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  • 2005-2009  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Ceramic Coatings Deposited from Aqueous Solutions (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 527-530 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: This paper reviews novel techniques developed in our laboratory to deposit ceramicthin films from aqueous solutions. All the techniques are based on the heterogeneous nucleationand growth phenomenon; ceramic precipitates are prone to be formed preferentially onsubstrate/solution interfaces when the rate of the formation of the precipitates is appropriatelycontrolled. In “oxidative soak coating” method, metal ions with a lower valence state areoxidized in homogeneous solutions to those with a higher valence state; thereby coatings of SnO2,MnO2, CeO2, Co3O4 and Fe3O4 have been deposited. In “ligand decomposition” method, ligandsof an indium peroxo- complex are decomposed to promote spontaneous hydrolysis of the indiumion; thereby In2O3 coating has been deposited. In “enzyme-assisted precipitation” method,precipitant of metal ions is supplied by urease immobilized on a substrate to promote localdeposition of ceramics on the substrate, by which hydroxyapatite coating has been rapidlydeposited. The control of the rate of the precipitation reactions is the most important parameter.Some properties of the resultant coatings are also presented
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.527.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Biological Efficacy of Modified Structure of Polymer Surfaces for Bone Substitute (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 707-710 
    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) coatings were introduced onto Poly L-lactic Acid (PLLA) polymerin a controlled manner by immobilized urease method with a shortened precipitation time.Osteoblastic-like cellular responses to the composite were examined in terms of cell proliferation,differentiation and cell morphology, as well as the expression of bone-associated genes. The cellsexhibited higher cellular proliferation at 2 and 4 days on the HA/PLLA composite compared toPLLA scaffold, while no significant difference was observed later at 6 days. The alkalinephosphatase (ALP) activity by cells at 7 days was statistically higher on HA/PLLA scaffold than onPLLA. Moreover, the gene expression of ALP and osteocalcin (OC) was up regulated on HA/PLLAcomposite by RT-PCR analysis. The preliminary study suggested that the use of the controlledmodification of hydroxyapatite coating on PLLA scaffold to produce HA/PLLA composite mightenhance cellular activity, indicating the potential use for bone substitute in tissue engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.707.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Deposition of Bone-like Apatite Layers on the Surface of Poly(L-Lactic Acid) Using Immobilized Urease (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 667-670 
    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: Particulate layers of hydroxyapatite were deposited on the inner and outer surfaces of porous poly(L-lactic acid) monolith, PLLA, by using enzymatically derived ammonia as the precipitant. PLLA specimens were surface-modified with urease and were impregnated with aqueous solutions containing Ca2+, PO43- and urea. As ammonia was produced by hydrolysis of urea with the aid of the urease, hydroxyapatite precipitated predominantly on the surfaces of the porousPLLA. In contrast to the conventional biomimetic method or the alternate soaking method, it took shorter time period for hydroxyapatite particles to cover the surfaces of PLLA. The resultant hydroxyapatite was proved to be bone-like apatite because it had low crystallinity, contained carbonate ion in the lattice, and had a calcium-deficient composition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.667.pdf
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    Paper (German National Licenses)
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