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  • Electronic Resource  (14)
  • 1
    Electronic Resource
    Electronic Resource
    Activity coefficients of single electrolytes in concentrated solutions derived from a quasi-lattice model (1995)
    Springer
    Journal of solution chemistry 24 (1995), S. 465-484 
    Details
    ISSN: 1572-8927
    Keywords: Activity coefficients ; concentrated electrolytes ; dielectric constant ; quasi-lattice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This paper describes a new model to calculate the mean activity coefficients of dissociated electrolytes in concentrated solutions. It is based on three assumptions: (i) a quasi-lattice arrangements of ions in solution; (ii) a contribution from ion-water interactions to the mean activity coefficients; (iii) a concentration dependence of the dielectric constant. The mean activity coefficients of thirteen strong electrolytes from moderately dilute solutions to saturated solutions are found to correlate well by this model. For dilute solutions, a limiting equation in which only ion-specific parameters are required is proposed. It is suggested that specific ionwater interactions might be the major source of the nonideality of strong electrolyte solutions at high concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01004478
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  • 2
    Electronic Resource
    Electronic Resource
    Study on the Gas Sensitivity of a CeO〈sub〉2〈/sub〉 Based Ceramic Sensing Element: Structure and Characteristic (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 305-310 
    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 sensitivity of CuO dispersed on fluorite-type oxide, namely CeO2 was studied in this work. Mixed oxide sample of nanostructured CuxCe1-xO2-y of various composition were generated by step chemical precipitation method. Distinct copper species were identified as a function of copper content by X-ray photoelectron spectroscopy, X-ray powder diffraction, the special surface areas, transmissionelectron microscopy, scanning electron microscopy analysis, and sensing properties to CO. It was found that only small amounts of copper are sufficient to promote the sensitivity of CeO2 by several orders of magnitude, which excessive amounts of copper (Cu/(Cu+Ce)〉0.12) are detrimental to the sensingproperties of nanocompositions. The possible causes for this behavior are also discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.305.pdf
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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Sintering and Dielectric Properties of Nano-BaTiO〈sub〉3〈/sub〉 Powder Synthesized by High-Gravity Reactive Precipitation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 53-56 
    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 dielectric properties and sintering activity of nano-BaTiO3 powders synthesized by HGRP method were investigated. The starting BaTiO3 powders were calcined at different temperatures from 700 to 900°C to improve their crystallinity and the mean particle size of BaTiO3 powders obtained increasedfrom 40nm to 80nm. After being formed by conventional dry pressing the green bodies were sintered at 1100°C and 1200°C for 2hr in air. The effects of both calcinating and sintering temperatures on the sinterability, dielectric property and microstructure of BaTiO3 ceramics were discussed. The experimental results showed that the BaTiO3 powders have high sintering activity and the highestdielectric constant of this material at room temperature may reach 2880
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.53.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Dielectric Properties of HGRP BaTiO〈sub〉3〈/sub〉 Based X7R Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 98-100 
    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, a sub-micron grained sized (〈500nm) ceramic (〉 92% of theoretical) has beenobtained using nano-sized BaTiO3 powders synthesized through a high-gravity reactive precipitation(HGRP) process. Permittivity of the prepared ceramic is greater than 2500. Also, low change ratio oftemperature in the range of −55°C~ 125°C[removed info] i.e.〈 ±15% renders the ceramic to meet the EIA X7Rcharacteristics. In the ceramic compositions, Dy2O3, BaCO3, CaCO3, MnCO3 and MgO were used asdopants. After being mixed and dry-pressed, the above mentioned compositions in reducingatmosphere (N2 and 5% H2) were sintered at 1210°C−1290°C for 2h, respectively. Experimentalresults show that HGRP BaTiO3 powders have good dielectric properties. The dielectric properties aswell as the microstructure of the ceramic are both sensitive to the change of sintering 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.336-338.98.pdf
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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    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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