Materials Literature
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The viscosity and electrical conductivity of aqueous solutions of trehalose and other saccharides containing 1:1 electrolytes have been measured. The decrease in the molar conductivity of each of these electrolytes with increasing viscosity is less than that predicted by Walden's rule. Instead, the empirical relation…
The photophysical properties of Mo 3+ -doped chloro- and bromo-elpasolites at 10 K and as a function of temperature are presented. Visible upconverted luminescence is observed with near-infrared laser excitation, and the properties of this two-photon excitation process are experimentally characterized by a variety of…
In this paper, we report observations on single internally mixed ammonium sulfate/calcium carbonate microparticles. Deliquescence and efflorescence relative humidities for this mixed system are reported. The slightly soluble CaCO 3 has a negligible effect on the deliquescence relative humidity and the concentration-de…
The highly ordered mesoporous material H I SiO 2 was prepared at room temperature and low pH utilizing a high concentration of nonionic surfactant to achieve a hexagonal ordered phase with a pore size of ∼3.5 nm. The grafted amino ligand was covalently bonded to the internal pore surface of H I SiO 2 through a silanat…
Several workers have established that the Larkin domains for two three dimensional nonmetallic elastic solids in contact with each other at a disordered interface are enormously large. This implies that there should be negligible static friction per unit area in the macroscopic solid limit. The present work argues tha…
An upper bound to the roughening temperature of a close-packed singular surface, fcc Al (111), is obtained via free energy calculations based on thermodynamic integration using the embedded-atom interaction model. Roughening of Al (111) is predicted to occur at around 890 K, well below bulk melting (933 K), and it sho…
Numerical calculations of the temperature dependence of the longitudinal (T1-1) and transverse (T2-1) nuclear spin-relaxation rates for Fe, Co and Ni are performed for both ferromagnetic and paramagnetic states, using the first-principles density of states and various approximations of the spin-fluctuation theory. If…
Raman experiments were performed on Rb 2 WO 4 crystals, between room temperature and 850 K, including the high-temperature incommensurate phase. The experimental results observed in the incommensurate ( T I = 746 K) and the lock-in ( T C = 660 K) phase transitions can be explained by an order-disorder apex model, wher…
Intramolecular photoinduced electron transfer (ET) with rates greater than 2 × 10 9 s - 1 has been observed in polar solvents for the U-shaped, syn,syn isomer ( syn,syn - 4 ) of a giant tetrad with porphyrin and methyl viologen termini ( 4) . In contrast, no ET is observed in a sample containing the extended isomers a…
The properties of soft magnetic exchange-springs in both bilayer and multilayer samples are investigated, with particular emphasis on the discrete nature of the spring. It is shown that, in a mean-field model, a very simple relationship exists between the bending field B B , the exchange field B EX , and the number of…
A small amount of silicon incorporation into diamond-like carbon (DLC) films prepared by plasma-enhanced chemical vapour deposition (PECVD) onto Al 2 O 3 :TiC substrates was studied by a combination of surface analysis and nanomechanical measurement techniques, namely XPS, Raman spectroscopy, nanoindentation and nanos…
Improvements in the characterization of II-VI compound-based solar cells, and the recent experimental characterization of small clusters and nanoparticles, make the study of small II-VI clusters very interesting. In this work, the ground states of small ${\mathrm{Zn}}_{i}{\mathrm{O}}_{i}$ clusters are studied, where $…
A family of Mannich bases were prepared from the reaction of 2,2-bis-(4-hydroxyphenyl)propane (bisphenol A or BPA), formaldehyde, and poly(oxyalkylene)diamines at 1 : 1 : 1 or 1 : 2 : 2 molar ratio. By varying the molar ratio of bisphenol A to amine and the chemical structures of poly(oxyalkylene)diamines, a series of…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
The influence of temperature from 298 K to 353 K on the electrical conduction of low-density polyethylene is reported. Conduction current and differential scanning calorimetry (DSC) measurements show a correlation between the structural change due to the temperature treatment and the change in the activation energy of…
The effects of process conditions and molecular structure of polymer and diluent on the droplet size of membranes formed by thermally induced phase separatiom (TIPS) process were examined. The observed upper critical solution temperature–type phase boundaries of nylon-12 blended with poly(ethylene glycol) (PEG) and ny…
Shape memory thermoplastic polyurethanes (TPUs), based on amorphous soft segment from the reaction of hexamethylene diisocyanate and 1,2-butane diol, and the crystalline hard segment from 4,4′-methylenediphenyl diisocyanate and 1,6-hexanediol, were modified by hydrophilic segments, diol-terminated poly(ethylene oxide)…
Using the embedded-atom method, the structure of small copper clusters on Au(111) electrodes has been investigated both by static and dynamic calculations. By varying the size of roughly circular clusters, the edge energy per atom is obtained; it agrees quite well with estimates based on experimental results. Small th…
Crack-free antiferroelectric PbZrO3(PZ) thin films were prepared by a two-step annealing technique via a modified sol-gel process. Although x-ray diffraction results showed that single phase of perovskite PbZrO3 was obtained in the thin films annealed at 550, 700, and 550 °C/700 °C, double P-E hysteresis loop indicati…
Weit reichende Wechselwirkungen findet man bei einer neutralen, schichtartig aufgebauten Kupferverbindung, bei der die CuII-Ionen abwechselnd über End-on- und End-to-End-ständige Azide verbrückt sind (siehe Bild). Magnetische Messungen deuten auf ungewöhnliche ferromagnetische Wechselwirkungen zwischen den CuII-Ionen…