Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of size and morphology of soot aggregates as determined by light scattering and electron microscope analysisJ. Cai, N. Lu, and C. M. SorensenCite this: Langmuir 1993, 9, 11, 2861–2867Publication Date (Print):November 1, 1993Publication History Published online1 Ma…
A radiolytic push pull reduction method for the preparation of reasonably monodisperse silver particles 7.0 nm in diameter in aqueous solution is described. Slow particle growth is achieved in this method by simultaneously reducing Ag ions and partially oxidizing Ag n particles. The absorption spectrum of the particle…
Reversibility is the salient feature of the photochemical solid-state reaction of 1 to 2. Prerequisites, however, are first that the compound is irradiated into the long-wavelength flank of the absorption band of the chromophore (λ = 570 nm), and second that the product is not recrystallized before the thermal reverse…
Steric interactions of the substituents weaken the strong NH … N hydrogen bonds (typical for porphycenes) in 1 (R = Me, Et) by increasing the N … N distance. As a consequence the coordination of metal ions, in particular of Zn2+ ions, is facilitated. These findings can be expected to give impetus to the research into…
The reflection of light from a medium with ordered spin structure characterized by the breakdown of time-reversal and parity symmetry is expected to be non-reciprocal even if the net magnetic moment of the medium equals zero. We report on the first experimental observation of spontaneous non-reciprocal rotation and ci…
The question of whether the Kramers-Kronig relationships place severe limitations on the bandwidths that can be achieved in homogeneous microwave absorbing materials is addressed. An attempt is made to determine, by computer simulation, the best bandwidths theoretically achievable for homogeneous coatings of one parti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTime-resolved fluorescence of a new europium-chelate complex: demonstration of highly sensitive detection of protein and DNA samplesAshis K. Saha, Kathryn Kross, Edmond D. Kloszewski, Donald A. Upson, John L. Toner, Robert A. Snow, Chrostpher D. V. Black, and Vinay C. DesaiC…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of organic substrates by a molecular oxygen/aldehyde/heteropolyoxometalate systemMasatoshi Hamamoto, Kouichi Nakayama, Yutaka Nishiyama, and Yasutaka IshiiCite this: J. Org. Chem. 1993, 58, 23, 6421–6425Publication Date (Print):November 1, 1993Publication History P…
Polymers used in implantable devices, although relatively unreactive, may degrade in vivo through unknown mechanisms. For example, polyetherurethane elastomers used as cardiac pacemaker lead insulation have developed surface defects after implantation. This phenomenon, termed "environmental stress cracking," requires…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new surface oxygen complex on carbon: toward a unified mechanism for carbon gasification reactionsS. G. Chen, R. T. Yang, F. Kapteijn, and J. A. MoulijnCite this: Ind. Eng. Chem. Res. 1993, 32, 11, 2835–2840Publication Date (Print):November 1, 1993Publication History Publi…
To examine the role of organic constituents in the destruction of calcium carbonate skeletons, we aged fresh shells of the bivalves Nucula sulcata (organic-rich nacreous aragonites with low crystallite surface areas) and Cerastoderma edule (organic-poor porcellaneous aragonites, high crystallite surface areas) under b…
This article summarizes the characteristics of Honeywell's two-dimensional (2-D) arrays of micromachined microbolometers, discusses practical methods of operating these arrays in high-sensitivity room-temperature infrared (IR) imaging systems, and describes recent performance measurements.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of chiral symmetry breaking in crystallizationDilip K. Kondepudi, Kim L. Bullock, Jennifer A. Digits, John K. Hall, and Jason M. MillerCite this: J. Am. Chem. Soc. 1993, 115, 22, 10211–10216Publication Date (Print):November 1, 1993Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsotropic-nematic phase separation of a dispersion of organophilic boehmite rodsP. A. Buining and H. N. W. LekkerkerkerCite this: J. Phys. Chem. 1993, 97, 44, 11510–11516Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue…
Strategies for the optimization of molecular second‐order nonlinearities have emerged over the past few years, but significant questions still remain. This review highlights recent conceptual advances in the field of nonlinear optical molecular materials, concentrating on design criteria for the molecules themselves,…
Long-wavelength density fluctuations are recorded by small-angle light scattering during the crystallization of hard colloidal spheres. Measured structure factors show approximate scaling with a peak at finite scattering vectors. The time dependences of the peak intensity and the wave vector clearly reveal two differe…
We measure the effect of dc-electric-field--temperature sequences on the finite-frequency dielectric constant \ensuremath{\varepsilon}(\ensuremath{\omega}), and the thermally stimulated depolarization current of single crystals of Pb (${\mathrm{Mg}}_{1/3}$${\mathrm{Nb}}_{2/3}$)${\mathrm{O}}_{3}$ (PMN). The results are…
Problems associated with manufacturing Si 3 N 4 /SiC‐whisker composites have been overcome by developing selfreinforced Si 3 N 4 with elongated β‐Si 3 N 4 grains formed in situ from oxynitride glass. This Si 3 N 4 –Y 2 O 3 –MgO–SiO 2 –CaO‐based material has a flexure strength >1000 MPa and fracture toughness >8…
An open question in the study of water concerns the shape of the liquid spinodal line in the phase diagram of water, a boundary which represents the limit of mechanical stability of the liquid state. It has been conjectured that the pressure of the liquid spinodal ${\mathit{P}}_{\mathit{s}}$(T) does not decrease monot…
Molecular engineering has allowed the control of the HOMO-LUMO gap energy in a family of conjugated polymers based on poly(p-phenylenevinylene) (PPV). Random copolymerization of 1 and 6 afforded precursor polymers 10 with two different leaving groups. Treatment under thermal conditions led to a partially conjugated po…