Materials Literature
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Abstract Blend films of silk fibrion (SF) and poly(vinyl alcohol) (PVA), with glycerin as an additive, were made, and the structure and properties of the blends were investigated by scanning electron microscopy (SEM), Fourier transform infrared (FT‐IR) spectroscopy, differential scanning calorimetry (DSC), and wide‐an…
The effects of hydrogen on the ground-state electronic and magnetic structures of ${\mathrm{AB}}_{2}$ (A=Zr; $B=\mathrm{V},$ Cr, Mn, Fe, Co, Ni) Laves phase compounds were investigated by first-principles local-density-functional calculations. We calculated the relative stability of atomic hydrogen at various intersti…
Abstract A triamine monomer, 1,3,5‐tris(4‐aminophenoxy)benzene (TAPOB), was synthesized from phloroglucinol and 4‐chloronitrobenzene, and it was successfully polymerized into soluble hyperbranched polyimides (HB PIs) with commercially available dianhydrides: 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride (6FDA),…
Structural relaxation of fragile glass-forming liquids in the vicinity of the glass transition were measured by dielectric spectroscopy, as a function of temperature and pressure. From the volume dependence of the relaxation times, we show that the effects of thermal and free volume fluctuations are comparable. The im…
Exfoliated K4Nb6O17 bilayer nanosheets in extraordinarily large size (ca. 100 microns) were prepared by the direct reaction of K4Nb6O17.3H2O crystals with an aqueous solution of propylamine; the size was extremely larger than that of exfoliated nanosheets (several microns) reported previously.
A theoretical comparative study of complexes of porphyrin (P), porphyrazine (Pz), and phthalocyanine (Pc) with metal (M) = Fe, Co, Ni, Cu, and Zn has been carried out using a DFT method. The calculations provide a clear elucidation of the ground states for the MP/Pz/Pc molecules and for a series of [MP/Pz/Pc](x-) and…
The optical and photophysical properties of phenylacetylene dendritic macromolecules based on unsymmetrical branching are investigated using steady-state and time-dependent spectroscopy. Monodendrons, up to the fourth generation, are characterized with and without a fluorescent perylene trap at the core. The higher ge…
We performed in situ transport measurements in a transmission-electron microscope (TEM) on individual double-walled carbon nanotubes (DWNT). Using selected-area electron diffraction, the chiral indices of the two tubes constituting the DWNTs were determined through careful comparison with theory. We discuss the case o…
A laser with an active volume consisting of only a single quantum wire in the 1-dimensional (1-D) ground state is demonstrated. The single wire is formed quantum-mechanically at the T-intersection of a 14 nm Al_{0.07}Ga_{0.93}As quantum well and a 6 nm GaAs quantum well, and is embedded in a 1-D single-mode optical wa…
We study the third-order nonlinear optical susceptibility $χ^{(3)}$ and photoexcited states of two-dimensional (2D) Mott insulators by using an effective model in the strong-coupling limit of a half-filled Hubbard model. In the numerically exact diagonalization calculations on finite-size clusters, we find that the co…
In this communication, we experimentally report, for the first time, that the MnO nanoclusters with cluster diameters of 5-10 nm show a ferromagnetic behavior with a phase transition from ferromagnetic to paramagnetic phases at 27 K even though their bulk phase is antiferromagnetic. We observed large coercivities up t…
A method is introduced to analyze the degeneracy properties of the band structure of a photonic crystal making use of the super cells. The band structure associated with a super cell of a photonic crystal has degeneracies at the edge of the Brillouin zone if the photonic crystal has some kind of point group symmetry.…
The behavior of bcc Mo and Nb under large strain was investigated using the ab initio pseudopotential density-functional method. We calculated the ideal shear strength for the ${211}〈111〉$ and ${011}〈111〉$ slip systems and the ideal tensile strength in the $〈100〉$ direction, which are believed to provide the minimum s…
Ligand-stabilised, water-soluble gold nanoparticles of two different size ranges (2-4 and 5-8 nm) are readily prepared using monohydroxy (1-mercaptoundec-11-yl) tetraethylene glycol as a novel capping agent. These nanoparticles are as stable as alkylthiol-capped monolayer protected clusters (MPCs) and do not aggregate…
We demonstrate that significant improvements in kinetics of co-crystal formation by grinding can be achieved by the addition of minor amounts of appropriate solvent.
Amino groups were covalently introduced onto a polycaprolactone (PCL) surface by the reaction between 1,6-hexanediamine and the ester groups of PCL. The occurrence of the aminolysis and the introduction of free NH(2) groups were verified qualitatively by fluorescence spectroscopy, where rhodamine B isothiocyanate was…
Stabilized zirconia in nanoparticles in c-ZrO2 polymorph has been synthesized with a small quantity of (5 mol%) additive of Cr3+ and Cr4+ cations by thermomechanical attrition (MA) process. The MA process allows the chromium cations to dissolve in the precursor in an amorphous state in order to obtain a stabilized pha…
Absorption, desorption and swelling behavior of polymers \nplay important roles in polymer processing and performance, ranging from issues of dimensional stability \nand permeability to controlling adhesion. Rich, nonlinear \nphenomena are associated with transient swelling and drying of glassy and semicry…
We report on the conformational properties and transitions of an ideal polymer chain near a solid surface. The chain is tethered with one of its ends at distance z(0) from an adsorbing surface. The surface is characterized by an adsorption parameter c. The exact expression for the partition function is available. We o…
Abstract The shape and size dependence of the anti‐reflective and light‐diffusing properties of surfaces with linear periodic grooves is studied. Grooves of triangular or rectangular cross‐sections on the front or back surface of a crystalline silicon layer are considered. Our method is an extension of the rigorous, t…