scholarly journals Influence of OH−Ion Concentration on the Surface Morphology of ZnO-SiO2Nanostructure

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Jessica Ven G. Tinio ◽  
Key T. Simfroso ◽  
Amber Dea Marie V. Peguit ◽  
Rolando T. Candidato
Keyword(s):  
Electron Microscopy ◽  
Surface Morphology ◽  
Spectroscopic Analysis ◽  
Ion Concentration ◽  
X Ray Diffraction ◽  
Remarkable Change ◽  
X Ray ◽  
Infrared Spectroscopic Analysis ◽  
Surface Capping ◽  
Scanning Electron

The influence of varying OH−ion concentration on the surface morphology of chemically deposited ZnO-SiO2nanostructures on glass substrate was investigated. The morphological features, phase structure, and infrared characteristics were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR), respectively. Results revealed that silica significantly changes the hexagonal morphology of bare ZnO rod to “pointed tips” when using low initial OH−precursor concentration. Increasing OH−ion concentration resulted in a “flower-like” formation of ZnO-SiO2and a remarkable change from “pointed tips” to “hemispherical tips” at the top surface of the rods. The surface capping of SiO2to ZnO leads to the formation of these “hemispherical tips.” The infrared spectroscopic analysis showed the characteristics peaks of ZnO and SiO2as well as the Si-O-Zn band which confirms the formation of ZnO-SiO2. Phase analysis manifested that the formed ZnO-SiO2is of wurtzite structure. Furthermore, a possible growth mechanism is proposed based on the obtained results.

scholarly journals Influence of nickel addition on structural and magnetic properties of aluminium substituted Ni-Zn ferrite nanoparticles

2016 ◽  
Vol 10 (3) ◽  
pp. 161-167 ◽  
Author(s):  
Donta Paramesh ◽  
Katrapally Kumar ◽  
Pendyala Reddy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Frequency Band ◽  
Ferrite Nanoparticles ◽  
Ion Concentration ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Ni-Zn-Al mixed ferrite nanoparticles, with general formula NixZn1-xAlFeO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), were synthesized by sol-gel auto combustion technique. All prepared ferrite nanoparticles were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and vibrating sample magnetometer. X-ray diffraction study confirmed the formation of the single phase cubic spinel structure in all ferrite samples. The crystallite size was calculated by the Debye-Scherrer formula and found to be in the range 15-46 nm. The lattice constant decreased with increasing Ni2+ ion concentration. Scanning electron microscopy images clearly indicate that the particles are very small but agglomerated. Energy dispersive X-ray was used to confirm the composition of the prepared powders. Fourier transform infrared spectra showed two main absorption bands of ferrite nanoparticles, the high frequency band (?1) around 600 cm-1 and the low frequency band (?2) around 400 cm-1 arising from tetrahedral (A) and octahedral (B) interstitial sites in the spinel lattice, respectively. Vibrating sample magnetometer results reported that the saturation magnetization, remanent magnetization and magnetic moments decrease with increasing Ni2+ion concentration.

scholarly journals Studies on the preparation of lead(II) chloride from galvanizing plant wastes

2013 ◽  
Vol 47 (4) ◽  
pp. 415-420 ◽  
Author(s):  
MM Rahman ◽  
AJMT Neger ◽  
A Gafur ◽  
ASW Kurny
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrochloric Acid ◽  
Diffraction Analysis ◽  
Atomic Absorption ◽  
Spectroscopic Analysis ◽  
Lead Chloride ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Galvanizing plant wastes containing 71.82% lead was leached in hydrochloric acid. Lead was precipitated from the leach liquor as lead chloride and purified by recrystallisation. The process parameters like concentration of hydrochloric acid, time of leaching, mode of reaction, number of re-crystallization etc. were optimised. Nearly 70% of lead contained by the waste material could be leached out and converted to lead(II) chloride. The product (PbCl2) was characterised by atomic absorption spectroscopy, thermogravimetric analysis, x-ray diffraction analysis, and scanning electron microscopy. Atomic absorption spectroscopic analysis showed that the product was 93% pure. X-ray diffraction analysis confirmed that the product possess cotunnite phase having orthorhombic structure. The needle like shape of the prepared PbCl2 crystal was confirmed by scanning electron microscopy. Physical properties like melting point and density were also very close to those reported in literature. Bangladesh J. Sci. Ind. Res. 47(4), 415-420, 2012 DOI: http://dx.doi.org/10.3329/bjsir.v47i4.14071

Synthesis, Characterization and Dielectric Properties of Mn(2-x)ZnxP2O7 Ceramics

2013 ◽  
Vol 802 ◽  
pp. 12-16
Author(s):  
Manoon Sutapun ◽  
Rangson Muanghlua ◽  
Surasak Niemcharoen ◽  
Wanwilai C. Vittayakorn ◽  
Panpailin Seeharaj ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Monoclinic Phase ◽  
Ion Concentration ◽  
X Ray Diffraction ◽  
X Ray ◽  
Manganese Zinc ◽  
Ft Ir ◽  
Ir And Raman ◽  
Sintering Method ◽  
Scanning Electron

Manganese zinc pyrophosphate (Mn(2-x)ZnxP2O7 when x = 0.0, 0.5, 1.0, 1.5 and 2.0) ceramics were fabricated by conventionally mixing oxide using the normal sintering method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Raman spectroscopy and scanning electron microscopy (SEM). The XRD results indicated that synthesized Mn(2-x)ZnxP2O7 systems have a pure monoclinic phase without the presence of phase impurities. The lattice parameters and crystalline sizes analyzed from XRD data were changed depending on the amount of added Zn2+ ion concentration in the Mn2P2O7 structure. The FT-IR and Raman results showed the fundamental vibrations of P2O74-ion and Mn-O or Zn-O, which confirmed the Mn(2-x)ZnxP2O7 formation. In addition, dielectric stability of temperature and frequency was observed in the composition, x = 1.0, with a dielectric constant value of 11.5 at 1 MHz.

Nanostructured Morphology of Spinel LiMn2O4 Oxide under Microwave Heating

2014 ◽  
Vol 936 ◽  
pp. 452-458
Author(s):  
Di Huo
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Morphology ◽  
Microwave Heating ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Conditions ◽  
Morphology And Structure ◽  
Scanning Electron

The surface morphology and structure of the cubic stoichiometric spinel LiMn2O4powder prepared by microwave heating were examined using X-ray diffraction, scanning electron microscopy and transmittance electron microcopy. It is shown that the surface morphology of LiMn2O4particle changed with increasing preparing temperature, while the crystal structure kept unchanged. Novel nanostructured morphologies including nanorods and nanowhiskers were formed under appropriate synthesis conditions. The growth mechanism of the nanostructured morphology of spinel LiMn2O4was discussed in accordance with period bonding chains (PBCs) theory.

scholarly journals Структурные превращения в борате железа при высокотемпературном отжиге

2019 ◽  
Vol 89 (8) ◽  
pp. 1229
Author(s):  
С.В. Ягупов ◽  
Н.И. Снегирёв ◽  
К.А. Селезнева ◽  
Е.Т. Милюкова ◽  
Ю.А. Могиленец ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Morphology ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
Iron Borate ◽  
X Ray ◽  
Different Temperatures ◽  
Scanning Electron

Surface morphology and crystal structure of iron borate, FeBO3, annealed at different temperatures, have been studied by scanning electron microscopy and X-ray diffraction analysis. The temperature range of structurally stability of iron borate has been determined. It has been established that in the range of temperatures 800–900°C recrystallization in the iron orthoborate Fe3BO6 phase, and more than 900°C − in α-Fe2O3 phase, occurs.

The Treated Cellulose Micro/Nano Fibers (CMNF) from Bioresources in Malaysia

2016 ◽  
Vol 846 ◽  
pp. 434-439 ◽  
Author(s):  
Fauziah Abdul Aziz ◽  
Ariffin Ismail ◽  
Wan Yunus Wan Md Zin ◽  
Norazman Mohamad Nor ◽  
Risby Mohd Sohaimi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Morphology ◽  
Field Emission ◽  
Alkaline Treatment ◽  
Musa Acuminata ◽  
Ananas Comosus ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Cellulose Micro/Nano fibers (CMNF) from various plants which is Resak (Vatica spp.) waste, Merbau (Intsia bijuga) waste, banana (Musa acuminata) pseudo-stem and pineapple (Ananas comosus) leaf fibers have been isolated and characterized. Isolation of microfibril cellulose from raw fibers was achieved using alkaline treatment and bleaching. The treated and untreated samples were characterized using x-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Characterizations of treated and untreated samples were compared. The comparison between those treated and untreated samples giving different crystallite size, crystallinity, arrangement of CMNF and surface morphology from different plants. Hence, with these information different nanocomposite from CMNF can be constructed and manipulated for various application.

The Synthesis of Polycrystalline Chalcopyrite Semiconductors by Microwave Irradiation

1993 ◽  
Vol 327 ◽  
Author(s):  
Christopher C. Landry ◽  
Andrew R. Barron
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Surface Morphology ◽  
Microwave Irradiation ◽  
Photoelectron Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Edx Analysis ◽  
Chalcopyrite Semiconductors ◽  
Scanning Electron

AbstractPolycrystalline samples of the chalcopyrites CuInS2, CuInSe2, AgInS2, and AgInSe2 have been prepared from stoichiometric mixtures of the pure elements using microwave irradiation. The reactions were performed in sealed quartz tubes in as few as three minutes. The products were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, and X-ray photoelectron spectroscopy (XPS). The surface morphology and shape of the particles produced by this method suggests that the products are formed from liquid melts.

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

Environmental scanning electron microscopy of fresh human gallstones reveals new morphologies of precipitated calcium salts

1992 ◽  
Vol 50 (2) ◽  
pp. 1322-1323
Author(s):  
Howard S. Kaufman ◽  
Keith D. Lillemoe ◽  
John T. Mastovich ◽  
Henry A. Pitt
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Environmental Scanning Electron Microscopy ◽  
Environmental Scanning ◽  
X Ray Diffraction ◽  
Calcium Salts ◽  
Cholesterol Gallstones ◽  
X Ray ◽  
Ca Carbonate ◽  
Scanning Electron

Gallstones contain precipitated cholesterol, calcium salts, and proteins. Calcium (Ca) bilirubinate, palmitate, phosphate, and carbonate occurring in gallstones have variable morphologies but characteristic windowless energy dispersive x-ray (EDX) spectra. Previous studies of gallstone microstructure and composition using scanning electron microscopy (SEM) with EDX have been limited to dehydrated samples. In this state, Ca bilirubinates appear as either glassy masses, which predominate in black pigment stones, or as clusters, which are found mostly in cholesterol gallstones. The three polymorphs of Ca carbonate, calcite, vaterite, and aragonite, have been identified in gallstones by x-ray diffraction, however; the morphologies of these crystals vary in the literature. The purpose of this experiment was to study fresh gallstones by environmental SEM (ESEM) to determine if dehydration affects gallstone Ca salt morphology.Gallstones and bile were obtained fresh at cholecystectomy from 6 patients. To prevent dehydration, stones were stored in bile at 37°C. All samples were studied within 4 days of procurement.

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