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  • 2005-2009  (21)
  • 1980-1984
  • 1960-1964
  • 2008  (21)
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  • 2005-2009  (21)
  • 1980-1984
  • 1960-1964
Year
  • 1
    Electronic Resource
    Electronic Resource
    Preparation of Upconversion Luminescent NaYF〈sub〉4〈/sub〉 Co-Doped with Yb〈sup〉3+〈/sup〉/Er〈sup〉3+〈/sup〉 via Hydrothermal Synthesis (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 394-397 
    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: Hexagonal NaYF4 crystals co-doped with different concentration of Yb3+ and Er3+ ions weresynthesized via hydrothermal reaction route. The samples doped with 30mol% of Yb3+ and 1mol% of Er3+showed the highest upconversion efficiencies under 980nm excitation. Powder X-ray diffraction (XRD)analyses indicated that the samples were pure hexagonal phase. The morphology of the powder wasobserved by scanning electron microscopy (SEM). With the excitation of a 980nm diode laser, stronggreen emissions were obtained at 522, 530, 542 and 551nm in addition to weak red emission at 654nm.The green and red emissions were attributed to the transitions of 4S3/2, 2H11/2 → 4I15/2 and 4F9/2 → 4I15/2 ofEr3+ ion, respectively. The additions of Yb3+ ion as sensitizer can notably enhance the upconversionefficiencies from infra-red to visible. The upconversion mechanism of the emission for the samples wasalso discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.394.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of SnO Coatings on the Bond Strength between Titanium and Porcelain (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1268-1270 
    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 aim of this investigation is to study the effect of SnO coatings on the bond strengthbetween titanium and porcelain. The coatings were produced by sol-gel method and heat-treatment at300°C. Once the coatings have been formed on the titanium substrates, self-made porcelain was fused.The specimens with pre-oxidation before porcelain fused were set as control group. It was shown SnO gelformed completely at 300°C and was composed by SnO and SnO2 in the form of a uniform film. The bondstrength between titanium and porcelain of the specimens with SnO coatings was greater than those incontrol group statistically, which might prove that the coatings reduced the oxidation of titanium surfacein the porcelain fusing progress. EDS result showed almost all fractures between titanium and porcelainoccurred at the oxide layer. Si and Sn might attend the reaction at interface. It was concluded that the SnOcoatings produced in this study can improved the titanium-porcelain bond strength
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1268.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of the Sol-Gel Derived Bioactive Glass-Fibers (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1454-1457 
    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 sol-gel derived bioactive glass short fibers in the system CaO-P2O5-SiO2 was preparedusing air-spray method. SBF immersion test indicated that the fibers possessed satisfactory bioactivity.SEM, XRD, FTIR analysis revealed that the morphologies and bioactivity of the fibers could besignificantly influenced by the composition and viscosity of the solution. The fibers are very promisingbiomaterials for applications to bone restoration and tissue engineering as the bone defects fillers oradditives for strengthening of the biomedical polymers
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1454.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Phase Separation and Nanocrystal TiO〈sub〉2〈/sub〉 Formation in Na〈sub〉2〈/sub〉O-B〈sub〉2〈/sub〉O〈sub〉3〈/sub〉-SiO〈sub〉2〈/sub〉-TiO〈sub〉2〈/sub〉 System (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1419-1421 
    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 basic compositions of the samples were selected inside and outside of Na2O-B2O3-SiO2glass phase separation region, respectively. Nanocrystalline TiO2 was crystallized by melt-phaseseparation process. The results showed that the phase separation of Na2O-B2O3-SiO2-TiO2 glass systemwas advantaged to TiO2 nucleation and growth, and then the formation of the nanocrystalline. The mainmechanism of TiO2 crystallization is that the rich alkali-boron phase has the lower viscidity and higherparticles moving ability than that of parent phase glass. Therefore, the movement rate of TiO2 particle canbe promoted and TiO2 crystallization can be accelerated. Moreover, the formation of non-homogeneousnucleus situation and the centralization function of TiO2 have less contribution to TiO2 crystallization
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1419.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanical Properties and Microstructure of Partially Sintered Zirconia Ceramics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1252-1254 
    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: Partially sintered zirconia ceramics (PSZCs) for dental uses were prepared from zirconia nanopowdervia isostatic pressing and partially sintering. The open porosities, pore diameters, grain sizes andmechanical properties of the ceramics with different densities were studied. The results show that thepores formed in the PSZCs are all open pores, with a diameter distribution of 60nm~130nm and a grainsize distribution of 120~170nm. The machinability becomes worse when the density of PSZC is higherthan 75% of the theoretical density, so a ceramic named PSZC-70% with density of 70%TD was selectedas the target material. Its bending strength is 168 MPa and fracture toughness is 1.8 MPa·m1/2. A dentalrestoration framework can be obtained via machining the PSZC-70% on a dental CAD/CAM system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1252.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Static and Dynamic Analysis of Carbon Nanotube Cantilever Based on Molecular Dynamics Simulation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 631-635 
    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: Static and dynamic characteristic of carbon nanotube is analyzed by molecular dynamicsimulation. Static analysis show that maximum deflection of carbon nanotube appears at 0.033nmdistance from free end of cantilever. When the value of driving voltage is less, the flexibility ismore important, then the stiffness increase with the voltage increasing, and the collapse structure orhole appear on carbon nanobute. Under low pressure condition, deflection difference onequi-increase of pressure between no damping and damping simulation is larger than that on highpressure. The results of forced vibration indicate that system response consist of transient andsteady-state response. With steps of molecular dynamic simulation increasing, transient responsedisappears gradually, so system response includes only steady-state response, which is simpleharmonic vibration with the same frequency as excitation force. These results are in accord with theclassical vibration theory. Moreover they will provide theoretic foundation for designing ofnanostructure device
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.631.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Enhancement of Blue Emission via Upconversion in Solid-State Synthesized Hexagonal NaYF〈sub〉4〈/sub〉:Ln〈sup〉3+〈/sup〉 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 398-401 
    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: Hexagonal NaYF4:Ln3+ (Ln3+=Yb3+ and Tm3+) was prepared via solid-state synthesis route.The synthesized powders were identified with X-ray diffraction patterns. Hexagonal phase was obtainedby heating the powders at 550ºC in reducing atmosphere, and the ions of Yb3+ and Tm3+ were completelyincorporated into the lattice of hexagonal NaYF4 in the doping concentration range. Microstructure of thephosphor was observed by scanning electron microscopy (SEM). Intense blue (1G4→3H6, 1D2→3F4) andweak red (1G4→3F4) upconversion emission of Tm3+ ions with the energy transferred from Yb3+ ions wereobserved in the phosphor excited with a 980nm continuous wave laser diode. The intensity of blueemission was effectively enhanced by suitable doping of Tm3+ and Yb3+ ions, and strongest blue emissionwas obtained with the concentration of 0.2mol% Tm3+ and 40mol% Yb3+ doped
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.398.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of APTES Modified Bioglass (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1215-1217 
    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: Bioglass (BG) particles were treated by 3-aminopropyltriethoxysilane (APTES) in order toimprove the interface compatibility with polymer materials. The surface structures of modified BG werecharacterized through Fourier transformed infrared spectroscopy with attenuated total reflectance accessory,thermogravimetric analysis, differential scanning calorimetry analysis and X-ray photoelectronspectroscopy. The results showed that APTES was successfully grafted on the surface of BG. The biomineralizationproperties of APTES modified bioglass were also studied through FTIR, XRD and SEM.Results showed that hydroxylcarbonateapatite (HCA) was formed on the surface of modified BG aftersoaked into SBF solution. It was shown that the APTES modified BG could possess good mineralizationproperties and could be intended as a composition of scaffolds for bone tissue engineering applications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1215.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    A Novel Thermo-Sensitive Polymer Film and its Imaging Properties (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 373-374 (Mar. 2008), p. 658-661 
    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: Three copolymers containing isobutyl p-styrenesulfonate (IBSS) and carboxyl units, i.e.methyl methacrylate (MMA) and methacrylic acid (MAA), were synthesized and their chemicalstructures and thermal behaviors were investigated by using TGA, DSC, FTIR and other methods.Films were prepared by using the synthesized copolymers in combination with a bisvinyl ethercompound, i.e. 2,2-bis(4-(2-(vinyloxy)ethoxy)phenyl)propane (BVPP), to applied onto an aluminumplate. Crosslinking and de-crosslinking reactions would readily take place when the polymer filmswere baking treated at 100 oC and 200 oC for a short period of time, respectively. Along with thechemical structural changes during thermal treatments, an affinity change was achieved from beinginsoluble to completely soluble in neutral water. A positive-working and neutral water-developableimaging material was proposed and preliminary studies on the imaging properties were conducted
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.373-374.658.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Damage Constitutive Model and Failure Mechanism of Lead-Free Solder in CBGA Package (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 77-84 
    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: A viscoplastic constitutive model with void damage is developed to analyze themacroscopic mechanical response and damage mechanism of lead-free solder alloy in CBGApackaging under cyclic thermal loading. The constitutive model is implemented into ABAQUSthrough its user defined material subroutine. Two-dimensional nonlinear finite element analysis of aceramic ball grid array(CBGA) package is conducted to simulate the viscoplastic deformation anddamage failure process of the lead-free solder joint under cyclic thermal loading. The damage modelis helpful for optimization and reliability of electronic package
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.77.pdf
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