Materials Literature
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The crystal and molecular structure of a new ferroelectric [C 5 H 6 N] + ReO 4 - was determined by the x-ray diffraction method at 350 K, 293 K and 220 K. In all three phases its structure is orthorhombic, with the following sequence of space groups: Cmcm Cmc 2 1 Pbca . In the two high-temperature phases, the pyridini…
The structural parameters of nanoscale silver particles embedded in a silicate glass matrix have been determined by temperature-dependent EXAFS spectroscopy at the Ag K edge for two particle sizes of 2.5 and 6 nm. EXAFS measurements allowed us to probe both the oxygen environment of silver ions separated within the gl…
Measurements by x-ray diffraction, secondary ion mass spectrometry and atomic force microscopy are reported for single crystalline KTaO 3 after thermal treatment under oxidizing conditions in the temperature range of 700 to 1100 °C. The formation of a series of new phases KO*(KTaO 3 ) n of Ruddlesden-Popper type is ob…
Aromatic polyamides represent an important class of polymeric materials from both the academic and the industrial points of view. Unfortunately, because of strong intermolecular interactions mainly due to hydrogen bonding, their solubility in common organic solvents is often extremely poor. In most cases, this drawbac…
Thin films of symmetric diblock copolymers confined between two hard, flat and parallel surfaces have been investigated by means of Monte Carlo simulations on a simple cubic lattice. The upper surface is homogeneous, either neutral or preferential to one of the two blocks, and the lower surface is stripe-patterned, wi…
The influence of the cations on bond length, valence, and torsion angle of S4(2-) and S5(2-) anions was examined in a series of solid alkali tetra- and pentasulfides by relating their Raman spectra to their known X-ray structures through a force-field analysis. The IR and Raman spectra of BaS4.H2O and the Raman spectr…
Many petroleum companies have been using a tool developed by MPC for evaluating materials operating in the creep range. This method has now been recognized for inclusion in API RP579 on fitness-for-service. This paper reports on the method and explains the materials properties used therein. The MPC Omega method concen…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPolyimides Derived from Novel Unsymmetric DianhydrideHai Bin Zheng and Zhi Yuan WangView Author Information Department of Chemistry, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada K1S 5B6 Cite this: Macromolecul…
We show that in strong (quantizing) magnetic fields "ordinary" free magnetic polaron in diluted magnetic semiconductors (of type $A^2MeB^6$, where Me=Fe, Mn) exists in the form of vortex lattice quite similar to that in type II superconductors (Abricosov vortex lattice). The region of external parameters (like externa…
Molecular dynamics computer simulations which employ the embedded-atom potential show that nanowires of gold exist as multishelled structures. We simulate double-walled gold nanowires and calculate the capacitance of a finite nanometer-size cylindrical capacitor. For the sizes for which multishelled nanowires appear i…
Dipalmitoyldiphosphatidic acid (DPPA), dipalmitoyldiphosphatidylcholine (DPPC), and sphingosine were adsorbed onto polyelectrolyte coated colloids and capsules forming composite lipid−polyelectrolyte layers. The stepwise coating was performed either by adsorption of preformed vesicles onto the capsule surface or by a…
The heat capacity of crystalline poly(p-phenylenebenzobisoxazole) was measured below room temperature by adiabatic calorimetry. The standard thermodynamic functions (enthalpy, entropy, and Gibbs energy) were established and tabulated. The temperature dependence of the heat capacity was compared with those of polyethyl…
The fluorometric determination of the ground-state dissociation constant K d of a complex between ligand and titrant with 1: n stoichiometry in the presence and absence of excited-state association is discussed. This report extends the results of a previous study ( J. Phys. Chem. 1994, 98, 8585) where a 1:1 complex be…
The results of the complex study of samples of plasticized poly(vinyl chloride) (PVC) subjected to aging under model and climatic conditions or being in use for a long time (from 15 to 30 years at 253–301 K) studied by various techniques and the mechanism of their aging are presented in the article. Using the thermogr…
The chemical stability of 10% SF 6 -90% N 2 mixtures (100 kPa pressure) has been studied under sparking in the presence or absence of an organic insulator (teflon, kel'F, polyethylene, polypropylene, nylon, megelit), and/or added impurities (0.2% O 2 or H 2 O). The study was carried out experimentally and numerically.…
Nanoparticles of the diluted magnetic semiconductor Cd 0.991 Co 0.009 S, with diameters D between 3.5 and 29.5 nm, were studied by 113 Cd NMR spectroscopy. Two spectral features could be discerned: (1) a strong line corresponding to cadmium atoms that are removed more than four bonds from cobalt ions and (2) a set of…
A group contribution method is proposed to predict surface tension of liquid organic solvents. The proposed model is developed from a training set of 349 chemicals and validated with an external testing set of 44 chemicals. For the training set, the experimental surface tension values and the values fitted by this mod…
Recycled plastics, predominantly high-density polyethylene (PE), are being processed in the shape of dimension lumber and marketed as “plastic lumber.” One drawback to these products is their low creep resistance or high creep speed. The objective of this study was to examine the feasibility of reducing the creep spee…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTNew Kinetics of CaCO3 Nucleation and Microgravity EffectX. Y. Liu, K. Tsukamoto, and M. SoraiView Author Information Department of Physics, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, and Faculty of Science, Tohoku University, Aramaki Aoba, Sendai 9…
This volume presents the acomplishments of over 85 internationlly renowned scientists whose work was influenced by Professor Wasan's groundbreaking research on interfacial phenomena at The Illinois Institute of Technology, Chicago.