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Article
Hardening of calcium phosphate bone cement by supercritical carbon dioxide
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Article
Thermochemical gypsum conversion forming calcium phosphates
A study was carried out on effect of the conditions of physicochemical conversion of a porous gypsum intermediate product to calcium phosphates. Depending on the initial conditions of sample preparation, the m...
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Article
Ripening of calcium carbonate powders in low surface tension liquids
We have studied the ripening of calcium carbonate powders in a mother liquor for up to 18 days in relation to the content of different liquids having lower surface tension in comparison with water: dimethyl ke...
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Gypsum transformation to calcium phosphates
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Article
Zinc- and silver-substituted hydroxyapatite: Synthesis and properties
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Article
Mechanical characteristics of composites of polylactide and nanosized calcium phosphates formed in supercritical carbon dioxide
Composite materials for biomedical applications based on polylactide, a bioresorbable polymer, and nanosized calcium phosphate (hydroxyapatite) were produced using supercritical (SC) carbon dioxide. For compos...
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Article
Effect of thermal processing on characteristics of nanopowders of hydroxyapatite
The work is aimed at the study of the effect of the thermal history on the size, morphology, and structural characteristics of powders of hydroxyapatite designed for the preparation of nanocrystalline ceramics...
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Synthesis of nanohydroxyapatite by precipitation from a starch-containing solution
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Article
Synthesis of octacalcium phosphate by precipitation from solution
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Article
Low-temperature calcium carbonate ceramic
Investigations were carried out on development of a calcium carbonate ceramic with addition of potassium carbonate for regeneration of human osseous tissues. The initial materials included various calcium carb...
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Article
Nanocrystalline hydroxyapatite ceramics
The possibility of using high pressures in uniaxial pressing and rolling of nanopowders is investigated. Obtainment of a nanocrystalline hydroxyapatite ceramic intended for use in medicine is studied. The sint...
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Article
Porous chitosan matrices reinforced by bioactive calcium compounds
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Article
Stabilization of Carbonate Hydroxyapatite by Isomorphic Substitutions of Sodium for Calcium
Carbonate hydroxyapatite (CHA) is an analogue of the mineral component of bone tissue. Synthetic CHA is thermally unstable: it readily decomposes with carbon oxide evolution when sintered to ceramics. Its ther...
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Article
Hydroxyapatite of platelet morphology synthesized by ultrasonic precipitation from solution
Hydroxyapatite (HA) synthesis by precipitation with urea from aqueous solutions of calcium nitrate and ammonium hydrogenphosphate is studied. Ultrasonication during the synthesis decreases the size of platelet...
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Nanocrystalline hydroxyapatite ceramics produced by low-temperature sintering after high-pressure treatment
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Article
Effect of structural inhomogeneities on the dynamic stability of the photoelectric response of Cd0.9Zn0.1Te crystals
I(t)-dI/dt phase diagrams obtained under local and integral photoexcitation have been used to investigate the stability of the dynamic photoresponse of Cd0.9Zn0.1Te crystals containing two-dimens...
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Article
Silicon-containing hydroxylapatite nanopowders
Silicon-substituted hydroxylapatite nanopowders containing 0.14–1.4 wt % Si have been synthesized by the heterophase reaction between calcium hydroxide, diammonium hydrogen phosphate, tetraethoxysilane, and wa...
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Article
Nanosized hydroxyapatite synthesized by precipitation in a gelatin solution
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Article
Hydrotreating and Reforming Plant at Komsomol'sk Refinery. Experience in Design,Construction, Start—up
In April 2001, a new naphtha reforming unit with output of 450,000 tons/year having a preliminary hydrotreating unit with output of 600,000 tons/year was started up at Rosneft@apos; Oil Company's Komsomol'sk R...
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Article
Transformations of n-pentane, n-hexane, and benzene on high-silica zeolites containing group VIII metals
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It was found that reactions of hydrocracking and hydrogenolysis of n-pentane and n-hexane take place intensiv...
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