Materials Literature
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Free-radical-initiated grafting of maleic anhydride (MA) onto poly(butylene adipate-co-terephthalate) (PBAT), a biodegradable aliphatic-aromatic copolyester, was performed by reactive extrusion. 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane was used as the free-radical initiator. The peroxide concentration was varied be…
The effect of in-plane strain on the nonlinear dielectric properties of $\mathrm{SrTi}{\mathrm{O}}_{3}$ epitaxial thin films is calculated using density-functional theory within the local-density approximation. Motivated by recent experiments, the structure, zone-center phonons, and dielectric properties with and with…
A ring structure fabricated from GaAs is used to achieve interference of the net spin polarization of conduction band electrons. Optically polarized spins are split into two packets by passing through two arms of the ring in the diffusive transport regime. Optical pumping with circularly polarized light on one arm est…
In the Langevin formalism, the delicate balance maintained between the fluctuations in the system and their corresponding dissipation may be upset by the presence of a secondary, space-dependent stochastic force, particularly in the low friction regime. In prior work, the latter was dissipated self-consistently throug…
The multiprotein mammalian TRRAP/TIP60-containing histone acetyltransferase (HAT) complex performs critical functions in a variety of cellular processes including transcriptional activation, double strand DNA break repair, and apoptosis. We previously isolated the TRRAP/TIP60 complex from HeLa cells (Cai, Y., Jin, J.,…
We have developed a reactive force field (ReaxFF(MgH)) for magnesium and magnesium hydride systems. The parameters for this force field were derived from fitting to quantum chemical (QM) data on magnesium clusters and on the equations of states for condensed phases of magnesium metal and magnesium hydride crystal. The…
Monodisperse Pb spherical colloids are synthesized by thermally decomposing lead acetate in boiling tetra(ethylene glycol), followed by quenching with cold ethanol. These colloids are then used as chemical templates to produce core–shell or hollow Pb@PbS (see Figure) and Pb@Ag particles by reacting with sulfur vapor a…
In BiFeO3 films, it has been found that epitaxial constraint results in the destruction of a space modulated spin structure. For (111)c films, relative to corresponding bulk crystals, it is shown (i) that the induced magnetization is enhanced at low applied fields; (ii) that the polarization is dramatically enhanced;…
We report various structural and conformational properties of generations 4, 5, and 6 PAMAM (polyamidoamine) dendrimer [EDA (ethylenediamine) core)] at various protonation levels through extensive molecular dynamics (MD) simulations in explicit solvent. The presence of solvent leads to swelling of the dendrimer (by 33…
Silver nanoprisms with a unimodal size distribution are synthesized through a novel thermal route that permits some control over nanoprism-edge length (see Figure). The influences of citrate, poly(vinylpyrrolidone), H2O2, and NaBH4 on the nanostructures are described. This protocol allows control over nanoprism thickn…
Metallic bowtie nanoantennas should provide optical fields that are confined to spatial scales far below the diffraction limit. To improve the mismatch between optical wavelengths and nanoscale objects, we have lithographically fabricated Au bowties with lengths approximately 75 nm and gaps of tens of nm. Using two-ph…
Solid state deuteron magic angle spinning nuclear magnetic resonance spectra of conductive ring-deuterated polyaniline consist of two peaks, one at the same chemical shift as the insulating form of the polymer and the second shifted by 5.8+/-1 ppm. The magnitude of the shift is field and temperature independent and is…
The coordination effects induced on the 1 H-, 13 C-, and 15 N-NMR chemical shifts of the 3,5-di-(4-butoxyphenyl)-1H-pyrazole, HPzbp2 (1) have been quantified for the following complexes:-
As a target for structural genomics, Thermus thermophilus HB8 is a good choice because of its small gene size. The genome sequencing for T. thermophilus is currently being completed. These sequencing efforts have provided us with coding information for thousands of new proteins. Of these proteins, the TT1662 protein h…
Abstract High‐ T m (∼270 °C) relaxor ferroelectrics 0.40Pb(Fe 1/2 Nb 1/2 )O 3 –0.34PbZrO 3 –0.26PbTiO 3 (PFN40‐PZ34‐PT26) with pure perovskite phase were synthesized using conventional ceramic processing via a B‐site oxide mixing route for applications in high‐temperature high‐power‐density electrotransducers and high…
The surface of an anatase titanium dioxide (TiO 2 ) film grown on LaAlO 3 (001) was observed using noncontact atomic force microscopy (NC-AFM). After cleaning with cycles of argon ion sputtering and annealing in vacuum, (1 × 4)- and (1 × 5)-reconstructed terraces appeared. In addition to the terraces, the sputter-anne…
A new and straightforward protocol for pyrrole synthesis is developed by a unique one-pot combination of ring-closing metathesis and in situ oxidative aromatization by a quinone.
We have applied a ``real-reciprocal space analysis,'' using the continuous wavelet transform technique, to the experimental neutron and x-ray structure factors of silica glass to elucidate a correlation between the ``first sharp diffraction peak (FSDP)'' in reciprocal space and the corresponding length scale in real s…
The syntheses of modified nicotinic and picolinic acid by (3-aminopropyl)triethoxysilane and the preparation of their corresponding organic−inorganic molecular-based hybrid materials with the two components equipped with covalent bonds are described. The organic part is a derivative of heterocyclic compounds which is…
ADVERTISEMENT RETURN TO ISSUEPREVReportNEXTPreparation of Core−Shell-Type Aminomethyl Polystyrene Resin and Characterization of Its Functional Group DistributionTae-Kyung Lee, Sun-Jong Ryoo, Jang-Woong Byun, Sang-Myung Lee, and Yoon-Sik LeeView Author Information School of Chemical and Biological Engineering, Seoul Na…