Synthesis of TiO2/Zno Core/Shell Type Nanocomposite via Sol-Gel Method

2011 ◽  
Vol 471-472 ◽  
pp. 993-998 ◽  
Author(s):  
Mohammad Reza Golobostanfard ◽  
Reza Ebrahimifard ◽  
Hossein Abdizadeh
Keyword(s):  
Sol Gel ◽  
Average Diameter ◽  
Photoluminescence Spectroscopy ◽  
Gel Method ◽  
Sol Gel Method ◽  
Tio2 Particles ◽  
Heat Treated ◽  
Composition Structure ◽  
Xrd Patterns ◽  
Nanocomposite Powders

TiO2/ZnO Nanocomposite powders with different Zn/Ti ratios were synthesized via sol-gel method. The as prepared and calcined Titania nanopowders were added to the ZnO sols. Also the as prepared and calcined ZnO nanopowders were separately added to the TiO2 sols. However, in the latter case, the nanocomposite never formed due to the high acidity of the sols. After gelation, the powders were dried and calcined at 500°C for 1h. The phase composition, structure, morphology and optoelectrical properties of the powders were characterized by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), UV-Vis photospectroscopy and photoluminescence spectroscopy (PL). The XRD patterns confirm the presence of TiO2 and ZnO crystalline phases in the TiO2 particles/ZnO sol samples. The FESEM micrographs show that TiO2/ZnO nanocomposites heat treated at 500°C were formed with average diameter of about 250nm with 50nm ZnO particles on clusters of 40nm TiO2 particles. It was found that the optoelectronic properties of the nanocomposites were improved according to the UV-Vis and photoluminescence spectroscopy.

INFLUENCE OF B4C TO TTIP MOLAR RATIO ON SYNTHESIS OF NANO TITANIUM DIBORIDE POWDERS VIA SOL-GEL METHOD

2012 ◽  
Vol 05 ◽  
pp. 219-226
Author(s):  
HAMED SINAEI POUR FARD ◽  
HAMIDREZA BAHARVANDI ◽  
HOSSEIN ABDIZADEH
Keyword(s):  
Titanium Diboride ◽  
Electrode Materials ◽  
Sol Gel ◽  
Sem Analysis ◽  
Molar Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Heat Treated ◽  
Xrd Patterns ◽  
Titanium Diboride Powders

Titanium diboride ( TiB 2) has attracted great interests for its excellent mechanical properties, chemical resistance and good thermal and electrical conductivities. So it is widely applied as cutting tool composites, wear resistant parts, metal melting crucibles and electrode materials. This paper presents synthesis of nano titanium diboride powders via sol-gel method using a mixture of TTIP and B 4 C as precursors. In the hydrolysis step, B 4 C to TTIP molar ratio varied from 1.3 to 2.5. Solution samples stirred well and after aging and drying process, they were heat treated in an argon atmosphere. X-ray diffraction (XRD) patterns and Scanning electron microscopy (SEM) analysis showed that the percentage of synthesized TiB 2 increased gradually as the molar ratio of B 4 C to TTIP reached to 2.3, afterward increasing the B 4 C to TTIP molar ratio caused decreasing of titanium diboride percentage.

STRUCTURAL STUDIES OF ALUMINUM-DOPED LANTHANUM BORATES

2002 ◽  
Vol 16 (23n24) ◽  
pp. 915-921
Author(s):  
S. SIMON ◽  
M. POP ◽  
GH. BORODI ◽  
D. DJURADO
Keyword(s):  
Rietveld Refinement ◽  
Sol Gel ◽  
Structural Data ◽  
Structural Studies ◽  
X Ray Diffraction ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Heat Treated ◽  
Xrd Patterns

Powder X-ray diffraction structural studies on aluminum-doped lanthanum borates La 4-y Al y B 4 O 12 were carried out on samples with y = 1, 2 starting compositions heat-treated at temperatures between 860°C and 1200°C. The samples were prepared by the sol-gel method. The structural data were obtained by the Rietveld refinement of the XRD patterns.

scholarly journals Monoclinic Li2TiO3 Nano-particles via sol-gel method: Structure and impedance spectroscopy

2019 ◽  
Vol 8 (3) ◽  
pp. 209
Author(s):  
Fatima Zahra Krimech ◽  
Salaheddine Sayouri ◽  
Taj-Edine Lamcharfi ◽  
Fatima Zahra Ahjyaje
Keyword(s):  
Impedance Spectroscopy ◽  
Sol Gel ◽  
Low Frequency ◽  
Transport Processes ◽  
Nano Particles ◽  
Secondary Phases ◽  
Conventional Solid State Reaction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Heat Treated

<p>Pure phase Li<sub>2</sub>TiO<sub>3 </sub>nano-particles were synthesized by the sol-gel method and the structural properties were examined with X-ray diffraction (XRD) technique. The latter showed that these materials, heat treated at relatively low temperature 900°C during 4h compared to the conventional solid-state reaction which calcination temperature is about 900–1100°C for 10 h; crystallize in the monoclinic phase without the presence of secondary phases. The microstructure of the LT ceramic (sintered at 1100°C) were determined by SEM and a good crystalline nature was observed with an average of granular size 2 μm. Moreover, the impedance spectroscopy showed at a higher temperature of 500°C the low-frequency arc due either to the grain boundary or sample-electrode charge transport processes.</p>

Effects of Polyvinyl Pyrrolidone on Electromagnetic Properties of Hexagonal Ferrite Prepared by the Sol-Gel Method

2011 ◽  
Vol 197-198 ◽  
pp. 593-597
Author(s):  
Xiao Gu Huang ◽  
Jiao Chen ◽  
Peng De Han ◽  
Hong Zhou Wang ◽  
Shao Teng Yan ◽  
...  
Keyword(s):  
Sol Gel ◽  
Hexagonal Ferrite ◽  
Polyvinyl Pyrrolidone ◽  
Electromagnetic Properties ◽  
Hexagonal Ferrites ◽  
Gel Method ◽  
Sol Gel Method ◽  
Method Effects ◽  
Xrd Patterns ◽  
Particle Thickness

Ba(Zn0.3Co0.7)2Fe16O27hexagonal ferrites have been prepared by sol-gel method. Effects of polyvinyl pyrrolidone (PVP) on crystalline phase, natural surface and electromagnetic properties were analyzed. The XRD patterns of samples with and without PVP added both showed the single phase of hexagonal ferrite. The particle thickness increased when PVP was added. Moreover, Ferrites prepared with 2.0g PVP added into the sol solution had lower complex permittivity. Addition of PVP can be an effective way to obtain the electromagnetic match of hexagonal ferrites.

Characterization and Photocatalytic Activity of FeVO4 Photocatalysts Synthesized via a Surfactant-Assisted Sol-Gel Method

2011 ◽  
Vol 197-198 ◽  
pp. 926-930
Author(s):  
Min Wang ◽  
Qiong Liu ◽  
Chen Zhi Jiang
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Gel Method ◽  
Sol Gel Method ◽  
Photodegradation Rate ◽  
Photocatalytic Activities ◽  
Xrd Patterns ◽  
Surfactant Assisted

FeVO4photocatalysts were synthesized via a surfactant-assisted sol-gel method and characterized with X-ray diffraction (XRD), scanning electron microsoope （SEM）and specific surface area (BET). The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO) solution under visible light. The XRD patterns of no-surfactant-assisted, PEG-assisted, CTAB-assisted and SDS-assisted FeVO4, indicate that diffraction peaks can be well indexed as triclinc FeVO4. And the crystalline sizes of samples were evaluated as 113, 69, 66, 76 nm for FVO, FVO-PEG, FVO-CATB and FVO-SDS respectively.The addition of surfactant woul greatly affect the morphology of FeVO4photocatalysts, which can lead to different photocatalytic activities between them. In the experimental conditions used, the PEG-assisted FeVO4product had a much higher photocatalytic activity (the photodegradation rate was about 77% or so in 14h) than the other three products.

Synthesis and Luminescent Properties of Mn2+-Doped Zinc Silicate Phosphors by Sol-Gel Method

2010 ◽  
Vol 434-435 ◽  
pp. 214-216 ◽  
Author(s):  
Ji Ming Zhang ◽  
Dong Lin Zhao ◽  
Zeng Min Shen
Keyword(s):  
Sol Gel ◽  
Green Light ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Nano Particles ◽  
Light Emitting ◽  
Gel Method ◽  
Sol Gel Method ◽  
Structural Details ◽  
Xrd Patterns

Abstract. Green light emitting Mn2+-doped Zn2SiO4 (Zn2SiO4:Mn2+) phosphor nano-particles were synthesized by sol-gel method combined with a furnace firing from the sol-gel solution made with ZnO, MnCO3 and tetraethoxysilan. The influences of annealing temperatures on the microstructures and photoluminescent properties of the Zn2SiO4:Mn2+ phosphors were investigated. The structural details of the phosphors were examined through XRD and SEM. The photoluminescent properties of the Zn2SiO4:Mn2+ phosphors were characterized by excitation and emission spectra. The results indicate that the XRD patterns of the Zn2SiO4:Mn2+ phosphors exhibit a willemite structure (-Zn2SiO4). Green photoluminescence whose emission peak is located at 525 nm were observed from the synthesized phosphor particles under UV excitation. The photoluminescent mechanisms of the Zn2SiO4:Mn2+ phosphors were discussed.

Structural and magnetic properties of Sb3+ ions doped Ni-Ba-Co ferrite prepared by sol-gel method

2021 ◽  
Author(s):  
Yanchun Zhang ◽  
Aimin Sun ◽  
Liqiong Shao ◽  
Zhaxi Suonan
Keyword(s):  
Magnetic Properties ◽  
Spinel Phase ◽  
Spinel Ferrite ◽  
Energy Dispersive Spectrometer ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Composition And Structure ◽  
Xrd Patterns

Abstract In the present work, nanocrystalline Sb3+ ions doped Ni0.2Ba0.1Co0.7Fe2−xSbxO4 (0 ≦ x ≦ 0.1, step by 0.025) ferrites were prepared via sol-gel method. The spinel-phase structure of samples can be confirmed by X-ray diffraction (XRD) patterns. The composition and structure were further studied by fourier transform infrared spectroscopy (FTIR). There were two typical characteristic bands ν1 and ν2 related to the stretching vibrations in spinel ferrite in FTIR spectra. Energy dispersive spectrometer (EDS) analyzed the elements of samples. It indicated that the elements of Ni, Ba, Co, Fe, O and Sb existed in the samples. Vibrating sample magnetometer was used to characterize magnetic properties. The saturation magnetization decreased from 57.65 emu/g to 44.50 emu/g with the increasing Sb3+ ions content, which is attributed to Fe3+ ions replaced by the Sb3+ ions. Remanent magnetization and coercivity first decreased and then increased slightly.

Photochemical hydrogen evolution on metal ion surface-grafted TiO2-particles prepared by sol/gel method without calcination

2018 ◽  
Vol 358 ◽  
pp. 386-394 ◽  
Author(s):  
Fazalurahman Kuttassery ◽  
Daisuke Yamamoto ◽  
Siby Mathew ◽  
Sebastian Nybin Remello ◽  
Arun Thomas ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Metal Ion ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Tio2 Particles

Evaluation of Sodium Titanate Coating on Titanium by Sol-Gel Method In Vitro

2007 ◽  
Vol 330-332 ◽  
pp. 777-780 ◽  
Author(s):  
Fang Fang Wang ◽  
Yun Mao Liao ◽  
Min Wang ◽  
Ping Gong ◽  
Xiao Yu Li ◽  
...  
Keyword(s):  
Alkaline Phosphatase ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Sol Gel ◽  
Sodium Titanate ◽  
Homogeneous Surface ◽  
Gel Method ◽  
Sol Gel Method ◽  
Xrd Patterns

In this study, an exclusive sodium titanate (Na2Ti6O13) coating on titanium was fabricated by sol-gel method and evaluated in vitro. The coating was characterized by SEM and XRD. The bioactivity of the Na2Ti6O13 coating was evaluated by the biomimetic growth of apatite on its surface after soaked in an acellular simulated body fluid (SBF) for a period of time. In vitro osteoblasts culture was carried out to determine cytocompatibility by the measurement of the proliferation and alkaline phosphatase (ALP) activity of the cells. XRD patterns showed that Na2Ti6O13 was well crystallized when the coating was heated at 800°C. SEM observation exhibited that the Na2Ti6O13 coated titanium had a homogeneous surface without any cracks. After immersion in SBF, the apatite layer can be formed on the coating. The cells culture showed that the osteoblasts grew well on the Na2Ti6O13 coated titanium. It can be concluded that Na2Ti6O13 coating on titanium obtained by sol-gel method is bioactive.

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