Détail de l'auteur
Auteur أسماء حرابي |
Documents disponibles écrits par cet auteur (2)
Affiner la recherche Interroger des sources externes
Titre : تحسين الخصائص الميكانيكية و البيوحيوية للهيدروكسيأباتيت الطبيعي Type de document : texte imprimé Auteurs : أسماء حرابي, Auteur ; عبد الحميد حرابي, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 111ورقة. Format : 30 سم. Note générale : 2نسخ موجودة مكتبة المركزية
Langues : Arabe (ara) Catégories : Arabe
الفيزياءTags : علوم المواد:خزفيات الهيدروكسيابأتيت السائل الفسيولوجي النشاط الحيوي Hydroxyapatite β-TCP P2O5 B2O3 SBF Bioactivity Bioactivité Index. décimale : 530 الفيزياء Résumé : The main objective of this research is to study the hydroxyapatite (HA:
Ca10(PO4)6(OH)2,) which was extracted from cortical bovine. This latter because of both its abundance and high purity may be considered as an exciting starting material for cheap bioceramics production. The effect of milling time, sintring temperature and P2O5 and B203 additions on density, microhardness, bioactivity and compatibility of Hydroxyapatite have been studied. In order to accomplish the above objectives, many techniques have been used to study and characterize the chemical and physical properties of prepared samples. The most important of them are Scanning Electronic Microscope (SEM), Infra-Red (IR), X-ray Diffraction (XRD)
and the Induced Coupled Plasma (ICP-OES). In the first part the effect of milling time on the natural hydroxyapatite particles size has been studied. In addition, we studied the effect of sintring temperature on natural hydroxyapatite stability. and found that this latter is stable, so that at all temperatures the only phase present was Hydroxyapatite. Also, this latter has significant mechanical roperties. In addition, we studied the effect of the introduction of certain additives in Hydroxyapatite as P2O5 and B2O3 with a percentage of 3% at the following temperatures: 1050 ° C and 1250 ° C.. Although the introduction of the additions at 1050 ° C has not removed the percentage of sintering, but improved mechanical properties, in particular when B2O3 is added, where the value of microhardness increased to 0.96 GPa compared to 0.61 GPa obtained without additions and the value of the tensile strength increased from 6.7 MPa to 17 MPa. At 1250 ° C, the effect of additions was evident where the sintering percentage reached 93%, and the value of the tensile strength has jumped to 67 MPa in the samples containing 3% of B2O3 compared to a low value in the range of 13 MPa for samples without additions. these additives led to the transformation of the hydroxyapatite in ß-TCP, in different percentages. We can also observe that the ß-TCP percentage was higher when the sintering temperature is 1250 ° C. After the immersion of the different samples in SBF for different times, it was found that when the temperature is 1050 ° C, for the samples whithout additions and those containing P2O5 the apatite layer appears on the surface of samples after 14 days. But for samples containing B2O3 the appearance of the apatite layer was quicker, and that appears after only 3 days of immersion. While at the temperature 1250 ° C, any apatite layer has been observed on the surface of the different samples and this is due to the high relative density.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/AHAR4163.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10711 تحسين الخصائص الميكانيكية و البيوحيوية للهيدروكسيأباتيت الطبيعي [texte imprimé] / أسماء حرابي, Auteur ; عبد الحميد حرابي, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2016 . - 111ورقة. ; 30 سم.
2نسخ موجودة مكتبة المركزية
Langues : Arabe (ara)
Catégories : Arabe
الفيزياءTags : علوم المواد:خزفيات الهيدروكسيابأتيت السائل الفسيولوجي النشاط الحيوي Hydroxyapatite β-TCP P2O5 B2O3 SBF Bioactivity Bioactivité Index. décimale : 530 الفيزياء Résumé : The main objective of this research is to study the hydroxyapatite (HA:
Ca10(PO4)6(OH)2,) which was extracted from cortical bovine. This latter because of both its abundance and high purity may be considered as an exciting starting material for cheap bioceramics production. The effect of milling time, sintring temperature and P2O5 and B203 additions on density, microhardness, bioactivity and compatibility of Hydroxyapatite have been studied. In order to accomplish the above objectives, many techniques have been used to study and characterize the chemical and physical properties of prepared samples. The most important of them are Scanning Electronic Microscope (SEM), Infra-Red (IR), X-ray Diffraction (XRD)
and the Induced Coupled Plasma (ICP-OES). In the first part the effect of milling time on the natural hydroxyapatite particles size has been studied. In addition, we studied the effect of sintring temperature on natural hydroxyapatite stability. and found that this latter is stable, so that at all temperatures the only phase present was Hydroxyapatite. Also, this latter has significant mechanical roperties. In addition, we studied the effect of the introduction of certain additives in Hydroxyapatite as P2O5 and B2O3 with a percentage of 3% at the following temperatures: 1050 ° C and 1250 ° C.. Although the introduction of the additions at 1050 ° C has not removed the percentage of sintering, but improved mechanical properties, in particular when B2O3 is added, where the value of microhardness increased to 0.96 GPa compared to 0.61 GPa obtained without additions and the value of the tensile strength increased from 6.7 MPa to 17 MPa. At 1250 ° C, the effect of additions was evident where the sintering percentage reached 93%, and the value of the tensile strength has jumped to 67 MPa in the samples containing 3% of B2O3 compared to a low value in the range of 13 MPa for samples without additions. these additives led to the transformation of the hydroxyapatite in ß-TCP, in different percentages. We can also observe that the ß-TCP percentage was higher when the sintering temperature is 1250 ° C. After the immersion of the different samples in SBF for different times, it was found that when the temperature is 1050 ° C, for the samples whithout additions and those containing P2O5 the apatite layer appears on the surface of samples after 14 days. But for samples containing B2O3 the appearance of the apatite layer was quicker, and that appears after only 3 days of immersion. While at the temperature 1250 ° C, any apatite layer has been observed on the surface of the different samples and this is due to the high relative density.
Diplôme : Doctorat en sciences En ligne : ../theses/physique/AHAR4163.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10711 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité حرا/4163 حرا/4163 Thèse Bibliothèque principale Thèses Disponible
Titre : دراسة الخصائص الفيزيائية و النشاط الحيوي للهيدروكسيأباتيت الطبيعي Ca10(PO4)6(OH)2 Type de document : texte imprimé Auteurs : أسماء حرابي ; جامعة قسنطينة, Éditeur scientifique ; عبد الحميد حرابي, Directeur de thèse Année de publication : 2009 Importance : 100 ورقة Format : 30 سم Note générale : 02 نسخ موجودة في مخزن المكتبة المركزية 01 قرص مضغوط Langues : Arabe (ara) Catégories : Arabe
الفيزياءTags : فيزياء المواد:الخزفيات التلبيد الهيدروكسيأباتيت السائل الفيزيولوجي النشاط الحيوي hydroxyapatite sintring P2O5 B2O3 Bioactivity SBF frittage Bioactivité Index. décimale : 530 الفيزياء Résumé : The main objective of this research is to study the hydroxyapatite (HA:
Ca10(PO4)6(OH)2,) which was extracted from cortical bovine. This latter because of both its abundance and high purity may be considered as an exciting starting material for cheap bioceramics production. The effect of various experimental conditions and P2O5 et B203 additions on sintering, microhardness, bioactivity and compatibility of HA have also been taken into account. In order to accomplish the above objectives, many techniques have been used to study
and characterize the chemical and physical properties of prepared samples. The most important of them are Scanning Electronic Microscope (SEM), Infra-Red (IR) and X-ray Diffractio (XRD). The first result from this research is the effect of temperature and time of sintering on the properties of HA. Where there was a close correlation between the sintering temperature and mechanical properties of these samples. Indeed, the sintering time has a significant influence on the growth of grains. In addition, the effect of milling time on particle size has not been overlooked. Powders of sub-micron particle sizes have been obtained. The influence of P2O5 and B203 additions on HA properties was also studied. The addition of P2O5 decreased the sintering temperature to a maximum of 1200°C, where the rate of densification of about 93% is obtained for the various additions. As far as micro-hardness is concerned, a value of 5.2 GPa was obtained for 3 wt% P2O5 addition, under the same conditions. This value is much higher than that (2.1 GPa) obtained for samples without additions. A relatively higher tensile strength value of 67 MPa, was measured for samples with 3 wt% P2O5 addition, well above that (13 MPa) of samples without addition and sintered at 1250°C. In the case of the second addition type (B203), it has no positive effect on samples densification. Micro-hardness values of 4.97
and 5.68 GPa were measured for samples with 3 wt% P2O5 addition and sintered at 1250 and 1300°C, respectively. These values are also relatively higher than the 3.4 and 4.7 GPa, measured for samples without additions. Finally, it has also been found that Apatite formation on HA surface during its immersion in "Simulated Body Fluid (SBF), was confirmed. In addition, these samples resisted well to lactic acid (the weight loss ratio was relatively low).Diplôme : Magistère En ligne : ../theses/physique/AHAR2956.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6617 دراسة الخصائص الفيزيائية و النشاط الحيوي للهيدروكسيأباتيت الطبيعي Ca10(PO4)6(OH)2 [texte imprimé] / أسماء حرابي ; جامعة قسنطينة, Éditeur scientifique ; عبد الحميد حرابي, Directeur de thèse . - 2009 . - 100 ورقة ; 30 سم.
02 نسخ موجودة في مخزن المكتبة المركزية 01 قرص مضغوط
Langues : Arabe (ara)
Catégories : Arabe
الفيزياءTags : فيزياء المواد:الخزفيات التلبيد الهيدروكسيأباتيت السائل الفيزيولوجي النشاط الحيوي hydroxyapatite sintring P2O5 B2O3 Bioactivity SBF frittage Bioactivité Index. décimale : 530 الفيزياء Résumé : The main objective of this research is to study the hydroxyapatite (HA:
Ca10(PO4)6(OH)2,) which was extracted from cortical bovine. This latter because of both its abundance and high purity may be considered as an exciting starting material for cheap bioceramics production. The effect of various experimental conditions and P2O5 et B203 additions on sintering, microhardness, bioactivity and compatibility of HA have also been taken into account. In order to accomplish the above objectives, many techniques have been used to study
and characterize the chemical and physical properties of prepared samples. The most important of them are Scanning Electronic Microscope (SEM), Infra-Red (IR) and X-ray Diffractio (XRD). The first result from this research is the effect of temperature and time of sintering on the properties of HA. Where there was a close correlation between the sintering temperature and mechanical properties of these samples. Indeed, the sintering time has a significant influence on the growth of grains. In addition, the effect of milling time on particle size has not been overlooked. Powders of sub-micron particle sizes have been obtained. The influence of P2O5 and B203 additions on HA properties was also studied. The addition of P2O5 decreased the sintering temperature to a maximum of 1200°C, where the rate of densification of about 93% is obtained for the various additions. As far as micro-hardness is concerned, a value of 5.2 GPa was obtained for 3 wt% P2O5 addition, under the same conditions. This value is much higher than that (2.1 GPa) obtained for samples without additions. A relatively higher tensile strength value of 67 MPa, was measured for samples with 3 wt% P2O5 addition, well above that (13 MPa) of samples without addition and sintered at 1250°C. In the case of the second addition type (B203), it has no positive effect on samples densification. Micro-hardness values of 4.97
and 5.68 GPa were measured for samples with 3 wt% P2O5 addition and sintered at 1250 and 1300°C, respectively. These values are also relatively higher than the 3.4 and 4.7 GPa, measured for samples without additions. Finally, it has also been found that Apatite formation on HA surface during its immersion in "Simulated Body Fluid (SBF), was confirmed. In addition, these samples resisted well to lactic acid (the weight loss ratio was relatively low).Diplôme : Magistère En ligne : ../theses/physique/AHAR2956.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=6617 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité حرا/2956 حرا/2956 Thèse Bibliothèque principale Thèses Disponible
