Materials Literature
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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…
The salt [2,2‘-(1,4-phenylene)pyrimidine 2+ ][hexacyanocyclopropanediide 2- ] ([PBA 2+ ][C 6 (CN) 6 2- ]) ( 1 ) crystallized from organic solvents as two polymorphic forms through charge-assisted N−H···NC hydrogen bonding between the oppositely charged ions. The red polymorph ( 1R ) crystallized in the Fdd 2 space gro…
Mesoporous MCM-41 and Al-MCM-41 (Si/Al = 99 and 158) molecular sieves were synthesized hydrothermally and characterized by low-angle X-ray powder diffraction (XRD), nitrogen adsorption isotherms, FT-IR, and TG-DTA techniques. Monometallic manganese and cobalt oxides and also their bimetallic forms impregnated Si-MCM-4…
Large-area ZnO nanorod arrays have been synthesized successfully on a stainless steel grid at a mild growth temperature of around 400 degrees C. The as-grown ZnO nanorods have uniform diameters of about 30-50 nm with approximately 5 nm tips. Patterned growth can be realized by engineering the shape of the grid in the…
A new tetranuclear manganese(II) compound, [Mn4L6](ClO4)2 (L is the Schiff base derived from 2-pyridylaldehyde and 2-aminophenolate), has been synthesized and characterized structurally and magnetically. The compound is the first example of tetramanganese clusters with centered planar trigonal topology in which a cent…
Abstract We demonstrate bulk synthesis of single‐crystal Pb‐doped ZnO nanowires by using (Pb(NO 3 ) 2 + Zn) powders at 450 °C. These mass nanowires are characterized by X‐ray diffraction, scanning electron microscopy, energy dispersive X‐ray spectroscopy, transmission electron microscopy (TEM), selected area electron…
Wettability is one of the anisotropic surface properties of molecular crystals that exhibit the structural variance of chemical moieties on various growth faces. The divergence in liquid-solid interactions at different faces is thought to be related to the inherent responding capacity or sensitivity of a solid surface…
Laser-ablated beryllium atoms react with H2 upon co-condensation in excess hydrogen and neon to form BeH2 and (BeH2)2, which are identified through isotopic substitution and DFT calculations. Unreacted Be atoms isolated in solid neon or hydrogen are excited to the 1P0 state and react further with H2 to enhance the BeH…
X-ray photon correlation spectroscopy was used to characterize the wave-vector- and temperature-dependent dynamics of spontaneous thermal fluctuations in a vesicle (L4) phase that occurs in a blend of a symmetric poly(styrene-ethylene/butylene-styrene) triblock copolymer with a polystyrene homopolymer. Measurements of…