Materials Literature
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We report the observation of stimulated emission and mirrorless lasing in pure cholesteric liquid crystals. The lasing action is attributed to the combination of the fluorescence and the distributed feedback that are due to the inherent periodic structure of the liquid crystal. If the reflection band matches the intri…
A structural study of complexes formed between a dimeric zinc porphyrin tweezer (host) and chiral monoalcohols and monoamines derivatized by a bidentate carrier molecule (guest) confirmed that their CD couplets arise from the preferred porphyrin helicity of 1:1 host-guest complexes. NMR experiments and molecular model…
This paper presents a technique for reconstructing converter line currents using the information from a single current sensor in the DC link of a converter and comparative evaluation of the performance of single sensor control techniques in the DC link for voltage-source pulsewidth modulation (V-S PWM) converters. Whe…
Fungal degradation of poly(L-lactide) (PLA) was studied using Tritirachium album ATCC 22563. In liquid culture using basal medium and PLA film, no film degradation was observed. However, by the addition of 0.1% gelatin, about 76% of the PLA film was degraded after 14 days of cultivation at 30°C. Furthermore, the cultu…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTMolecular Machines Special IssueCite this: Acc. Chem. Res. 2001, 34, 6, 409Publication Date (Web):June 19, 2001Publication History Published online19 June 2001Published inissue 1 June 2001https://doi.org/10.1021/ar0100881Copyright © 2001 American Chemical SocietyRequest reuse pe…
Poly(propylene)s prepared using MgCl2-supported catalysts containing different electron donors have been characterized using temperature rising elution fractionation (TREF), gel permeation chromatography (GPC) and 13C NMR analysis. In addition, the regio- and stereochemical composition of oligomeric fractions present…
By elaborate adjustment of synthesis conditions, cubic (Pm3̄n) SBA-1 samples with well-defined crystal morphologies of a large number of facets have been synthesized, which are supposed to be obtained as a result of highly isotropic crystal growth under the conditions near thermodynamic equilibrium. The high-resolutio…
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…