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N2 and CO2 Adsorption by TMA- and HDP-Montmorillonites
N2 and CO2 gases adsorption by tetramethylammonium(TMA)-montmorillonites and hexadecylpyridinium(HDP)-montmorillonites was carried out using volumetric equipment at 25 °C and 0.1 MPa. The addition of organic compounds to montmorillonites was 1 and 4 times the cation exchange capacity (CEC) of the montmorillonites and…
Mode I and Mode II Interlaminar Fracture Behavior of Glass Woven Fabric Composites
Evaluation of Adherence and Performance of Epoxyphenolic Coatings on Electrolytic Tinplates
Article Evaluation of Adherence and Performance of Epoxyphenolic Coatings on Electrolytic Tinplates was published on October 1, 2002 in the journal Science and Engineering of Composite Materials (volume 10, issue 5).
Homogeneous Gaussian Profile P+-Type Emitters: Updated Parameters and Metal-Grid Optimization
P+-type emitters were optimized keeping the base parameters constant. Updated internal parameters were considered. The surface recombination velocity was considered variable with the surface doping level. Passivated homogeneous emitters were found to have low emitter recombination density and high collection efficienc…
Calibration of a Commercial Kneader for Rheological Applications
In the case of some highly viscous fluids, or thick pastes (such as those exhibiting high yield stress and/or high plastic viscosity), neither rotational nor tube type viscometers are suitable for rheological characterisation. Due to their capacity for generating and maintaining high torque or high rates of rotation,…
Thermal Expansion and Oxidation of 3D C/SiC Composites with Different Coatings from Room Temperature to 1400°C
Article Thermal Expansion and Oxidation of 3D C/SiC Composites with Different Coatings from Room Temperature to 1400°C was published on October 1, 2002 in the journal Science and Engineering of Composite Materials (volume 10, issue 5).
Thermodynamic Evaluation of Carbide Precipitates in 2.25Cr¾ 1.0Mo Steel for Determination of Service Degradation
The 2.25Cr¾1.0Mo steel is widely used in petroleum refining units, for example, in pressure vessels, working under severe operational conditions. Due to the high temperatures of some processes, many phenomena such as precipitation of carbides and their coarsening occur during service, resulting in changes of material…
Numerical Studies of the Effect of Constitutive Model Parameters as Reflecting Polymer Molecular Structure on Extrudate Swell
PolyFlow, a software package based on the finite element method was employed to simulate the extrudate swell for polybutadiene of various molecular weight (Mw) and molecular weight distribution (MWD). We calculated the relaxation spectra for the different samples and then inserted the spectra into a standard K-BKZ con…
The Rheology Handbook - For users of rotational and oscillatory rheometers
Woodflour as Reinforcement of Polypropylene
The effect of the filler content and size, as well as accelerated aging on the mechanical properties of polypropylene composites reinforced with woodflour (WF/PP) were evaluated. The composites were prepared by the extrusion of polypropylene with woodflour (Pinus elliotti) based on following ratios: 15, 25 and 40 wt%…
Effect of Surface Treatment and Testing Temperature on Mode I Interlaminar Fracture Behavior of Glass Woven Fabric Composites
Understanding Rheology
Linear Viscoelastic Behavior of Bentonite-Water Suspensions
Bentonite are extensively used materials in a wide range of applications. Creep and oscillatory shear experiments in the linear viscoelastic domain were carried out on bentonite-water suspensions at different solid fractions. It was found that bentonite dispersions exhibit important viscoelastic behavior which could b…
Synthesis of Titania-Silica Materials by Sol-Gel
In this work TiO2-SiO2 glasses containing as much as 20 mol % of TiO2 were prepared via sol-gel process using titanium and silicon alkoxides, in the presence of chlorine, in the form of titanium tetrachloride or HCl. The gels were heat-treated until 800 °C. X-ray diffraction and Fourier transform infrared spectroscopy…
Effect of the Addition of Potassium or Lithium on the Columbite Precursor Microstructure
Pechini method has been used to synthesize MN powders with stoichiometric control. By this method, K and Li-doped MN in the range from 0.1 to 5.0 mol% of dopants have been obtained at relatively lower temperatures than it is possible with the conventional mixture of oxides. The results from BET analysis indicated that…
Synthesis of Group IVB Metals Oxicarbides by Carboreduction Reactions
The metals of the group IV B (Ti, Zr, Hf) present a series of carbides and oxicarbides with scientific and technological interest. Many of these compounds belong to the subsystem "MO - MC" of the pseudoternary "MO - MN - MC" system (where M = Ti, Zr or Hf). In this work carboreduction reactions of TiO2 and ZrO2 were p…
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Repair of Concrete Elements Using CFRP: Parametrical Study and Evaluation of Dynamic Properties
On the Nature of Sandwiched Chromium Complexes in Exchanged alpha-Zirconium Phosphate
Layered alpha-zirconium hydrogenphosphate monohydrate was prepared by direct precipitation, exchanged with n-propylamine and then by chromium aquacomplexes. The solids were characterized by X-ray diffraction, mass spectrometry, infrared and UV-Visible spectroscopy. The results suggest that monomer complexes form exten…