Materials Literature
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The effect of the electric current on the charge-ordered state in ${\mathrm{La}}_{5∕8\ensuremath{-}y}{\mathrm{Pr}}_{y}{\mathrm{Ca}}_{3∕8}\mathrm{Mn}{\mathrm{O}}_{3}$ $(y=0.35)$ manganite is investigated by means of in situ measurements of the temperature dependence of internal friction ${Q}^{\ensuremath{-}1}(T)$, Youn…
Atomistic simulations are performed to investigate the mechanical properties of uniaxial tensile and bending behaviours of double-walled carbon nanotubes. The second-generation reactive empirical bond-order potential and four different van der Waals (vdW) potentials are used to describe bonding and non-bonding atomic…
In contrast to classic ZTE materials (ZTE=zero thermal expansion), the ZTE effect in YbGaGe (see crystal structure) is caused by the change in the valency of the ytterbium ion from +2.6 to +2 with decreasing temperature. This change in the valence state compensates for the contraction of the net as the temperature dec…
Atom-transfer radical polymerization (ATRP) of acrylates from the initiator-modified zinc phthalocyanine yielded amphiphilic, phthalocyanine-terminated polymers with a narrow molecular-weight distribution. The disklike phthalocyanine moiety was incorporated into one end of the polymer chain. We investigated the aggreg…
A subject of great practical importance that has not received much attention is the question of the sensitivity of molecular dynamics simulations to the initial X-ray structure used to set up the calculation. We have found two cases in which seemingly similar structures lead to quite different results, and in this art…
5,10-Diphenyl-15,20-di(4-methoxyphenyl)-21-telluraporphyrin ( 7 ) was prepared in 18% yield by the p -toluenesulfonic acid-catalyzed condensation of 2,5-bis(1-phenyl-1-hydroxymethyl)tellurophene ( 6 ), pyrrole, and 4-methoxybenzaldehyde in carefully deoxygenated CHCl 3 followed by oxidation with p -chloranil. While 1…
Gold nanoparticles offer tremendous potential in the areas of nanoelectronics, bio- and chemosensors, and catalysis. However, before these applications are realized, the surface functionality of nanoparticles must be better controlled. Our lab has recently reported a novel synthetic approach for making monofunctionali…
A tricontinuous (10,3)c network phase is documented in a poly(cyclohexylethylene-b-ethylethylene-b-ethylene) triblock copolymer melt based on small-angle x-ray scattering. Application of shear transforms the self-assembled soft material into a single crystal (10,3)d network while preserving the short-range threefold c…
Natural systems excel in directing the synthesis of inorganic materials for various functional purposes. One of the best-studied systems is silica synthesis, as occurs in diatoms and marine sponges. Various biological and synthetic polymers have been shown to template and catalyze silica formation from silicic acid pr…
The hexagonal-channeled layer phase (ChLhex; see picture, right) is one of the new liquid-crystalline phases formed by the self-organization of the rigid rodlike alkali-metal carboxylates shown.
We have prepared polycrystalline samples of Yb-Nb-S-based misfit-layered compound and measured their thermoelectric properties below 300 K. The compound consists of an alternate stacking of a trigonal prism (MoS 2 )-type [NbS 2 ] layer and a two-layered rock-salt-type [Yb 1.90 S 2 ] slab, being incommensurate parallel…
To have a clear insight into the diamond nucleation upon the hydrothermal synthesis and the reduction of carbide (HSRC), we performed the thermodynamic approach on the nanoscale to elucidate the diamond nucleation taking place in HSRC supercritical-fluid systems taking into account the capillary effect of the nanosize…
Two unusual chainlike potassium borates of K 4 B 10 O 15 (OH) 4 ( 1 ) and KB 5 O 7 (OH) 2 ·H 2 O ( 2 ) have been synthesized under mild solvothermal conditions at 170 °C. The structures were determined by single-crystal X-ray diffraction and further characterized by FTIR, powder X-ray diffraction, and thermogravimetri…
Luminescent lanthanide complexes consisting of a lanthanide-binding chelate and organic-based antenna molecule have unusual emission properties, including millisecond excited state lifetimes and sharply spiked spectra, compared to standard organic fluorophores. We have previously used carbostyril (cs124, 7-amino-4-met…
Transport, magnetic, and thermal properties of phase-separated ${\mathrm{La}}_{0.8}{\mathrm{Ca}}_{0.2}\mathrm{Mn}{\mathrm{O}}_{3}$ crystal were studied in a wide temperature range down to $10\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. At low temperatures below the Curie point ${T}_{C}=184\phantom{\rule{0.3em}{0ex}}\mathrm…
Nine dinuclear copper(II) complexes with hxta5- ligands [H5hxta = N,N'-(2-hydroxy-1,3-xylylene)-bis-(N-carboxymethylglycine)]: [Cu2(MeO-hxtaH)(H2O)2] x 4H2O (1), [Na(micro-H2O)2(H2O)6][Cu2(Cl-hxta)(H2O)3]2 x 6H2O (2), [Cu(H2O)6][Cu2(Me-hxta)(H2O)2](NO3) x 2H2O (3), [Cu2(R-hxtaH)(H2O)3] x 3H2O [R = Cl (4), CH3 (5), and…
Structures of carbon nanotube/ligand complexes were studied by flow linear dichroism (the differential absorption of light polarized parallel and perpendicular to the flow orientation direction) with the aim of establishing linear dichroism as a technique to study such systems. Anthracene, naphthalene, and DNA were ch…
Two fluoride-encapsulated octasilsesquioxane cage compounds have been prepared using the TBAF route as important molecular models for studying ion entrapment in siliceous zeolites. Analyses by X-ray crystal structure and solution 19 F/ 29 Si NMR spectroscopy reveal very similar environments for the encapsulated fluori…
Age concern: Alkyl amine templates act as bifunctional surfactants which can template mesostructures with microporous walls. Ordered two-dimensional hexagonal mesoporous iron oxide with P6mm symmetry and three-dimensional cubic mesoporous iron oxide with Fm3m symmetry (see TEM image) have been prepared by using decyla…
We present in this paper a solid-state sample of microwave metamaterial produced by a standard hot-press technique for the manufacture of printed circuit boards. We performed three experiments to demonstrate that this sample is a left-handed material with negative refractive index. The three experiments are power tran…