Materials Literature
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The crystal structure of form II of isotactic poly(4-methyl-1-pentene) is presented. Samples of isotactic poly(4-methyl-1-pentene) in the pure form II have been obtained by crystallization from tetramethyltin solutions. The crystal structure has been determined by using X-ray powder diffraction data and packing energy…
The band gap, the single-particle energy, and the effective mass are calculated for semiconducting carbon nanotubes in a random-phase approximation within a k · p scheme. The energy gaps are shown to be strongly enhanced due to the Coulomb interaction, while effects on the effective mass along the axis direction are s…
The linear electrooptic coefficients of Pb(Mg 1/3 Nb 2/3 )O 3 –PbTiO 3 (PMN–PT) single crystals in the rhombohedral and tetragonal phases were characterized at a wavelength of 632.8 nm. Large electrooptic responses were observed. The tetragonal 0.62PMN–0.38PT single crystals poled along the <001> direction (the sponta…
The influence of molecular mass on the formation of polyelectrolyte multilayers on an oppositely charged surface of a rotating substrate was explored for a combination of strong cationic and anionic polyelectrolytes, such as poly(1-( N -benzylpyridinio-2-yl)ethylene bromide) (PVP-2B) and ι-carrageenan. UV/visible spec…
Abstract Different proportions of starch were blended with poly(β‐hydroxybutyrate)‐ co ‐poly(β‐hydroxyvalerate) (PHB‐V) or poly(ε‐caprolactone) (PCL) by extrusion, and the mechanical (maximum tensile strength, elongation at break and Young's modulus) and thermal properties (by differential scanning calorimetry) were d…
High-quality double-walled carbon nanotube (DWNT) super bundles were selectively grown above a bowl-like cathode by arc discharge in a hydrogen-free atmosphere. These DWNTs can resist high-temperature (up to 720 °C) oxidation in air without additional annealing even after acid treatment, which is due to an in-situ def…
The remarkable feature of electroplated film was grain growth at room temperature and this phenomenon was named `self-annealing'. The driving force of self-annealing was expected as highly increased defect and surface energy, but the exact mechanism was unknown. In this work, residual stress effect on self-annealing w…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTParacrystalline Lattice Distortion in the Near-Surface Region of Melt-Crystallized Polyethylene Films Evaluated by Synchrotron-Sourced Grazing-Incidence X-ray DiffractionHirohiko Yakabe, Sono Sasaki, Osami Sakata, Atsushi Takahara,…
Abstract Regenerated cellulose (RC) films were plasticized with glycerol, glycerin α‐monobutyrate, glycerin α‐monocaproate, glycerin α‐monocaprylate, and glycerin α‐monocaprate. The structure and properties of the films were investigated by using Fourier transform IR, wide‐angle X‐ray diffraction, differential scannin…
Abstract The synthesis of novel tetraphenylethenes 9a − f , 13 , and 18a , b bearing ether, biphenyl, and 4‐cyanobiphenyl moieties via a McMurry reaction and Suzuki coupling as key steps is described. Mesogenic properties of these compounds were studied by differential scanning calorimetry (DSC), optical polarizing mi…
A remarkable change in the conductivity of a polyaniline (PAN) Langmuir monolayer in the conducting state, as a function of surface pressure, has been observed using scanning electrochemical microscopy (SECM). The film conductivity, as expressed by the SECM current response of a redox mediator, was measured in-situ in…
The tetradentate imino-carboxylate ligand [L](2)(-) chelates the equatorial sites of Ni(II) to give the complex [Ni(L)(MeOH)(2)] in which a Ni(II) center is bound in an octahedral coordination environment with MeOH ligands occupying the axial sites. Lanthanide (Ln) and Group II metal ions (M) template the aggregation…
Abstract An increase in the depolymerization of chitosan was found with an increased concentration of sodium perborate. Acetic anhydride was added to reacetylated chitosan in a molar ratio per gulcosamine unit, and the amide I band of IR spectra changed with the addition of acetic anhydride. Sixteen chitosans with var…
Presented are results of our ab initio study of the structural relaxation of diamond nanowires, with dodecahedral and cubododecahedral morphology, showing that the energetic and structural stability of a diamond nanowire is dependent on both the surface morphology and the crystallographic direction of the principal ax…
X-ray diffraction (XRD) patterns of hydroxyfluorapatites with a nominal composition of Ca 10 (PO 4 ) 6 (OH) 2 - x F x, where x = 0.0, 0.4, 0.8, 1.2, 1.6, and 2.0, were collected and analyzed using the Rietveld method. A multiphase Rietveld analysis performed on calcined samples reveals a range of Ca/P ratios from 1.56…
The alignment of diblock copolymer microdomains by an electric field depends on the segmental interaction between two blocks and the difference in the interfacial energies of each block with the substrate. Morphologies having mixed orientations are predicted when the difference in the interfacial energies of the two b…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTObservation of Perpendicular Orientation in Symmetric Diblock Copolymer Thin Films on Rough SubstratesE. Sivaniah, Y. Hayashi, M. Iino, T. Hashimoto, and K. FukunagaView Author Information Department of Polymer Chemistry, Graduate S…
We report here a method that can be used to easily prepare bulk quantities of solubilized carbon nanotubes. The method is derived from Haddon's method in which we have modified the separation process by using two Soxhlet extractors in the procedure. Both primary and secondary amines could be used as starting materials…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNature of Strain-Induced Structures in Natural and Synthetic Rubbers under StretchingShigeyuki Toki and Benjamin S. HsiaoView Author Information Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New…
In situ surface plasmon resonance (SPR) and quartz crystal microbalance (QCM) measurements have been employed to measure the adsorption kinetics and absolute adsorbed amount of the poly( N -isopropyl acrylamide) (pNIPAM) from bulk aqueous solution onto a hydrophobized gold substrate. The adsorption was carried out at…