scholarly journals Structural and Fluorescence Properties of TiO2/Ag Nanoparticles Bilayers

2021 ◽  
Vol 17 (3) ◽  
pp. 55-70
Author(s):  
Mohammed Kadhum ◽  
Tahseen Mubarak ◽  
Nadia Jassim
Keyword(s):  
Titanium Dioxide ◽  
Optical Properties ◽  
Diffraction Analysis ◽  
Glass Slide ◽  
Hybrid Nanoparticles ◽  
Growth Media ◽  
Fluorescence Measurement ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystal System

The optical properties of the TiO2 / Ag hybrid nanoparticles were improved as the particles were prepared with a pulsed liquid laser ablation (PLAL) technology. The effect of number of pulses (450) on the structural and optical properties of nanoparticles prepared in distilled water (DW) as growth media was examined using a Q-Switched Nd-YAG laser with wavelength (1064 nm), ablation energy (530 mJ) and repetition rate (1Hz). The distance between the target and the lens (10 cm). Several were used for the diagnosis such as X-ray diffraction analysis, fourier infrared transformations, TEM assays and fluorescence of the prepared samples. The results of X-ray diffraction analysis of the silver nanoparticles deposited on a glass slide showed that the crystal system is cubic and polycrystalline, with the direction being dominated by [111] at the level of the crystals. The results of X-ray diffraction analysis of a solution of titanium dioxide nanoparticles deposited on a glass slide revealed the presence of a quadrangular crystal system, indicating the presence of titanium dioxide particles in (rutile), and that the prevailing trend for crystalline levels is [110]. The functional groups of (TiO2 / Ag) were determined in the liquid medium by the (FTIR) technique. Also, TEM images showed the presence of nanoparticles and microparticles in an almost spherical shape. The fluorescence measurement of (TiO2 / Ag) hybrid particles showed that through the graph the peak values of (284.1) and (418.3) nm. This is roughly identical to the absorption spectrum results of a hybrid silver and titanium dioxide nanoparticle solution.

scholarly journals Investigation of the impact of mechanical activation on synthesis of the MgO-TiO2 system

2021 ◽  
pp. 22-22
Author(s):  
Natasa Djordjevic ◽  
Milica Vlahovic ◽  
Sanja Martinovic ◽  
Slavica Mihajlovic ◽  
Nenad Vusovic ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Titanium Dioxide ◽  
Diffraction Analysis ◽  
Mechanical Activation ◽  
High Energy ◽  
Composition Analysis ◽  
X Ray Diffraction ◽  
Magnesium Titanate ◽  
X Ray ◽  
The Impact

In this study, a mixture of magnesium oxide and titanium dioxide was mechanically activated in order to investigate the possibility of mechanochemical synthesis of magnesium titanate. Mechanical activation was performed for 1000 min in a high-energy vibro mill (type MH954/3, KHD Humboldt Wedag AG, Germany). The mill is equipped with housing having a horizontally placed shutter. The cylindrical stainless steel working vessel, with inner dimensions of 40 mm in height and 170 mm in diameter, has working elements consisting of two free concentric stainless steel rings with a total weight of 3 kg. The engine power is 0.8 kW. Respecting the optimal amount of powder to be activated of 50-150 g and the stoichiometric ratio of the reactants in the equation presenting the chemical reaction of magnesium titanate synthesis, the starting amounts were 20.2 g (0.5 mol) of MgO and 39.9 g (0.5 mol) TiO2. During the experiments, X-ray diffraction analysis of the samples taken from the reaction system after 60, 180, 330, and 1000 min of mechanical activation was performed. Atomic absorption spectrophotometry was used for chemical composition analysis of samples taken at different activation times. Based on the X-ray diffraction analysis results, it can be concluded that the greatest changes in the system took place at the very beginning of the mechanical activation due to the disturbance of the crystal structure of the initial components. X-ray diffraction analysis of the sample after 1000 min of activation showed complete amorphization of the mixture, but diffraction maxima characteristic for magnesium titanate were not identified. Therefore, the mechanical activation experiments were stopped. Evidently, the energy input was not sufficient to overcome the energy barrier to form a new chemical compound - magnesium titanate. The failure to synthesize magnesium titanate is explained by the low negative Gibbs energy value of -25.8 kJ/mol (despite the theoretical possibility that the reaction will happen), as well as by the amount of mechanical energy entered into the system during activation which was insufficient to obtain the reaction product. Although the synthesis of MgTiO3 was not achieved, significant results were obtained which identify models for further investigations of the possibility of mechanochemical reactions of alkaline earth metals and titanium dioxide.

Optical and photocatalytic properties of photoactive paper with polycrystalline TiO2 nanopigment for optimal product design

TAPPI Journal ◽  
2012 ◽  
Vol 11 (5) ◽  
pp. 33-38 ◽  
Author(s):  
SEONGHYUK KO ◽  
PAUL D. FLEMING ◽  
MARGARET JOYCE ◽  
PNINA ARI-GUR
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gas Chromatography ◽  
Titanium Dioxide ◽  
Optical Properties ◽  
Photocatalytic Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Optimal Product Design

We investigated the effect of the crystalline phases of titanium dioxide nanopigment to optimize the optical properties and photocatalytic activity for synthesizing a photoactive paper. Six different ratios of anatase to rutile were prepared. Phase change and particle size were characterized using X-ray diffraction and transmission electron microscopy. Optical properties including opacity and brightness were tested. Photocatalytic activity was evaluated by measuring toluene decomposition, using gas chromatography. A specific ratio between two different crystallites of titanium dioxide showed relatively better optical and photoactive properties. The optimal anatase-to-rutile ratio was found to be 0.52:0.48.

scholarly journals Qualitative and Quantitative Phase-Analysis of Undoped Titanium Dioxide and Chromium Doped Titanium Dioxide from Powder X-Ray Diffraction Data

2018 ◽  
Vol 18 (3) ◽  
pp. 486 ◽  
Author(s):  
Hari Sutrisno ◽  
Ariswan Ariswan ◽  
Dyah Purwaningsih
Keyword(s):  
Titanium Dioxide ◽  
Phase Analysis ◽  
Diffraction Data ◽  
Quantitative Phase Analysis ◽  
X Ray Diffraction ◽  
Doped Tio2 ◽  
X Ray ◽  
Crystal System ◽  
Qualitative And Quantitative ◽  
Undoped Tio2

Undoped titanium dioxide (TiO2) and a series of chromium(III) doped TiO2 (Cr-doped TiOfig. 12) with various %wt Cr atom were prepared by a reflux technique. The undoped TiO2 and Cr-doped TiO2 of 1.1, 3.9, 4.4 %wt Cr atom have been successfully analyzed both qualitative and quantitative analysis of powder X-ray diffraction (XRD) data. The qualitative analysis was carried out with the identification of phases in all samples by comparison with Crystallography Open Database (COD) and International Centre for Diffraction Data (ICDD), while the quantitative phase analysis was calculated by reference intensity ratio (RIR) and whole-pattern fitting (Rietveld analysis) methods. The undoped TiO2 consist of three phases: anatase, rutile, and brookite. In the 1.1 %wt Cr-doped TiO2 are detected presenting two phases: anatase (major) and rutile (minor). In the 3.9 %wt Cr-doped TiO2 andin the 4.4 %wt Cr-doped TiO2 consist of anatase as major phase, while CrO2 and TiO2-II phases can be detected as minor phases. The undoped TiO2 was refined in the phase, crystal system and space group of anatase (tetragonal, I41/amd), rutile (tetragonal, P42/mnm) and brookite (orthorhombic, Pbca), while the 1.1 %wt Cr-doped TiO2 was refined based on anatase (tetragonal, I41/amd), rutile (tetragonal, P42/mnm). Finally, in the 3.9 %wt Cr-doped TiO2 and 4.4 %wt Cr-doped TiO2,respectively were refined in the crystal system and space group of anatase (tetragonal, I41/amd).

Synthesis and Characterization of La2Ca2Cu2O7 Compound

1998 ◽  
Vol 12 (23) ◽  
pp. 991-993
Author(s):  
L. K. Kaliyaperumal ◽  
J. Srinivas ◽  
K. Jeyabalan
Keyword(s):  
Diffraction Analysis ◽  
Ambient Pressure ◽  
Lattice Parameters ◽  
Synthesis And Characterization ◽  
Orthorhombic Crystal System ◽  
X Ray Diffraction ◽  
Orthorhombic Crystal ◽  
X Ray ◽  
Crystal System

Synthesis and characterization of La 2 Ca 2 Cu 2 O 7 compound at ambient pressure is reported here. The powder X-ray diffraction analysis shows that the compound crystallizes in an orthorhombic crystal system with lattice parameters a = 5.770(4) Å, b = 5.887(7) Å and c = 27.37(2) Å.

Sintering Effects on Mechanical Properties of Hydroxyapatite-Titanium Dioxide (HA-TiO2) Composites

2006 ◽  
Vol 309-311 ◽  
pp. 355-358 ◽  
Author(s):  
Faik N. Oktar ◽  
Onur Meydanoglu ◽  
Gültekin Göller ◽  
Simeon Agathopoulos ◽  
G. Rocha ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Dioxide ◽  
Diffraction Analysis ◽  
Compression Strength ◽  
Bovine Bone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Densification Behaviour ◽  
Different Temperatures

Composites of bovine bone derived HA with 5 wt% and 10 wt% of TiO2 were sintered at different temperatures. Their characterization comprised measurements of density, microhardness, and compression strength together with SEM observations and X-ray diffraction analysis. Better densification behaviour was achieved at higher sintering temperatures. The highest microhardness value was measured in the samples sintered at 1300°C. The best compressive strengths of the samples containing 5% and 10% TiO2 were obtained after sintering at 1300°C and 1200°C, respectively.

scholarly journals Electric and Optical Properties of Pb(Er1/2Nb1/2)-Pb(Mg1/3Nb1/3)-PbTiO3 Crystals

Crystals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 426 ◽  
Author(s):  
Wei Zhao ◽  
Zengzhe Xi ◽  
Pinyang Fang ◽  
Xiaojuan Li ◽  
Wei Long ◽  
...  
Keyword(s):  
Optical Properties ◽  
Curie Temperature ◽  
Diffraction Analysis ◽  
Coercive Field ◽  
Phase Structure ◽  
Optical Devices ◽  
X Ray Diffraction ◽  
Flux Method ◽  
X Ray ◽  
Curie Temperature Tc

New ferroelectric crystals Pb(Er1/2Nb1/2)-Pb(Mg1/3Nb1/3)O-PbTiO3 (PEN-PMN-PT) were grown by using the flux method. Phase structure of the crystals was described by the X-ray diffraction analysis. Dielectric, ferroelectric and optical properties of the PEN-PMN-PT crystals were investigated systematically. Higher Curie temperature (Tc ~ 291 °C) and larger coercive field (Ec ~ 17.6 kV/cm) for the 40PEN-13PMN-47PT can be obtained, respectively, compared with those of the PMN-PT. Moreover, strong green and red emissions can be excited by using the 980 nm laser. The PEN-PMN-PT crystals with these performances have some promising applications in the electromechanical and optical devices.

Molecular Alignments Studied by X-Ray Diffraction Analysis and Optical Properties of Vacuum-Deposited Thin Films of Thiophene-Pyridine Co-Oligomers

2006 ◽  
Vol 45 (No. 23) ◽  
pp. L598-L601 ◽  
Author(s):  
Akira Kumagai ◽  
Yoshiki Fujiwara ◽  
Hiroki Fukumoto ◽  
Shintaro Sasaki ◽  
Hideomi Koinuma ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molecular Alignments

Synthesis, X-ray diffraction analysis and nonlinear optical properties of hexacoordinated organotin compounds derived from Schiff bases

2014 ◽  
Vol 769 ◽  
pp. 64-71 ◽  
Author(s):  
Blanca M. Muñoz-Flores ◽  
Rosa Santillán ◽  
Norberto Farfán ◽  
Violeta Álvarez-Venicio ◽  
Víctor M. Jiménez-Pérez ◽  
...  
Keyword(s):  
Optical Properties ◽  
Diffraction Analysis ◽  
Schiff Bases ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Organotin Compounds ◽  
X Ray Diffraction ◽  
X Ray

The crystal structure, linear and nonlinear optical properties of 3-Aminonitrobenzene for photonic application — A combined experimental and theoretical investigation

2019 ◽  
Vol 28 (03) ◽  
pp. 1950028
Author(s):  
A. Arputha Latha ◽  
M. Anbuchezhiyan
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Single Crystal ◽  
Diffraction Analysis ◽  
Nonlinear Optical ◽  
Molecular Level ◽  
Nonlinear Optical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Linear And Nonlinear

Optically transparent good quality single crystal of 3-Aminonitrobenzene (3-ANB) was grown by slow evaporation technique using methanol as solvent. The grown crystal was subjected to single crystal X-ray diffraction analysis in order to reveal its cell parameters, crystal structure and space group. Powder X-ray diffraction analysis was carried out in order to verify the crystalline nature. UV-Vis study was carried out to measure the optical transparency of the title material and also optical band gap was determined from the transmittance window. The existence of second harmonic generation (SHG) in the title material was confirmed by Kurtz–Perry powder technique. In order to throw light on the crystal structure, linear and nonlinear optical properties at molecular level, Density Functional Theory (DFT) was employed using B3LYP/6[Formula: see text]G (d, p) level of basis set. The DFT study illustrates the HOMO–LUMO energy gap analysis and the existence of SHG behavior of 3-ANB at molecular level.

Structural and optical properties of Tin Oxide and Indium doped SnO2 thin films deposited by thermal evaporation technique

2016 ◽  
Vol 12 (3) ◽  
pp. 4394-4399
Author(s):  
Sura Ali Noaman ◽  
Rashid Owaid Kadhim ◽  
Saleem Azara Hussain
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Tin Oxide ◽  
Thermal Evaporation ◽  
Pure Sno2 ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Evaporation Technique ◽  
Sno2 Thin Films

Tin Oxide and Indium doped Tin Oxide (SnO2:In) thin films were deposited on glass and Silicon  substrates  by  thermal evaporation technique.  X-ray diffraction pattern of  pure SnO2 and SnO2:In thin films annealed at 650oC and the results showed  that the structure have tetragonal phase with preferred orientation in (110) plane. AFM studies showed an inhibition of grain growth with increase in indium concentration. SEM studies of pure  SnO2 and  Indium doped tin oxide (SnO2:In) ) thin films showed that the films with regular distribution of particles and they have spherical shape.  Optical properties such as  Transmission , optical band-gap have been measured and calculated.

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