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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 22 (1991), S. 355-358 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Production, Properties and Applications of metallic Short FibersFor the production of metallic short fibres, the crucible melt extraction process (CME) gives the possibility of going new ways in materials research by using rapid solidification effects. On the basic of technological and material-specific investigations fibre geometry and material properties should be utilized. Following application projects are provided:-Production of extreme fine-fibres (〈50 m̈m) as raw material for high-porous materials-Fibres for the heterogeneous catalysis-Direct production of MMC-particlesOther fields of application are created with the metallic short fibres as an insert and reinforcement component for polymers and friction materials as well as raw materials for pigment production.
    Notes: Das Schmelzextraktionsverfahren (CME) für die Herstellung von metallischen Kurzfasern bietet die Möglichkeit. Unter Ausnutzung der Effekte der Schnellabkühlung neue Wege in der Werkstofftechnik zu gehen.Anhand durchgeführter verfahrenstechnischer und werkstoffspezifischer Grundlagenuntersuchungen sollen hierbei die Fasergeometrie und Werkstoffeigenschaften gezielt ausgenutzt werden. Als Zielstellung sind folgende applikationsnahe Projekte vorgesehen:-Herstellung von Feinstfasern (〈50 m̈m) als Ausgangskomponente für hochporöse Werkstoffe-Faserwerkstoffe für heterogene Katalyse-Direktherstellung von MMC-TeilchenWeitere Anwendungsgebiete ergeben sich mit der metallischen Kurzfaser als Einlagerungs- und Verstärkungskomponente für Polymerwerkstoffe, Friktionswerkstoffe sowie als Ausgangskomponente für die Pigmentproduktion.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2018-04-07
    Description: Adaptive hydrogels, often termed smart materials, are macromolecules whose structure adjusts to external stimuli. Responsive micro- and nanogels are particularly interesting because the small length scale enables very fast response times. Chemical cross-links provide topological constraints and define the three-dimensional structure of the microgels, whereas their porous structure permits fast mass transfer, enabling very rapid structural adaption of the microgel to the environment. The change of microgel structure involves a unique transition from a flexible, swollen finite-size macromolecular network, characterized by a fuzzy surface, to a colloidal particle with homogeneous density and a sharp surface. In this contribution, we determine, for the first time, the structural evolution during the microgel-to-particle transition. Time-resolved small-angle x-ray scattering experiments and computer simulations unambiguously reveal a two-stage process: In a first, very fast process, collapsed clusters form at the periphery, leading to an intermediate, hollowish core-shell structure that slowly transforms to a globule. This structural evolution is independent of the type of stimulus and thus applies to instantaneous transitions as in a temperature jump or to slower stimuli that rely on the uptake of active molecules from and/or exchange with the environment. The fast transitions of size and shape provide unique opportunities for various applications as, for example, in uptake and release, catalysis, or sensing.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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