Materials Literature
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A custom-designed, highly hydrophilic gelatin was produced in Pichia pastoris. Secreted production levels in single-copy transformants were in the range 3-6 g/l of clarified broth and purification to near homogeneity could be accomplished by differential ammonium sulfate precipitation. Despite the fact that gelatins a…
Grain growth and strain release processes in the electrodeposited nanocrystalline (nc) Cu specimen with a high purity were investigated by means of differential scanning calorimetry, x-ray diffraction, electrical resistance measurement, and high-resolution transmission electron microscopy. It was found that for the as…
Oak has been converted to a porous biocarbon template by annealing in an inert atmosphere above 800°C. Subsequent infiltration with gaseous SiO at 1550–1600°C under flowing argon of atmospheric pressure finally resulted in the formation of a porous, cellular β‐SiC ceramic. The conversion retains the biomorphic cellula…
The complementary 1,omega-thymine, 1,omega-adenine, and 1,omega-(thymine, adenine) bolaamphiphiles, [N,N'-bis[3-(2,4-dihydroxy-5-methylpyrimidine-1-yl)propionyl]1,n-diaminoalkane [T-n-T (n = 10, 11, 12)], N, N'-bis[3-(6-aminopurine-9-yl)propionyl]1,n-diaminoalkane [A-n-A (n = 10, 11, 12)], and N-[3-(2,4-dihydroxy-5-me…
Magnetite nanorods have been prepared by the sonication of aqueous iron(II)acetate in the presence of β-cyclodextrin. The properties of the magnetite nanorods were characterized by x-ray diffraction, Mössbauer spectroscopy, transmission electron microscopy, thermogravimetric analysis, and magnetization measurements. T…
A surface covered with a nanopatterned, regularly spaced array of SiO2 blocksis obtained by coating silica with a block copolymer, selectively removing one polymer from the layer, depositing SiO2 in the voids, and finally degrading the second polymer. The Figure shows an AFM image of a finished sample. Rough surfaces…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCyclodextrin-Mediated Soft Cutting of Single-Walled Carbon NanotubesJian Chen, Mark J. Dyer, and Min-Feng YuView Author Information Advanced Technologies Group Zyvex Corporation, 1321 North Plano Road Richardson, Texas 75081 Cite this: J. Am. Chem. Soc. 2001, 123, 25,…
The successful incorporation of an organic chromophore with highly polarizable lead iodide chains in an organic–inorganic hybrid is revealed in this communication. The synthesis, structure, and preliminary studies of the linear and nonlinear optical (NLO) properties of the compound are divulged. The synergism exhibite…
Quantum-chemical calculations, incorporating both electron–phonon and electron–electron effects, are performed on two-chain model aggregates to assess the influence of interchain interactions on the nature of the singly charged species (polarons) in organic conjugated polymers. In symmetric cofacial dimers with fixed…
We have explored magnetic properties and structural characteristics of Fe/Pt multilayers after annealing at various temperatures in order to clarify the growth process of the ordered Fe–Pt phase in the Fe/Pt multilayer structures. It is found that rapid diffusion at Fe/Pt interface occurs at temperatures 275–325 °C an…
A series of mercaptopropyl-functionalized wormhole mesostructures, denoted MP-HMS, have been prepared through the S 0 I 0 assembly of alkylamine surfactants (S 0 ) and mixtures of 3-mercaptopropyltrimethoxysilane and tetraethyl orthosilicate as framework precursors (I 0 ). Unprecedented levels of organo functionalizat…
coated with 2-carboxyterthiophene (TTP-COOH) self-assemble through π-π interactions to form uniform transparent microspheres. The interaction between individual particles is relatively weak and the spherical aggregates can be destroyed by sonication to leave the monodispersed nanoparticles.
The disposal of fission products and actinides generated by the nuclear-fuel cycle is one of the major challenges in Environ-mental Sciences of the 21st Century. Because some fission products (e.g., 99Tc, 129I, 79Se and 135Cs) and actinides (e.g., 239Pu and 237Np) are long-lived, they have a major impact on the risk a…
Growing carbon nanotubes (CNTs) by arcing from graphite electrodes does not demand a noble gas atmosphere: water will do! CO and H2 bubbles generated by reaction of C vapor with water provide a quasi-inert atmosphere in which multiwalled carbon nanotubes grow from the cathode. Using cobalt salt solutions instead of pl…
A unique nanoporous sol-gel glass possessing a highly ordered porous structure (with a pore size of 153 A in diameter) was examined for use as a support material for enzyme immobilization. A model enzyme, alpha-chymotrypsin, was efficiently bound onto the glass via a bifunctional ligand, trimethoxysilylpropanal, with…
On pyrrole! The pyrrole-based corrole ligands can offer an alternative to porphyrin systems. The manganese corroles 1-4 are readily synthesized, undergo metal- not ligand-based redox chemistry, and 4 in particular shows impressive catalytic activity in the oxygenation of styrene with iodosylbenzene.
In this work Ag underlayers, with a slightly larger unit cell than FePt, were found not only to induce epitaxial growth of the FePt films but also to reduce the FePt ordering temperature. Without using the Ag underlayer, the FePt film deposited onto the Si substrate was fcc disordered. By the use of the Ag underlayer,…
Detection of explosives has the flavor of those mathematical problems that are not invertible. It is easier to hide explosives than to find them. Many approaches have been proposed and executed for the remote detection of explosives, contraband materials, weapons of mass destruction, currency, etc. Most detection tech…