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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 234-242 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A machine is described which allows bicrystals of metals and ceramics to be made by pressure bonding at temperatures up to 1500 °C in ultrahigh vacuum (UHV). The mutual orientation of the two component crystals can be adjusted to within 0.1°. The surfaces to be bonded can be sputter cleaned with Ar ions while monitoring by Auger electron spectroscopy, and dopants can be applied by evaporation in a separate chamber. The machine allows the production of bicrystals with interfaces of precisely defined crystallography and chemistry. The specimen size is sufficient for fracture mechanical characterization of interface strength. The performance of the machine is illustrated with data for niobium-sapphire bicrystals. The machine has been shown to produce bicrystal interfaces whose purity is not measurably impaired by atmospheric contaminants. Fracture resistant levels of Nb-Al2O3 interfaces bonded at 1700 °C in ordinary high vacuum are reached in the UHV machine already at 1000 °C. Going to temperatures around 1450 °C raises the fracture resistance to more than twice the level obtained in ordinary high vacuum at 1700 °C.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Biomaterials 2 (1991), S. 273-276 
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Fibroblasts in culture and in vitro have been shown to interact with certain surface morphological phenomena. It was the aim of the present study to determine cellular morphological interactions with surface grooves of subcellular dimensions. The silicon oxide layer of a wafer was photoetched, which resulted in a regular micromorphology with linear rectangular shaped microbars and microgrooves 1, 1.5, and 2 μm in diameter and distance from each other. Human fibroblasts were seeded on the sterile specimen and incubated for 48 h. Fluorescence microscopy of the plates revealed that all the cells were aligned parallel to the etched grooves on the test specimen, whereas on the controls the cells were randomly orientated. It could be demonstrated by scanning electron microscopy that single cels were flattened over the surface and conformed to the silicon microgrooves. This indicates that fibroblasts are orienting during adhesion and conform to the surface microtexture to gain a maximum contact area on the presented surface.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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