Materials Literature
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We consider here small-length-scale crystal structures with two clearly different molecular components (e.g., hydrophobic and hydrophilic). Using a perspective developed by studies on large-length-scale block copolymers and liquid crystals, we focus on the crystalline interface between the two components. We examine f…
Electrooxidation of tetrathiafulvalene (TTF) carried out in the presence of (Bu4N)2TTF(CO2H)2(CO2)2 as supporting electrolyte affords wholly TTF organic materials in which TTF cations are associated with TTF(CO2H)2(CO2−)2 as counteranions.
We describe a method that explains the morphology of needle-shaped crystals by analyzing the growth mechanisms for the various crystal faces, the relevant parameter being the edge free energy of a two-dimensional nucleus on a surface. As an example, the crystal morphology of a β‘ triacylglycerol is chosen. The results…
Amine-terminated polyamidoamine (PAMAM) dendrimers can be immobilized onto anhydride-functionalized pulsed plasma polymer surfaces via amide linkage formation. The packing density of dendrimers at the surface can be tailored by programming the pulse duty cycle parameters during plasma polymerization. These PAMAM dendr…
L-Lactate dehydrogenase (LDH) from Lactobacillus pentosus is a non-allosteric enzyme, which shows, however, high sequence similarity to allosteric LDHs from certain bacteria. To elucidate the structural basis of the absence of allostery of L. pentosus LDH (LPLDH), we determined the crystal structure of LPLDH at 2.3 A…
We have investigated the attachment of recently developed poly(ethylene glycol)−poly( dl -lactic acid) (PEG−PLA) copolymeric micelles onto functionalized TiO 2 and Au. The attachment and immobilization of the micelles were investigated via X-ray photoelectron spectroscopy and reflection−absorption infrared spectroscop…
We describe the growth of magnetic nanostructures on carbon nanotube templates. The nanotubes were grown by microwave plasma enhanced chemical vapor deposition. The as-grown nanotubes were aligned reasonably well around the substrate normal directions. However, it was found that the nanotubes grown on magnetic catalys…
The early interdiffusion stages in epitaxially grown Ag/Au and Cu/Au reaction couples are investigated by high-resolution and Z-contrast electron microscopy. While the interdiffusion in the lattice-matched system Ag/Au follows Fick's diffusion laws from the very beginning, a complex two-stage reaction is observed in t…
We describe a constant-traction molecular dynamics method to perform simulations of a generic atomistic system under an applied external load. The main objective is to ensure consistency between the atomistic model and the macroscopic continuum-mechanics description. Examples of simulations for different kinds of exte…
The high relaxivity of [GdaDO3A]3− (r1p = 12.3 mM−1 s−1, 20 MHz, 298 K, τm = 30 ns) in water is maintained in serum solution because the binding of protein and endogeneous anions, e.g. HCO3−/CO32− is suppressed by electrostatic repulsion.
The photophysical properties of carbazole excimers were investigated using syn - and anti -[3.3](3,9)carbazolophanes: the syn -carbazolophane is a model compound for a fully overlapped carbazole excimer and the anti -carbazolophane for a partially overlapped carbazole excimer the structures of which have been determin…
Four bis(salicylaldiminato)zinc(II) complexes have been synthesized from four Schiff bases obtained by the condensation of chiral (R)-(+)-1-phenylethylamine with salicylaldehyde (1), 5-nitrosalicylaldehyde (2), 3,5-dichlorosalicylaldehyde (3) and 5-methoxysalicylaldehyde (4). The complexes crystallize in the noncentro…
Polyelectrolyte thin films composed of alternating layers were spin-assembled by sequentially dropping cationic and anionic aqueous solutions onto a spinning substrate. In this work, we show the applicability of our technique to multiple systems and present two methods for producing linear film growth. The polycations…
(LaO)CuS with a layered structure is a transparent p-type semiconductor (band $\mathrm{gap}=3.1\mathrm{eV}),$ which gives an excitonic absorption/emission near the band edge even at room temperature. We examined the electronic structure of this material by photoemission and inverse photoemission spectroscopy and consi…
Novel π-conjugated polymer-protected metal (M = Pd, Au, Pt) nanoparticles of narrow size distribution and high dispersity were prepared via reduction of the metal ions by a π-conjugated poly(dithiafulvene) (PDF) having strong electron-donating properties. The oxidized polymer protected the metal nanoparticles as stabl…
Colloidal gold nanoparticles can be isolated from excess citric acid buffer by electrolyte-induced precipitation from water solutions through the addition of oxyanions. This allows the nanomaterials to be isolated as freely soluble powders that can be readily redissolved in water or buffer solution for other applicati…
The use of inorganic salts during the synthesis of mesoporous materials with block copolymers can dramatically widen the syntheses domain (in temperature, surfactant concentration, etc.) and broaden the range of surfactants that can be utilized to produce highly ordered mesostructures.
Femtosecond time-resolved photoemission of photoexcited electrons in highly oriented pyrolytic graphite (HOPG) provides strong evidence for anisotropies of quasiparticle (QP) lifetimes. Indicative of such anisotropies is a pronounced anomaly in the energy dependence of QP lifetimes between 1.1 and 1.5 eV--the vicinity…
Using information from sequence alignments significantly improves protein secondary structure prediction. Typically, more divergent profiles yield better predictions. Recently, various groups have shown that accuracy can be improved significantly by using PSI-BLAST profiles to develop new prediction methods. Here, we…
Stable protein−clay films were fabricated by casting an aqueous dispersion of protein and clay on pyrolytic graphite electrodes. Myoglobin (Mb), hemoglobin (Hb), and horseradish peroxidase (HRP) in clay films gave a pair of well defined, quasi-reversible cyclic voltammetric peaks at about −0.28 V vs SCE in pH 5.5 buff…