Materials Literature
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Colloidal particles or nanoparticles, with equal affinity for two fluids, are known to adsorb irreversibly to the fluid-fluid interface. We present large-scale computer simulations of the demixing of a binary solvent containing such particles. The newly formed interface sequesters the colloidal particles; as the inter…
Pairs of noble metal nanoparticles can be used to measure distances via the distance dependence of their plasmon coupling. These "plasmon rulers" offer exceptional photostability and brightness; however, the advantages and limitations of this approach remain to be explored. Here we report detailed plasmon peak versus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCurved Pi-Conjugation, Aromaticity, and the Related Chemistry of Small Fullerenes (<C60) and Single-Walled Carbon NanotubesXin Lu and Zhongfang ChenView Author Information State Key Laboratory of Physical Chemistry of Solid Surfaces & Center for Theoretical Chemistry, Depart…
A methodology is described to systematically derive coarse-grained (CG) force fields for molecular liquids from the underlying atomistic-scale forces. The coarse graining of an interparticle force field is accomplished by the application of a force-matching method to the trajectories and forces obtained from the atomi…
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[reaction: see text] A pair of chiral, branched monomer building blocks, consisting of a solvatochromic probe and a spectroscopically inactive volume dummy, has been developed. The probe can selectively be excited, and its fluorescence characteristics provide information about local polarity. Incorporation of these mo…
Highly textured Bi 3 NbTiO 9 ceramics are fabricated by normal sintering from molten salt‐synthesized plate‐like crystallites. Fine Bi 3 NbTiO 9 plate‐like crystallites (∼1 μm) not only facilitate the densification, but also enhance texture in Bi 3 NbTiO 9 ceramics. Weak‐agglomerated platelets exhibit higher sinterabi…
Automatic fitting methods that build molecules into electron-density maps usually fail below 3.5 A resolution. As a first step towards addressing this problem, an algorithm has been developed using an approximation of the medial axis to simplify an electron-density isosurface. This approximation captures the central a…
Abstract Summary: Polyurethane/silica hybrid coatings were prepared via in situ (IS) or blending (BL) method using different acidic silica sols. The effects of preparation methods, silica types, and content on the structure and mechanical properties of the hybrid coatings were investigated. It was found that there exi…
Abstract The crystal structures of solvent-free lithium, sodium, rubidium, and cesium squarates have been determined from high resolution synchrotron and X-ray laboratory powder patterns. Crystallographic data at room temperature of Li 2 C 4 O 4 : a = 7.1073(3) Å, b = 9.5627(4) Å, c = 3.2973(1) Å, β = 101.11(1)°, V =…
The coherent spin dynamics of holes in Mg-doped ($p$-type) wurtzite GaN is studied by time-resolved Kerr rotation technique. We observe the spin precession of holes with the spin coherence time of $120\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$, which is distinguished from that of electrons by comparison with the results…
Indirect high resolution electron microscopy using one of several possible data-set geometries offers advantages over conventional high-resolution imaging in enabling the recovery of the complex wavefunction at the specimen exit plane and simultaneously eliminating the aberrations present in the objective lens. This a…
Abstract For three icosahedral alloys in the Mg—Zn- RE ( RE = Ho, Y) systems, the atomic pair distribution functions (PDFs) have been obtained from sealed X-ray tube (in-house) and synchrotron (ESRF and APS) powder diffraction experiments. The PDFs are at least qualitatively comparable and are suitable for least squar…
We prepared a novel composite consisting of a side chain liquid crystalline polysiloxane matrix and gold nanoparticles. We showed that the size and morphology of the nanoparticles were strongly linked to the macroscopic organization of the mesophase during reduction of gold ions
Nanophase aluminum powder was characterized in a field-emission-gun transmission electron microscope (TEM). Different techniques were used to investigate the structure of the particles, including conventional bright-field and dark-field imaging, scanning transmission electron microscopy (STEM), high-resolution lattice…
Tubular carbon cones (TCCs) with nanometer-sized tips and micrometer-sized roots, having a herringbone hollow interior surrounded by helical sheets of graphite coiling around, were grown on Au wires by hot filament chemical vapor deposition (HFCVD). These TCCs exhibit excellent field emission properties with a very lo…
BACKGROUND: It has been suspected that synthetic colloids may interfere with leukocyte adhesion by down-regulation of endothelial cell adhesion molecules. Although inhibition of endothelial inflammation might reduce leukocyte-related tissue injury, the same mechanism may be detrimental for host defense during severe i…
The novel crystallization properties of nano-materials represent a great challenge to researchers across all disciplines of materials science. Simple binary solids can be found to adopt unprecedented structures, when confined into nanometer-sized cavities, such as the inner cylindrical bore of single-walled carbon nan…
The infrared reflectivity spectra of a ${\mathrm{Pr}}_{2}\mathrm{Ni}{\mathrm{O}}_{4+\ensuremath{\delta}}$ single crystal and its high-temperature dependence (300--1300 K) are investigated for light polarized in the basal plane. Fitting with the appropriate model allows one to discriminate localized and itinerant charg…
Experimental data associated with plastic deformations indicate that the temperature is less than that predicted from dissipation based on plastic work. To obtain reasonable correlation between theoretical and experimental results, the plastic work is often multiplied by a constant beta. This paper provides an alterna…