Materials Literature
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Field-induced phase transitions of antiferroelectric–ferroelectric nature have been investigated in the Pb0.98La0.02(Zr0.70Hf0.30)1−xTixO3 system. Samples of compositions 0.065⩽x⩽0.10, located in the vicinity of an antiferroelectric–ferroelectric phase boundary, were analyzed by x-ray diffraction, by dielectric, and b…
Single crystals of MnThTe3 (1) and MgThTe3 (2) grow as small black plates from the stoichiometric reaction of the elements, the former at 1,000 degrees C and the latter at 900 degrees C with the aid of a Sn flux. Both compounds crystallize in the space group Cmcm of the orthorhombic system with four formula units in c…
One of the most important problems associated with use of polyaniline as a cathode material in rechargeable lithium batteries is related to energy density degradation due to the predomination of anion participation in the charge compensation process. This work describes the synthesis of a self-doped polyaniline, poly-…
Enthalpy relaxation of epoxy–diamine thermosets of different crosslink lengths (CLL) has been studied by DSC. The epoxy resins based on diglycidyl ether of bisphenol A were cured with ethylenediamine (FEDA), and diamines of polyoxypropylene of 2.6 and 5.6 oxypropylene units, named FJ230 and FJ400, respectively. As was…
The redox processes of secondarily doped and the pre-heated primarily doped polyaniline (150oC, 6-12 h) were investigated by in-situ resonance Raman spectroscopy. Raman spectra of secondarily doped polymer is more dependent on potential than those observed in the pre-heated primarily doped polymer. These different beh…
Health and safety legislation has forced changes in the type of anticorrosive pigments used in paint formulations, mainly focused on their substitution with different phosphates. The zinc phosphate pigment used with different types of binders has provided contradictory experimental results. In this paper, waterborne a…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSurface Confined Ketyl Radicals via Samarium(II)-Grafted Mesoporous SilicasIris Nagl, Markus Widenmeyer, Stefan Grasser, Klaus Köhler, and Reiner AnwanderView Author Information Anorganisch-chemisches Institut Technische Universität München D-85747 Garching, Lichtenber…
Abstract The rheology, morphology and properties of the composite systems of LCP, Vectra A TM 950 and Nylon 66 were investigated. The viscocity ratio of LCP and matrix has strong influence on their morphology. For LCP blends, the viscosity ratio of LCP is a critical factor in determining the blend morphology. The opti…
The distribution of anionic groups in fibres, fines, the colloidal fraction, and the dissolved fraction of thermomechanical pulp (TMP) suspensions was determined. The influence of extraction, alkaline treatment, and peroxide bleaching of spruce TMP were also studied. Spruce TMP was extracted with hexane, treated with…
Underwater friction surfacing experiments were carried out in a waterbath to clarify the effect of the surrounding medium on the characteristics of the process and the deposit. A quench hardenable martensitic stainless steel with 1%C and 17%Cr was used as the coating material and low carbon structural steel as the sub…
β-Al 2 TiO 5 thin films were obtained by dip-coating silicon substrates in acid-catalyzed precursor sols of aluminum and titanium alkoxides with and without acetyl acetone as a chelating agent and subsequent firing at 700 °C. Nuclear magnetic resonance and mass spectra of the precursor sols demonstrated that synthesis…
The synthesis and liquid crystalline behaviour of the first and second generations of a dendrimeric structure based on poly(propyleneimine)(DAB-dendr(NH2)x) are reported. 4-(4-n-Alkoxybenzoyloxy)salicylaldehydes are used as mesogenic moieties attached at the peripheral amino groups of the dendrimers giving rise to den…
Different glasses in the system xPbF2: (1 — x)[PbO : TeO2] have been synthesized and investigated. The effects of increasing PbF2 contents on material properties such as glass transition temperature (Tg), thermal expansion coefficient (α), microhardness (Hv), and electrical conductivity (σ) are studied. Addition of Pb…
The surface of porous silica particles was modified with poly(acrylic acid) by reacting the carboxyl groups on poly(acrylic acid) with the amino groups of pregrafted aminopropyltriethoxysilane (APS). The chemical modifications by APS and polymer were characterized by infrared spectroscopy and the amount of APS and pol…
Heating of polystyrene beads containing pentane isomers as the blowing agent traditionally produces polystyrene foam. Undesirable emissions of the blowing agent and its high flammability are the complications of this process. A new process for the production of expandable polystyrene has been developed, using water as…
Foams have been used for several decades to decrease the mobility of drive gas or steam, thereby enhancing the reservoir sweep efficiency. More recently foams found application in near-wellbore production enhancement operations such as acid diversion for matrix stimulation, gas shut-off, water shut-off and hydraulic f…
The thermo-insulating properties of both perpendicular- and conventional cross-laid lofty nonwoven fabrics, four different types each in terms of fiber fineness, are investi gated using a new static method with a heat flux sensor. The relationship between the thermal conductivity and the material density of all the sa…
Nucleation and growth of stable and metastable crystalline phases are described in the framework of a single-order parameter Cahn–Hilliard theory. A piecewise parabolic free-energy order parameter relationship composed of three parabolas of positive curvature coefficient has been adopted. The analytical solution of th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis of a NdAlO3/Al2O3 Ceramic−Ceramic Composite by Single-Source Precursor CVD†Michael Veith, Sanjay Mathur, Nicolas Lecerf, Karsten Bartz, Manuela Heintz, and Volker HuchView Author Information Institute of Inorganic Chemistry, University of Saarland, D-66123 Sa…
The magnetoresistance (MR) of icosahedral Al-Pd-Re of nominal composition ${\mathrm{Al}}_{70.5}{\mathrm{Pd}}_{21}{\mathrm{Re}}_{8.5},$ and with resistance ratios R [=\ensuremath{\rho}(4 K)/\ensuremath{\rho}(295 K)] from 2 to 120, has been measured in the range 0.1--40 K in magnetic fields up to 12 T. Three regions of…