Materials Literature
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Abstract Prolonged exposure (>90 days) of bovine β‐lactoglobulin (BLG) to subdenaturing concentrations of either urea or potassium thiocyanate resulted in the formation of ordered polymers in the form of fibrils. The fibrils obtained with each chaotrope showed major differences in morphology, surface properties, th…
The authors have studied the structural evolution of the fragile glass-forming liquid CaAl2O4 during supercooling from the stable liquid phase to the cold glass below Tg. The evolution is characterized by a sharpening of the first diffraction peak and a shortening of the average nearest-neighbor bond length around 1.2…
In situ transmission electron microscopy studies have been carried out to determine the effect of temperature and pressure on the growth of carbon nanotubes by the Ni-catalyzed chemical vapour deposition of acetylene. The temperature range explored was 450–650 °C and the acetylene pressure range was 0.8–20 mTorr. Our…
Elucidation of the molecular composition and physical properties of spider glue is necessary to understand its function in the mechanics of the web and prey capture. Previous reports have indicated that components of the adhesive coating contain inorganic molecules, phosphorylated glycoproteins, lipids, and organic lo…
The authors study the combination of two independent strategies that enhance the hyperpolarizability of ionic organic chromophores. The first molecular-level strategy is the extension of the conjugation path in the active chromophore. The second supramolecular-level strategy is the bottom-up nanoengineering of an incl…
Bis(benzofuranonyl)methanolate (BM4i4i) dye and croconate dyes (derivatives of oxyallyl molecules) in general are known to have intense transitions in the near-infrared (NIR) region, indicating small transition energies and large transition dipole moments. These molecules have been reported in the literature to have v…
We have recently proposed a mechanism for the epoxidation of cyclooctene by H2O2 catalyzed by iron(III) [tetrakis(pentafluorophenyl)]porphyrin chloride, (F20TPP)FeCl, in solvent containing methanol [Stephenson, N. A.; Bell, A.T. Inorg. Chem. 2006, 45, 2758-2766]. In that study, we found that catalysis did not occur un…
We have characterized a montmorillonite-based organoclay dispersed in three different nonaqueous solvents using a combination of x-ray scattering, small-angle neutron scattering (SANS), and ultrasmall angle neutron scattering (USANS), together with rheological measurements. Consistent with these measurements, we prese…
The adsorption of Pd-isolated atoms and dimers on the (110) surface of rutile TiO 2 has been investigated in a range of coverage using a periodic supercell approach within density functional theory using a generalized gradient approach and plane-wave basis sets. Pd atoms prefer to adsorb on the surface channels near t…
We demonstrate using a combination of X-ray and neutron diffraction and X-ray photoelectron spectroscopy that Pd 2+ ions can be substituted for Ce in perovskite BaCeO 3 and that, under oxidizing conditions, BaCe 1 - x Pd x O 3 - δ (0 ≤ x ≤ 0.1) compositions can be prepared. Neutron diffraction has helped verify that δ…
Reverse-Keggin ions are reported in which a p-block element (antimony) occupies the twelve vertices of a truncated tetrahedron while a d-block element (manganese or zinc) occupies the tetrahedral central cavity. The exterior of the reverse-Keggins also acts as tridentate ligands to further d-block centers.
Abstract Poly(ε‐caprolactone) (PCL), a saturated polyester, derived from ring‐opening polymerization of ε‐caprolactone, was chemically crosslinked with various amounts of benzoyl peroxide (BPO) by a two‐step method by first evenly dispersing the BPO into the PCL matrix and then crosslinking at elevated temperature. Th…
The paper presents the synthesis of azobenzene-functionalized block copolymers based on a poly(methyl methacrylate) (PMMA) segment and an azobenzene-functionalized poly(hydroxyethyl methacrylate) segment, and a basic study of blending these block copolymers with homopolymers is given. Two diblock copolymers, prepared…
Abstract Poly( ε ‐caprolactone)/silica nanocomposites were prepared by the in situ technique. The molecular weight of the polymer was slightly reduced on increasing the amount of filler. Most likely, the silica nanoparticles affected the action of the polymerisation catalyst. Furthermore, it was found that especially…
A novel amphiphilic TTF hexamer 1 with a flexible disk-like structure and strong self-aggregation properties has been synthesized. Nanowires fabricated from both 1 and its cation radical 1 •+ in CHCl 3 /hexane solutions have a hexagonal columnar structure. In contrast, drop-cast films of 1 and 1 •+ exhibit an edge-to-…
Detailed studies of mechanisms for hydrogen dissociative adsorption and diffusion on pure and nitrogen-doped (8, 0) carbon nanotubes are carried out using the first-principles density functional theory method. (1) For pure carbon nanotubes, we have identified the energetically most favorable dissociative pathway for h…
A new bis-nitrilotriacetic acid (NTA) chelate with catechol anchor was synthesized and immobilized on superparamagnetic iron oxide nanoparticles. When loaded with Ni(II), these bis-NTA-immobilized nanoparticles were shown to bind polyhistidine (His x 6-tagged) fusion proteins in their native, folded conformations that…
RNA polymerases from Archaea and Eukaryotes consist of a core enzyme associated with a dimeric E'F (Rpb7/Rpb4) subcomplex but the functional contribution of the two subunit subcomplexes to the transcription process is poorly understood. Here we report the reconstitution of the 11-subunit RNA polymerase and of the core…
Bipolar liquid crystal drops moving inside microchannels exhibit periodic director field transformations due to induced circulating flows inside them. These modifications are characterized by changes in the type of point surface disclinations; they periodically change from splay to bend disclinations, implying the dro…
When solutions of aniline hydrochloride and ammonium peroxydisulfate were separated by a semipermeable cellulose membrane, the reactants met at the membrane and produced a polyaniline (PANI) membrane at the interface. The oxidative polymerization of aniline then proceeded in situ on the PANI-cellulose composite membra…