Materials Literature
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A thin magnetite film grown by molecular-beam epitaxy on MgO(100) was studied by nuclear resonant scattering (NRS) at grazing incidence geometry. We show that the NRS data yield more information about the shape of the directional spin distribution than M\"ossbauer spectroscopy, in which only the average angle with res…
Kochite, ideally Na 2 (Na,Ca) 4 Ca 4 (Mn,Ca) 2 Zr 2 Ti 2 (Si 2 O 7 ) 4 (O,F) 4 F 4 , is a new member of the rosenbuschite group from the alkaline complex of Werner Bjerge, East Greenland. It occurs in nepheline syenite as lath-shaped to acicular crystals in aggregates up to 0.3 × 1.0 mm. Associated minerals are nephel…
Single crystals of anhydrous uric acid ( UA ) and uric acid dihydrate ( UAD ) were grown from supersaturated aqueous solutions containing the fluorescent dye acriflavine neutral ( AN ), a two-component commercial mixture of proflavine ( P ), and its 10-methylated analogue acriflavine ( A ). During UA crystal growth at…
This paper describes a comparative study of polymers containing push−pull type azobenzene moieties in their main and/or side chains. The polymers were systematically designed and synthesized specifically for this work in order to investigate their photodeformation through the migration of polymer chains, which was ind…
Single crystal X-ray structure data have been obtained for wairakite (Wairakei, New Zealand), Ca 0.95 Na 0.06 [Al 1.96 Si 4.04 O 12 ]·2H 2 O, at temperatures of 20°C, 170°C, 210°C, 400°C, and 600°C. Heating of wairakite up to 200°C is accompanied by a significant increase in the unit cell volume. At 145°C, the initial…
Liquid crystalline copolyesters of high molecular weight were obtained by polycondensation of aromatic diols, diacyl dichlorides, oligolactides, and poly(ethylene glycol)s. Hydrophilicity of the copolyesters was controlled by the content of ethyleneoxy moieties as verified by contact angle measurements. Copolyesters w…
Amorphous boron nitride (BN) powder was prepared by mechanically milling hexagonal BN and used as a starting material for studying BN phase transformation behavior. Fabricated amorphous BN (aBN) powder was significantly reactive with humidity in the air. When it was kept under a dry nitrogen atmosphere without H 2 O o…
In order to find criteria for discrimination between surface color centers at terraces and steps, and bulk color centers, the characteristic losses of these centers have been investigated by electron energy loss spectroscopy on an epitaxial MgO film grown on a Ag (1,1,19) surface. This film contains a significantly hi…
The broadening of the exciton absorption peak in films composed of small, ∼2 nm diameter CdSe nanocrystals capped by 1-thioglycerol has been interpreted as evidence of interdot carrier coupling. This exciton broadening is seen here for 2.1 nm diameter CdSe nanocrystal arrays, and part of it is correlated with the loss…
The volume thermal expansion of powdered natural orthoenstatite [(Mg_(0.994)Fe_(0.002)Al_(0.004))2(Si_(0.996)Al_(0.004))_2O_6] has been measured to 1473 K using energy dispersive synchrotron X-ray diffraction. Over the temperature range examined, the data are consistent with a volume thermal expansion, α, that linearl…
A diffuse interface or “front” at the top of the suspension is investigated experimentally and numerically. The width of the front is found to grow linearly in time, mainly due to a polydispersity of particle size in the very dilute experiments, and due only to fluctuations in particle density in the simulations. Away…
The modification of a polymer surface is valuable in applications where specific chemical and physical properties must be presented to other contacting materials. The surface concentration and orientation of linear and branched fluorosurfactant additives and the corresponding surface properties were investigated in fl…
Macrocyclization of a bioactive peptide with a bifunctional near-infrared fluorescent optical probe gives a compound that retained the receptor binding affinity of the peptide and the photophysical properties of the optical probe. The robust nature of the new compound provides a structural framework for optimizing the…
Stranded solvents: The aminocarbene chromium complex shown forms fiberlike aggregates of several μm length by self-assembly through noncovalent interactions. These strands allow an efficient immobilization of organic solvents in the form of a gel. The carbohydrate head group may induce supramolecular chirality in the…
The use of two techniques, differential interferometry and quasi-elastic light scattering (QELS), allowed us to study solutions of chitosan varying in degree of acetylation (DA), degree of dissociation (alpha), and concentration (C(p)). With the first technique, we demonstrated the modification of the electric polariz…
The influence of the interstitial impurities B, C, N, O, and H on the interfacial cohesion and structure of grain boundaries in body-centered cubic transition metals is investigated by means of the local-density-functional theory (LDFT), using the mixed-basis pseudopotential approach. $\ensuremath{\Sigma}5$ (310) [001…
Abstract In this paper, we report an alternative simple method to shift the electroactivity of polyaniline (PANI) films to neutral pH conditions by forming multilayer assemblies with poly(anions) using the layer‐by‐layer (LBL) deposition method. A series of self‐assembled PANI multilayer films with poly(anions), such…
The local and average orbital moments <L> of transition-metal (TM) clusters are determined bridging the gap between atomic Hund's rules and solid-state quenching. A remarkable enhancement of <L> is revealed in agreement with recent measurements. In small Ni(N) (N< or =10), <L> represents (20-40)% of the total magnetiz…
Molecular dynamics simulations of polymer melts at flat and structured surfaces reveal that, for the former, slow dynamics and increased dynamic heterogeneity for an adsorbed polymer is due to densification of the polymer in a surface layer, while, for the latter, the energy topography of the surface plays the dominan…
Abstract We have synthesized semiconductor and metal nanoparticles (NPs) in the constrained geometry of polymer microgels. We used electrostatically driven attraction between the ionic groups of the microgels and the precursor cations in the bulk liquid medium to introduce the cations in the interior of the microgel.…