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  • 2005-2009  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Adsorption of Biomolecules on Ceramic Particles and the Impact on Biomedical Applications (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 741-751 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Protein adsorption onto metal oxide surfaces is an essential aspect of the cascade ofbiological reactions taking place at all interfaces between implanted materials and thebiological environment. The types and amounts of adsorbed proteins mediate subsequentadhesion, proliferation and differentiation of cells. Protein adsorption to surfaces of metaloxides and their kinetics are important in the formation and growth of seashells, one of thetoughest natural ceramics, in modern bio-analytical devices as well as in bone and teethimplant technology. This paper describes results obtained in a feasibility study of how to usemetal-oxide particles to obtain biosensors with a high turnover. The most important featuresof proteins are outlined describing them as purpose-built "polymers" from amino acids withspecific conformations. Some key aspects of Metaloxide (MeO) surfaces in water and theinfluence of electrostatic and hydrophobic interaction on protein adsorption are reported.Results concerning the interaction between different proteins and MeO surfaces in water arediscussed in detail. Examples of purely electrostatic interactions of proteins with MeOsurfaces as well as the influence of hydrophobic interaction are elucidated. An outlook of theimplications of the new insights on natural and synthetic materials will be given concerningbio-compatibility, bio-mineralization and self assembly of materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.741.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nucleation and Grain Growth Kinetics of Amorphous to Nanocrystalline Ceria Solid Solutions (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 1339-1344 
    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: Nanocrystalline ceria-based thin films are of potential interest for use as gas-sensing layers andelectrolytes in micro-Solid Oxide Fuel Cells (micro-SOFC) used for energy supply of nextgeneration portables. In these devices the thin films have to be operated at intermediate to hightemperatures (500 - 1000 °C) to be sufficiently high electrical conductive. However, only little isknown on the nucleation and grain growth kinetics of pure ceria and its solid solutions when presentas nanocrystalline thin film microstructures (average grain size 〈 100 nm). In this study amorphous,dense and crack-free CeO2 and Ce0.8Gd0.2O1.9-x thin films have been deposited by spray pyrolysis onsapphire. These films were crystallized to biphasic amorphous-nanocrystalline and fullynanocrystalline microstructures upon annealing with respect to time, temperature, heating rate anddoping. Nucleation and grain growth kinetics were studied by differential scanning calorimetry, Xraydiffraction analysis with in-situ heating chamber and scanning electron microscopy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.1339.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Sintering Analysis of Undoped and Cobalt Oxide Doped Ceria Solid Solutions (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Pure and CoO1–x-doped Ce0.8Gd0.2O1.9 (CGO) have been analyzed with constant heating rate dilatometry. Doping changes the grain boundary structure of CGO resulting in enhanced mass transport and in increased densification rates. Significant changes in activation energies have been detected. While pure CGO exhibits a significant amount of surface diffusion, cobalt oxide doping enhances grain boundary diffusion. The obtained activation energies are 4.70±0.32 eV for CGO and 6.24±0.32 eV for CoO1−x-doped CGO. The higher activation energy of CoO1−x-doped CGO is a result of the formation of intergranular films. It is suggested that sintering of CoO1−x-doped CGO occurs by rearrangement and grain boundary diffusion whereas grain boundary and volume diffusion govern the densification of pure CGO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00567.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of Short-Chain Carboxylic Acids on the Mechanical Properties and Structure of Coagulated Alumina Suspensions (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Three different short-chained carboxylic acids, formic, acetic, and propionic acid, were compared as additives to increase the green strength of wet particle networks produced with the direct coagulation casting process, which allows the internal coagulation of a suspension. Small acid additions do not alter the favorable low viscosity of the stabilized slurry, and yet increase the compressive strength of wet coagulated bodies. The strengthening effect increases with increasing chain length of the carboxylic acid. The maximum effect was observed upon addition of propionic acid (0.3 wt% to alumina), which resulted in a sixfold increase in compressive strength of wet coagulated bodies compared with that without propionic acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00470.x
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanics and Microstructures of Concentrated Particle Gels (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It is often assumed that the viscoelastic properties of dense colloids are determined by the colloid volume fraction, the interaction potential, as well as the particle size distribution and shape. The dependence of the viscoelastic behavior of particle suspensions and gels on these parameters has been widely studied, and is well understood in many cases. In contrast, our knowledge on the influence of microstructure on mechanical and rheological properties, in particular for high solid loading suspensions as used in ceramic processing, is much less developed. This aspect has been the focus of recent experiments, which show that small changes in microstructure can have dramatic effects on the mechanics and dynamics of concentrated colloidal gels. In this article, we attempt to give an overview of the influence of microstructure on the mechanical and rheological properties of colloidal systems. Particular attention is given to colloidal particle gels at high volume fractions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00622.x
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  • 6
    Electronic Resource
    Electronic Resource
    Roles of Dopants in Sintering Behavior of ZnO-Based Varistor (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 479-482 
    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 series of ZnO-based materials with different doping levels were prepared. The correlationbetween the composition and microstructure, and the roles of main dopants, Bi2O3 and Sb2O3, in thesintering behaviors were proposed. Both Bi2O3 and Sb2O3 evaporated at 1115°C, but the amount of them,in which bismuth is the majority, is not significant. Bi2O3 functioned mainly as liquid during sintering topromote the sintering of ZnO, but it doesn’t mean the materials will be denser. The bismuth-rich phaseretracted into small pores during cooling, leaving the big pores as voids at room temperature. More Bi2O3added would result in less increase in material densities and dramatic decrease in relative densities, and alittle bit increase in grain sizes of matrix ZnO. Sb2O3 would react with ZnO matrix into spinel, Zn7Sb2O12,which will pin at the grain boundary of ZnO to control the ZnO grain growth. The more Sb2O3 added, thesmaller the grain sizes of ZnO. Appropriate amount of Sb2O3 added will yield denser materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.479.pdf
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