Materials Literature
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Colloidal quantum rods of cadmium selenide (CdSe) exhibit linearly polarized emission. Empirical pseudopotential calculations predict that slightly elongated CdSe nanocrystals have polarized emission along the long axis, unlike spherical dots, which emit plane-polarized light. Single-molecule luminescence spectroscopy…
We consider colloidal particles in a binary solvent. The solvent mixture has a solubility gap. The system is studied, from a solvent point of view, in the one-phase region near the binodal. The colloidal stability is significantly influenced by a mechanism called capillary condensation. In the confined space between p…
Why does not gravity make drops slip down the inclined surfaces, e.g., plant leaves? The current explanation is based on the existence of surface inhomogeneities, which cause a sustaining force that pins the contact line. Following this theory, the drop remains in equilibrium until a critical value of the sustaining f…
The processes by which the silica-network structure is formed in reverse micelles were elucidated. The reverse micellar system was composed of didodecyldimethylammonium bromide (DDAB), cyclohexane, and HCl− aqueous solution, and the silica source was tetraethoxysilane (TEOS). The hydrolysis reactions for TEOS were com…
This paper, second in a series, reports the cationic polymerization of 3-ethyl-3-(hydroxymethyl)oxetane leading to branched polyethers containing exclusively methylol groups attached to the quaternary carbon atoms (primary hydroxyl groups). GPC chromatograms and MALDI TOF spectra of the isolated polymers demonstrated…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionDesign and Therapeutic Application of Matrix Metalloproteinase Inhibitors. (Chem. Rev. 1999, 99, 2735−2776. Published on the Web September 8, 1999).Mark Whittaker, Christopher D. Floyd, Peter Brown, and Andrew J. H. GearingCite this: Chem. Rev. 2001, 101, 7, 2205–220…
A general route for the synthesis of homogeneous mixed-element oxides, based on the use of block polyalkylene oxide copolymers and single-source molecular precursors, is described. Thermolytic decomposition of the molecular precursors in the presence of an anhydrous solution of the block copolymer (in toluene) led to…
Rhodamine 6G-doped mesostructured silica is prepared by an acidic sol−gel route using poly- b -poly(propylene oxide)- b -poly(ethylene oxide) (EO x −PO y −EO x ) block copolymer surfactants. Using low-refractive-index ( n ∼ 1.2) mesoporous SiO 2 as a support, the synthesis is combined with soft lithography to produce…
SERS spectroscopy requires the illumination of delicate metal structures with intense laser light. In the present paper, the effect of laser illumination on these structures is investigated for silver island films and silver films over alumina particles in focused laser beams and at the tip of fiber-optic SERS sensors…
The role of flexibility on the liquid crystal isotropic-nematic phase transition has been studied by means of Monte Carlo simulation. We present equations of state for the isotropic-nematic branches and, in the isotropic phase, numerically calculated values for the virial coefficients B2, B3, and B4. We have studied t…
Diatoms are potentially the most important biomonitors of environmental change in high arctic lakes and ponds, but to date few autecological data are available. Because of the shallow nature of many of these water bodies, a large proportion of taxa are periphytic and planktonic diatoms are absent for the most part. By…
Contact angle measurements have been widely used to estimate the surface energy of various materials. Such measurements are severely limited with substrate surfaces that exhibit surface restructuring, are contaminated, and/or are porous. Although the captive bubble/drop method addresses the capillarity problem, surfac…
We study the monodomain (single-crystal) nematic elastomer materials, all side-chain siloxane polymers with the same mesogenic groups and crosslinking density, but differing in the type of crosslinking. Increasing the proportion of long di-functional segments of main-chain nematic polymer, acting as network crosslinki…
The non-equilibrium tunnel transport processes are considered in a square lattice of metallic nanogranules embedded into insulating host. Based on a simple model with three possible charging states (+,-, or 0) of a granule and three kinetic processes (creation or recombination of a +- pair, and charge transfer) betwee…
We have employed the multiple image method to compute the interparticle force for a polydisperse electrorheological (ER) fluid in which the suspended particles can have various sizes and different permittivites. The point-dipole (PD) approximation being routinely adopted in computer simulation of ER fluids is shown to…
An extension of the Burton-Cabrera-Frank model [Phil. Trans. R. Soc. London, Ser. A 243, 299 (1951)] including diffusion along steps and entropic step-step interaction is introduced. This extended model is successfully applied to simulate experiments done in the group of H.-J. Ernst at CEA Saclay, France, for vicinal…
The electron theory of metals describes how electrons are responsible for the bonding of metals and subsequent physical, chemical and transport properties. This textbook gives a complete account of electron theory in both periodic and non-periodic metallic systems. The author presents an accessible approach to the the…
Abstract The effects of water, sorbitol and a sucrose fatty acid ester (SE) on the water sorption behaviour and thermal and mechanical properties of pullulan‐based edible films as well as the physiological responses of fruit coated with pullulan have been studied. Incorporation of sorbitol or SE in pullulan films resu…
Small-diameter (ca. 0.7 nm) single-wall carbon nanotubes are predicted to display enhanced reactivity relative to larger-diameter nanotubes due to increased curvature strain. The derivatization of these small-diameter nanotubes via electrochemical reduction of a variety of aryl diazonium salts is described. The estima…
The tensile mechanical behavior of a short carbon fiber filled liquid crystalline polymer (LCP) composite, Vectra A230, was examined under static extension and dynamic loading at three temperatures. Dynamic tension was applied using a pendulum-type tensile spilt Hopkinson bar device. Specimens fabricated according to…