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Abstract Microllular plastics are cellular polymers characterized by cell densities greater than 10 9 cells/cm 3 and cells smaller than 10 μm. One of the critical steps in the continuous production of microcellular plastics is the promotion of high cell nucleation rates in a flowing polymer matrix. These high nucleati…
We have studied resistivity, magnetization, and magnetoresistance in polycrystalline ${\mathrm{La}}_{0.67}$${\mathrm{Ba}}_{0.33}$${\mathrm{MnO}}_{\mathit{z}}$ by reducing the oxygen stoichiometry from z=2.99 to 2.80. As the oxygen content decreases, the resistivity of ${\mathrm{La}}_{0.67}$${\mathrm{Ba}}_{0.33}$ ${\ma…
Gram‐quantities of pure carbon nanotubes (see Figure) can be produced using a new method reported here. The nanotubes, which can be thought of as cylindrical graphitic microcrystals, are opened and purified by treating them with a mixtue of sulfuric acid and potassium permanganate. The opening of the nanotubes on a la…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCamphorsulfonic Acid Fully Doped Polyaniline Emeraldine Salt: Conformations in Different Solvents Studied by an Ultraviolet/Visible/Near-Infrared Spectroscopic MethodYounan Xia, Joanna M. Wiesinger, Alan G. MacDiarmid, and Arthur J. EpsteinCite this: Chem. Mater. 1995, 7, 3,…
Phenomenologically, a primary dopant for a conducting polymer is a substance, a relatively small quantity of which drastically changes the electronic, optical, magnetic, and/or structural properties of the polymer and it is accompanied by a large increase in conductivity. De-doping results in a reversal of the newly-i…
Most previous theoretical investigations of gas bubble dynamics have assumed an uncontaminated gas–liquid interface. Recently, however, the potential importance of layers of surface active agents on bubble dynamics has been increasingly recognized. In this work it is assumed that a continuous layer of incompressible,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and Synthesis of Macrocyclic Ligands and Their Complexes of Lanthanides and ActinidesV. AlexanderCite this: Chem. Rev. 1995, 95, 2, 273–342Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March 1995https://pubs.ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotofunctions of Intercalation CompoundsMakoto Ogawa and Kazuyuki KurodaCite this: Chem. Rev. 1995, 95, 2, 399–438Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March 1995https://pubs.acs.org/doi/10.1021/cr00034a005ht…
Abstract The double cubic lattice method (DCLM) is an accurate and rapid approach for computing numerically molecular surface areas (such as the solvent accessible or van der Waals surface) and the volume and compactness of molecular assemblies and for generating dot surfaces. The algorithm has no special memory requi…
Abstract The molecular weight of polyester polyol plays an important role in controlling mechanical and dynamic mechanical properties of polyurethanes. Two systems are studied for evaluation of these properties. Since the properties of polyurethanes are derived from the properties of various constituents involved in t…
Abstract In‐line monitoring of monomer conversion is studied using a low‐frequency dielectric sensor during solution polymerization of methyl methacrylate in a laboratory‐scale batch reactor. It has been found that the induction period due to the presence of an inhibitor can be determined by the dielectric sensor to d…
Abstract Fracture behavior of polypropylene (PP)/ethylene–propylene–rubber (EPR) blends containing small crystal in elastomeric phase was investigated. Various ethylene‐α‐olefin co‐polymers (ECP) were used as crystal components and put into the elastomer phase of the blends. The crystallite size was controlled by chan…
Abstract A calorimetric study for estimating crosslinking densities of polydimethylsiloxane (PDMS) networks is presented. It involves the experimental determination of the heat capacities of the polymer with ( C ) and without ( C ) crosslinking. The theoretical basis of the method is described as well as the procedure…
Abstract The aim of this work is to extend an isotropic elastoplastic damage concept for ductile materials within a generalized micropolar continuum framework. The underlying motivation is on the one hand to model softening behaviour by damage evolution and on the other hand to regularize the impending loss of ellipti…
In this paper the specific properties of free clusters and the formation of new cluster-assembled materials using the low energy cluster beam deposition (LECBD) technique are discussed. Recent results obtained for free clusters are summarized with special attention to new observed structures. As for the specific struc…
The structure of a common batch of amorphous hydrogenated carbon samples (a-C:H) has been studied in detail using time of flight neutron diffraction, inelastic neutron scattering, NMR and molecular dynamics (MD) simulation. Supplementary work has included differential scanning calorimetry (DSC), infrared (IR) spectros…
Using a genuine organic ferromagnetic radical crystal (${\mathrm{C}}_{10}$${\mathrm{H}}_{10}$${\mathrm{N}}_{4}$SCl) which was synthesized recently, we experimentally examined the results of quantum statistics for a one-dimensional Heisenberg ferromagnet with spin $S=\frac{1}{2}$. The characteristic thermodynamical pro…
Visible luminescence from silicon nanostructures fabricated by using conventional lithographic and reactive ion etching techniques and final thinning by high temperature thermal oxidation was obtained at room temperature under 488 nm argon laser excitation. Highly anisotropic vertical silicon pillars with aspect ratio…
The recently discovered giant magneto-impedance (GMI) effect has been measured as a function of circular driving-field frequency and applied tensile stress on two near-zero-magnetostriction amorphous wires. The effect of different orientations of the induced magnetoelastic anisotropy has been verified, for the first t…
We have measured dark DC conductivity and time-of-flight (TOF) of carriers in self-supporting porous silicon films in the temperature range 298–480 K. The dark I-V curves show superlinear behavior with activation energies of 0.38–0.67 eV. The TOF measurements allowed us to evaluate the drift-length of non-equilibrium…