RUcore: Rutgers University Community Repository
Synthesis and characterization of TEP-EDTA-regulated bioactive hydroxyapatite
Descriptive
TitleInfo
(displayLabel = Citation Title);
(type = uniform)
Title
Synthesis and characterization of TEP-EDTA-regulated bioactive hydroxyapatite
Name
(ID = NAME001);
(type = personal)
NamePart
(type = family)
Haders
NamePart
(type = given)
Daniel Joseph
DisplayForm
Daniel Joseph Haders
Role
RoleTerm
(authority = RUETD)
author
Name
(ID = NAME002);
(type = personal)
NamePart
(type = family)
Riman
NamePart
(type = given)
Richard
Affiliation
Advisory Committee
DisplayForm
Richard E Riman
Role
RoleTerm
(authority = RULIB)
chair
Name
(ID = NAME003);
(type = personal)
NamePart
(type = family)
Denhardt
NamePart
(type = given)
David
Affiliation
Advisory Committee
DisplayForm
David T Denhardt
Role
RoleTerm
(authority = RULIB)
internal member
Name
(ID = NAME004);
(type = personal)
NamePart
(type = family)
Moghe
NamePart
(type = given)
Prabhas
Affiliation
Advisory Committee
DisplayForm
Prabhas V Moghe
Role
RoleTerm
(authority = RULIB)
internal member
Name
(ID = NAME005);
(type = personal)
NamePart
(type = family)
Mann
NamePart
(type = given)
Adrian
Affiliation
Advisory Committee
DisplayForm
Adrian B Mann
Role
RoleTerm
(authority = RULIB)
internal member
Name
(ID = NAME006);
(type = corporate)
NamePart
Rutgers University
Role
RoleTerm
(authority = RULIB)
degree grantor
Name
(ID = NAME007);
(type = corporate)
NamePart
Graduate School - New Brunswick
Role
RoleTerm
(authority = RULIB)
school
TypeOfResource
Text
Genre
(authority = marcgt)
theses
OriginInfo
DateCreated
(qualifier = exact)
2008
DateOther
(qualifier = exact);
(type = degree)
2008-05
Language
LanguageTerm
English
PhysicalDescription
Form
(authority = marcform)
electronic
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
xx, 138 pages
Abstract
Hydroxyapatite (HA), Ca10(PO4)6(OH)2, the stoichiometric equivalent of the ceramic phase of bone, is the preferred material for hard tissue replacement due to its bioactivity. However, bioinert metals are utilized in load-bearing orthopedic applications due to the poor mechanical properties of HA. Consequently, attention has been given to HA coatings for metallic orthopedic implants to take advantage of the bioactivity of HA and the mechanical properties of metals. Commercially, the plasma spray process (PS-HA) is the method most often used to deposit HA films on metallic implants. Since its introduction in the 1980's, however, concerns have been raised about the consequences of PS-HA's low crystallinity, lack of phase purity, lack of film-substrate chemical adhesion, passivation properties, and difficulty in coating complex geometries. Thus, there is a need to develop inexpensive reproducible next-generation HA film deposition techniques, which deposit high crystallinity, phase pure, adhesive, passivating, conformal HA films on clinical metallic substrates.
The aim of this dissertation was to intelligently synthesize and characterize the material and biological properties of HA films on metallic substrates synthesized by hydrothermal crystallization, using thermodynamic phase diagrams as the starting point. In three overlapping interdisciplinary studies the potential of using ethylenediamine-tetraacetic acid/triethyl phosphate (EDTA/TEP) doubly regulated hydrothermal crystallization to deposit HA films, the TEP-regulated, time-and-temperature-dependent process by which films were deposited, and the bioactivity of crystallographically engineered films were investigated. Films were crystallized in a 0.232 molal Ca(NO3)2-0.232 molal EDTA-0.187 molal TEP-1.852 molal KOH-H2O chemical system at 200° C. Thermodynamic phase diagrams demonstrated that the chosen conditions were expected to produce Ca-P phase pure HA, which was experimentally confirmed. EDTA regulation of Ca2+ concentration enabled the HA crystallization process to be growth dominated, producing films composed of high crystallinity, hexagonal grains on multiple metallic substrates. TEP regulation of HA crystallization enabled the deposition of an adhesive CaTiO3 intermediate layer, and then HA in a continuous, phase sequenced process on Ti6Al4V substrates, the first such process reported in the hydrothermal HA literature. The HA film was found to be deposited by a passivating competitive growth mechanism that enabled the [0001] crystallographic orientation of hexagonal single crystals to be engineered with synthesis time. Bioactivity analysis demonstrated that films were bioactive and bone bonding. Together, these results suggest that these HA films are candidates for use on metallic orthopedic implants, namely Ti6Al4V.
The aim of this dissertation was to intelligently synthesize and characterize the material and biological properties of HA films on metallic substrates synthesized by hydrothermal crystallization, using thermodynamic phase diagrams as the starting point. In three overlapping interdisciplinary studies the potential of using ethylenediamine-tetraacetic acid/triethyl phosphate (EDTA/TEP) doubly regulated hydrothermal crystallization to deposit HA films, the TEP-regulated, time-and-temperature-dependent process by which films were deposited, and the bioactivity of crystallographically engineered films were investigated. Films were crystallized in a 0.232 molal Ca(NO3)2-0.232 molal EDTA-0.187 molal TEP-1.852 molal KOH-H2O chemical system at 200° C. Thermodynamic phase diagrams demonstrated that the chosen conditions were expected to produce Ca-P phase pure HA, which was experimentally confirmed. EDTA regulation of Ca2+ concentration enabled the HA crystallization process to be growth dominated, producing films composed of high crystallinity, hexagonal grains on multiple metallic substrates. TEP regulation of HA crystallization enabled the deposition of an adhesive CaTiO3 intermediate layer, and then HA in a continuous, phase sequenced process on Ti6Al4V substrates, the first such process reported in the hydrothermal HA literature. The HA film was found to be deposited by a passivating competitive growth mechanism that enabled the [0001] crystallographic orientation of hexagonal single crystals to be engineered with synthesis time. Bioactivity analysis demonstrated that films were bioactive and bone bonding. Together, these results suggest that these HA films are candidates for use on metallic orthopedic implants, namely Ti6Al4V.
Note
(type = degree)
Ph.D.
Note
(type = bibliography)
Includes bibliographical references (p. 132-136).
Subject
(ID = SUBJ1);
(authority = RUETD)
Topic
Biomedical Engineering
Subject
(ID = SUBJ2);
(authority = ETD-LCSH)
Topic
Bioactive compounds--Therapeutic use
Subject
(ID = SUBJ3);
(authority = ETD-LCSH)
Topic
Hydroxyapatite--Biocompatibility
Subject
(ID = SUBJ4);
(authority = ETD-LCSH)
Topic
Orthopedic implants--Materials--Biocompatibility
RelatedItem
(type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier
(type = local)
rucore19991600001
Identifier
(type = hdl)
http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17321
Identifier
ETD_920
Location
PhysicalLocation
(authority = marcorg);
(displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Identifier
(type = doi)
doi:10.7282/T3MW2HGW
Genre
(authority = ExL-Esploro)
ETD doctoral
Back to the top
Rights
RightsDeclaration
(AUTHORITY = GS);
(ID = rulibRdec0006)
The author owns the copyright to this work.
Copyright
Status
Copyright protected
Availability
Status
Open
AssociatedEntity
(AUTHORITY = rulib);
(ID = 1)
Name
Daniel Haders
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
RightsEvent
(AUTHORITY = rulib);
(ID = 1)
Type
Permission or license
Detail
Non-exclusive ETD license
AssociatedObject
(AUTHORITY = rulib);
(ID = 1)
Type
License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
Back to the top
Technical
Format
(TYPE = mime);
(VERSION = )
application/x-tar
FileSize
(UNIT = bytes)
5226496
Checksum
(METHOD = SHA1)
1e5857e0a02faa7efe91100aed4f01140b431da0
ContentModel
ETD
CompressionScheme
other
OperatingSystem
(VERSION = 5.1)
windows xp
Format
(TYPE = mime);
(VERSION = NULL)
application/x-tar
Back to the top
Statistical Profile