Materials Literature
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Abstract The synthesis and characterization of dendritic homopolymers and block copolymers of ϵ‐caprolactone and lactide ( L ‐lactide and racemic lactide) were performed with multifunctional initiators in combination with living polymerization and the selective placement of branching junctures in a divergent growth st…
Abstract A method of recycling postconsumer poly(ethylene terephthalate (PET) using transesterification was studied. Shredded flakes of postconsumer PET waste were transesterified with higher diols, such as 1,4‐butanediol, 1,4‐cyclohexane dimethanol, and 1,6‐hexanediol, to yield copolyesters in the presence of Ti(iPrO…
Dynamic models for facet formation often employ a regularization of the surface energy based on a corner energy term. Here we consider the effect of this regularization on the equilibrium shape of a solid particle in two dimensions. Using matched asymptotic expansions we determine the explicit solution for the corner…
This paper examines the important, and oftentimes dominant, role of particles in lead and copper corrosion by-product release from stagnant pipes. For copper pipes, orthophosphate generally reduced soluble copper levels compared to pipes with no inhibitor but had little effect on particulate copper, while pipes dosed…
Abstract Three new thiostannates [M(en) 3 ] 2 Sn 2 S 6 (en = ethylenediamine, M = Mn( 1 ), Co( 2 ) and Zn( 3 )) were synthesized by solvothermal method. The crystals were grown up in a Teflon‐lined steel autoclave at temperature about 180 °C. All the three compounds consist of discrete [Sn 2 S 6 ] 4— anions, which are…
OBJECTIVE: Vein graft disease involves neointimal smooth muscle cells, the origins of which are unclear. This study sought to characterize and quantitate vein graft infiltration by cells extrinsic to the graft in a mouse model of vein graft disease. METHODS AND RESULTS: Inferior vena cava-to-carotid artery interpositi…
Biofunctional nanohybrids are synthesized from layered double hydroxide (LDH) and the vitamins such as ascorbic acid and topopherol acid succinate. Either ion exchange or copricipitaion leads to successful intercalation of the vitamins into gallery space of LDH that offers a new route to safe preservation of bioactivi…
Using a mica surface force balance, we have measured the interactions between mica surfaces bearing chitosan (a common, naturally occurring, cationic polysaccharide; the average molecular weight of our sample was 6 × 10 5, degree of deacetylation 85%) adsorbed from acetic acid solution. We also introduced a polyionic…
Graft polymerization has been used, for the first time, to prepare a dense conductive polymer coating on free-standing luminescent silicon nanoparticles. The silicon nanoparticles maintained their photoluminescence and crystallinity after surface modification. The nanoparticles were first surface hydroxylated and then…
The influence of surface structure on NO chemisorption and dissociation on Pt[100]-(1x1), Pt[211], and Pt[410] has been studied using density functional theory slab calculations with the generalized gradient corrections. The presence of steps on Pt[211] strengthens the NO-surface chemisorption bond, but the barrier fo…
A class of translation bounded complex measures, which have the form of weighted Dirac combs, on locally compact Abelian groups is investigated. Given such a Dirac comb, we are interested in its diffraction spectrum which emerges as the Fourier transform of the autocorrelation measure. We present a sufficient set of c…
Atomistic simulations of double-walled carbon nanotubes (DWCNTs) as rotational bearings were performed. Molecular mechanics (MM) calculations show that the interlayer energy surface of the bearings is nearly flat. Thermal effects on the bearings were studied with molecular dynamics (MD) simulations at finite temperatu…
The uniaxial compressive response of steel fiber-reinforced concrete (SFRC) subjected to high strain rate loading is presented. Details of an experimental investigation using a 75-mm-diameter split Hopkinson pressure bar (SHPB) are outlined. The investigation focuses on recorded data and results in distinguishing the…
Novel N,O-acyl chitosan (NOAC) derivatives were synthesized to examine their fungicidal activity against the gray mould fungus Botrytis cinerea (Leotiales: Sclerotiniaceae) and the rice leaf blast fungus Pyricularia oryzae (Teleomorph: Magnaporth grisea). The fungicidal activity was evaluated by the radial growth bioa…
We propose a simple continuum model to interpret the shearing motion of dense, dry and cohesion-less granular media. Compressibility, dilatancy and Coulomb-like friction are the three basic ingredients. The granular stress is split into a rate-dependent part representing the rebound-less impacts between grains and a r…
We investigated the precipitation of carbonates by Halobacillus trueperi in both solid and liquid media at different salt concentrations and different magnesium/calcium ratios. H. trueperi precipitated at all assayed salt concentrations. When salt concentration increased, the quantity and the size of bioliths decrease…
Abstract Polyaniline (PANI) was prepared by the oxidation of aniline in the presence of various inorganic and organic acids at 20 °C and −50 °C. When strong acids were used, the conductivity of the protonated PANI was typically 1–10 S cm −1 . The results indicate that the protonation of PANI in media containing carbox…
In nuclear-spin-polarization-induced quantum dots the electrons are confined through local nuclear spin polarization. The model electron confinement potential is time-dependent due to the nuclear spin diffusion and relaxation processes. It can be well-approximated by a Gaussian curve which is not an exactly solvable p…
A tetragonal (Bain path) distortion of a metal with an fcc (bcc) ground state will initially cause an increase in energy, but at some point along the Bain path the energy will again decrease until a local minimum is reached. Using a combination of parametrized tight-binding and first-principles LAPW calculations we sh…
Superperiodic patterns were observed by STM on two kinds of finite-sized graphene sheets. One is nanographene sheets inclined from a highly oriented pyrolitic graphite (HOPG) substrate and the other is several-layer-thick graphene sheets with dislocation-network structures against a HOPG substrate. As for the former,…