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  • 1
    Electronic Resource
    Electronic Resource
    Toughening of Polypropylene-Ethylene Copolymer with Nanosized CaCO〈sub〉3〈/sub〉 and Styrene-Butadiene-Styrene (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1451-1454 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Nanocomposites of nanosized-CaCO3/polypropylene-ethylene copolymer (PPE) and nanosizedCaCO3/ PPE/ styrene-butadiene-styrene (SBS) were prepared by using two-roll mill and singlescrew extruder. The average particle size of nanosized CaCO3 was determined to be about 30 nm.By adding nanosized CaCO3 into PPE matrix, the toughness of the matrix improves significantly. Atnanosized CaCO3 content of 12 phr (parts per hundred PPE resin by weight), the impact strength ofCaCO3/PPE at room temperature reaches 61.6 KJ/m2, which is 3.02 times that of unfilled PPEmatrix. In addition, the synergistic toughening effect of nanosized CaCO3 and SBS particles on PPEmatrix was investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1451.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Study on the Micro Structure and Mechanical Properties of Nano-CaCO〈sub〉3〈/sub〉/ABS Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1459-1462 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The nano-CaCO3/Acrylonitrile-Butadiene-Styrene (ABS) composites were prepared bymelting-blend with the single-screw extruder. The mechanical properties of the nanocomposites andthe dispersion of nano-CaCO3 were investigated by means of transmission electron microscopy(TEM) and mechanical tests. The micro structure of the fracture section of the nanocomposites wasanalyzed by means of scanning electron microscopy (SEM). The results show that not only theimpact property but also the rigidity property and the bending modulus of the system have beenincreased evidently by added modificated nano-CaCO3. However, the tensile strength of thenano-composites has a little decreased by added the modificated nano- CaCO3. The modificatednano-CaCO3 has been dispersed well in the matrix in the nanometer scale. The micro structure ofthe fracture section of the nanocomposites proved that when the composites have been impacted,the modificated nano-CaCO3 particles have taken an action of initiating and terminating crazing(silver streak), which can absorb more impact energy than the pure ABS resin. Compared with thepure ABS resin material, the notched impact strength of the nano-CaCO3/ABS composites added 2percent hundred resin (PHR) modificated nano-CaCO3 reach 36.77 kJ/m2, which have beenincreased up to 44%. At the same time, the rigidity of the nanocomposites has also been enhancedby 23.5% which is increased from 28.16N to 34.87 N
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1459.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Sintering Behavior of Pure and Nb-Doped BaTiO〈sub〉3〈/sub〉 Powder Prepared by High-Gravity Reactive Precipitation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2293-2295 
    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: Sintering behavior of pure and Nb-doped barium titanate powders prepared by high-gravityreactive precipitation (HGRP) process was investigated. A thermal dilatometer was employed to monitorthe sintering shrinkage continuously during sintering. TEM and SEM were used to characterize the microstructuresof the samples. The experimental results confirmed that Nb-doped BaTiO3 ceramics sintered at1220°C for 2 h reached a larger densification of 97.0% relative density compared with 94.6% of pureBaTiO3 ceramics sintered at 1265°C for 2 h, and Nb-doped BaTiO3 ceramics had a smaller grain size(1.2μm) than that of pure BaTiO3 ceramics (2μm)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2293.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Hydrothermal Synthesis and Structure Characterization of Nanocrystalline Barium Titanate Powders (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 23-26 
    Details
    ISSN: 1662-8985
    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: Nano-sized barium titanate powders were prepared by the high-gravity reactiveprecipitation (HGRP)-hydrothermal method. The properties and defects of hydrothermal bariumtitanate crystallites were investigated by TEM, XRD and FTIR. The mean particle size of thehydrothermal barium titanate was about 70 nm with narrow particle size distribution. The crystallitephases and OH defects were focused. The results show that the powders without heat treatmentwere crystallized as cubic-BaTiO3 and the absence of tetragonal with increasing calcinedtemperature to 1100°C. The IR results exhibited the OH defect content in the crystallites was toincrease the heat treatment temperature and reduced the probability of forming barium vacancies
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.23.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and Characterization of Hollow Silica via PMMA as Template (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 551-554 
    Details
    ISSN: 1662-8985
    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: Submicrosized porous hollow silica spheres with a diameter of 350 nm and a shellthickness of approximately 10 nm were synthesized by a hydrothermal method using PMMAhollow particles as template. Through the hydrolysis of TEOS, a continuous and uniform coating ofSiO2 was deposited over the surface of PMMA cores to form the core-shell structures. Aftercalcining to remove the template, a pure hollow silica structure with holes in the shells wasobtained. The as-prepared hollow products were characterized with TEM, SEM, EDS, BET andFT-IR. Its large surface area and hollow morphology will make this new material a promising agentfor the applications of catalysts, controlled drug delivery and etc
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.551.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Dispersibility and Charge Property of Different Surface Modified Titanium Dioxide as Electrophoretic Particles (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 563-566 
    Details
    ISSN: 1662-8985
    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: To prepare stable electrophoretic ink (E Ink) contains titanium dioxide particles, oilsoluble red, dispersant and tetrachloroethylene (TCE), the modification of organic and inorganicmaterial onto the particle surface was investigated. Modified particles were characterized bymeasurement of X-ray photoelectron spectroscopy (XPS) and Fourier transform infraredspectroscopy (FT-IR) to confirm the composites and structures. The electrophoretic properties ofsample in TCE were investigated by static sedimentation experiment and electrophoresis instrument.The type of inorganic and organic materials used for the surface modification influencedispersibility and charge property of particles. On the whole, organic modified particles especiallymodified by anionic surfactant show better properties. The process conditions were investigated indetail using SDBS as the modifier. The dispersibility and charge property have significantlyimproved in optimized modifying condition that the proportion of surfactant is 15%, pH is 6 andreaction time is 1 hour which means SDBS modified TiO2 is suitable for electrophoretic particles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.563.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation of Nanocrystalline Copper Powders by Aqueous Reduction (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 575-578 
    Details
    ISSN: 1662-8985
    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 aims at a simple preparation method of nanocrystalline copper powdersthrough copper sulfate reduction by potassium borohydride in aqueous solution. The productpowders obtained in various conditions were investigated by X-ray powder diffraction, transmissionelectron microscope and particle size distribution analyzer. The parameters that influence thepreparation process of copper crystalline were researched, such as the effect of complexing agent,the molar ratio of copper sulfate to potassium borohydride and the quantity of protective polymer.Finally, the preferable reaction conditions were determined, and well-dispersed nanocrystallinecopper powders with average diameter of 28.4nm were obtained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.575.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of Ca〈sub〉0.8〈/sub〉Sr〈sub〉0.2〈/sub〉ZrO〈sub〉3〈/sub〉 Powders Prepared by Soft Chemical Route (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 968-970 
    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: Precursors of calcium strontium zirconate (Ca0.8Sr0.2ZrO3) were synthesized by oxalate coprecipitationmethod. TG-DTA was used to characterize the thermal decomposition behaviors of the precursors.The XRD results revealed that the powders crystallized as cubic Ca0.8Sr0.2ZrO3 with increasingheating temperature up to 1000ºC. Calcium strontium zirconate ceramics were obtained under conventionalsintering conditions by using the as-prepared Ca0.8Sr0.2ZrO3 powders. The SEM micrographs of theceramics sintered at 1450oC exhibited narrow grain-size distribution with the average grain size around0.7 4m. The dielectric properties showed that, dielectric constant of the Ca0.8Sr0.2ZrO3 was about 24.0 anddielectric loss was 0.002 at the frequency of 1GHz and the room temperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.968.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Titania Nanotubes Prepared by Templating Needle-Like Calcium Carbonate (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 539-542 
    Details
    ISSN: 1662-8985
    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: Titania nanotubes were successfully synthesized by a simple procedure with needle-likeCaCO3 as inorganic templates at a room temperature in nonaqueous system. Through the hydrolysisof tetrabutoxytitanium (TBOT), titania crystal nucleus were deposited on the CaCO3 nanoparticlesdue to heterogeneous nucleation, followed by aggregation condensation on the surface ofneedle-like CaCO3 cores and removal of CaCO3 to produce hollow titania nanotubes. Itsmorphological and structural properties were characterized by TEM, SEM, and XRD, respectively.The nanotubes have a uniform tubular hollow structure with one or two big openings ends, thelength of about 2.0 μm, the average inner diameters of 100-200 nm, respectively, and a wallthickness of approximately 40 nm. The phase formed was anatase after calcinations at 723 K for 2 hand nanotubes with hollow structure remained their original shapes, and the BET surface area ofas-synthesized titania nanotubes was 243.45 m2/g, and decreased to 144.76 m2/g after calcinations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.539.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Sintering Behavior and Mechanism of Pure BaTiO〈sub〉3〈/sub〉 Ceramic Prepared by High-Gravity Reactive Precipitation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 11-12 (Feb. 2006), p. 27-30 
    Details
    ISSN: 1662-8985
    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: Sintering behavior and mechanism of barium titanate powders prepared by high-gravityreactive precipitation (HGRP) process has been investigated by a dilatometer. The mean particlesize of barium titanate powders prepared by HGRP was about 80 nm. Pure BaTiO3 pellets weresintered at a constant heating rate of 2.0 K/min and the temperature of shrinkage-onset for pelletwas 1060°C. The maximal shrinkage was 165um and the maximum of shrinkage rate was 8.0 x 10-3/ min at 1170°C. The sintering mechanism for the initial stages of sintering was determined byisothermal dilatometric measurements and was found to be viscous flow
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.27.pdf
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