Materials Literature
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Poly(lactic acid), PLA, was blended with monomeric and oligomeric plasticizers in order to enhance its flexibility and thereby overcome its inherent problem of brittleness. Differential scanning calorimetry, dynamic mechanical analysis, transmission electron microscopy, and tensile testing were used to investigate the…
Squaraines belong to an important class of organic dyes with intense absorption and emission properties in the visible to near-IR wavelength range. The optical properties of squaraines, which are sensitive to the surrounding medium, make them ideal candidates to photophysists to study the excited-state properties and…
Interfacial interactions underpin phenomena ranging from adhesion to surface wetting. Here, we describe a simple, rapid, and robust approach to modifying solid surfaces, based on an ultrathin cross-linkable film of a random copolymer, which does not rely on specific surface chemistries. Specifically, thin films of ben…
Natural Fibers, Biopolymers, and Biocomposites: An Introduction A.K. Mohanty, M. Misra, L.T. Drzal, S.E. Selke, B.R. Harte, and G.Hinrichsen Plant Fibers as Reinforcement for Green Composites A. Bismarck, S. Mishra, and T. Lampke Processing of Bast Fiber Plants for Industrial Application F. Munder, C. Furll, and H.Hem…
Abstract Ab‐initio electronic structure calculations using the local density (LDA) and generalized gradient approximations (GGA) are undertaken on Potassium Titanyl Phosphate (KTP) and isomorphic materials. The crystal structure is better predicted using one of the GGA approximations. The affect of Rb replacing K on t…
We present molecular dynamics simulations of the optical Kerr effect in liquid and supercooled water and compare with recent time-resolved Kerr spectroscopy measurements [R. Torre, Nature (London) 428, 296 (2004)]. The short time features of the Kerr response, characterized by peaks near 15, 60, and 160 fs, are weakly…
Two new crystalline resorcinarene-based xanthone inclusion complexes, CECRxanthoneMeOH (1), and HECR2 xanthone6 MeOH (2) (CECR = C-ethylcalix[4]resorcinarene, HECR = hexaethylresorcin[6]arene) have been prepared to study the relation between photophysical properties and solid-state structure. Compared with the neat cr…
A series of novel polyiron species have been prepared from the reaction of iron chloride with the 2,5-disubstituted pyridines H2L(n) (H2L1) = N,N'-bis(n-butylcarbamoyl)pyridine-2,6-dicarboxamide; H2L2 = N,N'-bis(n-ethylcarbamoyl)pyridine-2,6-dicarboxamide). By small modifications of the experimental conditions under w…
The effects of AlOx-cap layer on the optical and photoelectrical properties of ZnO films have been studied by cathodoluminescence (CL), photoluminescence (PL), and photoconductivity (PC). Both the PL and CL show that the cap layer improves the emission characteristics of ZnO by enhancing the band-edge emission while a…
Abstract Polymeric microspheres were prepared from a Merrifield resin via nitroxide‐mediated radical polymerization. Polystyrene, poly(acetoxystyrene), and poly[styrene‐ b ‐(methyl methacrylate‐ co ‐styrene)], poly(acetoxystyrene‐ b ‐styrene), and poly(styrene‐ co ‐2‐hydroxyethyl methacrylate) copolymers were demonstr…
Magnetization, electrical-resistance and specific-heat measurements have been performed on the ABO 3 -type half-doped Eu 0.5 Sr 0.5 MnO 3 manganite compound. These studies reveal successive sharp step-like metamagnetic transitions at low temperatures. The steps are sharp at T ⩽ 3 K but smeared above 3 K, signifying th…
We report a critical enhancement of the nonlinear optical response of dye-doped liquid crystals obtained by approaching the clearing point in the nematic phase. The enhancement of the nonlinear diffraction efficiency has been measured in the range 0.2–0.3 deg below the nematic-isotropic transition temperature. It allo…
We report on the cluster glass nature and photoinduced magnetization (PIM) of (Ni,Zn,Fe,Ti)3O4 thin films prepared using a pulsed-laser deposition (PLD) technique. The films exhibit cluster glass behaviors with a spin-freezing temperature Tf of approximately 230 K. It was found that the magnetization increases followi…
We report on the crystallization of colloidal crystals comprising of charged particles with different size ratio dispersed in thoroughly deionized water. Single components were characterized carefully and their nucleation behavior was investigated before the preparation of mixtures. Mixtures investigated at constant p…
Polypyrrole films doped with ABTS {2,2‘-azinobis(3-ethylbenzothiazoline-6-sulfonate)} show multicolor electrochromism: the anodic coloration from brown at 0.0 V to greenish blue at 0.8 V due to oxidation of ABTS to its radical; and the cathodic coloration to yellow (−1.0 V) based on the reduction of polypyrrole itself.
Nanocrystalline diamond (NCD) has attracted great attention both experimentally and theoretically in the past few years. The identification of the presence and the amount of NCD in amorphous carbon film has been a challenging issue. Although Raman spectroscopy has become a standard tool for the characterization of var…
The magnetoresistance (MR) in cold-pressed magnetite nanopowders has been studied using pulsed magnetic field up to 42 T and steady field up to 12 T. Ball milling in air produces pure and stoichiometric Fe3O4 grains of nanometric size coated by a thin layer of Fe2O3, which electrically isolates the magnetite and acts…
The crystal and magnetic structure of ${\mathrm{Ba}}_{5}{\mathrm{Co}}_{5}{\mathrm{O}}_{14}$ has been determined by means of x-ray and neutron diffraction. This oxide has trigonal symmetry (space group $P\text{\ensuremath{-}}3m1$) and lattice parameters $a=5.6453(3)\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ and $c=11.9…
A new method to prepare monolayers of ω-alk-1-ene-silane-functionalized Fe3O4 nanoparticles, covalently linked to a hydrogen-terminated silicon (111) surface by thermal hydrosilylation is reported (see Figure). The nanoparticle monolayer on silicon system was structurally and magnetically characterized, and the techni…
Micrometer-sized carbon–cobalt spheres are demonstrated to be formed by the pyrolysis at 650 °C of a dicobalthexacarbonyl-complexed poly(p-phenyleneethynylene) derivative (see Figure). The spheres are obtained in quantitative yield and are shown to be composed of cobalt, carbon, and potentially a small amount of oxyge…