Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStereoselective Ring-Opening Polymerization of meso-Lactide: Synthesis of Syndiotactic Poly(lactic acid)Tina M. Ovitt and Geoffrey W. CoatesView Author Information Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University Ithaca, New York 14853…
The specific heat and thermal conductivity of millimeter-long aligned carbon multiwall nanotubes (MWNT's) have been measured. As a rolled-up version of graphene sheets, a MWNT of a few tens nm diameter is found to demonstrate a strikingly linear temperature-dependent specific heat over the entire temperature range mea…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNanocages Derived from Shell Cross-Linked Micelle TemplatesHaiyong Huang, Edward E. Remsen, Tomasz Kowalewski, and Karen L. WooleyView Author Information Department of Chemistry, Washington University One Brookings Drive, St. Louis, Missouri 63130 Monsanto Company, 800…
As an expansion to the wet chemical route for the preparation of quantum-sized II−VI semiconductor materials, a series of thiol-capped crystalline CdSe nanoparticles has been synthesized in aqueous solution using mercapto- alcohols (2-mercaptoethanol, 1-thioglycerol), and mercapto acids (thioglycolic acid, thiolactic…
We have studied the transport properties in a family of pure and doped intermetallics of the form MNiSi (M=Zr, Hf), the structures known as the half-Heusler alloys. We have shown that the transport is very sensitive to structural arrangements of the constituent atoms, and this can be manipulated by annealing, isostruc…
The electroanalytical behavior of thin electrodes is elucidated by the simultaneous application of three electroanalytical techniques: slow‐scan‐rate cyclic voltammetry (SSCV), potentiostatic intermittent titration technique, and electrochemical impedance spectroscopy. The data were treated within the framework of a s…
A unique combination of a clearly defined particle structure and a very highly functionalized surface is offered by the topical dendrimers. Many groups work on this unusual molecular architecture to develop new applications. The most advanced progress in this respect is an MRI contrast agent based on dendrimers (see s…
Anisotropic line-shape broadening (peak width which is not a smooth function of d -spacing) is frequently observed in powder diffraction patterns, and can be a source of considerable difficulty for whole-pattern fitting or Rietveld analysis. A model of the multi-dimensional distribution of lattice metrics within a pow…
Gold nanorods with different aspect ratios are prepared in micelles by the electrochemical method and their absorption spectra are modeled by theory. Experimentally, a linear relationship is found between the absorption maximum of the longitudinal plasmon resonance and the mean aspect ratio as determined from TEM. It…
MOTIVATION: The program ESPript (Easy Sequencing in PostScript) allows the rapid visualization, via PostScript output, of sequences aligned with popular programs such as CLUSTAL-W or GCG PILEUP. It can read secondary structure files (such as that created by the program DSSP) to produce a synthesis of both sequence and…
Obtaining an electron-density map from X-ray diffraction data can be difficult and time-consuming even after the data have been collected, largely because MIR and MAD structure determinations currently require many subjective evaluations of the qualities of trial heavy-atom partial structures before a correct heavy-at…
Microalgal biovolume is commonly calculated to assess the relative abundance (as biomass or carbon) of co‐occurring algae varying in shape and/or size. However, a standardized set of equations for biovolume calculations from microscopically measured linear dimensions that includes the entire range of microalgal shapes…
Ferroelectric ceramics were born in the early 1940s with the discovery of the phenomenon of ferroelectricity as the source of the unusually high dielectric constant in ceramic barium titanate capacitors. Since that time, they have been the heart and soul of several multibillion dollar industries, ranging from high‐die…
M. G. M. de Souza, H. Moreira-Filho, Diatoms (Bacillariophyceae) of Two Aquatic Macrophyte Banks from Lagoa Bonita, Distrito Federal, Brazil, I: Thalassiosiraceae and Eunotiaceae, Bulletin du Jardin botanique National de Belgique / Bulletin van de Nationale Plantentuin van België, Vol. 67, No. 1/4 (Mar. 31, 1999), pp.…
Detailed studies of formation, structure, and luminescence characteristics of novel ionically linked sinusoidal chains of [{Na}{(sal)(3)Ln(B(OCH(3))(4))Ln(sal)(3)}](n)() [Ln = Nd, Sm, Tb-Lu, Y (4); Ln = Eu (5); Ln = Gd (6)] was undertaken to assess the versatility of tetramethoxyborate anions as consistent general syn…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSalt-Induced Switching of Microdomain Morphology of Ionically Functionalized Diblock CopolymersMatthias Schöps, Heike Leist, Alexander DuChesne, and Ulrich WiesnerView Author Information Max-Planck-Institut für Polymerforschung, Pos…
An alternative approach, based on simple acid−base hydrolytic chemistry, to prepare organic−inorganic composites is reported. In these hybrid materials, NLO-active chromophores such as Disperse Red 19, a pyridinium salt based dye, and 1-amino-4-nitrobenzene are covalently locked into silica networks. The resulting hyb…
Spherical and cylindrical adaptive liquid-crystal lenses are proposed. The modal principle of control of the distribution of the refractive index over the aperture is used in these lenses. This control is achieved by introducing an additional high-resistance electrode and placing low-resistance contacts at the periphe…
The facile, high-yielding synthesis of a series of macrocycles 7a-k in 75-100% yield is reported. The transformation of these compounds to their carboxymethylated analogues 8a-k in 75-90% yield and subsequent gadolinium complexes 9a-k provides a series of homologous neutral paramagnetic contrast agents (PCAs) with tun…
Isothermal desorption kinetics at different temperatures of 1,2-dichloroethane (DCE) from syndiotactic polystyrene films have been studied by Fourier transform infrared spectroscopy. For β-form films, where DCE is present only into the amorphous phase, nearly equal populations of trans and gauche conformers, during th…