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  • 1
    Electronic Resource
    Electronic Resource
    Properties of Nano-Hybrid Sol-Gel Materials Synthesized from Colloidal Silica-Silane Containing Epoxy Silane (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2278-2281 
    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 kinds of colloidal silica (CS)/silane sol solutions were synthesized in variation withparameters such as different acidity and reaction time. Sol solutions were prepared from HSA CS/methyltrimethoxysilane (MTMS), LS CS/MTMS and LS CS/MTMS/γ -Glycidoxypropyltri methoxysilane(ES) solutions. In order to understand their physical and chemical properties, sol-gel coating filmswere fabricated on glass. Coating films on glass, obtained from LS/MTMS sol, had high contact angle,also, much enhanced flat surface in the case of LS/MTMS sol was observed in comparison with HSA/MTMS sol. From all sol-gel solutions, seasoning effect of for enhancing properties of sol-gel coatinglayer on glass was observed while such sol-gel solutions were left for 7days. In initial stage of sol-gelreaction, all most of sol solutions used in this work seem to be unstable, formation of coating films was alittle hazy and rough. However, improved coating films as observed in 4days later. LS/MTMS/ES solsolutions were synthesized with ES, adding to LS/MTMS sol. Contact angle of LS/MTMS/ES sol-gelcoating films decreased, since ES played a role in forming hydrophilic hydroxyl sol. The elastic portion ofcoating films prepared from LS/MTMS/ES sol increased with addition of ES, but thermal stabilitydecreased a little
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2278.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Fillers on Electrical Properties of PTFE Composites for Circuit Breaker (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1038-1042 
    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: This paper presents the effects of fillers on electrical properties of PTFE composites fornozzle of circuit breaker. PTFE has been used widely as a material for circuit breaker nozzle. Addingsome filler into PTFE material is expected to be efficient for improving the endurance against arcradiation. In this experiment, effects of fillers on electrical properties such as dielectric constant,dissipation factor, electrical resistivity, dielectric strength and corona resistance of PTFE compositeswere investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1038.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Properties of Sol-Gel Coating Film from Colloidal Silica-Silane Sol (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 813-816 
    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: Two kinds of colloidal silica(CS)/silane sol solutions were prepared. Two sol solutions areinvolved with the kinds of silane such as methyltrimethoxysilane(MTMS) and [removed info] -Glycidoxypropyltrimethoxysilane(ETMS) using LS CS. MTMS was added to two sol solutions. Whether ETMS wasadded or not, two kinds of sol solutions were synthesized. Using two kinds of sol solutions, sol-gelcoating films were formed on glass substrates via dip-coating process. Here, seasoning effect of forenhancing properties of sol-gel coating layer on glass was investigated while such sol-gel solutionswere left for 7days. Also, their properties such as surface free energy, roughness, thermal property,potential hardness and elastic portion were characterized in order to understand the effect of additionof ETMS. In this case of LS/MTMS sol, the coating film had low surface free energy and moreenhanced flat surface than that of the case of LS/MTMS/ETMS sol. ETMS forms hydrophilichydroxyl group in sol solution, then surface free energy of LS/MTMS/ETMS coating film increased.In the beginning of reaction sol solution seemed to be unstable, but 4days later their coating filmproperties such as surface free energy and roughness enhanced. The elastic portion of coating filmsobtained from LS/MTMS/ETMS sol increased with addition of ETMS, but thermal stabilitydecreased
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.813.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Properties of Nano-Hybrid Sol-Gel Coating Films Synthesized with Colloidal Silica and Organoalkoxy Silanes (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 569 (Jan. 2008), p. 69-72 
    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: Three kinds of colloidal silica (CS)/silane sol were prepared. Sols are involved with thekinds of silane with different organic group. Methyltrimethoxysilane (MTMS) has the three methoxygroups and a methyl group. γ-Glycidoxypropyltrimethoxysilane (GTMS) has the three methoxygroups and a bulky epoxy group. GTMS was added to two sols with different amount. When solreacted for 10 days, viscosity increased dramatically. Trasnmittance of sols reacted for 10 daysdecreased rapidly, too. It indicated the stability of sol degraded. Sol-gel coating films were formed onglass substrate using spin coating procedure with reaction time for 10 days. Coating films were flatand transparent without cracking. CS/MTMS coating films showed high contact angle. When largeamount of GTMS was added, contact angle decreased due to its epoxy group. No thermal degradationof CS/MTMS coating film occurred up to 600 oC. CS/MTMS/GTMS coating film degraded at 400 oCfor decomposition of epoxy group which has long organic chain which easily degraded by the thermalshock
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.569.69.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Properties of Sol-Gel Coating Film Synthesized from Nano Boehmite and Methyltrimethoxysilane (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 1041-1044 
    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: Several sol solutions were synthesized by using two kinds of nanosized boehmite andmethyltrimethoxysilane (MTMS) according to the changing amount of MTMS at different reactiontime. To understand their physical and chemical properties, sol-gel coating films were fabricated onglass. The sol solutions were prepared from boehmite of spherical shape (boehmite1)/MTMS andmixed boehmites of spherical and fibrous shapes (boehmite2)/MTMS. The soluble stability ofboehmite1/MTMS was observed in the sol solution left for 24 h, however, that of boehmite2/MTMSwas observed in the sol solution left for 48 h. The contact angle of sol-gel coating films fromboehmite/MTMS increased with MTMS contents and reaction time. The films formed a flat surfacewith the increasing MTMS contents and decreasing reaction time. The electrical resistivity of filmsincreased with MTMS contents. The thermal degradation of films occurred at approximately 400 oC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.1041.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    The Effect of Fiber Winding Angles on the Bending Strength of Fiber-Reinforced Plastic Rods (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 661-664 
    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: Fiber-reinforced plastics consist of fibers of high strength and modulus embedded in, orbonded to a matrix with distinct interfaces between them. Because fiber configuration plays a key rolein determining mechanical strength of fiber-reinforced plastic rods, especially bending strength offiber-reinforced plastic rods was measured and simulated numerically in variation with windingangles. Also, stress distribution in fiber-reinforced plastic rods was simulated numerically under thecondition of constant bending load to fiber-reinforced plastic rods. The measured bending strength offiber-reinforced plastic rods in variation with winding angles was different from that of simulated.The difference between measured and simulated results was due to the effect of shear stresses on thestrength of fiber-reinforced plastic rods
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.661.pdf
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