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Formation of hydroxyapatite (HAp)/pr...

Touny, Ahmed H.

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Formation of hydroxyapatite (HAp)/protein composites as synthetic bone analogs.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Formation of hydroxyapatite (HAp)/protein composites as synthetic bone analogs./
Author:	Touny, Ahmed H.
Description:	231 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 2183.
Contained By:	Dissertation Abstracts International66-04B.
Subject:	Engineering, Biomedical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3173014
ISBN:	9780542107450

Formation of hydroxyapatite (HAp)/protein composites as synthetic bone analogs.
Touny, Ahmed H.

Formation of hydroxyapatite (HAp)/protein composites as synthetic bone analogs. - 231 p.

Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 2183.

Thesis (Ph.D.)--The Pennsylvania State University, 2005.

The formation mechanisms of calcium deficient hydroxyapatite (CDHAp) in the presence of proteins were investigated. Two protein structures have been used in this study, these of collagen and crosslinked gelatin. Two routes have been used to study the formation of CDHAp. The first route involves the hydration of alpha-Tricalcium phosphate. The second one involves the acid-base reaction between tetracalcium and dicalcium phosphate.

ISBN: 9780542107450Subjects--Topical Terms:

1017684
Engineering, Biomedical.

Formation of hydroxyapatite (HAp)/protein composites as synthetic bone analogs.
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100 1 $a Touny, Ahmed H. $3 1913004
245 1 0 $a Formation of hydroxyapatite (HAp)/protein composites as synthetic bone analogs.
300 $a 231 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-04, Section: B, page: 2183.
500 $a Adviser: Paul W. Brown.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2005.
520 $a The formation mechanisms of calcium deficient hydroxyapatite (CDHAp) in the presence of proteins were investigated. Two protein structures have been used in this study, these of collagen and crosslinked gelatin. Two routes have been used to study the formation of CDHAp. The first route involves the hydration of alpha-Tricalcium phosphate. The second one involves the acid-base reaction between tetracalcium and dicalcium phosphate.
520 $a Collagen and crosslinked gelatin did not inhibit the formation of calcium deficient hydroxyapatite formed by the hydration of alpha-tricalcium phosphate. The presence of crosslinked gelatin was found to enhance the nucleation and CDHAp formation was more rapid than when collagen was present. Based on isothermal calorimetry and x-ray diffractions data, CDHAp formation was complete in the presence of gelatin by 24 hours. In the presence of collagen 50% of alpha-tricalcium phosphate remained unreacted. Isothermal calorimetric and x-ray diffraction data indicated that the presence of protein to have no significant effect on the formation of CDHAp by acid base reaction between tetracalcium and dicalcium phosphate. Tensile and compressive strengths values of CDHAp formed in the presence of protein were lower than those when CDHAp formed in the absence of proteins.
520 $a Milling of collagen with CDHAp precursors before hydration were found to improve the reaction kinetics and the mechanical properties of the produced CDHAp/collagen composites. It was found that the total evolved heat when CDHAp formed by the hydration of alpha-tricalcium phosphate in the presence of milled collagen was approximately double of that for non-milled collagen. CDHAp formation by the hydration of alpha-TCP in the presence of milled collagen was complete by 24 hours. The compressive strength values of CDHAp formed in the presence of milled collagen were greatly improved indicating that the benefit of reducing fiber size in improving fiber dissipation and the homogeneity between the collagen fibers and CDHAp precursors were enhanced.
590 $a School code: 0176.
650 4 $a Engineering, Biomedical. $3 1017684
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
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710 2 0 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 66-04B.
790 1 0 $a Brown, Paul W., $e advisor
790 $a 0176
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3173014