Materials Literature
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The authors investigated the polymer-mediated colloidal interactions in a good solvent wherein the particle size varies from that much smaller than the polymer radius of gyration up to macroscopic and the polymer concentration varies from that corresponding to a dilute solution to that close to a melt. At conditions d…
We present results from constant pressure molecular-dynamics simulations for a bead-spring model of a crystallizable polymer melt. Our model has two main features, a chemically realistic intrachain rigidity and a purely repulsive interaction between nonbonded monomers. By means of intrachain and interchain structure f…
We show that the intrinsic spin orbit interaction in a single plane of graphene converts the ideal two dimensional semi metallic groundstate of graphene into a quantum spin Hall (QSH) state. This novel electronic phase shares many similarities with the quantum Hall effect. It has a bulk excitation gap, but supports th…
Abstract A numerical simulation of melt spinning reveals bifurcation of dynamic solutions leading to limited spinning conditions. The bifurcation phenomenon is controlled by stress‐oriented crystallization and crystallinity‐dependent polymer viscosity. Under the conditions of bifurcation, the space of the spinning con…
Two-dimensional electrons in graphene are known to behave as massless fermions with Dirac-Weyl type linear dispersion near the Dirac crossing points. We have investigated the collective excitations of this system in the presence or absence of an external magnetic field. Unlike in the conventional two-dimensional elect…
We report on a systematic neutron powder diffraction (NPD) study of polycrystalline La(7/8)Sr(1/8)Mn(1-γ)O(3+δ) compounds. We investigated the structural and magnetic phases and transitions in the temperature range between 10 and 900 K for two different samples: an Ar-annealed sample with an orthorhombic Pbnm (Z = 4;…
Abstract The first principles calculations by using the plane‐wave pseudopotential method in the scheme of density functional theory were performed for polymorphs of ZnO: wurzite‐, zinc‐blende‐, rocksalt‐structures, and yet experimentally undiscovered CsCl‐structure. The elastic behavior and the stability of the struc…
Abstract Boehmite particles modified with organic ligands were prepared through the reaction of boehmite with acrylic acid or diethylphosphoric acid (formed in situ from triethyl phosphate). The chemical structures of these particles were determined, and it was shown that they formed stable aqueous dispersions with a…
Abstract Polyaniline (PAni) grafted nano silica were synthesized successfully by in situ polymerization of aniline (An) using ammonium persulphate (APS) as oxidant by three procedures: Firstly, γ‐(2,3‐epoxypropoxy)propyltrimethoxysilane (EPTMS) reacted with nano silica. Secondly, the EPTMS modified nano silica reacted…
We report the complete set of elastic constants and the bulk modulus for single-crystal $\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}$ (PMN) at room temperature obtained from Brillouin spectroscopy and molecular-dynamics (MD) simulations. The bulk modulus from Brillouin spectroscopy is found to…
Abstract Several new polyurethane networks based on hyperbranched polyesters (trade name Boltorn) were synthesized to investigate the influence of the hyperbranched crosslinking agent on the molecular dynamics of the linear segments containing urethane groups. For comparison, linear polyurethanes as well as polyuretha…
BACKGROUND: In microorganisms and plants, the first two reactions of arginine biosynthesis are catalyzed by N-acetylglutamate synthase (NAGS) and N-acetylglutamate kinase (NAGK). In mammals, NAGS produces an essential activator of carbamylphosphate synthetase I, the first enzyme of the urea cycle, and no functional NA…
Abstract The earlier suggested definition, “a solid is a condensed phase at a temperature below its glass transition,” has developed into the key to the understanding of macromolecular materials. Its importance and implications for the understanding of not only polymers but all materials are reviewed in this article.…
Mesoporous alumina has been synthesized first by a traditional precipitation method in a rotating packed bed (RPB) in a scaling experiment. Aluminum nitrate was used as source of aluminum, and poly(ethylene glycol) 1540 was used as the template. The characterization showed that the ordered wormlike pores and narrow po…
Based on measurements of soft-x-ray magnetic scattering and symmetry considerations, we demonstrate that the magnetoelectric effect in ${\mathrm{TbMn}}_{2}{\mathrm{O}}_{5}$ arises from an internal field determined by ${\stackrel{\ensuremath{\rightarrow}}{S}}_{\stackrel{\ensuremath{\rightarrow}}{q}}\ifmmode\times\else\…
To obtain well-defined dendritic-graft copolymer grafted silica nanoparticles (SN-HBP-PMMA), the surface halogen atom of the hyperbranched polymer grafted silica nanoparticles (SN-HBP), by surface-initiated self-condensing vinyl polymerization (SI-SCVP) of p -chloromethyl styrene (CMS) from functionalized silica nanop…
Abstract Blends of poly( L ‐lactide) (PLA), containing from 5, 15, or 25 wt % potato starch, unmodified or hydrophobized in methane plasma, were prepared and studied. To enhance the drawability of the blends, the plasticization of PLA with 10 wt % poly (ethylene glycol) (PEG) was also employed. The thermal and mechani…
The optimization of biosensing efficiency on a diamond platform depends on the successful coupling of biomolecules on the surface, and also on effective signal transduction in the biorecognition events. In terms of biofunctionalization of diamond surfaces, surface electrochemical studies of diamond modified with undec…
Combined ab initio and grand canonical Monte Carlo simulations have been performed to investigate the dependence of hydrogen storage in single-walled carbon nanotubes (SWCNTs) on both tube curvature and chirality. The ab initio calculations at the density functional level of theory can provide useful information about…
Abstract The chemical modification of a thermoplastic polyurethane (TPU) has been realized by the grafting of polyisocyanates onto urethane groups through allophanate bonds to prepare self‐crosslinkable but still thermoplastic materials. Because of the lateral isocyanate groups, the resulting polymer can be easily cro…