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  • 1
    Electronic Resource
    Electronic Resource
    Preparation of Nickel Nanoparticles in Water-in-Oil Microemulsion (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1193-1196 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Nickel nanoparticles were prepared by reduction of nickel-hydrazine complex with sodiumborohydride (NaBH4) in water-in-oil (w/o) microemulsion of PVP/ethanol/toluene/water at 50[removed info]C. Itwas investigated through SEM and TEM photographs that the nickel nanoparticles with a diameter15~20nm were nearly monodispersed. By the analysis of XRD, the resulting particles werecharacterized to be pure crystalline nickel with a face-centered cubic structure. The results indicatethat the size, shape and distribution of particles depend on the mole ratio of [water]/[PVP] and[NaBH4]/[Ni]. Also, it was found that particle size could be controlled by the kinds of surfactants
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1193.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of High Concentration Cuprous Oxide Nanoparticles by Modified Polyol Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1185-1188 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Cuprous oxide nanoparticles at high concentration (up to 0.3M) were successfullysynthesized by modified polyol process. The redispersion stability could be controlled by optimizingvarious conditions like polymer concentration, temperature, reductant, and catalyst. Reductant andcatalyst play a crucial rule in redispersion of cuprous nanoparticles. Under poor conditions, particlesgrow to larger sizes due to aggregation of nanoparticles. This modified polyol process allowsmonodispersed cuprous oxide to be obtained on gram scale in a single reaction and make possible ahigh synthetic yield of more than 80%
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1185.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Large-Scale Synthesis of Polymer-Stabilized Silver Nanoparticles (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1189-1192 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The synthesis and characterization of polymer-stabilized silver nanoparticles (Ag NPs) forwater-based silver inks are studied. In order to synthesize Ag NPs with spherical shape, theconventional polyol processes require an excess of poly(vinyl pyrrolidone) (PVP) (10 ~ 1000 timesthan AgNO3) and therefore result in low productivity per reactor volume. In this study, poly(acrylicacid) (PAA) with carboxylic acid group was used instead of PVP. Even at less molar ratio of PAA toAgNO3 (〈 2), the spherical Ag NPs with average size of 30 nm were successfully synthesized at 100gram-scale with high reaction yield of 90%. Furthermore, the Ag NPs were dispersed intoalcohol-based solvent and then patterned into metallic lines through inkjet printing technology
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1189.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Fabrication of Dense Nanostructured Silicon Carbide Ceramics through Two-Step Sintering (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), 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: SiC powder compacts were prepared with Al2O3, Y2O3, and CaO powders. By two-step sintering, fully dense nanostructured SiC ceramics with a grain sizes of ∼40 nm were obtained. The grain size–density trajectories are compared with those of conventional sintering processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03560.x
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  • 5
    Electronic Resource
    Electronic Resource
    Fabrication and Mechanical Properties of Silicon Carbide-Silicon Nitride Composites with Oxynitride Glass (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: A microstructure that consisted of uniformly distributed, elongated β-Si3N4 grains, equiaxed β-SiC grains, and an amorphous grain-boundary phase was developed by using β-SiC and alpha-Si3N4 powders. By hot pressing, elongated β-Si3N4 grains were grown via alpha right arrow β phase transformation and equiaxed β-SiC grains were formed because of inhibited grain growth. The strength and fracture toughness of SiC have been improved by adding Si3N4 particles, because of the reduced defect size and the enhanced bridging and crack deflection by the elongated β-Si3N4 grains. Typical flexural-strength and fracture-toughness values of SiC-35-wt%-Si3N4 composites were 1020 MPa and 5.1 MPam1/2, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01873.x
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  • 6
    Electronic Resource
    Electronic Resource
    Spark Plasma Sintering of LiTi2(PO4)3-Based Solid Electrolytes (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: Solid electrolytes, LiTi2(PO4)3 (LTP), Li1.3Al0.3Ti1.7(PO4)3 (LATP), and Li1.3Al0.3Ti1.7(PO4)2.9(VO4)0.1 (LATPV), were prepared by conventional sintering (CS) and spark plasma sintering (SPS) methods, and the Li+ ion conductivity of the sintered pellets was examined using an impedance analyzer. SPS remarkably improved the densification compared to CS and resulted in dense ceramics (95–97% of theoretical density) irrespective of the substituted ions. The highest conductivity of 2.6 × 10−4 S/cm was found for the LATPV specimen sintered by spark plasma at 1100°C. LATP and LATPV exhibited an order of magnitude higher ionic conductivity than LTP in the specimens of similar densities. The results demonstrated that the enhanced conductivity in substituted LTP is not due to the enhanced densification alone. The other possible explanations are discussed in terms of bottleneck size, lithium content, and grain boundary characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00246.x
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  • 7
    Electronic Resource
    Electronic Resource
    Spark Plasma Sintering (SPS) of NASICON Ceramics (2004)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 87 (2004), 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: Spark plasma sintering (SPS) method was used to obtain dense NASICON ceramics with a high-electrical conductivity, which was compared with conventional solid-state sintering. The fully dense NASICON was achieved at a relatively low-sintering temperature of 1100°C, whereas the apparent density of the specimen prepared by conventional sintering was 74% of the theoretical density. The highest conductivity of 1.8 × 10−3 Scm−1 at 25°C, which is comparable to the best value reported, was achieved using the SPS process. Considering the phase, density, and microstructure, it appears that there is more room for improved conductivity by controlling the amount of monoclinic zirconia and the resistive grain-boundary glass phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2004.00305.x
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  • 8
    Electronic Resource
    Electronic Resource
    Pressureless sintering of SiC-TiC composites with improved fracture toughness (2000)
    Springer
    Journal of materials science 35 (2000), S. 5569-5574 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Composites of SiC-TiC containing up to 45 wt% of dispersed TiC particles were pressureless sintered to ∼97% of theoretical density at temperatures between 1850°C and 1950°C with Al2O3 and Y2O3 additions. An in situ-toughened microstructure, consisted of uniformly distributed elongated α-SiC grains, matrixlike TiC grains, and yttrium aluminum garnet (YAG) as a grain boundary phase, was developed via pressureless sintering route in the composites sintered at ≥1900°C. The fracture toughness of SiC-30 wt% TiC composites sintered at 1900°C for 2 h was as high as 7.8 MPa·m1/2, owing to the bridging and crack deflection by the elongated α-SiC grains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004848828322
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  • 9
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    Materials, Vol. 12, Pages 1037: Photocatalytic and Pozzolanic Properties of Nano-SiO2/Al2O3-TiO2 Powder for Functional Mortar (2019)
    MDPI
    In: Materials
    Details
    Publication Date: 2019
    Description: The present study intended to find a way to use TiO2, one of the most widely used photocatalysts, as a construction material. To that end, nano-SiO2/Al2O3-TiO2 powder (NTCP) was synthesized by coating SiO2 and Al2O3 support materials with TiO2. The NTCP was anatase phase spherical particles, specific surface areas were 319 m2/g and 267 m2/g for the SiO2-TiO2 powder and Al2O3-TiO2 powder. UV absorption test results showed the developed NTCP had a light absorption peak at wavelengths of 380 nm or below, and its absorbance was much larger than that of commercial TiO2. The NTCP formed smaller pores on the surface than commercial TiO2. As a result, the flow of the mortar decreased as the adsorption strength increased and combined a large number of water molecules. In addition, the Pozzolanic reaction by SiO2 and Al2O3 used as support materials produced many calcium silicate hydrate (C-S-H) and calcium aluminate hydrate (C-A-H). This has shown an increased strength of mortar mixed with the NTCP by promoting a nucleation effect and reducing the filling effect and the number of harmful holes in the mortar.
    Electronic ISSN: 1996-1944
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by MDPI
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  • 10
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    Neuregulin1 displayed on motor axons regulates terminal Schwann cell-mediated synapse elimination at developing neuromuscular junctions (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-01-11
    Description: Synaptic connections in the nervous system are rearranged during development and in adulthood as a feature of growth, plasticity, aging, and disease. Glia are implicated as active participants in these changes. Here we investigated a signal that controls the participation of peripheral glia, the terminal Schwann cells (SCs), at the neuromuscular junction (NMJ) in mice. Transgenic manipulation of the levels of membrane-tethered neuregulin1 (NRG1-III), a potent activator of SCs normally presented on motor axons, alters the rate of loss of motor inputs at NMJs during developmental synapse elimination. In addition, NMJs of adult transgenic mice that expressed excess axonal NRG1-III exhibited continued remodeling, in contrast to the more stable morphologies of controls. In fact, synaptic SCs of these adult mice with NRG1-III overexpression exhibited behaviors evident in wild type neonates during synapse elimination, including an affinity for the postsynaptic myofiber surface and phagocytosis of nerve terminals. Given that levels of NRG1-III expression normally peak during the period of synapse elimination, our findings identify axon-tethered NRG1 as a molecular determinant for SC-driven neuromuscular synaptic plasticity.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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