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    Wyświetlanie 1-7 z 7
    Tytuł:
    Comparison of Properties of Hydroxyapatite Powders Synthesized by Chemical and Biomimetic Techniques
    Autorzy:
    Hazar Yoruç, A.
    Karakaş, A.
    Koyun, A.
    Yildiz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491408.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.J-
    Opis:
    Hydroxyapatite $[HA; Ca_{10}(PO_4)_6(OH)_2]$ which composes inorganic phase of bones and teeth is one of the biomedical materials for artificial bone, reconstruction of broken or disordered bones, coating of metallic biomedical materials and dental surgery with its great biocompatibility. In this study, HA powders were synthesized from aqueous suspensions containing $H_3PO_4$ and $Ca(OH)_2$ with 1.67 Ca/P ratios (chemical HA, CHA) and second process is carried out in simulated body fluids consisting of $(NH_4)_2HPO_4$ and $Ca(NO_3)_2 \cdot 4H_2O$ as biomimetic hydroxyapatite (BHA). Moreover, properties of bovine HA (BoHA) and commercial HA (CoHA) were compared with properties of synthesized HA powders. Chemical structures of synthesized powders have been examined by the Fourier transform infrared technique and X-ray diffraction. The results showed that BHA powders have a pure HA content and no secondary phase, CHA also has monetite phase as secondary phase with HA in its structure. Particle size analysis was carried out with laser particle sizer and zeta-sizer, surface area of powders has been analyzed by the Brunauer-Emmett-Teller technique. Powder morphology is determined using scanning electron microscopy. As a result two different synthesis methods affected properties of HA powders.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 233-235
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Different Calcium Precursors on Biomimetic Hydroxyapatite Powder Properties
    Autorzy:
    Karakaş, A.
    Hazar Yoruç, A.
    Ceylan Erdoğan, D.
    Doğan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491413.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.J-
    Opis:
    Hydroxyapatite is the main component of human hard tissues such as bones and teeth. Because it has a great biocompatibility with human organism, it is used as biomaterial with the purpose of form and repair hard tissues. Hydroxyapatite is formulated as $Ca_{10}(PO_4)_6(OH)_2$ and shows high stability under physiological conditions. In this study, biomimetic hydroxyapatite powder has been synthesized using by synthetic body fluids which has the same composition as human blood plasma. Moreover, the effect of different precursors on properties of synthesized powders has been investigated. For that purpose calcium nitrate tetrahydrate $[Ca(NO_3)_2 ·4H_2O]$, calcium chloride $[CaCl_2]$, calcium hydroxide $[Ca(OH)_2]$ and diammonium hydrogen phosphate $[(NH_4)_2HPO_4]$ were used as precursors. Mainly literature focused on the synthesis of hydroxyapatite powders was carried out using chemical method. However, in this study, the synthesis of hydroxyapatite powder is carried out using biomimetic method. Chemical structures of synthesized powders have been investigated by the Fourier transform infrared and X-ray diffraction methods. Results showed that synthesized powders have a pure hydroxyapatite structure. Surface area of the synthesized powders was measured by the Brunauer-Emmett-Teller method. Morphological structures have been characterized by using scanning electron microscopy. Furthermore, particle size of powders was calculated using the Brunauer-Emmett-Teller method. It was clearly seen that morphological properties of biomimetic hydroxyapatite have affected the use of different calcium precursors.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 236-239
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sonochemical Synthesis of Hydroxyapatite Nanoparticles with Different Precursor Reagents
    Autorzy:
    Hazar Yoruç, A.
    İpek, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1491376.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.J-
    Opis:
    Different precursor chemicals ($3Ca(OH)_2,$ $Ca(NO_3)_2$ and $CaO$ as $Ca^{2+}$ sources, $H_3PO_4$ and $(NH_4)_2HPO_4$ as $PO_4^{3-}$ sources were used to synthesis of nanosized hydroxyapatite powder with ultrasonic precipitation method. The effect of different chemical precursors was investigated. Sample characterization was achieved by powder X-ray diffraction, the Fourier transformed infrared transmission spectroscopy, zeta sizer, scanning electron microscopy, density and surface area measurements.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 230-232
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Different Phosphorus Precursors on Biomimetic Hydroxyapatite Powder Properties
    Autorzy:
    Karakaş, A.
    Hazar Yoruç, A.
    Gökçe, H.
    Karabulut, A.
    Ceylan Erdoğan, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399963.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.J-
    Opis:
    Hydroxyapatite is the main component of natural hard tissues, such as teeth and bone. It has been studied extensively as a candidate biomaterial for its use in prosthetic applications. Hydroxyapatite was formulated as $Ca_{10}(PO_4)_6(OH)_2$ and it has a high stability under physiological conditions. Also hydroxyapatite can be synthesized using different calcium and phosphorus precursors. In this study, biomimetic hydroxyapatite powder has been synthesized simulating physiological conditions. Synthetic body fluids which have the same composition as human blood plasma instead of pure water were used as precipitation media to obtain biological conditions. Recent research involved the effect of different Ca-precursors however aim of this study is to determine the effect of phosphorus resources. In this study, the synthesis of hydroxyapatite powder is carried out by using biomimetic method in synthetic body fluids. Calcium acetate $[Ca(CH_3COO)_2, CA]$ and diammonium hydrogen phosphate $[(NH_4)_2HPO_4, DAHP]$, ammonium dihydrogen phosphate $[NH_4H_2PO_4, ADHP]$, dipotassium hydrogen phosphate $[K_2HPO_4, DPHP]$ and orthophosphoric acid $[H_3PO_4, OPA]$ were used as Ca- and P-precursors. Chemical structures of synthesized powders have been examined by Fourier transform infrared and X-ray diffraction. Results showed that synthesized powders have a pure hydroxyapatite structure. However, ADHP precursors have an unfavorable effect on sintered hydroxyapatite powders. Using ADHP phase transition was caused in pure hydroxyapatite structure and apatite and whitlockite were observed as secondary phases. Their particle size, surface area determination and morphological structures have been characterized by Zeta-Sizer, biomimetic hydroxyapatite the Brunauer-Emmett-Teller analysis and scanning electron microscopy images, respectively. As a result different starting materials have affected the structure, particle size and morphological properties of biomimetic hydroxyapatite.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 418-420
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Precipitation Method on Properties of Hydroxyapatite Powders
    Autorzy:
    Hazar Yoruç, A.
    Karakaş, A.
    Ayas, E.
    Koyun, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399899.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.J-
    Opis:
    The aim of this study was the compare the properties of hydroxyapatite as a function of two different methods (chemical and biomimetic precipitation). Powder products were called as chemical hydroxyapatite for chemical method and biomimetic hydroxyapatite for biomimetic method. Precipitated powders with both methods were characterized by Fourier transform infrared, X-ray diffraction, X-ray fluorescence and measurements of hardness and density. Chemical analysis results showed that dried-biomimetic hydroxyapatite sample consists of hydroxyapatite $[Ca_{10}PO_4)_6(OH)_2]$ as main phase and beta-tricalcium phosphate (β-TCP) as secondary phase and dried-chemical hydroxyapatite sample also includes pure hydroxyapatite phase. Chemical hydroxyapatite and biomimetic hydroxyapatite powders were sintered using by spark plasma sintering method. Vickers hardness values of sintered disk samples were measured. Furthermore chemical structure of the final products was analyzed. Also density values of chemical hydroxyapatite and biomimetic hydroxyapatite disks were measured. Finally it is concluded that different precipitation methods affect hydroxyapatite properties and this can be an advantage for biomedical applications.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 371-373
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pyrolysis of Low Rank Lignites
    Autorzy:
    Koyun, A.
    Hazar Yoruc, A.
    Ceylan Erdogan, D.
    Ahlatcioglu, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399950.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    51.30.+i
    Opis:
    In this study, six different Turkish coals were studied. One of them was Zonguldak coal and the others were low rank Turkish lignites. The amount of the pyrolysed gases of the coal as $CH_4$, $C_3H_8$, $CO$, $CO_2$, $SO_2$ were determined from the experiments by using several first order reaction models that include energy distribution and the activation energy distribution during the pyrolysis was calculated at the same time. The results of pyrolysis experiments of coals were examined by means of several first order reaction models that include energy distribution. The tar amounts and overall conversion of six different coals, activation energies of nine volatile components output, standard variation values that belong to their energy distribution, maximum quantity of product of each component and molecular collision coefficients were determined. As a result of using these variables in the model equations, conversion quantities for all of the compounds of six types of coals and variation of activation distribution functions with respect to the kinds of coals were presented graphically with a comparison of the cited data in references.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 396-397
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of Hydroxyapatite/Collagen (HA/COL) Composite Powder Using a Novel Precipitation Technique
    Autorzy:
    Yoruc, A.
    Aydınoglu, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192521.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    7.85.J
    Opis:
    A new biomimetic precipitation technique was developed to synthesize hydroxyapatite/collagen nano-composites. The componential and morphological properties of nano-composites were investigated. It was revealed that the inorganic phase in the nano-composite was carbonate-substituted hydroxyapatite with low crystallinity. Indeed both characteristic peaks for HA and Col molecule and shifts of the characteristic peaks have indicated on HA-Col bonding. Morphology studies showed that hydroxyapatite particles with the average size of 50 nm were distributed homogeneously in the polymer matrix. According to the TEM micrographs, inorganic particles were needle-like and had regular crystallographic orientation. These results suggest that the hydroxyapatite/collagen nano-composites are promising biomaterials for bone tissue engineering.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1264-1267
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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