Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTiming Is Critical: Effect of Spin Changes on the Diastereoselectivity in Mn(salen)-Catalyzed EpoxidationChristian Linde, Björn Åkermark, Per-Ola Norrby, and Mats SvenssonView Author Information Department of Chemistry, Organic Chemistry Royal Institute of Technology S…
We have studied phase separation in off-critical mixtures of poly(ethylene propylene) (hPEP) and perdeuterated poly(ethylene propylene) (dPEP) inside the metastable and unstable region of the phase diagram but under the influence of a surface that attracts the majority component (dPEP). In the adjacent depletion regio…
The kinetics of charge transfer at an electrode modified with a submonolayer of CdS nanoparticles is considered using intensity modulated photoelectrochemical spectroscopy (IMPS). First, the method of preparing an electrochemically addressable layer of CdS nanoparticles is detailed. Then a model of charge transfer fro…
We study isothermal magnetization processes in the Cu-Al-Mn intermetallic alloy. Hysteresis is observed at temperatures below the spin-freezing of the system. The characteristics of the hysteresis cycles as a function of temperature and Mn content (magnetic element) are obtained. At low temperature (5 K) a change from…
We study magnetic domain walls in double exchange materials. The domain wall width is proportional to the square root of the stiffness. In the double exchange model the stiffness has two terms: the kinetic energy and the Hartree term. The kinetic energy term comes from the decrease of the tunneling amplitude in the do…
A theoretical model relating the kinetic, mechanistic, and thermodynamics aspects of a chemical reaction is presented. The model is based upon the consistency between the principle of maximum hardness and the Hammond postulate, and it is used to obtain insights about the reaction mechanisms and to define rate constant…
The structures of La 0.7 Ca 0.11 Sr 0.19 MnO 3, La 0.32 Pr 0.38 Sr 0.3 MnO 3, Pr 0.7 Sr 0.23 Ba 0.07 MnO 3, and Nd 0.7 Sr 0.16 Ba 0.14 MnO 3 have been refined from 4 K powder neutron diffraction data. These samples have all the same doping level and mean A cation size radius, but the A cation size variance σ 2 increas…
The effect of large-amplitude oscillatory shear flow on a concentrated block copolymer solution with lamellar order was studied by in-situ small-angle neutron scattering. Microstructural changes were studied as a function of temperature, frequency of the oscillatory flow field, and thermal history prior to turning on…
Solid−liquid equilibria of 14 binary systems containing various amides or sulfolane with organic compounds have been measured by a visual technique. The substances investigated are important and often used as selective solvents in the chemical industry, for example for extractive distillation or extraction. Assuming e…
Complex formation between a carboxyl-terminated cascade polymer (generation 3) and several cationic polyelectrolytes of varying linear charge density was studied as a function of ionic strength, by turbidimetric titration and dynamic light scattering. Tetramethylammonium chloride was used to adjust the ionic strength…
A three-dimensional polybead model of the structure and large strain deformation of amorphous polymeric networks is constructed and evolved via Monte Carlo techniques. The model has successfully simulated various deformation conditions and been found to qualitatively capture the proper state of deformation, rate of de…
Copper in the form of nanoparticles and microsized fibers was synthesized by using carbon nanotubes as a template. The size of the copper nanoparticles was controllable in the range between a few and tens of nanometers, depending on the diameter of carbon nanotubes and the preparation conditions. They could be detache…
A new way for preparation of microporous silica containing metal nanoparticles inside pores is described. Special amphiphilic block copolymers, polybutadiene-b-poly(ethylene oxides), are used in a first step as nanoreactors for the preparation of metal nanoparticles inside their micelle cores and then as templates whe…
Huge built-in electric fields have been predicted to exist in wurtzite III-V nitrides thin films and multilayers. Such fields originate from heterointerface discontinuities of the macroscopic bulk polarization of the nitrides. Here we discuss the background theory, the role of spontaneous polarization in this context,…
The solvation of Al and its hydrolyzed species in water clusters has been studied by means of ab initio molecular dynamics simulations. The hexa-hydrate aluminum ion formed a stable complex in the finite temperature cluster simulation of one aluminum ion and 16 waters. The average dipole moment of strongly polarized h…
An introduction to the Propp-Wilson method of coupling-from-the-past for the Ising model is presented. It enables one to obtain exact samples from the equilibrium spin distribution for ferromagnetic interactions. Both uniform and random quenched magnetic fields are included. The time to couple from the past and its st…
Mesoporous silica SBA-15 molecular sieve has been synthesized and incorporated with aluminum via three different postsynthesis procedures by reacting SBA-15 with AlCl 3 in dry ethanol (route 1), with aluminum isopropoxide in dry hexane (route 2) and with an aqueous solution of sodium aluminate (route 3) followed by ca…
Using a novel thin film polymerization technique, we have observed the phase separation, coalescence, and annihilation of liquid crystal textures during polymerization of wholly aromatic main-chain liquid crystalline polymer poly( p -oxybenzoate/2,6-oxynaphthoate) (P(OBA/ONA)). The polycondensation reaction was conduc…
A calcium carbonate (CaCO 3 ) sorbent synthesized in the presence of surface modifiers has recently been developed in this laboratory for the purpose of enhancing the reactivity toward SO 2 at high temperatures (800−1150 °C). The calcium carbonate particles are produced by precipitation from an aqueous suspension of c…
A new class of metal sandwich complexes of silver derived from silver(I) perchlorate and fluoranthene (L 1 ), benzo[ ghi ]perylene (L 2 ), [2,2]paracyclophane (L 3 ), and decacyclene (L 4 ) was prepared. The idea behind the use of polycyclic aromatic compounds as an alternative approach for construction of organometal…