scholarly journals Preparation and Characterization of Polymer Composite Materials Containing Magnetite

2021 ◽  
Vol 15 ◽  
pp. 1421-1428
Author(s):  
E. R. Sadretdinova ◽  
Thant Zin Hein
Keyword(s):  
Electron Microscopy ◽  
Phase Composition ◽  
Composite Materials ◽  
Ir Spectroscopy ◽  
Polymer Processing ◽  
Flow State ◽  
Standard Methods ◽  
Composition And Structure ◽  
Polyethylene Melt

In this work, magnetite nanoparticles are introduced into a polyethylene melt at the stage of a viscous-flow state by standard methods of polymer processing (extrusion), which makes it possible to obtain a nanocomposite with a uniform nanofiller distribution. The phase composition and structure of the nanocomposite were confirmed by XRF, electron microscopy, and IR spectroscopy. It is shown that the preparation of Fe3O4/LLDPE nanocomposites is not complicated by the appearance of unidentified phases and changes in the structure of the polymer matrix.

Phase composition and morphological analysis of human gallstones using IR spectroscopy, scanning electron microscopy and X-ray Rietveld analysis

2016 ◽  
Vol 231 (2) ◽  
Author(s):  
Samiran Pramanik ◽  
Soumen Ghosh ◽  
Arkaprovo Roy ◽  
Ramanuj Mukherjee ◽  
Alok Kumar Mukherjee
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phase Composition ◽  
Ir Spectroscopy ◽  
Rietveld Analysis ◽  
Quantitative Phase Analysis ◽  
Human Gallbladder ◽  
X Ray ◽  
Quantitative Phase ◽  
Scanning Electron

AbstractQuantitative phase composition and morphological characterization of 12 human gallbladder stones (GS1–GS12) retrieved from patients of eastern India have been carried out using IR-spectroscopy, powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM). The FTIR spectra indicated that the primary composition of gallstones studied was cholesterol. X-ray powder diffraction study revealed cholesterol monohydrate (CHM) as the major crystalline phase in GS1–GS12. The Rietveld analysis showed that nine of the gallstones were composed exclusively of CHM, while the remaining three stones contained in addition to CHM, small amounts (4.2–10.6 wt%) of calcium carbonate as aragonite and vaterite. The crystallite size of CHM in GS1–GS12 varied between 82(6) and 249(3) nm. The SEM images of gallstones showed different crystal habits of CHM such as plates, thin rods, rectangular and hexagonal blocks, which resulted into different levels of agglomeration at the mesoscopic scale. Presence of numerous parasitic eggs with a typical muskmelon surface in three gallstones (GS2, GS7 and GS9) suggests possible association between the liver fluke infection and biliary stone formation in these patients. To the best of our knowledge, the study constitutes the first report of X-ray quantitative phase analysis of gallstones using the Rietveld methodology.

Characterization of banana peel by scanning electron microscopy and FT-IR spectroscopy and its use for cadmium removal

2008 ◽  
Vol 66 (2) ◽  
pp. 260-265 ◽  
Author(s):  
Jamil R. Memon ◽  
Saima Q. Memon ◽  
M.I. Bhanger ◽  
G. Zuhra Memon ◽  
A. El-Turki ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ir Spectroscopy ◽  
Banana Peel ◽  
Cadmium Removal ◽  
Ft Ir ◽  
Scanning Electron ◽  
Ft Ir Spectroscopy

scholarly journals Protein Composition and Electron Microscopy Structure of Affinity-Purified Human Spliceosomal B Complexes Isolated under Physiological Conditions

2006 ◽  
Vol 26 (14) ◽  
pp. 5528-5543 ◽  
Author(s):  
Jochen Deckert ◽  
Klaus Hartmuth ◽  
Daniel Boehringer ◽  
Nastaran Behzadnia ◽  
Cindy L. Will ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Potential Role ◽  
Protein Composition ◽  
Nuclear Extract ◽  
Physiological Conditions ◽  
Catalytic Activation ◽  
Composition And Structure ◽  
Spliceosome Activation ◽  
Related Proteins

ABSTRACT The spliceosomal B complex is the substrate that undergoes catalytic activation leading to catalysis of pre-mRNA splicing. Previous characterization of this complex was performed in the presence of heparin, which dissociates less stably associated components. To obtain a more comprehensive inventory of the B complex proteome, we isolated this complex under low-stringency conditions using two independent methods. MS2 affinity-selected B complexes supported splicing when incubated in nuclear extract depleted of snRNPs. Mass spectrometry identified over 110 proteins in both independently purified B complex preparations, including ∼50 non-snRNP proteins not previously found in the spliceosomal A complex. Unexpectedly, the heteromeric hPrp19/CDC5 complex and 10 additional hPrp19/CDC5-related proteins were detected, indicating that they are recruited prior to spliceosome activation. Electron microscopy studies revealed that MS2 affinity-selected B complexes exhibit a rhombic shape with a maximum dimension of 420 Å and are structurally more homogeneous than B complexes treated with heparin. These data provide novel insights into the composition and structure of the spliceosome just prior to its catalytic activation and suggest a potential role in activation for proteins recruited at this stage. Furthermore, the spliceosomal complexes isolated here are well suited for complementation studies with purified proteins to dissect factor requirements for spliceosome activation and splicing catalysis.

Synthesis and Characterization of MoO2 Nanoplates Prepared by Thermal Evaporation of MoO3 and S Powders

2016 ◽  
Vol 697 ◽  
pp. 3-6
Author(s):  
Han Qing Li ◽  
Zhi Jian Peng ◽  
Jing Wen Qian ◽  
Zhen Guang Shen ◽  
Xiu Li Fu
Keyword(s):  
Electron Microscopy ◽  
Large Scale ◽  
Thermal Evaporation ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Super Capacitor ◽  
Transmission Electron ◽  
Composition And Structure ◽  
Battery Electrode

MoO2 has been widely used in many fields such as catalyst, gas-senor, super capacitor and Li-ion battery electrode. In this paper, MoO2 nanoplates were synthesized in high density and large scale on silicon substrates via simple thermal evaporation of MoO3 and S powders at 950 °C in a tube furnace. The morphology, composition and structure of the nanoplates were characterized by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The results indicate that the as-synthesized nanoplates are of well crystalline structure, and the thickness of these nanoplates is in the range of 100-300 nm. The growth mechanism of the nanoparticles was proposed as a vapor-solid process.

scholarly journals The Effect of Precursors Concentration on the Structure and Micromagnetic Properties of Ultrafine Iron Oxides Obtained by Sol-Gel Route

2016 ◽  
Vol 3 (1) ◽  
pp. 38-45
Author(s):  
V. Kotsyubynsky ◽  
A. Hrubiak ◽  
L. Mohnatska ◽  
M. Gasyuk ◽  
V. Moklyak
Keyword(s):  
Phase Composition ◽  
Composite Materials ◽  
Ir Spectroscopy ◽  
Sol Gel ◽  
Iron Nitrate ◽  
Colloidal Solutions ◽  
X Ray Diffraction ◽  
Magnetic Microstructure ◽  
Iron Citrate ◽  
X Ray

Nanodispersed composite materials -Fe2O3/-Fe2O3 were obtained by thermaldecomposition of iron citrate xerogel hydrate synthesized by iron nitrate and citrate acid solutionswith different colloidal solutions of Fe(NO3)39H2O and С6Н8О7 Н2О for different molar ratiobetween precursors. The influence of the precursors molar concentration and calcinationtemperature on the material phase composition, crystalline and magnetic microstructure, surfacecondition was studied. Methods of X-ray diffraction, Mössbauer spectroscopy, electron microscopyand IR - spectroscopy were used.

Structure and Thermoelectric Properties Correlation in half-Heusler ZrNiSn- based Bulk Nano-composite Materials by Transmission Electron Microscopy

2010 ◽  
Vol 1267 ◽  
Author(s):  
Dinesh Misra ◽  
Julien Pierre Amelie Makongo Mangan ◽  
Michael R. Shabetai ◽  
Girija Shankar Chaubey ◽  
John Wiley ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Composite Materials ◽  
Thermoelectric Properties ◽  
Powder Diffraction ◽  
Phase Identification ◽  
Nano Composite ◽  
X Ray ◽  
Transmission Electron

AbstractWe report the effects of HfO2 nanoparticles as inclusion to the Zr0.5Hf0.5Ni0.8Pd0.2Sn0.99Sb0.01 half-Heusler matrix on the thermoelectric properties. X-ray powder diffraction and transmission electron microscopy were employed for the phase identification and microstructure characterization of the composites. The transport properties are mainly discussed with regards to the microstructure details.

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