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  • 1
    Electronic Resource
    Electronic Resource
    Highly Ordered Macroporous BN-Based Ceramics Prepared from Templated Preceramic Polymers (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 287 (June 2005), p. 323-328 
    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: Macroporous SiCBN and BCN ceramic were prepared by infiltrating these preceramic polymers into the colloidal silica crystalline array, followed by pyrolysis at 1400ı and subsequently etching off the silica spheres. It is generally observed by SEM and TEM that a highly ordered and interconnected 'honeycomb' pore structure was obtained by replicating the three dimensional close packed silica spheres which was fabricated by natural sedimentation. And BET surface areas in range 413 ~ 315 m2/g and pore sizes of 113 ~ 395 nm in the porous materials were tailored by controlling the sacrificial silica sphere sizes in range 145~500 nm even under volume shrinkage involved during pyrolytic step. The porous SiCBN ceramics and BCN ceramic showed a slight weight loss of 0.2~0.8% and 4%, respectively, indicating excellent resistance to oxidation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.287.323.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Facile Synthesis of SiCN Ceramic Foam via Self-Sacrificial Template Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 727-730 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Non-oxide ceramic SiCN possesses unique physical and chemical properties, which makeit a suitable material for various applications such as catalyst support, high temperaturesemiconducting devices, and metal or polymer matrix composites. In this work, SiCN foams withpore size of 500 and 1000 nm and high BET surface area of 184.5 and 71 m2/g were prepared usingpreceramic polymer, polyvinylsilazane, as a precursor and polystyrene sphere packed bed as aself-sacrificial template. The polystyrene sphere packed bed was prepared by the naturalsedimentation of spheres. After the infiltration and curing of viscous preceramic polymer, the samplewas pyrolyzed at 1000 ºC under N2 atmosphere to produce the ceramic foams. It is a very simplesynthesis because in the process of pyrolysing preceramic polymer, the polystyrene sphere templatewas removed simultaneously by pyrolysis with no additional etching step. SEM, N2adsorption-desorption measurement and TGA were used to characterize the obtained samples. It wasconcluded from the TGA measurement that the obtained SiCN foam possessed very high thermalstability at 1000 ºC under air
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.727.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization and Fabrication of Nano-Sized Patterns and Microfluidic Channels Derived from Polyvinylsilazane via Soft Lithographic Technique (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 677-680 
    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: Interests on the fabrication of microfluidic devices have increased in the fields of micrototal analysis system (μ-TAS) and MEMS (Microelectromechanical systems) due to their chemicalinertness and high thermal stability. The thermal characterization of the SiCN preceramic polymer,polyvinylsilazane, showed that the cured polymer has ceramic properties at heat treatmenttemperature of 600 oC or above. In the characterization of the mechanical properties, the characteristicvalues of the elastic modulus and hardness notably increased for the heat-treated SiCN. The presentstudy describes the preparation of nano-sized patterns and microfluidic channels using a softlithographic technique. The study shows that the fabrication of microchannels using the curedinorganic polymers holds tremendous potential in the field of microfluidics, where materials withhigh optical transparency, thermal stability and chemical inertness are in demand as niche betweenconventional microfluidics using glass and polymeric materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.677.pdf
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    Paper (German National Licenses)
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