Materials Literature
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The physical and chemical properties of PPI dendrimers' interior were investigated using the fluorescent, solvatochromic probe phenol blue. In aqueous solutions of each generation studied, two discrete dye populations were clearly observed. PPI dendrimers were shown to form a tight, nonpolar association with the vast…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDirecting Energy Transfer within Conjugated Polymer Thin FilmsJinsang Kim, D. Tyler McQuade, Aimee Rose, Zhengguo Zhu, and Timothy M. SwagerView Author Information Department of Chemistry and Department of Materials Science and Engineering and the Center for Materials…
The synthesis and X-ray characterization of a novel two-dimensional network of copper(II) and nickel(II) heteronuclear complexes with two different thiocyanate groups are reported, together with a preliminary study of the magnetic properties.
Abstract This article presents the results of an experimental study on the preparation and properties of new ternary composites composed of nano‐Al 2 O 3 particles, polyester, and epoxy resin. The ternary composites were prepared by the addition of the nano‐Al 2 O 3 particles in a binary matrix, with elevated viscosit…
Layered double hydroxides (LDHs) with a cation composition of LiAl(2) have a wide range of potential applications as catalysts, catalyst supports, and precursors for refractory oxide materials, including several industrially important lithium aluminate phases. The understanding of the calcination behavior of this grou…
We present the results of a systematic x-ray scattering study of the charge and orbital ordering in the manganite series ${\mathrm{Pr}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ with $x=0.25,$ 0.4, and 0.5. The temperature dependence of the scattering at the charge and orbital wavevectors, and of the latt…
The motion and shape evolution of viscous drops made from a dilute suspension of tiny, spherical glass beads sedimenting in an otherwise quiescent liquid is investigated both experimentally and theoretically for conditions of low Reynolds number. In the (presumed) absence of any significant interfacial tension, the Bo…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThree-Dimensional Superlattices Built from (M4In16S33)10- (M = Mn, Co, Zn, Cd) Supertetrahedral ClustersCheng Wang, Yuqi Li, Xianhui Bu, Nanfeng Zheng, Olivera Zivkovic, Chung-Sung Yang, and Pingyun FengView Author Information Department of Chemistry, University of Cal…
The jarosites make up the most studied family of {\it kagomé} antiferromagnets. The flexibility of the structure to substitution of the A and B ions allows a wide range of compositions to be synthesised with the general formula AB3(SO4)2(OH)6 (A = Na$^+$, K$^+$, Ag$^+$, Rb$^+$, H3O$^+$, NH4$^+$, 1/2Ba$^{2+}$, and 1/2P…
Group Theory techniques can aid greatly the determination of magnetic structures. The integration of their calculations into new and existing refinement programs is an ongoing development that will simplify and make more rigorous the analysis of experimental data. This paper presents an overview of the practical appli…
The cohesion mechanism of cubic approximant crystals in newly discovered binary quasicrystals, Cd(6)M ( M = Yb or Ca), is studied theoretically. It is found that stabilization due to alloying is obtained if M is an element with low-lying unoccupied d states. This leads to the conclusion that the cohesion of Cd-based c…
Abstract Simple esterification and etherification reactions were applied to steam‐exploded Flax ( Linum usitatissimum ) with the aim of changing the surface properties through modification of fiber surface chemistry. Native and chemically modified cellulose fibers were characterized in terms of thermal stability, surf…
We report on a study of spherical polyelectrolyte brushes that consist of a solid core onto which linear polyelectrolyte chains are chemically grafted. The core particles are made up of solid poly(styrene) and have a radius R of ca. 50 nm. As polyelectrolyte chains the weak polyelectrolyte poly(acrylic acid) or the st…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPolymer Functionalization for Air-Stable n-Type Carbon Nanotube Field-Effect TransistorsMoonsub Shim, Ali Javey, Nadine Wong Shi Kam, and Hongjie DaiView Author Information Department of Chemistry, Stanford University Stanford, California 94305 Cite this: J. Am. Chem.…
Wave propagation in a double negative (DNG) medium, i.e., a medium having negative permittivity and negative permeability, is studied both analytically and numerically. The choices of the square root that leads to the index of refraction and the wave impedance in a DNG medium are determined by imposing analyticity in…
Optical polymers which exhibit no birefringence with any orientation of polymer chains are desirable to realize high performance optical devices that handle polarized light. We defined such polymers as 'zero-birefringence polymer' and demonstrated two methods for synthesizing the zero- birefringence polymers: the rand…
Atomic force microscopy (AFM) is used in contact mode with a conducting tip to probe the conducting network of the conductive polymer polyaniline blended in an insulating polymer matrix. The high resistance contrast and sharp boundaries between conductive and insulating phases is observed down to scales in the 10 nm r…
Abstract Oxides CaO, MgO and a physical mixture of 10% CaO + 90% MgO were used as catalysts for the steam gasification of naphthalene. A synergistic effect in the conversion was observed with the mixture. Catalysts were characterized by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and XPS techn…
Single-walled carbon nanotubes (SWNTs) have been produced in high yield by the dc arc discharge technique under gravity-free conditions. Gravity-free conditions can reduce the convection flow of the buffer gas during the arc discharge, which results in the increase of high thermostatic volume around the arc flame. The…
Imaging of As- and B-doped silicon regions has been performed in a scanning electron microscope operated in the cathode lens mode, with incident electron energies (EP) as low as 15 eV. The doped regions of n+ (As, 2.5×1020 cm−3) and p+ (B, 8×1019 cm−3) on n-type silicon (∼1015 cm−3) show distinct contrast with electro…