Peculiarities of the Crystal-Chemical Structure of Spinel Ferrites CoxFe3-xO4 (0.25 ≤ x ≤1) Obtained Under the Action of a Low-Temperature Contact Nonequilibrium Plasma

2018 ◽  
pp. 79-87
Author(s):  
L. A. Frolova ◽  
O. A. Pivovarov ◽  
O. A. Kushnerov ◽  
N. M. Tolstopalova
Keyword(s):  
Low Temperature ◽  
Chemical Structure ◽  
Nonequilibrium Plasma ◽  
Spinel Ferrites ◽  
Crystal Chemical

Elastomeric Polyether-Ester Block Copolymers. I. Structure-Property Relationships of Tetramethylene Terephthalate/Polyether Terephthalate Copolymers

1977 ◽  
Vol 50 (4) ◽  
pp. 688-703 ◽  
Author(s):  
J. R. Wolfe
Keyword(s):  
Phase Separation ◽  
Melting Point ◽  
Block Copolymers ◽  
Low Temperature ◽  
Chain Length ◽  
Chemical Structure ◽  
High Water ◽  
Structure Property ◽  
Tear Strength ◽  
Structure Property Relationships

Abstract The properties of elastomeric tetramethylene terephthalate/polyether terephthalate copolymers have been related to the chemical structure, chain length, and concentration in the copolymers of the PTMEG-, PEG-, and PPG-derived polyether units. Low-temperature properties and tear strength are dependent on all three polyether-related variables. Melting point, hardness, and stress at 100% elongation appear to be independent of polyether structure. Polyether glycols of low MW volatilize during copolymer preparation. High-MW polyethers tend to crystallize when present in the copolymers. Polyether glycols of intermediate MW (∼ 1000) yield copolymers with the best resistance to low-temperature stiffening. Copolymer synthesis is most difficult with PPG as the polyether glycol. Inherent viscosities are low, and phase separation occurs at lower polyether MW than with PTMEG or PEG. The PEG-based copolymers exhibit high water swell, particularly at intermediate and high PEG MW. The PTMEG-based copolymers are easiest to synthesize and exhibit the best overall combination of properties.

Activation of Diatomaceous Earth Low-Temperature Plasma

2020 ◽  
Vol 992 ◽  
pp. 277-282
Author(s):  
Michail Bruyako ◽  
L. Grigoryeva
Keyword(s):  
Low Temperature ◽  
Building Materials ◽  
Polymeric Materials ◽  
Chemical Compounds ◽  
Nonequilibrium Plasma ◽  
Toxic Chemical ◽  
Temperature Plasma ◽  
Industrial Buildings ◽  
High Sorption ◽  
Sorption Characteristics

In residential and industrial buildings, a special air environment is formed, which contains gas shaped toxic chemical compounds. A significant part of such substances comes from finishing polymer containing materials. Virtually all polymeric materials release certain toxic chemical compounds into the air. The methods and methods of air cleaning are different. One of the ways to solve the problem associated with providing the required standards for the quality of indoor air is the development and use of new efficient building materials using aggregates that have a high sorption capacity. The paper presents the results of a study of the effect of low temperature non-equilibrium plasma on the sorption characteristics of aggregates based on diatomite earth. Studies have been conducted on samples of natural diatomite and quartz sand. When activated by low temperature nonequilibrium plasma, the structure changes, which leads to an increase in the sorption characteristics of the samples under study.

Investigation of the ionization rate in a low-temperature nonequilibrium plasma flux

1975 ◽  
Vol 29 (4) ◽  
pp. 1314-1318
Author(s):  
G. V. Babkin ◽  
A. V. Potapov ◽  
V. V. Proshkin ◽  
L. E. Tsvetkova
Keyword(s):  
Low Temperature ◽  
Nonequilibrium Plasma ◽  
Ionization Rate ◽  
Plasma Flux ◽  
Temperature Nonequilibrium

Composition and Chemical Structure of Nitrided Silica Gel

1984 ◽  
Vol 32 ◽  
Author(s):  
R. K. Brow ◽  
C. G. Pantano
Keyword(s):  
Thin Films ◽  
Infrared Spectroscopy ◽  
Low Temperature ◽  
Silica Gel ◽  
Photoelectron Spectroscopy ◽  
Chemical Structure ◽  
Sol Gel ◽  
X Ray ◽  
Higher Temperature ◽  
Low Temperature Treatments

ABSTRACTSol/gel derived silica thin films were thermally treated in NH3 for four hours at temperatures up to 1300C. The films were analyzed by ellipsometry, X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy (IR). Over 30 mol% nitrogen was incorporated in the film treated at 1300C. Using IR and XPS analyses, -NHx groups were found to be present after low temperature treatments, while nitrogen was incorporated in an oxynitride structure after the higher temperature treatments.

scholarly journals Low Temperature Properties Of Fuel Mixtures Of Kerosene And Fame Type Used To Supply Turbine Engines In Marine And Other Non-Aeronautical Applications

2015 ◽  
Vol 22 (2) ◽  
pp. 101-105 ◽  
Author(s):  
Wojciech Dzięgielewski ◽  
Bartosz Gawron ◽  
Andrzej Kulczycki
Keyword(s):  
Low Temperature ◽  
Chemical Structure ◽  
Methyl Esters ◽  
Jet Fuel ◽  
Turbine Engines ◽  
Cold Filter Plugging Point ◽  
Fuel Jet ◽  
Fuel Mixtures ◽  
Marine Navigation ◽  
Higher Fatty Acids

Abstract A worldwide trend to popularise gradually increasing use of biofuels in various applications was a motivation for gaining interest in FAME as a commonly available biocomponent to fuels combusted in turbine engines. These engines are mainly used in aeronautics, but many of them are also used in other, non-aeronautical areas, including marine navigation. Specific conditions in which fuels are combusted in turbine engines used in these applications are the reason why fuel mixtures of kerosene and FAME type should reveal relevant low temperature characteristics. The article presents results of tests of low temperature properties of mixtures of the jet fuel Jet A-1 and methyl esters of higher fatty acids (FAME). The prepared mixtures contained different contents of FAME. The obtained results present changes of: viscosity, cloud point, pour point, crystallising point, and cold filter plugging point, depending on the percentage by volume of FAME. They also prove that the course of changes of low temperature properties of these mixtures is affected by chemical structure of the biocomponent.

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