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  • 1
    Electronic Resource
    Electronic Resource
    The Influence of Calcium at the Titanium Surface on Co-Precipitation of Ca-P and Bovine Serum Albumin (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 2375-2378 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The influence of calcium (Ca) at titanium surface on co-precipitation of Ca-P and bovine serum albumin (BSA) has been investigated by scanning electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction. The titanium surface containing Ca was prepared by immersing titanium plates into a saturated calcium hydroxyl (Ca(OH)2) solution. A solution containing BSA, calcium and phosphate ions was used for the co-precipitation test. Both BSA and calciumphosphate co-precipitated onto titanium surfaces with and without Ca. For the former, however, a thicker carbonate apatite coating, which consisted of finer crystal grains, formed and more protein precipitated compared to the surface without Ca. These results indicated that Ca at the titanium surface was favorable to the co-precipitation of BSA and Ca-P. Moreover, chemical interactions probablyoccurred during the co-precipitation of BSA and Ca-P
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.2375.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Fabricating Hydroxyapatite Spherulites with Characteristic Microporous Structure by Chitin Sol Emulsified in Oil and Gelatinized In Situ (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 419-422 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Hydroxyapatite (HA) spherulites had been fabricated successfully through a novel approach including chitin emulsion and geletion processes. The freeze-dried nano-HA powder was firstly dispersed in the chitin solvent before chitin dissolves in its solvent completely. The chitin sol containing nano-HA particles was dropped into oil and emulsified making use of liquids immiscibility effect between oil and chitin sol by stirring. The n-HA/Chitin sol spherulites gelled in situ with the existence of water molecules. Subsequently, the spherular gel granules were rinsed in distilled water to leach the solvent and dried in room circumstance. Finally, special sinteringroutines were carried to harvest spherular HA granules. The size and porosity of HA spherulites were controlled by the rate of nano-HA to chitin, the chitin concentration in the starting slurry, the stirring rate and the temperature of oil etc. In addition porosifier such as sugar was used in order to adjust the macro- and micro-porous structures in the HA spherulites. The morphological observation showed that the HA spherulites had good sphericity and characteristic microporousstructure which were favorable for medical application
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.419.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    The Effect of Different Surface Modification Agents on the Dispersion of Nano-Hydroxyapatite (n-HA) Crystallites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 55-58 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The surface of synthetic calcium hydroxyapatite (HA, Ca10(PO4)6(OH)2) was modified through combining freeze-drying, solvent replacement and surface modification methods in an effort to obtain the deaggregative n-HA crystallites. Three surface modification agents: Polyethylene glycol (PEG, Mw: 6000), poly(propyl oxide)-poly (ethyl oxide)-co-poly(propyl oxide)(Pluronic F-127, Mw: 12,000) and poly(d, l-lactide)-co-poly (ethylene glycol) (PELA, Mw: 20,000)were selected. The dispersion of the modified n-HA was characterized by sedimentation time in distilled water, acetone and dimethyl formamide (DMF). The results indicate that the three surface modification agents influence the dispersion of n-HA crystallites in various solvent based on different mechanisms. Transmission electron microscopy (TEM) observation shows that the dried and acetone-replacement powders are composed of needle-like HA crystallites isolated individually. The chosen solvents have a profound effect on the sedimentation time. In distilled water, the dispersion of as-synthesized n-HA crystallites is increased greater by F127 than by PEG. After freeze-drying, the two n-HA particles show homogeneous dispersion in acetone. The colloid stability of freeze-dried HA/PEG, solution-replaced HA/F127 and solution-replaced HA/PELA in DMF were improved significantly. The suspensions remained stable after 30 days with only a bluetransparent sol being observed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.55.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of a Silane Coupling Agent on Mechanical Properties of Hydroxyapatite/Polycaprolactone Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 531-534 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Silanization of hydroxyapatite was employed to improve the bonding betweenhydroxyapatite and polycaprolactone. FTIR of HA after silanization showed that new peaksattributed to silane do exist. The increase of melting and crystallization temperatures of silanedcomposites shown from DSC implied that there exists much stronger bonding between PCL andsilaned HA particles. Fracture surface of composites after tensile testing observed by using SEMshowed that silaned HA particles dispersed much evenly and coalesced compactly in PCL matrix,suggesting that silaned HA particles had good compatibility with PCL. The tensile strength andmodulus increased from 16.81 MPa and 239.21 MPa to 20.49 MPa and 539.57 MPa, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.531.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Immobilization of Bovine Serum Albumin on Titanium through Plasma Polymerization of Allylamine and Crylic Acid (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 713-716 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present work, technique of plasma polymerization was used to generate amido (-NH2) and carboxyl (-COOH) on titanium surface for immobilizing bovine serum albumin (BSA).After plasma polymerization of allylamine and crylic acid, the contact angle with respect to doubledistilled water significantly increased. Surface components were detected by X-ray photoelectronspectroscopy and Fourier transform infrared reflection-absorption spectroscopy. The results showedthat BSA was successfully immobilized on the titanium surface and the amounts of BSA onspecimens were relied on the properties of thin film deposited through plasma polymerization,which was corresponding to the ultraviolet spectrophotometer result
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.713.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    The Effect of Particle Morphologies on Mechanical Properties of Porous Hydroxyapatite Scaffold (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 179-182 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Porous hydroxyapatite (HA) ceramic scaffolds are extensively used to induct the tissuegrowth for bone repair and replacement, and serve functions to support the adhesion, transfer,proliferation and differentiation of cells. Highly porous structure is always expected for its positiveeffect on the bone regeneration in vivo, nevertheless high porosity always accompanies a decrease instrength of the HA ceramic scaffolds. Therefore, it is significant to improve the strength of the HAceramic scaffolds with highly interconnected porosity so that they are more suitable in clinicapplications. The aim of this study is to investigate the effect of starting materials on mechanicalproperty of final scaffold in order to optimize the preparation process. In this work, three startingHA particles with different morphologies are used to prepare highly porous HA ceramic scaffolds bythe polymer impregnation approach in the same preparation process. The phase composition,microstructure and mechanical properties of the sintered porous HA scaffolds are investigated byx-ray diffraction (XRD), scanning electron microscopy (SEM) and compressive test. Theexperimental results show that the particle morphologies have influence on the slurry viscosity andfurther affect the coating amount on the sponge. The porous HA ceramics fabricated by sphericalHA particle hold the highest compressive strength than the other two HA scaffolds for bettersintering property. It is an effectively method to improve the mechanical property of porous HAceramic scaffolds by optimizing the starting particle morphology
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.179.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Development of Injectable Calcium Phosphate Cement Adding with ZrO〈sub〉2〈/sub〉 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 347-350 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present study, ZrO2 was added into the injectable calcium phosphate cements(CPCs) to improve their mechanical strength. Different mass fractions of ZrO2 (5 %, 10 %, 15 %,20%) were mixed with the powder components consisted of tricalcium phosphate (α-TCP) andhydroxyapatite (HA). Then formed the paste via adding the liquid component consisted of citricacid. The compressive strength, the injectability, the initial setting time and finial time of CPC weremeasured, respectively. X-ray diffraction (XRD) was employed to analyse the phase of as-preparedCPC. Scanning Electron Microscope (SEM) and Energy dispersive spertrum (EDS) were used toobserve the morphology and indicate the element components of CPC. The compressive strength ofZrO2-CPC was higher than that of CPC without added ZrO2. The compressive strength got themaximal when the mass fraction of ZrO2 was 15%. It had no effect on the injectability with addingZrO2, which were 89 % to 92 %. It had a slight down-regulation of the initial and final setting timewith adding ZrO2. SEM showed that there was amounts needle-like substance in CPC, which mightbe related to the improvement of compressive strength of CPC. XRD showed that there were HA, afew of α-TCP and ZrO2 diffraction peaks in CPCs. The present results indicate that it is feasible toimprove the compressive strength of injectable CPC via adding ZrO2
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.347.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Regulating Size, Morphology and Dispersion of Nano-Crystallites of Hydroxyapatite by pH Value and Temperature in Microemulsion System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 195-198 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nanosized hydroxyapatite (nano-HA) in narrow size distribution was prepared in themicroemulsion system. The experimental factors of pH values and temperature were speciallyinvestigated in order to receive nano-HA particles with the required morphologies. Several kinds ofnano-HA with different shapes, sizes and crystallization were obtained by regulating the abovefactors in the experiment. After the as-received nano-HA particles were heat-treated at an elevatedtemperature, they became a kind of globular particles with an average size of 60nm and showedexcellent disperse ability in absolute alcohol
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.195.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Hydroxyapatite Formation and Protein Absorption on Triethyl Phosphate Modified Titanium Surface (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 797-800 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work, triethyl phosphate (TEP) was used to bioactivating titanium. Titanium platesgrafted with TEP were immersed in a two times concentrated simulated body fluid (2SBF) toinvestigate deposition of hydoxyapatite (HA) on the surface. A phosphate buffer solution (PBS) withbovine serum albumin (BSA) was used to evaluate adsorption of protein on the grafted titaniumsurface. The morphology, component and structure of samples were examined by scanning electronicmicroscopy, attenuated total reflection Fourier transform infrared spectroscopy and X-ray diffractionrespectively. The concentration change of BSA in adsorption test was examined with theultraviolet-visible absorption spectra (UV). The analyses showed that TEP grafted onto the titaniumsurface. In 2SBF, calcium and phosphate ions deposited spontaneously onto the grafted titaniumsurface and formed a HA coating with a network-like microporous structure after being immersed for3 days. The coating consisted of HA particles with 180-265nm in thickness and 72-85nm in width.The diameter of the micropores was about 200nm. The HA coating appeared better uniformity thanthat on the modified titanium using phosphoric acid. BSA rapidly adsorbed onto the grafted titaniumsurface at first half an hour and then the adsorption quantity almost kept constant. These resultsindicate that TEP grafting is an effective approach to modify bioactivity of titanium
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.797.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Fabrication of Microporous Apatite Coating on Titanium by a Novel Chemical Method (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 231-234 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A microporous apatite coating was fabricated by a heat-oxidation and chemical routine. The morphology, composition and structure were characterized by scanning electron microscopy with X-ray energy dispersion spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction. The components of the coating were predominantly apatite, next tri-calcium phosphate and octa-calcium phosphate. The pore size ranged from 1µm to5µm. The thickness of the coating was about 6µm ~ 10µm. The microporous coating was Ca-deficient carbonate apatite
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.231.pdf
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