Influence Of Zinc Concentration Research Articles

Facile growth of kesterite CZTS film by one-pot hydrothermal route using EDTA as complex agent for heterojunction solar cell applications: influence of zinc concentration

Facile growth of kesterite CZTS film by one-pot hydrothermal route using EDTA as complex agent for heterojunction solar cell applications: influence of zinc concentration

Some remarks on the paper “Influence of zinc concentration on band gap and sub-band gap absorption on ZnO nanocrystalline thin films sol-gel grown” by Munirah, Ziaul Raza Khan, Anver Aziz, Mohd. Shahid Khan, M.U. Khandaker [Mater. Sci-Poland, 35 (1) 2017, 246 – 253

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Influence of zinc concentration on band gap and sub-band gap absorption on ZnO nanocrystalline thin films sol-gel grown

Abstract ZnO thin films were fabricated on quartz substrates at different zinc acetate molar concentrations using sol-gel spin coating method. The samples were characterized using X-ray diffraction, field emission scanning electron microscope, UV-Vis spectroscopy, FT-IR spectroscopy and photoluminescence spectroscopy. Sub-band gap absorption of ZnO thin films in the forbidden energy region was carried out using highly sensitive photothermal deflection spectroscopy (PDS). The absorption coefficients of ZnO thin films increased in the range of 1.5 eV to 3.0 eV, upon increasing zinc concentration. The optical band gaps were evaluated using Tauc’s plots and found to be in the range of 3.31 eV to 3.18 eV. They showed the red shift in the band edge on increase in zinc concentration. The PL spectra of ZnO thin films revealed the characteristic band edge emission centered at the 396 nm along with green emission centered at the 521 nm.

Influence of zinc concentration on structure, complex permittivity and permeability of Ni–Zn ferrites at high frequency

Polycrystalline soft magnetic nickel–zinc ferrites with chemical composition Ni1−xZnxFe2O4, where x=0, 0.2, 0.4, 0.6, 0.65, 0.7, 0.75, and 0.8, were prepared by solid state reaction method. We researched the effect of zinc concentration on the lattice parameter, crystal morphology and electromagnetic properties at high frequency. Results show that ε′ and ε″ decline with increasing frequency until they reach almost constants over 3MHz to 1GHz. The dielectric constant achieves a maximum when the Zn concentration is 0.8. The value of ε′ slightly declines with increasing frequency in the range of 2–18GHz. The spectra of the permeability displays a relaxation resonance for the ferrites with x=0, 0.2, and 0.4 in 3MHz to 1GHz frequency range. The permeability is ruled by Snoek's law, which results in the values of μ′ decreased fast below 2GHz and smaller than 1 above 2GHz. The value of μ′ reaches maximum and μ″ shows minimum for the samples around x=0.75 in 2–18GHz range. The magnetic permeability μ′ decreases in an external magnetic field, and shows two resonance peaks corresponding to domain wall and spin rotation resonance. The resonance peaks shift to higher frequency with increasing the external magnetic field. But the permeability has no clear response for magnetic field when zinc concentration is much higher.

Microstructural and antibacterial properties of zinc-substituted cobalt ferrite nanopowders synthesized by sol-gel methods

Zinc-substituted cobalt ferrite nanopowders were prepared via a sol-gel route using citric acid as a chelating agent. The influence of zinc concentration on the microstructure, crystal structure, surface wettability, surface roughness, and antibacterial property of zinc-substituted cobalt ferrite nanopowders was investigated systematically. The substitution of zinc influences slightly the microstructure, surface wettability, surface roughness, and crystal structure but strongly affects the antibacterial property of the cobalt ferrite nanopowders.

Short-range structure and in vitro behavior of ZnO–CaO–P2O5 bioglasses

Ternary zinc–calcium-phosphate glasses prepared by classical melting method were characterized through X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) along with energy dispersive X-ray analysis (EDAX), Fourier Transform InfraRed (FTIR) and Raman spectroscopy. The study of these glasses was done in order to supply information regarding their structural particularities since the zinc role in biological environment, especially in the bone, is still under debate.XRD analysis confirmed the vitreous character of the as-prepared samples, while SEM and EDAX measurements indicated the presence of some non-homogeneous domains on their surfaces with approximately similar elemental composition. According to FTIR and Raman spectroscopy, the local structure of glasses up to 10mol% ZnO is mainly built by Q2 tetrahedrons connected by P–O–P linkages. For 50mol% ZnO, the modifier role of zinc ions is strongly reflected on the local structure dominated in this case by Q1 pyrophosphate units.The surface reactivity of the samples has been analyzed in vitro by immersion in simulated body fluid (SBF) at 37°C. XRD, SEM–EDAX, FTIR and Raman methods were employed to characterize the structural changes that occurred on the surface of ZnO–CaO–P2O5 samples reacting with SBF. The X-ray diffraction patterns demonstrated the formation of a hydroxyapatite layer on the samples surface while the other used methods didn't reveal concisely that phenomenon. Based on X-ray measurements, the influence of zinc concentration on the hydroxyapatite layer development was followed.

Effect of Zinc Substitution on Microstructure and Antibacterial Properties of Cobalt Ferrite Nanopowders Synthesized by Sol-Gel Methods

Zinc substituted cobalt ferrite nanopowders with the general formula Co(1-x)ZnxFe2O4(with x = 0, 0.3, 0.5, 0.7, and 1) were prepared via the sol-gel route using citric acid as a chelating agent. The influence of zinc concentration on the microstructure, crystal structure and antibacterial property of zinc substituted cobalt ferrite nanopowders has been systematically investigated. The microstructure and elemental composition were characterized using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX), respectively. Phase analysis of cobalt ferrite nanopowders was performed using X-ray diffractometry (XRD). The antibacterial properties of zinc substituted cobalt ferrite nanopowders were investigated. The results indicate that the substitution of zinc influences strongly the microstructure, crystal structure and antibacterial property of the cobalt ferrite nanopowders.

Cu-Zn合金引抜材の繊維組織形成

The influence of zinc concentration and drawing ratio of brass rods on the forming process of the drawing texture has been investigated by means of the determination of X-ray pole figures and the orientation distribution functions, and by transmission electron microscopy.The 〈511〉 twin component parallel to the drawing direction increases with the increase in zinc concentration and drawing ratio, and these mechanical twins are fine lamellae and consist of locally developing selected areas in the 〈111〉 orientation region. Consequently it is scarcely expected that the 〈100〉 orientation is developed by the slip rotation from the 〈511〉 twin component, because the twin component area is a microscopically laminated structure composed of alternate layers of 〈511〉 orientation and 〈111〉 preferred orientation, and the normal slip rotation toward the 〈100〉 component is disturbed by the competition of active slip systems.

Influence of zinc concentration in nutrient solution on growth and elemental content of the “Katahdin” potato plant

Hoagland’s solutions containing nine levels of zinc ranging from 0 to 50 ppm were applied as a drench tri-weekly to potato plants (cultivar Katahdin) growing in perlite. Although no deficiency symptoms were observed during the 46-day growing period, varying degrees of toxicity were associated with solution concentrations of 25 ppm Zn and higher. The tissue concentration necessary to induce toxicity symptoms appeared to fall between 648 and 932 ppm Zn, with an indication that growth may be reduced at tissue concentrations less than 648 ppm. Solution concentrations in excess of 20 ppm Zn caused a significant reduction in dry weight of top, root and rhizome portions, and number of secondary rhizomes. Increasing Zn treatment concentrations influenced elemental tissue content as follows: Al, Ca, Mn, Mo and Zn increased, B increased only at 40 ppm Zn or above, N and K decreased and P, Mg and Fe contents were generally decreased by the addition of Zn. Cu content was unaffected.