Materials Literature
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We have investigated possible spin and charge ordered states in $3d$ transition-metal oxides with small or negative charge-transfer energy, which can be regarded as self-doped Mott insulators, using Hartree-Fock calculations on $d\ensuremath{-}p$-type lattice models. It was found that an antiferromagnetic state with c…
The structural transformation of high pH Na-rich buserite (NaBu) to H-exchanged hexagonal birnessite (HBi) at low pH was studied by simulation of experimental X-ray diffraction patterns. Four HBi samples were prepared by equilibration of NaBu at constant pH in the range pH 5-2. The samples differ from each other by th…
This paper surveys circuit innovations in ferroelectric memories at three circuit levels: memory cell, sensing and architecture. A ferroelectric memory cell consists of at least one ferroelectric capacitor, where binary data are stored, and one or two transistors that either allow access to the capacitor or amplify it…
We investigate a general scenario for "glassy" or "jammed" systems driven by an external, nonconservative force, analogous to a shear force in a fluid. In this scenario, the drive results in the suppression of the usual aging process, and the correlation and response functions become time translation invariant. The re…
Tip-induced nanoelectrochemical oxidation is used to pattern methyl-terminated silane monolayers on silicon via oxidation of their top CH3 groups in the process known as constructive nanolithography. These authors report the utility of such “inert” monolayers as extremely versatile templates for constructing a rich va…
The general approach involving the organization of polymers into micellar assemblies followed by stabilization through covalent intramicellar crosslinking of the assemblies has emerged as a powerful method for the production of well-defined nanostructured materials, having an amphiphilic core-shell morphology. When th…
Poly(L-lactic acid) (PLLA) was produced by the melt polycondensation of L-lactic acid. For the optimization of the reaction conditions, various catalyst systems were examined at different temperature and reaction times. It was discovered that Sn(II) catalysts activated by various proton acids can produce high molecula…
The structure and magnetic behavior of nanostructured powders of stoichiometric NiZn ferrite, Ni0.5Zn0.5Fe2O4, synthesized by coprecipitation, are investigated by extended x-ray-absorption fine structure spectroscopy (EXAFS), x-ray diffraction, Mössbauer spectroscopy, and vibrating sample magnetometry. Samples of high…
Nanocrystals of MgO (4 nm) exist as polyhedral structures with high surface concentrations of edge/corner sites. In powder form the crystallites weakly agglomerate into porous weblike structures of approximately 1400 nm according to small-angle X-ray scattering. Upon consolidation of these fine powders under pressure,…
Recently, a method to produce bulk quantities of pure multiwall WS 2 nanotubes, which could reach several microns in length, has been developed. A detailed study of the growth mechanism of these WS 2 nanotubes has been undertaken, which is reported hereby. A series of experiments were conducted to define the key param…
We investigated the effect of fire intensity from slash‐and‐burn agriculture on the mineralogy of Oxisols in the Sepunggur area, Jambi Province, Sumatra, Indonesia, in both field and laboratory experiments. Samples were collected from two depths (0–5 and 5–15 cm) at locations exposed to 100, 300, 600, and >600°C su…
Ferromagnetic Co nanowires have been electrodeposited into self-assembled porous anodic alumina arrays. Due to their cylindrical shape, the nanowires exhibit perpendicular anisotropy. The coercivity, remanence ratio, and activation volumes of Co nanowires depend strongly on the length, diameter, and spacing of the nan…
The effect of Co2+Ti4+ substitution on complex permeability, permittivity, and microwave absorption has been studied for [Ca(CoTi)xFe12−2xO19]96.0[La2O3]4.0 ferrite-epoxy composites, wherein x varies from 0 to 1.0 in steps of 0.2, in the frequency range from 8.0 to 12.4 GHz. The ferrites with x>0 exhibit signif…
Ferromagnetic shape-memory alloys have recently emerged as a new class of active materials showing very large magnetic-field-induced extensional strains. Recently, a single crystal of a tetragonally distorted Heusler alloy in the NiMnGa system has shown a 5% shear strain at room temperature in a field of 4 kOe. The ma…
Crystallization within the discrete spheres of a block copolymer mesophase was studied by time-resolved x-ray scattering. The cubic packing of microdomains, established by self-assembly in the melt, is preserved throughout crystallization by strong interblock segregation even though the amorphous matrix block is well…
Monoclinic gallium oxide nanowires are prepared here by arc discharge of GaN powder in the presence of a small amount of transition metal catalyst. The nanowires are characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, and Raman spectroscopy, and evidence as to the mechanism of their formation (sh…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLarge Free Volume in Maximally Interpenetrating Networks: The Role of Secondary Building Units Exemplified by Tb2(ADB)3[(CH3)2SO]4·16[(CH3)2SO]1Theresa M. Reineke, Mohamed Eddaoudi, David Moler, M. O'Keeffe, and O. M. YaghiView Author Information Materials Design and D…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCreation of Both Right-Handed and Left-Handed Silica Structures by Sol−Gel Transcription of Organogel Fibers Comprised of Chiral Diaminocyclohexane DerivativesJong Hwa Jung, Yoshiyuki Ono, Kenji Hanabusa, and Seiji ShinkaiView Author Information Chemotransfiguration Pr…
Folic acid, attached to polyethyleneglycol-derivatized, distearoyl-phosphatidylethanolamine, was used to target in vitro liposomes to folate receptor (FR)-overexpressing tumor cells. Confocal fluorescence microscopic observations demonstrated binding and subsequent internalization of rhodamine-labeled liposomes by a h…
Coating extremely thin degradable template polymer fibers with the desired wall materials forms the basis of the straightforward and highly versatile method described here for the production of polymer, metal, and hybrid nano- and mesotubes. Tubes with highly structured inner surfaces (see Figure) may be fabricated, w…