scholarly journals Infrared Radiation Assisted Stokes’ Law Based Synthesis and Optical Characterization of ZnS Nanoparticles

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Beer Pal Singh ◽  
Ravish Kumar Upadhyay ◽  
Rakesh Kumar ◽  
Kamna Yadav ◽  
Hector I. Areizaga-Martinez
Keyword(s):  
Infrared Radiation ◽  
Zinc Nitrate ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Zns Nanoparticles ◽  
Ir Radiation ◽  
Phase Crystal ◽  
Free Body ◽  
Quiescent Fluid

The strategy and technique exploited in the synthesis of nanostructure materials have an explicit effect on the nucleation, growth, and properties of product materials. Nanoparticles of zinc sulfide (ZnS) have been synthesized by new infrared radiation (IR) assisted and Stokes’ law based controlled bottom-up approach without using any capping agent and stirring. IR has been used for heating the reaction surface designed in accordance with the well-known Stokes law for a free body falling in a quiescent fluid for the synthesis of ZnS nanoparticles. The desired concentration of aqueous solutions of zinc nitrate (Zn(NO3)2·4H2O) and thioacetamide (CH3CSNH2) was reacted in a controlled manner by IR radiation heating at the reaction area (top layer of reactants solution) of the solution which results in the formation of ZnS nanoparticles at ambient conditions following Stokes’ law for a free body falling in a quiescent fluid. The phase, crystal structure, and particle size of as-synthesized nanoparticles were studied by X-ray diffraction (XRD). The optical properties of as-synthesized ZnS nanoparticles were studied by means of optical absorption spectroscopic measurements. The optical energy band gap and the nature of transition have been studied using the well-known Tauc relation with the help of absorption spectra of as-synthesized ZnS nanoparticles.

Template Assisted Growth of Zinc Oxide-Based Nanowires and Piezoelectric Properties

2013 ◽  
Vol 829 ◽  
pp. 757-761 ◽  
Author(s):  
Nooshin Sadat Ayati ◽  
Elahe Akbari ◽  
Seyed Pirooz Marashi ◽  
Shahyar Saramad
Keyword(s):  
Zinc Oxide ◽  
Zinc Nitrate ◽  
Zno Nanowires ◽  
Structure Characterization ◽  
X Ray Diffraction ◽  
Contact Mode ◽  
Oxide Nanowires ◽  
Nitrate Precursor ◽  
Potentiostatic Electrodeposition

In this paper, we report on the synthesis of ZnO nanowires via templated electrochemical deposition. ZnO nanowire arrays were fabricated by potentiostatic electrodeposition in track-etched polycarbonate (PC) membrane. The electrolyte was aqueous solution containing zinc nitrate precursor. The electrodeposition process involves the electroreduction of nitrate ions to alter the local pH and precipitation of the metal oxide within the pores. The morphology analysis and structure characterization of the ZnO nanowires were carried out using conventional scanning electron microscopy (SEM) and X-Ray diffraction. To check the piezoelectric characteristics of the zinc oxide nanowires, the AFM microscope is used in contact mode. The scanned area was 5µm*5µm and the affected force was 30nN. In result of scanning each nanowire with conductive AFM tip in contact mode, a current peak which had a width smaller than topography peak was fabricated. This is due to semi-conductivity and piezoelectricity characteristics of Nanowires.

Microwave-Assisted Synthesis and Characterization of Zinc Oxide Micropowder

2010 ◽  
Vol 93-94 ◽  
pp. 643-646
Author(s):  
Pusit Pookmanee ◽  
Supasima Makarunkamol ◽  
Sakchai Satienperakul ◽  
Jiraporn Kittikul ◽  
Sukon Phanichphant
Keyword(s):  
Zinc Oxide ◽  
Radiation Power ◽  
Ammonium Hydroxide ◽  
Zinc Nitrate ◽  
Hexagonal Structure ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted

Zinc oxide micropowder was synthesized by a microwave-assisted method. Zinc nitrate and ammonium hydroxide were used as the starting precursors with the mole ratio of 1:1. The white precipitated powder was formed after adding ammonium hydroxide until the pH of final solution was 9 and treated with the microwave radiation power at 1000 Watt for 2-6 min. The phase of zinc oxide micropowder was examined by X-ray diffraction (XRD). A single phase of hexagonal structure was obtained. The morphology and chemical composition of zinc oxide micropowder were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The particle was plate-like in shape with the range of particle size of 0.1-0.5 µm. The elemental composition of zinc oxide showed the characteristic X-ray energy value as follows: zinc of Lα = 1.012 keV, Kα = 8.630 keV and Kβ = 9.570 keV and oxygen of Kα = 0.525 keV, respectively.

Characterization of Nickel-Zinc Ferrite Powder Prepared via Sol-Gel Technique in between 100 MHz to 2 GHz

2013 ◽  
Vol 465-466 ◽  
pp. 824-828
Author(s):  
See Khee Yee ◽  
Sia Chee Kiong ◽  
Zarar bin Mohd Jenu Mohd
Keyword(s):  
Electromagnetic Interference ◽  
Zinc Ferrite ◽  
Sol Gel ◽  
Zinc Nitrate ◽  
Dielectric Measurement ◽  
Ferrite Powder ◽  
X Ray Diffraction ◽  
Nickel Zinc ◽  
Absorbing Material

Electromagnetic Interference (EMI) issue is gaining more attention as the result of proliferation of electrical and electronic devices. In order to reduce the exposure to EMI, shielding and absorbing materials are often applied. This paper discussed the process of forming the nickel-zinc ferrite as one of the absorbing material by mixing the nickel nitrate, zinc nitrate and iron (III) nitrate together. X-ray diffraction, scanning electron microscopy, and dielectric measurement are carried out to reveal the characteristic of the specimen. The sintering temperature determines the formation of a pure spinal nickel-zinc ferrite and grain size.

Bio-Inspired Mineralization from Aqueous Solutions of Zinc Nitrate Directed by Building Blocks of DNA

2007 ◽  
Vol 1008 ◽  
Author(s):  
Micha Jost ◽  
Peter Gerstel ◽  
Joachim Bill ◽  
Fritz Aldinger
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Building Blocks ◽  
Zinc Nitrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dna And Rna ◽  
Scanning Electron

AbstractIn this paper, the suitability of DNA- and RNA-bases, nucleosides and nucleotides, and DNA itself as structure-directing agents for the mineralization of ZnO-based materials is discussed. Those bioorganic molecules are able to trigger the morphology of mineralization products ranging from smooth, homogenous thin films to sponge-like, sheet-like and fibrous products. Besides the investigation of morphological features by scanning electron microscopy, the structural characterization of these materials by X-ray diffraction, vibrational spectroscopy, photoluminescence spectroscopy and photoelectron spectroscopy is discussed.

scholarly journals STUDYING THE EFFECT OF POLYVINYLPYRROLIDONE (PVP) ON CHARACTERIZATION OF ZNO NANOPARTICLES SYNTHESIZED BY SOL – GEL METHOD

2018 ◽  
Vol 18 (3) ◽  
pp. 460-469
Author(s):  
Shaima'a J Kareem
Keyword(s):  
Sol Gel ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Distilled Water ◽  
X Ray Diffraction ◽  
Zno Nps ◽  
Absorption Bands ◽  
Ft Ir ◽  
Scanningelectron Microscopy

In this paper, studying synthesis zinc oxide nanoparticles (ZnO NPs) via sol - gel methodand effect of adding polymer in preparation its solution. Zinc nitrate hexahydrate,Polyvinylpyrrolidone PVP, distilled water and sodium hydroxide (NaOH) were used asprecursor materials. Crystallization behavior of the ZnO was studied by X-ray diffraction(XRD). Nanoparticles phases can change from amorphous to wurtzite structure at thecalcination temperature (500 °C) and crystallite size by Scherrer’s formula about (21.131)nm for samples prepared with distilled water and (20.035)nm for samples prepared withdissolved PVP. Morphological and structural properties were investigated by scanningelectron microscopy (SEM). FT-IR spectra was indicated characteristic absorption bands ofZnO. UV-Vis absorption spectrum was shown a typical spectrum for ZnO nanoparticles.Finally, the results were shown the samples with dissolved PVP has smaller particles size,less agglomeration and narrow distribution but less purity phase when compared withsamples prepared with distilled water.

The location and analysis of melanins in the cell walls of some soil fungi

1974 ◽  
Vol 20 (10) ◽  
pp. 1379-1386 ◽  
Author(s):  
D. H. Ellis ◽  
D. A. Griffiths
Keyword(s):  
Cell Walls ◽  
Soil Fungi ◽  
Degradation Products ◽  
Published Data ◽  
X Ray Diffraction ◽  
Ir Radiation ◽  
X Ray ◽  
Ultrathin Sections ◽  
Plant Sources

Electron-dense particles of melanin were located in ultrathin sections of: the hyphal walls of Amorphotheca resume; the aleuriospore walls of Epicoccum nigrum and Humicola grisea; the sclerotial walls of Colletotrichum coccodes; and both within and between the microsclerotial cell walls of Verticillium dahliae. Melanin was extracted with KOH from each of the fungi, but, because of rapid oxidation of the pigment in air, extraction and analysis was carried out under nitrogen. The pigments were examined spectrophotometrically under UV and IR radiation and by means of x-ray diffraction. Characterization of the melanin in terms of its degradation products indicated it to be indolic in nature. These results are compared with published data on other melanins extracted from animal and plant sources.

Chemical Synthesis and Characterization of ZnTiO3 Powder Prepared by the Coprecipitation Oxalate Method

2008 ◽  
Vol 55-57 ◽  
pp. 65-68 ◽  
Author(s):  
Pusit Pookmanee ◽  
J. Yotasing ◽  
Sukon Phanichphant
Keyword(s):  
Ammonium Hydroxide ◽  
Zinc Nitrate ◽  
Deionized Water ◽  
Synthesis And Characterization ◽  
Cubic Phase ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
Zinc Titanate ◽  
X Ray

Zinc titanate (ZnTiO3) powder was prepared by the coprecipitation oxalate method. Zinc nitrate and titanium (IV) isopropoxide were used as the starting materials with the mole ratio of Zn:Ti was 1:1. Oxalic acid and ammonium hydroxide were added into the mixed solution. Precipitated powder was obtained after the final pH of solution was 5. The fined powder was washed with deionized water, filtered, dried at 100 oC for 2h, and followed by the calcination at 500, 700 and 900 oC for 2h. The phase of ZnTiO3 powder was studied by X-ray diffraction (XRD). The morphology was characterized by scanning electron microscopy (SEM). Hexagonal and cubic phase of ZnTiO3 powder were obtained after calcination at 900 oC. The particle size of ZnTiO3 powder was in the range of 0.1-0.5 µm with irregular in shape and agglomerated. The chemical

Synthesis and Characterization of Zn-Carboxylate Metal–Organic Frameworks Containing Triazatruxene Ligands

2019 ◽  
Vol 72 (10) ◽  
pp. 786 ◽  
Author(s):  
Adil Alkas ◽  
Shane G. Telfer
Keyword(s):  
Gas Adsorption ◽  
Metal Organic Frameworks ◽  
Zinc Nitrate ◽  
X Ray Diffraction ◽  
Cubic Crystal ◽  
X Ray ◽  
Metal Organic ◽  
Zinc Clusters ◽  
Solvothermal Conditions

Reactions between triazatruxene-based tricarboxylate ligands, H3tat-R, and zinc nitrate under solvothermal conditions afforded new metal–organic frameworks (MOFs) with the general formula [Zn3(tat-R)2(H2O)2], MUF-tat-R (R=a hydrocarbon substituent on the triazatruxene nitrogen atoms). Single-crystal X-ray diffraction analysis revealed that these frameworks are 3D networks with a (10,3)-a topology. Linear trinuclear zinc clusters are connected to tat ligands to form chiral channels that accommodate the substituents on the tat ligands. MUF-tat and MUF-tat-benzyl crystallize in a cubic crystal system whereas MUF-tat-butyl and MUF-tat-hexyl are tetragonal. MUF-tat-benzyl retains its porosity on activation, which was confirmed by gas adsorption studies.

scholarly journals Crystal structure and characterization of magnesium carbonate chloride heptahydrate

2020 ◽  
Vol 76 (8) ◽  
pp. 741-745
Author(s):  
Christine Rincke ◽  
Horst Schmidt ◽  
Gernot Buth ◽  
Wolfgang Voigt
Keyword(s):  
Crystal Structure ◽  
Magnesium Carbonate ◽  
Chloride Ions ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Monoclinic Crystal ◽  
Monoclinic Crystal Structure ◽  
Structure Solution ◽  
Concentrated Solution

MgCO3·MgCl2·7H2O is the only known neutral magnesium carbonate containing chloride ions at ambient conditions. According to the literature, only small and twinned crystals of this double salt could be synthesised in a concentrated solution of MgCl2. For the crystal structure solution, single-crystal diffraction was carried out at a synchrotron radiation source. The monoclinic crystal structure (space group Cc) exhibits double chains of MgO octahedra linked by corners, connected by carbonate units and water molecules. The chloride ions are positioned between these double chains parallel to the (100) plane. Dry MgCO3·MgCl2·7H2O decomposes in the air to chlorartinite, Mg2(OH)Cl(CO3)·nH2O (n = 2 or 3). This work includes an extensive characterization of the title compound by powder X-ray diffraction, thermal analysis, SEM and vibrational spectroscopy.

Production and Characterization of Zinc Substituted Hydroxyapatite

2007 ◽  
Vol 361-363 ◽  
pp. 159-162 ◽  
Author(s):  
David Shepherd ◽  
Serena Best
Keyword(s):  
Mechanical Test ◽  
Ammonium Phosphate ◽  
Zinc Content ◽  
Rietveld Analysis ◽  
Lattice Parameter ◽  
Zinc Nitrate ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray

Zinc substituted hydroxyapatite of varying wt% was produced using a precipitation method based on reacting calcium and zinc nitrate with ammonium phosphate. Characterisation results from X-ray diffraction (XRD) and X-ray fluorescence spectroscopy (XRF) showed that zinc was successfully substituted up to 0.8wt% using this method. Rietveld analysis showed that the alattice parameter was reduced and c-lattice parameter was increased with increasing zinc content. Initial mechanical test results showed samples with a zinc content of 0.4% had the greatest compressive strength.

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