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Search Results: 1 - 10 of 17384 matches for " Crystal Structure "
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Synthesis of Crystalline Ag Nanoparticles (AgNPs) from Microorganisms  [PDF]
Seema Sharma, Naheed Ahmad, Anuradha Prakash, Vidya Nand Singh, Ashok Kumar Ghosh, Bodh Raj Mehta
Materials Sciences and Applications (MSA) , 2010, DOI: 10.4236/msa.2010.11001
Abstract: Bacteria obtained from the isolates of the biodiversity of riverine coast of Ganga identified as Bacillus Koriensis, when challenged with silver nitrate solution accumulated silver nanoparticles on the surface of its cell wall. These nanoparticles showed an absorption peak at 438 nm in UV-visible spectrum corresponding to the plasmon resonance of AgNPs. The transmission electron micrographs of nanoparticles in aqueous solution showed the production of reasonably monodisperse AgNPs (average particle size: 9.92 ± 1.311 nm) by the bacteria. X-ray diffraction spectrum of the nanoparticles confirmed the formation of metallic silver.
Interfacial control on microstructure, morphology and optics of beta-AgI nanostructures fabricated on sputter-disordered Ag-Sn bilayers  [PDF]
D. Bharathi Mohan, C. S. Sunandana
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.24044
Abstract: We report for the first time a non-template based facile growth of hexagonal (β) AgI nanorods and nanoplates easily fabricated by rf magnetron sputtering on Ag/Sn bilayers upon controlled iodination. The structural and morphological evolution of the β-AgI nanostructures is cha-racterized by X-Ray Diffraction, Atomic Force Microscopy and optical spectroscopy. Sput-tering induced disorder in precursor Ag films, high external stress and high defect concentra-tions at the Sn-AgI interface particularly facili-tates the development of layered hexagonal structure of β-AgI nanostructures. Extremely sensitive room temperature optical absorbance involving evolution of W1,2 and W3 exciton tran-sitions and emission spectra involving phonon replica corroborate the formation of β-AgI na-nostructures with high defect concentrations, are aimed at improving the efficiency of photo-graphic process and looking at microelec-trodic and optoelectronic applications.
Lead Iodide Crystals as Input Material for Radiation Detectors  [PDF]
Sunil Kumar Chaudhary
Crystal Structure Theory and Applications (CSTA) , 2012, DOI: 10.4236/csta.2012.13004
Abstract: Lead iodide is an important inorganic solid for fundamental research and possible technological applications and is considered to be a potential room temperature nuclear radiation detector. In lead iodide the phenomenon of polytypism is posing an interesting problem of phase transformations amongst its various polytypic modifications. The transformations have also been observed even when the crystals are stored for few months. It causes deterioration in functioning of PbI2 devices. Taking into account the known structures of PbI2 and the data available on the mode of growth and storage of crystals, it has been concluded that purified melt grown crystals of PbI2 are the best suited for nuclear radiation detectors.
Crystal Structure of 3-Amino-5,6-Dimethyl-2-Nitrobiphenyl-4-Carbonitrile  [PDF]
Wanqiang Zhang
Crystal Structure Theory and Applications (CSTA) , 2013, DOI: 10.4236/csta.2013.23016

A kind of polysubstituted benzene, 3-amino-5,6-dimethyl-2-nitrobiphenyl-4-carbonitrile(C15H13N3O2), was synthesized and its crystal structure was determined. The molecule is composed of two phenyl moieties, two methyl groups, a cyano group, an amino group and a nitro group. The methyl groups, cyano group and amino group are nearly coplanar with the connected benzene ring. Because of the large volume, the nitro group and the connected benzene ring are twisted. The dihedral angle between the two benzene rings is 83.51°. In the crystal, molecules are linked by N—H···N and C—H···O hydrogen bonds.

A Hirshfeld Surface Analysis and Crystal Structure of 2’-[1-(2-Fluoro-Phenyl)-1H-tetrazol-5-Yl]-4-Methoxy-Biphenyl-2-Carbaldehyde  [PDF]
S. Madan Kumar, B. C. Manjunath, G. S. Lingaraju, M. M. M. Abdoh, M. P. Sadashiva, N. K. Lokanath
Crystal Structure Theory and Applications (CSTA) , 2013, DOI: 10.4236/csta.2013.23017

The title compound, C21H15FN4O2 is synthesized and characterized by 1H NMR, LC-MS and finally confirmed by single crystal X-ray diffraction method. This molecule crystallizes in the monoclinic crystal system and space group P21/c, with crystal parameters a = 9.4386(5) A, b = 20.8082(1) A, c = 9.4338(6) A, β = 99.566(2)0, Z = 4 and V = 1826.98(19) A3. The mean planes of fluro-phenyl moiety makes a dihedral angle of 21.51 (7)

Study of the Crystallographic and Magnetic Structure in the Nickel Substituted Cobalt Ferrites by Neutron Diffraction  [PDF]
Sadia Khanam, A. K. M. Zakaria, M. H. Ahsan, T. K. Datta, S. Aktar, S. I. Liba, S. Hossain, A. K. Das, I. Kamal, S. M. Yunus, D. K. Saha, S.-G. Eriksson
Materials Sciences and Applications (MSA) , 2015, DOI: 10.4236/msa.2015.64038
Abstract: The polycrystalline spinel oxides NiX?Co1-X?Fe2O4 with composition x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 were prepared by conventional solid state ceramic sintering technique in air at 1300°C. X-ray diffraction experiments were carried out on all the samples at room temperature in order to characterize the materials. X-ray diffraction patterns showed sharp peaks indicating the formation of single phase cubic spinel structure. The neutron diffraction experiments were performed on all samples at room temperature, with an incident monochromatic neutron beam of wavelength λ = 1.5656 Å. The experimental neutron diffraction data were analyzed using the computer program FullProf in the Reitveld method. Reitveld refinement of the neutron diffraction data reveals that the samples possess cubic symmetry corresponding to the space group F d-3m. Cation distribution between the two sublattices of the spinel structure has been found from the analysis of the neutron diffraction data. Lattice parameters, oxygen position parameters, and overall temperature factors have also been determined from the analysis of neutron diffraction data. The lattice parameter decreases and oxygen position parameter increases with increasing Ni content in the system. Sublattices and net magnetic moments have been determined from the refinement of neutron diffraction data. The magnetic structure at room temperature was found to be ferrimagnetic for all the samples.
Crystal structure of Q156A trichosanthin
Yicheng Dong,Yuerong Zhu,Shizhi Cheng,Jianhui Li,Pangchui Shaw
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02882868
Synthesis and crystal structure of dodecatungstic acid with icosahedron
Xiaoming Lu,Shuncheng Liu,Churchill Melvyn
Chinese Science Bulletin , 1997, DOI: 10.1007/BF03182616
Influences of Silver-Doping on the Crystal Structure, Morphology and Photocatalytic Activity of TiO2 Nanofibers  [PDF]
Nasser A. M. Barakat, Muzafar A. Kanjwal, Salem S. Al-Deyab, Ioannis S. Chronakis
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.29160
Abstract: Doping of titanium dioxide nanofibers by silver nanoparticles revealed distinct improvement in the photocatalytic activity; however other influences have not been investigated. In this work, effect of sliver-doping on the crystal structure, the nanofibrous morphology as well as the photocatalytic activity of titanium oxide nanofibers has been studied. Silver-doped TiO2 nanofibers having different silver contents were prepared by calcination of electrospun nanofiber mats consisting of silver nitrate, titanium isopropoxide and poly(vinyl acetate) at 600℃. The results affirmed formation of silver-doped TiO2 nanofibers composed of anatase and rutile when the silver nitrate content in the original electrospun solution was more than 3 wt%. The rutile phase content was directly proportional with the AgNO3 concentration in the electrospun solution. Negative impact of the silver-doping on the nanofibrous morphology was observed as increase the silver content caused to decrease the aspect ratio, i.e. producing nanorods rather nanofibers. However, silver-doping leads to modify the surface roughness. Study of the photocatalytic degradation of methylene blue dye clarified that increase the silver content strongly enhances the dye oxidation process.
Crystal structure, thermal analysis and IR spectroscopic investigation of bis (N-methyl anilinium) sulfate  [PDF]
Taha Guerfel, Amor Jouini
Open Journal of Inorganic Chemistry (OJIC) , 2011, DOI: 10.4236/ojic.2011.13007
Abstract: Chemical preparation, X-ray single crystal, thermal analysis and IR spectroscopic investigation of (C7H10N)2 SO4 denoted NMAS are described. The NMAS crystallizes in the triclinic system with P-1 space group. Its unit cell dimensions are a = 9.6150(5) Å, b = 9.9744(3) Å, c = 10.2767(6) Å, α = 68.069(3)°, β = 62.929(2)°, γ = 67.285(3)° with V = 785.72(7) Å3 and Z = 2. The structure has been solved using direct method and refined to a reliability R factor of 3.62%. The NMAS structure is built up from chains containing all the components of the structure and parallel to the b axis, linked via N—H­­­­­···O hydrogen bonds. Stability between successive chains is performed by weak interactions originating from the organic cations.
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