Materials Literature
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We show that Herring's formula for the phonon-drag thermopower ${S}^{g}$ is equivalent to the standard Cantrell-Butcher (CB) formula for a two-dimensional electron (or hole) gas. The CB approach provides a rigorous theoretical framework which is remarkably successful in explaining the measured ${S}^{g}$ in two-dimensi…
This work for the first time reports X-ray crystals of the two mononuclear mercury(II) porphyrin complexes, i.e., a four-coordinate complex Hg(p-CN)4tpp (1) and a five-coordinate complex Hg(N-Me-tpp)Cl (2). Compound 1 is distorted square planar, whereas compound 2 is trigonal bipyramidal distorted square-based pyramid…
The 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 ${\mathrm{Zn}}_{i}{X}_{i}$ clusters are studied, $X=\mathrm{S…
Abstract Random copolymerizations of L ‐lactide with ( R )‐, ( S )‐, or rac ‐1‐methyltrimethylene carbonate with bis(pentamethylcyclopentadienyl) samarium‐methyl tetrahydrofuranate [(C 5 Me 5 ) 2 SmMe(THF)] as a novel initiator provided high molecular weight polymers with low polydispersities. Biodegradation of the re…
We report x-ray scattering studies of broad peaks located at (0.5 0 0)/(0 0.5 0)-type wave vectors in the paramagnetic insulating phases of ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ and ${\mathrm{Pr}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}.$ We interpret the scattering in terms of correlated polar…
A new type of mesoporous mixed transition metal oxide of Nb and Ta (NbTa-TIT-1) has been prepared through a two-step calcination, which consists of single crystal particles with wormhole mesoporous structure.
Abstract The multimodal differential scanning calorimetry melting endotherms observed for commercial linear low‐density polyethylenes are due to broad and multimodal short‐chain‐branching distributions. Multiple peaks, observed in melting endotherms of isothermally melt‐crystallized and compositionally homogeneous pol…
Electron magnetic resonance measurements were employed for studying the magnetic spin structure in bulk and crushed crystalline samples of doped ${\mathrm{La}}_{0.888}{\mathrm{Na}}_{0.113}{\mathrm{Mn}}_{0.997}{\mathrm{O}}_{3}$ and ${\mathrm{La}}_{0.833}{\mathrm{Sn}}_{0.126}{\mathrm{Mn}}_{0.997}{\mathrm{O}}_{3},$ and s…
A series of novel triphenylenes has been synthesised by a combination of palladium catalysed coupling, oxidative cyclisation, bromination and nucleophilic aromatic substitution. The new derivatives are designed to have structures which are intermediate between the known symmetrical materials hexakis(hexyloxy)triphenyl…
The dynamics of decay of the photoproducts of the two non equivalent molecules of N-(n-propyl) nitrospiropyrane in the crystalline state is significantly different due to the effect of the specific site where each of the molecules is located in the crystal latice.
The photophysical properties of Ti(2+)-doped NaCl and MgCl(2) at 15 K are compared. At this temperature both materials emit luminescence from their respective lowest excited states and from the (3)T(1g)(t(2g)e(g)) higher excited state. In Ti(2+):MgCl(2) the ligand field is significantly stronger than in Ti(2+):NaCl, l…
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…
Abstract In this research, the preparation and characterization of polypropylene (PP) and natural zeolite composites were studied. Natural zeolite mined in Gördes, Turkey was used as an alternative filler to CaCO 3 . Films were prepared by the extrusion of PP, and surface‐modified zeolite was made by polyethylene glyc…
The use of a bis-bidentate ligand in a solid cobalt dioxolene complex affords the necessary cooperative properties that lead to thermal hysteresis in a valence tautomeric interconversion equilibrium.
[structure: see text]. New poly(phenylene ethynylene)s (PPEs) and poly(phenylene vinylene)s (PPVs) that are highly emissive in solution and thin films were prepared utilizing palladium-catalyzed cross-coupling between new 1,4-diiodo-2,3-dialkoxybenzene- and iptycene-containing monomers. The absorption and emission spe…
Using an ab initio local density approximation (LDA) method, we have studied the structural properties and the electronic band structures of several tin-based clathrate materials. We find that the pure type-I $({\mathrm{Sn}}_{46})$ and type-II $({\mathrm{Sn}}_{136})$ clathrate frameworks are metastable, expanded-volum…
The study objectives were to quantify the time- and magnitude-dependence of flow-induced alignment in vascular smooth muscle cells (SMC) and to identify pathways related to the orientation process. Using an intensity gradient method, we demonstrated that SMC aligned in the direction perpendicular to applied shear stre…
Several types of sugar-installed poly(ethylene glycol)/poly(DL-lactide) (sugar-PEG/PLA) block copolymers were synthesized. The synthesized block copolymer forms a core-shell type polymeric micelle in aqueous media possessing sugar molecules on its surface. Specific recognition of lectin proteins with the sugar molecul…
We report on the fabrication of field emission microcathodes which use carbon nanotubes as the field emission source. The devices incorporated an integrated gate electrode in order to achieve truly low-voltage field emission. A single-mask, self-aligned technique was used to pattern the gate, insulator and catalyst fo…
A quantum statistical theory of spin-dependent tunneling through asymmetric magnetic double barrier junctions is presented which describes $both$ ballistic and diffuse tunneling by a single analytical expression. It is evidenced that the key parameter for the transition between these two tunneling regimes is the elect…