Materials Literature
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Step by step: Bis(merocyanine) dyes 1 self-assemble in a stepwise manner with increasing concentration to afford supramolecular polymers, organogels, and liquid-crystalline phases. The close contacts between the chromophores within these superstructures enables strong D- and H-type excitonic coupling to be observed.
Abstract Polypropylene/montmorillonite nanocomposites (PPCN) were prepared by melt intercalation with maleic anhydride modified low isotactic polypropylene as the compatibilizer. The linear and nonlinear rheological properties of polypropylene/montmorillonite nanocomposites were studied. The deviation from linear beha…
As shown by Overhauser and others, the pair-distribution function $g(r)$ of a many-electron system may be found by solving a two-electron scattering problem with an effective screened electron-electron repulsion $V(r)$. We propose a simple physical picture in which this screened repulsion is the ``dressed-dressed'' in…
We investigate the occurrence of Hund's rule magnetism in C60(n+-) molecular ions, by computing the ground-state spin for all charge states n from -3 to +5. The two competing interactions, electron-vibration (e-v, including Jahn Teller, favoring low spin) and electron-electron (e-e, including Hund-rule exchange, favor…
A recent Letter reports photoemission data for the free C60 molecule, showing an interesting three-peak structure, presented as evidence of dynamic Jahn-Teller (DJT) effect in the C60+ ion. Those data constitute, along with earlier spectra by the Uppsala group, the best available piece of experimental evidence about t…
The short and intermediate range order of an amorphous Ge$_{30}$Se$_{70}$ alloy produced by Mechanical Alloying were studied by Reverse Monte Carlo simulations of its x-ray total structure factor, Raman scattering and differential scanning calorimetry. The simulations were used to compute the $G^{\text{RMC}}_{\text{Ge…
The hierarchical self-assembly of rationally designed synthetic peptides into beta-sheet tapes, ribbons, fibrils, and fibers opens up potentially useful routes to soft-solidlike materials such as hydrogels, organogels, or liquid crystals. Here, it is shown how incorporation of Glu (-CH(2)CH(2)COOH) or Orn (-CH(2)CH(2)…
Repulsion-induced order formation is shown to be crucial to the occurrence of the transition from rhombohedral boron nitride (rBN) to cubic boron nitride (cBN), by performing molecular dynamics simulations. Due to the repulsion among B (N), a face-centered-cubic (fcc) lattice of B (N) is formed under compression. This…
Field-induced phase transition from the antiferroelectric to the ferroelectric phase was studied by dielectric measurements in an antiferroelectric liquid crystal (AFLC) CS-4001. Two distinctive relaxation modes were found to contribute to the dielectric anomalies of the field-induced transition in the AFLC CS-4001.
M Watanabe, D B Williams; Improvements to Energy Resolution of an X-ray Energy Dispersive Spectrum by Deconvolution Using the Zero Strobe Peak, Microscopy
The phase diagram and elastic stiffness constants in Martensite alloys with the symmetry change from the cubic m\bar3m to the tetragonal 4/mmm and the orthorhombic mmm symmetries are discussed on the basis of the Landau-type free energy function expressed in terms of the strain components, u 1 , u 2 and u 3 . It was f…
The structures of a long-range-ordered physisorbed monolayer on a carbon nanotube are examined. Geometrical and energetical constraints determining the order of such monolayers are discussed. A number of symmetrically different, strongly bound adsorbate structures is found for Xe adsorbates, some of which differ very…
In this work, the piezoelectric ceramic system of Pb 0.96 Sr 0.04 [(Zr 0.74- x Ti x )(Mg 1/3 Nb 2/3 ) 0.20 (Zn 1/3 Nb 2/3 ) 0.06 ]O 3 , 0.3478≤ x ≤0.4218, with composition close to the morphotropic phase boundary, was studied. From the results of X-ray diffraction and piezoelectric measurement, ceramics near x =0.3774…
Effect of Ion Trapping Films on the Electrooptic Characteristics of Polymer-Stabilized Ferroelectric Liquid Crystal Display Exhibiting V-Shaped Switching, Furuichi, Keiji, Xu, Jun, Inoue, Masaru, Furuta, Hirokazu, Yoshida, Nobuaki, Tounai, Atsushi, Tanaka, Yoshiki, Mochizuki, Akihiro, Kobayashi, Shunsuke
Effects of alumina on the devitrification kinetics and mechanism of a low-dielectric K 2 O–CaO–SrO–BaO–B 2 O 3 –SiO 2 glass powder have been investigated. Crystalline phases including cristobalite (SiO 2 ) and pseudowollastonite [(Ca, Ba, Sr)SiO 3 ] are formed during the firing of the pure glass. With added alumina co…
The equilibrium swelling and phase behavior of the side chain liquid crystalline (LC) networks in isotropic (nonmesomorphic) solvents has been investigated as a function of temperature. The LC networks swollen in di- n -amyl phthalate or di- n -butyl phthalate exhibit discontinuous volume transition driven by nematic…
Electrochemical treatment of poly(tetrafluoroethylene) (PTFE) surfaces has been effected in localized areas of typical dimension of the order of 200 μm, leading to small regions of increased surface free energy. These have been studied by considering the wetting triple lines of tricresyl phosphate in the vicinity. Goo…
Image Pickup from Zinc Phthalocyanine/Bathocuproine Double-Layer Film Using Pickup Tube, Aihara, Satoshi, Miyakawa, Kazunori, Ohkawa, Yuji, Matsubara, Tomoki, Takahata, Tamotsu, Suzuki, Shiro, Egami, Norifumi, Saito, Nobuo, Tanioka, Kenkichi, Kamata, Norihiko, Terunuma, Daiyo
The effects of light-induced reorientation on a homeotropical dye-doped liquid crystal (DDLC) cell are discussed. The photoexcited azo dye Methyl Red (MR) is diffused and adsorbed onto the substrate, thus forming a ripple structure. The adsorbed dye and the laser-induced ripple structure then reorient the liquid-cryst…
We have investigated the crystal structures and magnetic properties of the α- and δ-phases of an organic radical p -NPNN ( p -nitrophenyl α-nitronyl nitroxide), which yielded the first organic bulk ferromagnet, β- p -NPNN (the β-phase). The results are compared with those of the β- and γ-phases, which show distinct ma…