Materials Literature
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Rings of 24 atoms form part of the two-dimensional structure of the novel compounds [NdM(bpym)(H2O)4(CN)6]⋅3 H2O (M = Fe (1), Co (2); bpym = 2,2′-bipyrimidine). These compounds are the first two-dimensional cyano-bridged species containing lanthanide and transition metal centers (see picture). The structures and magne…
Transport of redox-active probe ions through multilayers made from highly charged polyelectrolytes is described. Because of intrinsic charge balance between polyelectrolyte segment ion pairs, there are no sites for the exchange of small ions within the bulk of as-made multilayers. In the presence of salt in the extern…
Largely monodisperse, crystalline nanoscale oxide particles (for example, Cu2O, TiO2, Nb2O5) are preparatively accessible with the polyol method (see picture). The colloidal suspensions of the particles thus obtained can be employed readily for the homogeneous coating of various substrates (for example, glass plates,…
We report a nanoscale "lost-wax" method for forming colloids with size distributions around 5% and their corresponding colloidal crystals. Macroporous polymer templates are first prepared from a silica colloidal crystal. We then use the uniform and interconnected voids of the porous polymer to generate a wide variety…
Dc-magnetization, x-ray diffraction, and Raman-scattering studies in polycrystalline $({\mathrm{La}}_{1\ensuremath{-}y}{\mathrm{Nd}}_{y}{)}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ $(y=0.0,0.5,1.0,$ and $x=1/3)$ samples are presented. The samples with $y=0.5$ and 1.0 show complex magnetic states at low t…
Polyurethane networks bearing dendritic wedges of the second, third and fourth generation were prepared by polymerization of dendritic diols of the corresponding generation with a commercially available triisocyanate (Desmodur RFE). The formation of a three-dimensional network was greatly influenced by the shielding e…
We report the synthesis of a new series of cyclophanes 11a-d by ester-forming macrocyclization reactions of diol 9 with the dicarbonyl chloride derivatives of benzene, thiophene, ferrocene, and diphenyl ether, 10a-d, respectively. Compounds 11a-d display a two-electron, quasireversible oxidation wave in the cyclic vol…
The substitution of Ga(3+) into the Jahn--Teller distorted, antiferromagnetic perovskites LaMnO(3) and NdMnO(3) strongly affects both the crystal structures and resulting magnetic ordering. In both compounds the Ga(3+) and Mn(3+) cations are disordered over the six coordinate sites. La(2)GaMnO(6) is a ferromagnetic in…
A series of chlorinated aliphatic compounds (RCI, including carbon tetrachloride (PCM), 1,1,1-trichloroethane (TCA), 1,1,2,2-tetrachloroethane (TeCA), pentachloroethane (PCA), hexachloroethane (HCA), trichloroethene (TCE), tetrachloroethene (PCE), trichloronitromethane (chloropicrin, CP), and trichloroacetonitrile (TC…
Substitution of Mn by Fe in ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{Mn}}_{1\ensuremath{-}y}{\mathrm{Fe}}_{y}{\mathrm{O}}_{3}$ induces a gradual transition from a metallic ferromagnet with a high Curie temperature ${(T}_{c}\ensuremath{\sim}370 \mathrm{K})$ for $y=0,$ to a ferromagnetic insulator with low ${T}_{…
Crystallization of a series of liquid crystalline copolyesters prepared from p-hydroxybenzoic acid (HBA), hydroquinone (HQ), terephthalic acid (TA), and poly(ethylene terephthalate) (PET) was investigated by using differential scanning calorimetry (DSC). It was found that these copolyesters are more crystalline than c…
Epitaxial thin films of copper(I) oxide ( Pn 3 m, a = 0.427 nm) were electrodeposited onto [110]-, [111]-, and [100]-oriented single-crystal copper ( Fm 3 m, a = 0.3615 nm) by reduction of copper(II) lactate in solution. Cu 2 O films grown on Cu(110) and Cu(111) exhibited both an out-of- and in-plane orientation follo…
Pt and Pd particles supported on a texturally stable Ce 0.68 Zr 0.32 O 2 mixed oxide were investigated by means of H 2 chemisorption and high-resolution transmission electron microscopy (HRTEM). The comparison of the metal dispersion data as determined by HRTEM with those estimated from H 2 volumetric adsorption revea…
We describe a compensated common path lateral shearing interferometer that allows fast two-dimensional measurements of the optical thickness of transparent plates. The bench is able to provide accurate results even when heterogeneous residual birefringence is present in the sample. This bench brings several improvemen…
The effect of several surface active additives (called for brevity “foam boosters”) on the foaming properties of solutions of the anionic surfactant sodium dodecyl polyoxyethylene-3 sulfate (SDP3S) is studied in the presence of silicone oil. As foam boosters we study lauryl amide propyl betaine (LAPB), lauryl acid die…
We study in a Landau-de Gennes approach the biaxial structure of a nematic point defect with topological charge M = + 1. We aim to illuminate the role of the confining boundaries in determining the fine structure of the defect. We show that there are different regimes associated with different values of the ratio betw…
A shift in plasmon surface resonance is measured for colloidal solutions of gold nanoparticles upon adsorption of polyampholyte (gelatin). It is demonstrated that the shift in wavelength of the absorption maximum can quantitatively yield measurements of the adsorbed amount as well as information about the structure of…
Non-equilibrium dynamics in an interacting Fe-C nanoparticle sample, exhibiting a low temperature spin glass like phase, has been studied by low frequency ac-susceptibility and magnetic relaxation experiments. The non-equilibrium behavior shows characteristic spin glass features, but some qualitative differences exist…
Monte Carlo simulations of a model for $γ$-Fe$_2$O$_3$ (maghemite) single particle of spherical shape are presented aiming at the elucidation the specific role played by the finite size and the surface on the anomalous magnetic behaviour observed in small particle systems at low temperature. The influence of the finit…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTemplate Synthesis of Asymmetrically Mesostructured Platinum NetworksHyun June Shin, Ryong Ryoo, Zheng Liu, and Osamu TerasakiView Author Information Materials Chemistry Laboratory, Department of Chemistry School of Molecular Science-BK21 Korea Advanced Institute of Sc…