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  • 1
    Electronic Resource
    Electronic Resource
    Tribological and Mechanical Properties of Carbon Nanofiber-Filled PTFE Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 975-978 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The tribological and mechanical properties of carbon nanofiber (CNF)-filledpolytetrafluoroethylene (PTFE) composites with different filler proportions werestudied. The worn surfaces of PTFE and carbon nanofiber/PTFE (CNF/PTFE)composites were then examined with scanning electron microscope (SEM). Theresults show the friction properties of CNF/PTFE composites decreased thenincreased with the increasing content of CNFs, while the anti-wear properties ofCNF/PTFE composites were much higher than that of pure PTFE. The best anti-wearproperty was obtained with the composite containing 2 wt.% CNFs. The wear volumeloss of the composite contained 2 wt.% CNFs was only about 1/700 that of PTFEwithout CNFs under the condition of 150N and 1.4m/s. Meanwhile, the results alsoindicate that the mechanical properties of CNF/PTFE composites increased thendecreased with the increasing filler concentration, and the composite contained 1wt.% CNFs has the best mechanical properties. Compare to pure PTFE, the tensilestrength and the elongation of CNF/PTFE composites increased about 20% and 70%respectively when the filler content is 1 wt.%. It was seen from the worn surfacesmicrographs of PTFE and CNF/PTFE composites that CNFs greatly reduce theadhesive wear of PTFE
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.975.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Control of Surface Morphologies and Crystal Structures of Potassium Titanate Fibers by Flux Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 201-204 
    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: In this work, flux method is used to control the surface morphologies and crystalstructures of the fine K2Ti6O13 fibers. When K2CO3 as a flux is added into fine K2Ti6O13 fibers andheated at 1100oC for 2h, the crystal of fibers are transformed to K2Ti4O9 and K2Ti2O5, however, theresulting fibers have no significant change in morphologies. On the other hand, when KCl is used asflux (15wt%) and heated at 1200oC for 2h, the diameters of the resulting fibers become about 2micron without any change of the crystal structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.201.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Tribological and Mechanical Properties of PTFE Composites Filled with the Combination of Short Carbon Fiber and Carbon Nanofiber (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 689-692 
    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 tribological and mechanical properties of polytetrafluoroethylene (PTFE)composites filled with carbon nano-fiber (CNF), short carbon fiber (SCF) and the combination ofthem were studied. The results indicate that the wear volume loss of the PTFE composite filledwith CNF or SCF, in comparison with that of pure PTFE, decreases by 1~2 orders of magnitude.And the best wear resistant composition is achieved by the combination of SCF with CNF; as anexample, PTFE+2 wt% CNF+18 wt% SCF exhibits a specific wear volume loss of 0.88 mm3,which is about 11 times lower when compared to the PTFE composite filled with 18 wt% SCF.Meanwhile, the results also show that the tensile strength of SCF or CNF filled PTFE compositesis better than that of pure PTFE. However, the combination of the two fillers decreases thetensile strength of PTFE composites. Worn surfaces were investigated using a scanning electronmicroscope, from which it is assumed that a mechanism of rolling effect, due to the filling ofnanoparticles, which has a positive protective effect for PTFE matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.689.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Model for describing activity coefficients in mixed electrolyte aqueous solutions (1993)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 39 (1993), S. 1527-1538 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Most models for describing activity coefficients in ionic solutions are only appropriate for single aqueous electrolyte solutions. Extensions to mixed electrolyte solutions are rarely found and are often unreliable, especially at higher electrolyte concentrations. A new model is developed by combining ionic solvation equilibria and physical interaction forces. It is shown that by using the parameters correlated from single electrolyte aqueous systems, the activity coefficients in mixed electrolyte aqueous solutions can be accurately predicted up to the solubility limit, for example, at very high ionic strength.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690390912
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