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  • 1
    Electronic Resource
    Electronic Resource
    Double-Layer Bioactive Glass Coatings Obtained by Pulsed Laser Deposition (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 277-280 
    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: Pulsed laser deposition was used to obtain functionally graded bioactive glass coatings ontitanium substrates. An UV KrF* (λ=248 nm, τ〉7 ns) excimer laser was used for the multi-pulseirradiation of the targets. The depositions were performed in oxygen while keeping substratetemperature at 400°C. We used sintered glass targets in the system SiO2-Na2O-K2O-CaO-MgOP2O5that differed in SiO2 content, which was either 57 wt.% (6P57) or 61 wt.% (6P61). A glass6P61 was used as the first layer in direct contact with the metallic substrate, while the outerbioactive layer was made of glass 6P57. Both the bioactive coatings and the bulk glasses wereanalyzed by Fourier transform infrared spectrometry (FTIR), grazing incidence X-ray diffraction(GIXRD), and scanning electron microscopy (SEM). The FTIR spectra of the glass powders andglass coatings showed the main vibration modes of the Si-O-Si groups. GIXRD analysis confirmedthat the glass coatings had an amorphous structure. The SEM micrographs of the glass coatingsshowed the films to consist of droplets with diameters ranging from 0.2 to 5 μm. SEM was used todetermine the rate of apatite formation on the coating when exposed to simulated body fluid (SBF)solution for 7 days. We demonstrated that pulsed laser deposition leads to good glass-metaladhesion on the substrate and well attached bioactive particles on the surface. We consider thereforethis method appropriate for forming implants that can develop an apatite layer after immersion inSBF
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.277.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetoexcitons in Type-II Self-Assembled Quantum Dots and Quantum-Dot Superlattices (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 518 (July 2006), p. 51-56 
    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: Exciton states in type-II InP/InGaP and GaSb/GaAs self-assembled quantum dots andquantum-dot superlattices subject to a normal magnetic field are calculated. Strain is explicitlytaken into account in single particle models of the electronic structure, while an exactdiagonalization approach is adopted to compute the exciton states. Strain reverts type II bandalignment in InP quantum dots to type I, therefore no transitions between the lowest energy states ofdifferent angular momenta are observed. On the other hand, strain increases the barrier for theelectron in the conduction band of GaSb/GaAs quantum dots, therefore the exciton, beingcomposed of electron and hole states of various angular momenta, may have a finite angularmomentum in the ground state. Consequently, the oscillator strength in the InP single quantum dotand quantum-dot superlattice increases with the magnetic field, while the angular momentumtransitions between the bright and the dark exciton states in the GaSb system bring about decay ofthe oscillator strength when the magnetic field exceeds a certain value
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.518.51.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Intersublevel Absorption in Stacked n-Type Doped Self-Assembled Quantum Dots (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 494 (Sept. 2005), p. 37-42 
    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 intersublevel absorption in n-doped InAs/GaAs self-assembled quantum-dotmolecules composed of three quantum dots is theoretically considered. The transition matrix elements and the transition energies are found to vary considerably with the spacer thickness. For s polarized light, decreasing the thickness of the spacer between the dots brings about crossings between the transition matrix elements, but the overall absorption is not affected by the variation of the spacer thickness. For p-polarized light and thick spacers, there are no available transitions in the single quantum dot, but a few of them emerge as a result of the electron state splitting in the stacks of coupled quantum dots, which leads to a considerable increase of the transition matrix elements, exceeding by an order of magnitude values of the matrix elements for s-polarized light
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.494.37.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of α-TCP Cements from Calcium Deficient Hydroxyapatite Obtained by Hydrothermal Method (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 821-824 
    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 this paper the synthesis of bioactive cement based on α-Ca3(PO4)2 (α-TCP) and calcium deficient hydroxyapatite (CDHAp), obtained by hydrothermal method from CaCl2, EDTA, NaH2PO4·12H2O and urea at 160oC, was described. According to the results of DTA, SEM, X-ray and FTIR analyses performed in this investigation, it is shown that CDHAp is transformed to β- TCP at 780oC, and to α-TCP at 1400oC. The hardening of the samples, prepared from the mixture ofα-TCP and 2.5 % solution of Na2HPO4, in simulated body fluid at 37oC, was followed by the microstructure changes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.821.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Sintering Behaviour of Nanosized HAP Powder (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 259-262 
    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 influences of temperature and time on sintering behaviour of nanosized HAP powderwere investigate in this paper. The calcium hydroxyapatite powder, with the average crystallite sizeof 34 ± 1 nm, was uniaxially pressed at a pressure of 500 MPa. Obtained green compacts weresintered at temperature ranging from 1000ºC to 1200ºC in air atmosphere at various times.According to the results of scanning electron microscopy, X-ray and FTIR analyses, it is shown thatHAP compacts with dense microstructure and average grain size below 250 nm is obtained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.259.pdf
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