Materials Literature
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The self-assembly of Pluronic block copolymers in dispersions of single-wall carbon nanotubes (SWNT) was investigated by spin probe electron paramagnetic resonance (EPR) spectroscopy. Nitroxide spin labeled block copolymers derived from Pluronic L62 and P123 were introduced in minute amounts into the dispersions. X-ba…
The structure of a monolayer phase of $\mathrm{Ti}{\mathrm{O}}_{x}$ on Pt(111) showing a zigzag-like contrast is investigated by scanning tunneling microscopy (STM) and density-functional calculations. Because of its peculiar defectivity, strongly dependent on the postdeposition thermal treatments, this system is an i…
Abstract In this study, high‐performance thermoset polymer composites are synthesized by using both long fibers and nanoclays. Epoxy and phenolic resins, the two most important thermoset polymers, are used as the polymer matrix. The hydrophobic epoxy resin is mixed with surface modified nanoclay, while the hydrophilic…
The photochromic and thermochromic behavior of four commercially available Reversacol dyes are presented. The compounds studied belong to the class of spirooxazines and naphthopyrans, which are typically thermoreversible photochromic molecules. On stimulation with UV light, these compounds become colored and exhibit s…
We perform a theoretical study of the three-phase contact line and the line tension in an adsorbed colloid-polymer mixture near a first-order wetting transition, employing an interface displacement model. We use a simple free-energy functional to describe a colloid-polymer mixture near a hard wall. The bulk phase beha…
We report on the spectrally controlled photochemical tuning of the size, shape, and localized surface plasmon resonances of individual gold nanoparticles. Single spheres, extracted from a colloidal solution, and elongated nanodiscs, fabricated by electron beam lithography, were exposed to a gold salt solution while be…
The effect of catalyst composition, hydrocarbon flow rate, and synthesis temperature on the single-walled carbon nanotubes (SWCNTs) grown was studied through the evolution of the corresponding catalyst lifetime. Catalyst lifetime was estimated based on the analysis of Raman spectra of SWCNTs obtained by sequential int…
Intramyocardial injection of therapeutic agents may enhance heart repair after infarction. Incomplete retention of intramyocardial injections has been reported, but modes of loss are undefined. We determined the fate of neutron-activated microspheres injected into acutely ischemic rat myocardium using saline, Pluronic…
A simple effective pyrolysis technique has been developed to synthesize aligned arrays of multi-walled carbon nanotubes (MWCNTs) without using any carrier gas in a single-stage furnace at 700 °C. This technique eliminates nearly the entire complex and expensive machinery associated with other extensively used methods…
Interfacial electron transfer (ET) dynamics from excited rhodamine B (RhB) to three semiconductor nanocrystalline thin films (In 2 O 3, SnO 2, and ZnO) was investigated to examine their dependence on semiconductors. The injected electrons in the semiconductors were directly measured by their transient absorption in th…
Self-organization of ZnO nanoparticles into various superstructures (sheet, platelet, ring) has been achieved with the assistance of micelles formed by surfactant cetyltrimethylammonium bromide (CTAB) under one-pot condition. The CTAB-modified zinc hydroxy double salt (Zn-HDS) mesocrystals act as intermediates to form…
The neutron capture cross sections of the Zr isotopes have important implications in nuclear astrophysics and for reactor design. The small cross section of the neutron magic nucleus $^{90}\mathrm{Zr}$, which accounts for more than 50% of natural zirconium represents one of the key isotopes for the stellar $s$-process…
The energy loss of a uniformly moving dislocation radiating lattice waves is quantitatively studied by atomistic simulations. The velocity dependence of the energy radiation provides a unique way to understand limiting behavior exhibited by fast moving dislocations. In combination with theoretical analyses, the simula…
Ion-exchange media for cation or anion separations are employed in private industries such as mining, pharmaceutical, and chemical. Government organizations utilize ion-exchange processes for water treatment, environmental remediation and preservation, and nuclear waste treatment. Here, we present an investigation of…
We report a systematic study of the anomalous Hall effect in epitaxial thin films of magnetite grown on $\mathrm{MgO}\phantom{\rule{0.3em}{0ex}}(001)$ substrates as a function of film thickness (from 5 to $150\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$) and temperature $(60\phantom{\rule{0.3em}{0ex}}\mathrm{K}<T<300…
The active sites of metalloenzymes are often deeply buried inside a hydrophobic protein sheath, which protects them from undesirable hydrolysis and polymerization reactions, allowing them to achieve their normal functions. In order to mimic the hydrophobic environment of the active sites in bacterial monooxygenases, d…
A new class of Au(x)Ag(1-x) nanostructures with dendrite morphology and a hollow interior were synthesized by using a replacement reaction between Ag dendrites and an aqueous solution of HAuCl(4). The Ag nanostructured dendrites were generated by the reaction of AgNO(3) with ascorbic acid in a methanol/water system. T…
The organic side chain of tin-substituted Dawson polyoxotungstates alpha1- and alpha2-[P2W17O61{SnCH2CH2COOH}]7- can be used to direct regioselective acylations of oxo ligands in the inorganic backbone, which was examined both experimentally and computationally. Acylation of the oxo ligand gave exalted electrophilicit…
The new complex, [Zr(pda)2]n (1, pda2- = N,N'-bis(neo-pentyl)-ortho-phenylenediamide, n = 1 or 2), prepared by the reaction of 2 equiv of pdaLi2 with ZrCl4, reacts rapidly with halogen oxidants to afford the new product ZrX2(disq)2 (3, X = Cl, Br, I; disq- = N,N'-bis(neo-pentyl)-ortho-diiminosemiquinonate) in which ea…
Effects of pressure on the structures and magnetic properties of three types of 3-D cyanide-bridged bimetallic coordination polymer magnets, MnIICrIII ferrimagnet [Mn(en)]3[Cr(CN)6]2.4H2O (1; en = ethylenediamine), NiIICrIII ferromagnet [Ni(dipn)]3[Cr(CN)6]2.3H2O (2; dipn = N,N-di(3-aminopropyl)amine), and NiIIFeIII f…