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  • 1
    Electronic Resource
    Electronic Resource
    Luminance Efficiency of a (La,Tb,Ce)PO〈sub〉4〈/sub〉:Eu Phosphor Layer Prepared with Binary Surface Active Organic Molecules (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 443-446 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The effect of a binary surfactant on the luminance efficiency of a green phosphor wasinvestigated with an emphasis on the chemical control of interactions between the suspensioncomponents. The dispersion system of the green phosphor paste was designed by an evaluation of theacid and base properties of the green phosphor and the surface active organic molecules by anon-aqueous titration method. Oleyl amine and 4-(1,1,3,3-tetramethylbutyl) phenyl-polyethylenephosphoric acid (hereafter SAIT7) were added into the green phosphor paste taking into account theratio between the acid and base sites of the green phosphor particle’s surface. This resulted in a highermaximum solid loading and a further decrease in the viscosity of the green phosphor paste comparedto a single addition of SAIT7 and oleyl amine. The green phosphor paste with the binary surfactantexhibited a much improved photoluminescence intensity and homogeneity of the emission propertiesthan a single addition of the dispersant
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.443.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    The Effects of Hot Band Annealing Temperature on the Texture of 1% an 2%Si Nonoriented Electrical Steels (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 701-706 
    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: The effects of hot band annealing temperature on the texture of the 1% and 2%Sinonoriented electrical steel were investigated. Slab was hot rolled and then hot band annealed in thetemperature range of 900℃~1100℃. The magnetic flux density and the core loss were improved bythe hot band annealing because of the texture improvement. As the hot band annealing temperaturewas increased, the magnetic properties were improved. The microstructure of the hot band wascomposed of a recrystallized structure at the surface and a deformed structure near the middle plane.These hot bands were completely recrystallized after annealing above 1000℃. The main texture ofthe hot band was rotated cube and gamma-fibre. After hot band annealing, rotated cube changed tocube texture and gamma-fibre intensity gradually decreased. In the case of specimen without hot bandannealing, rotated cube in the middle plane was changed to near {111}〈112〉texture and Goss texturein the surface to gamma fibre after final annealing. In the case of the hot band annealed at 900℃, Gosstexture and cube texture were developed. After final annealing, the {111} and {112} texture wasdramatically decreased as the hot band annealing temperature was increased. Although the total{100} texture intensity was not changed, Cube texture, {100}〈001〉, was strengthened and rotatedcube texture, {100}〈011〉, weakened for 2% Si steel. However, 1% Si steel was opposed to 2% Sisteel. The {110} texture was strengthened irrespective of hot band annealing temperature. As the hotband annealing temperature was increased, the Goss texture was strengthened, and this makes theanisotropy of the magnetic flux density bigger
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.701.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Performance of Photocatalysis/Chemical Oxidants in Aqueous TiO〈sub〉2〈/sub〉 Suspensions (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 569 (Jan. 2008), p. 29-32 
    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 study was conducted to evaluate the effect of a photocatalysis/oxidant system for thetreatment of humic acid and heavy metals in aqueous solutions. Hydrogen peroxide, ozone andpotassium peroxodisulfate were tested as oxidants. The effect of the oxidant concentration wasconducted with a pH of 7, a UV intensity of 64 W and a TiO2 dosage of 0.3 g/L. The addition ofoxidants over the amounts of H2O2 50 mg/L, O3 20 g/m3 and K2S2O8 50 mg/L inhibits the systemefficiency. The negative effect of the high concentration of oxidants likely results from OH radicalquenching caused by the excess oxidant. Therefore, the optimal dosages for the oxidants such as ahydrogen peroxide, ozone and potassium peroxodisulfate were found to be 50 mg/L, 20 g/m3 and 50mg/L, respectively. The addition of an oxidant in the UV/TiO2 system enhanced the degradationefficiency of humic acid and heavy metals compared to no addition of an oxidant. The degradationefficiency of humic acid and heavy metals was much greater for the UV/TiO2/H2O2 system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.569.29.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Texture Evolution during Recrystallization in Nonoriented Electrical Steels (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 550 (July 2007), p. 533-538 
    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: In nonoriented electrical steels, the control of texture has received little attention, andhence there is an unexplored possibility to improve the magnetic properties of nonoriented steelsthrough texture control. Furthermore, the formation of recrystallization texture in these steels has notyet been systematically studied. In this study, such systematic investigations are undertaken fornonoriented electrical steels with 2% Si. New information obtained from EBSD measurements onpartially recrystallized specimens will allow us to know what is happening during the recrystallizationstage. The formation of recrystallization texture is much better explained by oriented nucleation. Thisis supported by the fact that the area fraction of nuclei or recrystallized grains with specificorientations for all new grains remains almost constant during the progress of recrystallization. Mostnuclei have a high misorientation relationship with the surrounding deformed matrix: 25~55[removed info]. Themain texture components of nuclei or recrystallized grains during the progress of recrystallization areGoss and {111}〈112〉. Deformed {111}〈110〉 and {111}〈112〉 grains generally disappear at theearly stage of recrystallization whereas deformed {001}〈110〉 and {112}〈110〉 grains are mostlyconsumed at the late stage of recrystallization
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.533.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    The Effects of Hot Band Annealing Temperature on the Texture of 2%Si Nonoriented Electrical Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 550 (July 2007), p. 527-532 
    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: The effects of hot band annealing temperature on the texture of the 2%Si nonorientedelectrical steel were investigated. Slab was hot rolled and then hot band annealed in the temperaturerange of 900℃~1100℃. The magnetic flux density and the core loss were improved by the hot bandannealing because of the texture improvement. As the hot band annealing temperature was increased,the magnetic properties were improved. The microstructure of the hot band was composed of arecrystallized structure at the surface and a deformation structure near the middle plane. These hotbands were completely recrystallized after annealing above 1000℃. The main texture of the hot bandwas rotated cube and gamma-fibre. After hot band annealing, rotated cube changed to cube textureand gamma-fibre intensity gradually decreased. In the case of non-annealed hot band, rotated cube inthe middle plane was changed to near {111}〈112〉texture and Goss texture in the surface to gammafibre after final annealing. In the case of the hot band annealed at 900℃, rotated cube near the middleplane changed to Goss texture and Goss texture in the surface to rotated cube after final annealing.After final annealing, the {111} and {112} texture was dramatically decreased as the hot bandannealing temperature was higher. The total {100} texture intensity was not changed. Cube texture{100}〈001〉 increased and rotated cube texture {100}〈011〉 decreased. The {110} texture increasedafter hot band annealing irrespective of temperature. As the hot band annealing temperature washigher, the Goss texture increased, and this increase of Goss texture causes the anisotropy of themagnetic flux density
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.527.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    A Chemical Route to Large-Scale Preparation of Spherical and Monodisperse Ni Powders (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A facile chemical route to prepare a well-defined Ni powder on a mass-production scale without external heating was suggested. A highly concentrated Ni complex was formed between NiCl2 and N2H4 solution, and subsequent addition of NaOH solution triggered serial reactions from the Ni complex decomposition via Ni(OH)2 formation to the reduction of a Ni(OH)2 gel into well-defined Ni spheres. The high temperature necessary for the reaction was attained not by external heating but by exothermic reactions such as complex formation and reduction. The preparation of monodisperse and spherical Ni powder was attributed to uniform distribution of the reducing agent (N2H4) within the Ni(OH)2 gel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00582.x
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  • 7
    Electronic Resource
    Electronic Resource
    Carbothermic Synthesis of Monodispersed Spherical Si3N4/SiC Nanocomposite Powder (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The synthesis and structure of a monodispersed spherical Si3N4/SiC nanocomposite powder have been studied. The Si3N4/SiC nanocomposite powder was synthesized by heating under argon a spherical Si3N4/C powder. The spherical Si3N4/C powder was prepared by heating a spherical organosilica powder in a nitrogen atmosphere and was composed of a mixture of nanosized Si3N4 and free carbon particles. During the heat treatment at 1450°C, the Si3N4/C powder became a Si3N4/SiC composite powder and finally a SiC powder after 8 h, while retaining its spherical shape. The composition of the Si3N4/SiC composite powder changed with the duration of the heat treatment. The results of TEM, SEM, and selected area electron diffraction showed that the Si3N4/SiC composite powder was composed of homogeneously distributed nanosized Si3N4 and SiC particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb02139.x
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  • 8
    Electronic Resource
    Electronic Resource
    Pyrolytic Conversion of Spherical Organo-silica Powder to Silicon Nitride under Nitrogen (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Monodisperse, spherical Si3N4 powder composed of fine particulates was synthesized by pyrolyzing spherical organo-silica powder under nitrogen. The organo-silica powder was prepared by hydrolyzing a mixture of phenyltrimethoxysilane (PTMS) and tetraethoxysilane (TEOS) in a methanol solution of water and ammonia. The organo-silica powder consisted of 81.3 at.% silicon units derived from PTMS and 18.7 at.% silicon units derived from TEOS. During the pyrolysis under nitrogen, the organo-silica powder decomposed to a mixture of free carbon and silica, with an increase of the surface area, at 500°-600°C, followed by the formation of alpha-Si3N4, with ß-Si3N4 as a minor phase, at 1450° and 1500°C and ß-SiC at 1550°C. The pyrolyzed powders, which retained the spherical shape and monodispersity of the organo-silica powders, with a reduction in mean particle diameter, were composed of fine particulates that were ~40 nm in size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02624.x
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  • 9
    Electronic Resource
    Electronic Resource
    Formation and Characterization of Monodisperse, Spherical Organo-Silica Powders from Organo-Alkoxysilane-Water System (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Monodisperse, spherical organo-silica powders were synthesized from an immiscible mixture of an aqueous NH4OH solution and organo-alkoxysilanes, such as phenyl-trimethoxysilane (PTMS), methyltrimethoxysilane (MTMS), and methyltriethoxysilane (MTES). When the organo-alkoxysilanes were added to the aqueous NH4OH solution with stirring, organo-alkoxysilane/water macroemulsions were formed because of the immiscibility of the aqueous NH4OH solution and the organo-alkoxysilane. In the emulsion, organo-alkoxysilane droplets dissolved into the water phase through the droplet-water interface, and the organo-silica powder was formed by the hydrolysis and condensation of the organo-alkoxysilane. The powders were obtained reproducibly under broad concentrations of organo-alkoxysilanes; 0.3-1.5 mol/L for PTMS, 0.3-0.6 mol/L for MTMS, and MTES, with concentrations of ammonia between 0.0625 and 2.0 mol/L. According to the analysis of the solid-state MAS 29Si NMR and the 13C NMR analysis, the organo-silica powder did not contain any residual alkoxy groups, only carbon sources from nonhydrolyzable R groups: phenyl groups in PTMS, and methyl groups in MTMS and MTES.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02466.x
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  • 10
    Electronic Resource
    Electronic Resource
    Hydrothermal Synthesis of Spherical Perovskite Oxide Powders Using Spherical Gel Powders (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Spherical perovskite oxide powders, composed of fine particulates, were prepared by using spherical gel powders under hydrothermal conditions. Spherical PbTiO3, BaTiO3, and SrTiO3 powders were synthesized from spherical TiO2 gel powders, and spherical PbZrO3 powder from spherical ZrO2 gel powder. Spherical Pb(Zr0.5, Ti0.5)O3 and Ba(Zr0.5,Ti0.5)O3 powders were prepared from spherical ZrTiO4 gel powders. Lead acetate trihydrate, barium hydroxide octahydrate, and strontium hydroxide octahydrate were used as the sources of A-site ions in each perovskite oxide (ABO3). The spherical TiO2 and ZrO2 gel powders were prepared by thermal hydrolysis of titanium tetrachloride and zirconium oxychloride, respectively, and spherical ZrTiO4 gel powder by thermal hydrolysis of a mixture of them in alcohol-water mixed solvent. During the hydrothermal treatment, the spherical gel powders retained their spherical shape to produce spherical perovskite oxide powders, composed of nanometer-sized particulates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02490.x
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