◽  
Author(s):  
Bin Xia Zhao ◽  
Li Ping Dang ◽  
Xiao Li Zhang ◽  
Na Yang ◽  
Yuan Yuan Sun
Keyword(s):  
Methyl Orange ◽  
Interlayer Space ◽  
Anatase Phase ◽  
Tetrabutyl Titanate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pillared Montmorillonite ◽  
Xrd Patterns ◽  
Degradation Of Methyl Orange ◽  
Scanning Electron

In order to obtain TiO2-pillared materials, montmorillonite (MMT) from Xinghe Co. of Neimeng as matrix, was used. The tetrabutyl titanate was used as precursor for the preparation of the TiO2-pillared montmorillonite, which was applied to introduce TiO2 into its interlayer space (15 mmol Ti/g clay). The as-prepared materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and infrared spectroscopy (IR). The XRD patterns and the SEM photograph illustrated that the layers of MMT were delaminated and all samples were of the anatase phase. The TiO2-pillared montmorillonite was shown high photoactivity for the photodegradation of methyl orange dyestuff in aqueous solution under UV irradiation. The results showed that TiO2-pillared montmorillonite containing the anatase phase of TiO2 by calcination at 773 K and it was with the highest photocatalytic activity. Comparative photodegradation experiments were also conducted under different conditions. The experimental results demonstrated the feasibility of utilizing TiO2-pillared clays as a catalyst for removing methyl orange from water.

scholarly journals Corrosion Behaviour of Zn-10Al-1.5Cu Alloy

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
C. N. Panagopoulos ◽  
A. G. Tsopani
Keyword(s):  
Electron Microscopy ◽  
Corrosion Resistance ◽  
Corrosion Behaviour ◽  
Solution Concentration ◽  
Solution Temperature ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nacl Concentration ◽  
Scanning Electron

The corrosion behaviour of Zn-10Al-1.5Cu alloy in NaCl solution was examined. The used NaCl solution concentrations were 1M, 0.3M, and 0.003M for a constant temperature values of 7°C or 25°C or 45°C. The corrosion behaviour of this alloy was investigated under potentiodynamic corrosion conditions. The surface of the corroded alloy specimens was studied with the aid of scanning electron microscopy and X-ray diffraction techniques. It was observed that the increase of NaCl concentration in the corrosion solution for a constant value of temperature led to lower corrosion resistance of the alloy. For a constant value of solution concentration, the increase of solution temperature also led to the decrease of corrosion resistance of the same alloy.

scholarly journals PREPARATION OF CHITOSAN-CELLULOSE COMPOSITE BEADS USING CELLULOSE ISOLATED FROM SUGARCANE BAGASSE

2019 ◽  
Vol 19 (2) ◽  
pp. 30-34
Author(s):  
Rahmi Rahmi ◽  
Alfahmizar Alfahmizar ◽  
Lelifajri Lelifajri
Keyword(s):  
Sugarcane Bagasse ◽  
Ftir Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
H2so4 Concentration ◽  
Composite Beads ◽  
Hydrolysis Process ◽  
Xrd Patterns ◽  
Cellulose Composite ◽  
Scanning Electron

Chitosan-cellulose composite beads had been prepared using cellulose isolated from sugarcane bagasse. Sugarcane bagasse was hydrolyzed with H2SO4 with various concentrations (30, 40, and 50%). Cellulose obtained was characterized using Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). FTIR analysis results inform the existence of typical functional groups of cellulose in the sample. XRD patterns show H2SO4 concentration on the hydrolysis process influence the crystallinity of cellulose. Cellulose was used as a filler in the preparation of chitosan-cellulose composite beads. The results show that cellulose decrease the crystallinity of chitosan. 

Electrodeposited Ni-Co Films from Electrolytes with Different Co Contents

2021 ◽  
Vol 406 ◽  
pp. 219-228
Author(s):  
Ouahiba Herzallah ◽  
Hachemi Ben Temam ◽  
Asma Ababsa ◽  
Abderrahmane Gana
Keyword(s):  
Content Increase ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Hcp Structure ◽  
Xrd Patterns ◽  
Steel Substrates ◽  
Co Alloys ◽  
Scanning Electron

Ni–Co alloy coatings were electrodeposited at various cobalt amounts on pretreated steel substrates. The co-deposition phenomenon of Ni-Co alloys was described as anomalous behaviour. Different techniques including scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), X-ray diffraction (XRD) and potentiodynamic polarization were used to characterize the alloy coatings. EDX results showed that the Co content increase with the enhancing of Co amount. SEM images have shown that the increase of Co amount leads grain developing from large grain to branched grain form and that goes through spherical and pyramidal, this implies that the grain size of these alloy coatings is greatly affected by Co amount in the electrolyte baths. XRD patterns revealed that the phase structure of Ni–Co coatings is dramatically changed from fcc into hcp structure with the increase of Co amount. The electrochemical properties of Ni-Co alloy coatings evaluated in 3.5% NaCl solution reveal that Ni–34.32 wt.% Co alloy exhibits better corrosion resistance compared to pure Ni and other Ni–Co alloy coatings.

Phase Composition and Morphology of Pottery Stone Microcrystalline Powders Synthesized by Hydrothermal Method

2013 ◽  
Vol 664 ◽  
pp. 620-624
Author(s):  
Amnouy Larpkasemsuk ◽  
Saowaroj Chuayjuljit ◽  
Dujreutai Pongkao Kashima
Keyword(s):  
Phase Composition ◽  
Hydrothermal Method ◽  
X Ray Diffraction ◽  
Major Phase ◽  
X Ray ◽  
Polyhedral Particles ◽  
Naoh Solution ◽  
Xrd Patterns ◽  
Aluminium Silicates ◽  
Scanning Electron

Pottery stone (PTS) microcrystalline powders were synthesized by a hydrothermal method using two concentrations of NaOH solution (2 M and 4 M) at 60, 80 and 120°C for 8 h in a Teflon- lined stainless steel autoclave. The phase composition and morphology of the samples were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The major phase compositions of the as-prepared PTS powders appeared in the XRD patterns are all silicate compounds such as tridymite, crystobalite, quartz, feldspar, albite, sodium silicate, analcime, hydroxyl-cancrinite and sodium aluminium silicates, depending on the NaOH concentration and the reaction temperature. Moreover, SEM micrographs showed the spherical polyhedral particles ranging from 8 to 14 µm in diameters and needle-like particles with a mean aspect ratio of 5.7 that obtained by the hydrothermal treatment operated at 120°C using 2 M and 4 M of NaOH, respectively.

Initial formation mechanisms of (Ga1−xMnx)N nanorods grown on Al2O3 (0001) substrates

2008 ◽  
Vol 23 (12) ◽  
pp. 3275-3280 ◽  
Author(s):  
K.H. Lee ◽  
J.Y. Lee ◽  
H.C. Jeon ◽  
T.W. Kang ◽  
H.Y. Kwon ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Molecular Beam ◽  
Formation Mechanisms ◽  
X Ray Diffraction ◽  
Initial Formation ◽  
X Ray ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
Xrd Patterns ◽  
Scanning Electron

The (Ga1−xMnx)N nanorods were grown on Al2O3 (0001) substrates by using rf-associated molecular beam epitaxy. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and selected-area diffraction pattern (SADP) results showed that the (Ga1−xMnx)N nanorods had (0001) preferential orientations. XRD patterns showed that the (Ga1−xMnx)N nanorods contained a small number of grains with different preferred orientations. High-resolution TEM (HRTEM) images showed that the (Ga1−xMnx)N nanorods consisted of different preferentially oriented grains. The initial formation mechanisms for the (Ga1−xMnx)N nanorods grown on Al2O3 (0001) substrates are described on the basis of the XRD, the TEM, the SADP, and the HRTEM results.

Properties and Phase Shift Structure of (1-x)BT-(x)BNT Ceramics

2016 ◽  
Vol 675-676 ◽  
pp. 615-618
Author(s):  
Chompoonuch Warangkanagool
Keyword(s):  
Sintering Temperature ◽  
Sodium Titanate ◽  
Lattice Parameter ◽  
Bismuth Sodium Titanate ◽  
X Ray Diffraction ◽  
Fluid Medium ◽  
X Ray ◽  
Xrd Patterns ◽  
Bismuth Sodium ◽  
Scanning Electron

In the research, the properties of barium titanate - bismuth sodium titanate [(1-x)BaTiO3-(x)Bi0.5Na0.5TiO3: (1-x)BT-(x)BNT] ceramics prepared by conventional mixed oxide method with various molecular weight of BNT or x between 0.0 and 0.3 were investigated. The optimum condition for calcined powders of x = 0.0 was found at 900 °C for 2 h, and x = 0.1 - 0.3 were found at 850 °C for 2h. The calcined powders were pressed and sintered at 1000 – 1200 °C for 2h. The phase structure was examined by x-ray diffraction (XRD). The microstructure was examined by scanning electron microscopy (SEM). Density of sintered samples was measured by Archimedes method with distilled water as the fluid medium. It was found that, all various x of (1-x)BT-(x)BNT ceramics XRD patterns display the tetragonality increased with increasing sintering temperature. All the peaks shift to higher angles when increasing x value indicating the decrease of lattice parameter “a” and increase of lattice parameter “c”. The average grains size of (1-x)BT-(x)BNT ceramics was increased with increasing sintering temperature. The highest density was 5.53 g/cm3 and was obtained from the sample sintered at 1200 °C.

Synthesis, Characterization and Catalytic Performance of Nanoferrites Subjected to the Esterification Reaction

2014 ◽  
Vol 775-776 ◽  
pp. 421-426 ◽  
Author(s):  
Adriano Santana Silva ◽  
Joelda Dantas ◽  
J.R.D. Santos ◽  
R.B.L. Cunha ◽  
R.H.G.A. Kiminami ◽  
...  
Keyword(s):  
Active Catalyst ◽  
Catalytic Performance ◽  
Esterification Reaction ◽  
X Ray Diffraction ◽  
Inverse Spinel ◽  
Agglomerate Size ◽  
X Ray ◽  
Conversion Rates ◽  
Xrd Patterns ◽  
Scanning Electron

Ni0.5Zn0.5Fe2O4, Mn0.5Zn0.5Fe2O4and Ni0.2Cu0.3Zn0.5Fe2O4nanoferrites were synthesized, characterized and evaluated in terms of their performance as catalysts in the methyl esterification reaction of soybean oil. The nanoferrites were synthesized by combustion and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The XRD patterns show the presence of inverse spinel B(AB)2O4phase. The EDX results confirmed the stoichiometry of the nanoferrite systems, whose morphology consisted of large block-like agglomerates with a brittle aspect and a wide agglomerate size distribution. The results indicate that the Ni0.5Zn0.5Fe2O4nanoferrite was the most active catalyst in the esterification reaction, with conversion rates ranging from 40 to 91%.

Sign in / Sign up

Export Citation Format

Share Document