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  • 1
    Digitale Medien
    Digitale Medien
    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
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Notizen: 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
    Materialart: Digitale Medien
    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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  • 2
    Digitale Medien
    Digitale Medien
    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
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: 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
    Materialart: Digitale Medien
    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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  • 3
    Digitale Medien
    Digitale Medien
    Sintering of Chemically Synthesized Lead(II) Selenide Fine Powders (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: PbSe fine powders were synthesized from a liquid-phase reaction of lead-ascorbic acid complex and sodium selenosulfate. The resultant powders were sintered up to nearly theoretical density by controlling the sintering atmosphere and by optimizing the sintering temperature and time. The highest sintered density, 99.7% relative to the theoretical density of 8.27 103 kg/m3, was attained when a powder compact was sintered at 998 K for 6 h under a flow of argon containing 3% H2 gas. Powder compacts could be sintered to higher than 98% when the sintering temperature was 1073 K or lower. When the sintering temperature or time exceeded the optimum range, considerable volatilization of the component occurred, resulting in a decrease in the sintered density. The use of a powder bed was found to be effective in suppressing the volatilization of the component.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02357.x
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  • 4
    Digitale Medien
    Digitale Medien
    Homogeneous Precipitation of Hydrous Tin Oxide Powders at Room Temperature Using Enzymatically Induced Gluconic Acid as a Precipitant (2000)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 83 (2000), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: Hydrous tin oxide powders were precipitated at room temperature via the neutralization of sodium stannate with gluconic acid. The gluconic acid was generated by the oxidation of glucose, with the assistance of a glucose oxidase/catalase system. The hydrous tin oxide, which had a large surface area, was obtained when a high concentration of enzymes was used as a solution. However, the apparent sizes of the precipitates were ∼0.3 μm, independent of the enzyme concentration. The precipitates were converted to tin oxide via calcination at temperatures 〉400°C.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.2000.tb01313.x
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  • 5
    Digitale Medien
    Digitale Medien
    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
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: 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
    Materialart: Digitale Medien
    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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