Materials Literature
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Allylamine plasma polymerization is reported as a method to surface-modify PTFE and to prepare substrates that promote layer-by-layer assembly of polyelectrolytes. Two conditions for the plasma polymerization that differ in radiofrequency power were studied. Both conditions (10 and 50 W) produce substrates that suppor…
Abstract Changes in the molecular structure of a highly ordered kaolinite, intercalated with urea and potassium acetate, have been studied using Raman microscopy. A new Raman band, attributed to the inner surface hydroxyl groups strongly hydrogen bound to the acetate, is observed at 3605 cm -1 for the potassium acetat…
Comamonas acidovorans YM1609 secreted a polyhydroxybutyrate (PHB) depolymerase into the culture supernatant when it was cultivated on poly(3-hydroxybutyrate) [P(3HB)] or poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [P(3HB-co-3HV)] as the sole carbon source. The PHB depolymerase was purified from culture supernatant of…
A new library of ionophoric p-tert-butylcalix[4]diquinones containing ester (1), primary, secondary, and tertiary amide (2-4), and crown ether (5) substituents has been synthesized by treatment of the respective 1,3-bis-substituted p-tert-butylcalix[4]arene with Tl(OCOCF(3))(3) in trifluoroacetic acid. The structures…
Other| December 01, 1997 Disorder among network-modifier cations in silicate glasses; new constraints from triple-quantum 17 O NMR J. F. Stebbins; J. F. Stebbins Stanford University, Department of Geological and Environmental Sciences, Stanford, CA, United States Search for other works by this author on: GSW Google Sc…
Abstract The synthesis and structural characterisation of two dinuclear iron(III) complexes are reported. The compounds of general structure [Fe 2 L ] [ 8 ; L 1 = dianion of 2,2′‐dicyano‐2,2′‐isophthaloyldi(isopropyldicarboxylate)] and [K ⊂ Fe 2 L ] + (PF 6 ) ‐ [ 10 ; L 2 = dianion of 1,1′‐(2,6‐pyridylene)bis‐1,3‐(4‐d…
A new approach for the study of grafted polyelectrolytes is investigated: monolayers at the air/water interface of block copolymers consisting of a liquid hydrophobic and a polyelectrolyte block. The lateral interactions between the molecules is extremely long-ranged; a lateral pressure can be measured, while the graf…
Dihydrodipicolinate reductase catalyzes the NAD(P)H-dependent reduction of the alpha,beta-unsaturated cyclic imine dihydrodipicolinate to form the cyclic imine tetrahydrodipicolinate. The enzyme is a component of the biosynthetic pathway that leads to diaminopimelate and lysine in bacteria and higher plants. Because t…
We have identified low-energy structures of silicon clusters with 9 to 14 atoms using a nonorthogonal tight-binding method (TB) based on density-functional theory (DF). We have further investigated the resulting structures with an accurate all-electron first-principles technique. The results for cohesive energies, clu…
The planar aromatic tridentate ligand 2,6-bis(1-methylbenzimidazol-2-yl)pyridine (L(1)) reacts with Ln(III) (Ln = La-Lu) in acetonitrile to give the successive complexes [Ln(L(1))(n)()](3+) (n = 1-3). Stability constants determined by spectrophotometry and potentiometric competitive titrations with Ag(I) show that the…
This research demonstrated for the first time a method for producing net shape polymer, ceramic and carbon composites using wood as a precursor. The conversion of wood to carbon has been practiced for centuries but the controlled thermal decomposition to form a monolithic carbon to be used as a template for composites…
An ionene-type polycation incorporating a nonlinear optical chromophore was synthesized. It was employed for the assembly of alternating polyelectrolyte multilayers on charged and uncharged substrates, using different organic polyanions as well as montmorillonite clay as anionic counterparts. The assembly process was…
peer reviewed
A family of liquid crystalline organic semiconductors based on perylene-3,4,9,10-tetracarboxyldiimide is introduced. The thermal transitions, self-organizing behavior, and change in photophysical properties upon self-organization of one member of the family are described. Red, polycrystalline thin films of spin-coated…
The chain folding behavior of oxyethylene/oxybutylene (E/B) diblock copolymers, with one crystallizable E block and one noncrystallizable B block, has been studied by simultaneous SAXS and WAXS, low-frequency Raman spectroscopy, and differential scanning calorimetry. Two models, normal density (ND) and crystal/liquid-…
The depth distribution of Ge implanted into thermally grown SiO2 films has been studied after annealing using transmission electron microscopy, Rutherford backscattering spectrometry, and x-ray diffraction. At annealing temperatures above 900 °C a significant redistribution of the as-implanted Ge profile was found. Cr…
The three-dimensional network complex was prepared by engaging the multibinding terephthalate dianion and nonchelating 3(5)-methylpyrazole as bridge and end-capping ligand, respectively. The overall antiferromagnetism of the complex was explained in terms of blended magnetism of weak antiferromagnetic and ferromagneti…
Complexation of 3,4-dialkoxystilbazoles to Ag I has led to a new series of polycatenar, metal-containing liquid crystals. The complexes were found to show mainly cubic and columnar mesophases, although short-chain homologues showed a different behavior due to a dissociation of one ligand in the melt. On cooling from t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTConcentration Dependence of Aggregation of Polyaniline in NMP Solution and Properties of Resulting Cast FilmsW. Zheng, M. Angelopoulos, A. J. Epstein, and A. G. MacDiarmidView Author Information Department of Chemistry, University o…
A new strategy to create well-ordered latex particle monofilms from polydisperse latex solutions was developed. Due to size-dependent segregation, the spherical particles assemble in grains with a uniform sphere size within each grain. The size-dependent segregation process can be deduced from the action of a single f…