Research on Thermoelastic Tension in Two-Layer Structure of Glassceramic ZERODUR by Modulation Polarimetry Method
Irina Minailova,
Igor Matyash,
Boris Serdega,
Volodymyr Maslov,
Nataliya Kachur
Issue:
Volume 2, Issue 5, September 2014
Pages:
93-97
Received:
17 September 2014
Accepted:
25 October 2014
Published:
30 October 2014
DOI:
10.11648/j.nano.20140205.11
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Abstract: Thermotension induced by a thermal stream from contact heating with a capacity of 1 W at a slight temperature gradient within a sample (6-10°С) has been found in the sample consisting of two bonded plates made from the glass ceramics ZERODUR by means of the method of a modulation polarimetry. Changes in the distribution of values of tension lengthwise and crosswise in the directions of a thermal stream in the course of sample heating have been measured. The research showed that the reason of thermotension was related to a connecting layer and a distinction in values of the photoelastic constant of a nanocrystal and glass phase of ZERODUR.
Abstract: Thermotension induced by a thermal stream from contact heating with a capacity of 1 W at a slight temperature gradient within a sample (6-10°С) has been found in the sample consisting of two bonded plates made from the glass ceramics ZERODUR by means of the method of a modulation polarimetry. Changes in the distribution of values of tension lengthw...
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Bio-Synthesis of Magnetite Nanoparticles by Bacteria
Mohamed Abdul-Aziz Elblbesy,
Adel Kamel Madbouly,
Thamer Abed-Alhaleem Hamdan
Issue:
Volume 2, Issue 5, September 2014
Pages:
98-103
Received:
11 October 2014
Accepted:
27 October 2014
Published:
30 October 2014
DOI:
10.11648/j.nano.20140205.12
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Abstract: A promising avenue of research in materials science is to follow the strategies used by Mother Nature to fabricate ornate hierarchical structures as exemplified by organisms such as diatoms, sponges and magnetotactic bacteria. Some of the strategies used in the biological world to create functional inorganic materials may well have practical implications in the world of nanomaterials. The aim of our work is to examine the synthetic of magnetite nanoparticles under different conditions to show the influence in magnetic properties of magnetite nanoparticles. Magnetospirillum strain AMB-1 was used in this study in order to produce magnetite nanoparticles. Magnetite nanoparticles of average size~47 nm were obtained. The magnetic properties of magnetite nanoparticles under different incubation temperature were examined and a small influence in magnetic properties of magnetite nanoparticles was indicated.
Abstract: A promising avenue of research in materials science is to follow the strategies used by Mother Nature to fabricate ornate hierarchical structures as exemplified by organisms such as diatoms, sponges and magnetotactic bacteria. Some of the strategies used in the biological world to create functional inorganic materials may well have practical implic...
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Soluble Poly (Methyl Methacrylate) Composites Containing Covalently Associated Zirconium Dioxide Nanocrystals
Natalia Yevlampieva,
Alexander Bugrov,
Tatiana Anan’eva,
Mikhail Antipov,
Evgeny Ryumtsev
Issue:
Volume 2, Issue 5, September 2014
Pages:
104-111
Received:
26 September 2014
Accepted:
10 October 2014
Published:
16 December 2014
DOI:
10.11648/j.nano.20140205.13
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Abstract: Well soluble composite samples of poly(methyl methacrylate) containing hybrid nanoparticles with covalently associated ZrO2 nanocrystals of an average size of (20±5) nm have been studied by light scattering, viscometry and absorption spectroscopy methods in diluted solutions. Composites were synthesized by two ways: in situ bulk polymerization of methyl methacrylate in a presence of ZrO2, and by polymerization of methyl methacrylate in toluene solution with the dispersed ZrO2 nanocrystals. Surface of ZrO2 was preliminary chemically modified by γ-(trimethoxysilyl)propyl methacrylate in both cases. Weight fraction of ZrO2 in composite samples was varied in the range 1-3 %. Solution properties of composite polymers revealed that a way of monomer polymerization (in bulk or in solution) affect the type of the produced polymer-inorganic hybrids. Sphere like “core-shell” nanoparticles with a single ZrO2 nanocrystal as a core are mainly formed when polymerization in solution is carried out. Under the conditions of in situ bulk polymerization the organic-inorganic particles of significantly larger size with the irregular number of associated ZrO2 nanocrystals are produced. The size of hybrid nanoparticles in composite samples was determined. Transmission electron microscopy was applied to visualize the difference of ZrO2 distribution in thin films of the both type composite samples.
Abstract: Well soluble composite samples of poly(methyl methacrylate) containing hybrid nanoparticles with covalently associated ZrO2 nanocrystals of an average size of (20±5) nm have been studied by light scattering, viscometry and absorption spectroscopy methods in diluted solutions. Composites were synthesized by two ways: in situ bulk polymerization of m...
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