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Wyszukujesz frazę "hydroxyapatite composite" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Synthesis and selected physicochemical properties of hydroxyapatite and white clay composite
Autorzy:
Broda, Ewa
Skwarek, Ewa
Payentko, Victoria V.
Gunko, Vladimir M.
Powiązania:
https://bibliotekanauki.pl/articles/109703.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydroxyapatite
white clay
composite compounds
Opis:
Hydroxyapatite (HAP) composites are very important biomaterials, which can be applied in various life areas. HAP composite with white clay was prepared and studied using X-ray diffraction, nitrogen adsorption, Fourier transform infrared spectroscopy (FTIR), potentiometric titration, and quasi-elastic light scattering and zeta potential measurements. The values of pHpzc (point of zero charge) and pHIEP (isoelectric point) which characterize the electrical double layer depend strongly on the white clay addition to HAP. Comparative studies of hydroxyapatite, white clay and composite using nitrogen adsorption and FTIR methods showed that in most cases composite has the properties nearly intermediate between hydroxyapatite and white clay taken for the synthesis; however, certain non- additivity was observed analyzing the properties, due to precipitation of HAP onto clay particles that changes the HAP formation conditions in comparison to HAP formation alone. Thus, changes in the condition of the composite preparation allow one to control the properties of the final materials.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1475-1483
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of hydroxyapatite/chitosan composites
Autorzy:
Szatkowski, T.
Kołodziejczak-Radzimska, A.
Zdarta, J.
Szwarc-Rzepka, K.
Paukszta, D.
Wysokowski, M.
Ehrlich, H.
Jesionowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/109806.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydroxyapatite
chitosan
composite
one-step co-precipitation
Opis:
Hydroxyapatite (HAp)/chitosan (CS) composites were synthesized via a one-step co-precipitation method from aqueous solution, with the use of calcium chloride (CaCl2) and disodium hydrogen phosphate (Na2HPO4). CS was obtained via partial deacetylation of chitin with the use of strong sodium hydroxide solution. Composites were prepared with various HAp/CS ratios (30/70, 50/50, 70/30, 85/15) for comprehensive comparison of their properties. Fourier Transform Infrared Spectroscopy (FT-IR) analysis showed that hydrogen bonds were formed between the organic matrix and the mineral compound, confirming a successful phase interconnection. X-ray diffraction patterns were obtained, enabling examination of the crystalline properties of the composites, including HAp identification. The porous structure parameters of the composites were investigated, and morphological analysis (SEM) was performed. Differential Thermal Gravimetry (DTG) analysis of the composites indicated that the material is thermally stable up to 200 oC. Additionally, Energy Dispersive Spectroscopy (EDS) analysis of the mineral was carried out to check the Ca/P ratio, and confirmed its similarity to pure HAp.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 575-585
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physicochemical properties of the novel biphasic hydroxyapatite–magnesium phosphate biomaterial
Autorzy:
Pijocha, D.
Zima, A.
Paszkiewicz, Z.
Ślósarczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/307424.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
composite
bone substitute
hydroxyapatite
magnesium phosphate cement
kompozyty
hydroksyapatyt
materiałoznawstwo
Opis:
Besides high-temperature calcium phosphates (CaPs), low-temperature calcium phosphate bone cements (CPCs), due to excellent biological properties: bioactivity, biocompability and osteoconductivity, are successfully used as bone substitutes. However, some disadvantages, related mainly to their low resorption rate and poor mechanical properties result in limited range of applications of these implant materials to non-loaded places in the skeletal system. To overcome this problem, magnesium phosphate cements (MPCs) with high strength have been considered as biomaterials. The main disadvantage of MPCs is that the acid-base setting reaction is an exothermic process that must be strictly controlled to avoid tissue necrosis. In this work, a new composite bone substitute (Hydroxyapatite Magnesium Phosphate Material – HMPM) based on hydroxyapatite (HA) and magnesium phosphate cement (MPC) with sodium pyrophosphate applied as a retardant of setting reaction was obtained. Its setting time was adequate for clinical applications. Combining properties of HA and MPC has made it possible to obtain microporous (showing bimodal pore size distribution in the range of 0.005–1.700 micrometers) potential implant material showing good surgical handiness and sufficient mechanical strength. Effectiveness of sodium pyrophosphate as a retardant of exothermic setting reaction of the new cement formulation was confirmed. After setting and hardening, the material consisted of hydroxyapatite and struvite as crystalline phases. Unreacted magnesium oxide was not detected.
Źródło:
Acta of Bioengineering and Biomechanics; 2013, 15, 3; 53-63
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of hydroxyapatite-titanium composite properties during heat treatment
Autorzy:
Mamaeva, A.
Kenzhegulov, A.
Kowalewski, P.
Wieleba, W.
Powiązania:
https://bibliotekanauki.pl/articles/306913.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydroksyapatyt
HA
obróbka cieplna
kompozyty
hydroxyapatite
titanium
magnetron sputtering
heat treatment
composite
Opis:
A biocompatible hydroxyapatite (HA) coating with a thickness of about 18–20 microns was successfully deposited by radiofrequency (RF) magnetron sputtering on titanium substrates VT1-0. The data obtained for the optimal composition and structure of hydroxyapatite can be used to create coating which will interact with a titanium substrate. Using the methods of optical and SEM, AFM, electron microprobe, FTIR and X-ray analysis, surface morphology, phase and elemental composition, structure of hydroxyapatite (HA) coatings were studied. Structural and phase transformations after heat treatment using X-ray diffraction and microscopic methods of analysis were studied. It was found that after annealing coating phase analysis showed the presence of not only hydroxyapatite (Ca5(PO4)3OH), but also compounds of tricalcium phosphate (Ca3(PO4)2) and titanium oxide. Adhesivetribological durability, friction and deformation characteristics of hydroxyapatite coating on titanium substrate were determined. The obtained coatings had high hardness, wear resistance and adhesion to the substrate and low modulus of elasticity and coefficient of friction.
Źródło:
Acta of Bioengineering and Biomechanics; 2017, 19, 4; 161-169
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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