Materials Literature
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Abstract New thermosetting polymeric materials were prepared by the cationic copolymerization of corn oil or conjugated corn oil with styrene and divinylbenzene initiated by boron trifluoride diethyl etherate or related modified initiators. The gel times ranged from a few minutes to hours or even days depending on the…
The preparation and the properties of several ruthenium complexes of the general formula cis-RuL(2)X(2) with L = 2,2'-bipyridine-4,4'-bisphosphonic acid, L' = 2,2'-bipyridine-5,5'-bisphosphonic acid, and X = Cl, CN, or NCS are reported. The synthesis of these complexes relies on the preparation of the key intermediate…
The synthesis, photophysical and nonlinear optical properties of several new multi-octupolar tris(bipyridine) ruthenium complexes are reported. The preparation on these complexes is based on the initial construction of multipodal 4,4'-dialkylaminostyryl-2,2'-bipyridine ligands (DAAS-bpy). Thermally stable polyimides f…
Palladium-catalyzed polycondensation between 2,5-dibromo-4-alkylthiazoles (alkyl = butyl thorough nonyl) and 2,5-bis(trimethylstannyl)thiophene gave charge-transferred-type alternating polymers, PTz(R)Th's. PTz(R)Th's had a high regioregularity as judged from their 1 H NMR and X-ray diffraction (XRD) data, and the hea…
59Co NMR measurements on La1-xSrxCoO3 reported here establish unequivocally, for the first time, the coexistence of ferromagnetic regions, spin-glass regions, and hole-poor low spin regions at all x values from 0.1 to 0.5. A zero external field NMR spectrum, which is assigned to the ferromagnetic regions, has a spectr…
A nanosized octadecaheteronuclear aggregate, [[NiL(2)](12)[Nb(CN)(8)](6)(H(2)O)(6)], and a 1-D coordination polymer, [[MnL(1)](2)[Nb(CN)(8)](H(2)O)]( infinity ), have been obtained by self-assembly between the octacyanometalate [Nb(CN)(8)](4)(-) and [ML](2+) complexes. The dimensionality of the supramolecular architec…
Growth of single crystal beta carbon nitride ( β ‐C 3 N 4 ) nanorods (see Figure) has been achieved for the first time through thermal annealing of nanosized carbon nitrides induced by high‐energy ball milling under a streaming flow of NH 3 . Most of the nanorods grow along the [001] direction, and the surfaces are de…
Surface modification of citrate-reduced gold nanoparticles with 2-mercaptosuccinic acid (MSA) was carried out in the aqueous phase. This provides a way to obtain carboxylic acid functionalized gold nanoparticles with diameter above 10 nm. The influence of the protecting MSA layer on the behavior of the modified gold n…
The charge inversion phenomenon is studied by molecular dynamics simulations, focusing on size and valence asymmetric salts, and a threshold of surface charge density for charge inversion. The charge inversion criteria by the electrophoretic mobility and the radial distribution functions of ions coincide except around…
We analyze the influence of a glass transition gradient near the particle surfaces on the nonlinear mechanical behavior of reinforced elastomers. We studied systems consisting of grafted silica particles dispersed in a cross-linked poly(ethyl acrylate) matrix. Both particle/matrix interfaces and dispersion states of t…
Properties of a Nuclear-Spin-Polarization-Induced Quantum Ring (NSPI QR) are studied theoretically. In the proposed system a local nuclear spin polarization creates an effective hyperfine field which confines the electrons with the spins opposite to the hyperfine field to the regions of maximal nuclear spin polarizati…
We carry out finite-difference time-domain simulations, with a specially designed boundary condition, on pure evanescent waves interacting with a lossy left-handed material (LHM) slab. Our results provide the full-wave numerical evidence for the amplification of evanescent waves inside a LHM slab of finite absorption.…
Periodic (CASTEP and DMol 3 ) and cluster (Gaussian 98 and DMol 3 ) ab initio calculations were carried out to develop force field parameters for the system Ti−O−H to model TiO 2 −H 2 O interfaces. A force field was derived from previously existing force fields for bulk TiO 2 polymorphs (Matsui, M.; Akaogi, M. Mol. Si…
We report on a unique, very simple method of preparation of reactive membranes and nanotemplates with nanoscopic cylindrical channels on the surface of various inorganic and polymeric substrates. Well-ordered nanostructured thin polymer films have been fabricated from the supramolecular assembly of poly(styrene-block-…
Our research is concerned with the application of femtosecond time-resolved absorption techniques to the study of the photophysics of transition metal complexes. The focus is to understand the events that characterize the process of excited-state evolution from the time a photon is absorbed by a molecule to the format…
Abstract Acetyl tri‐ n ‐butyl citrate (ATBC) and poly(ethyleneglycol)s (PEGs) with different molecular weights (from 400 to 10000) were used in this study to plasticize poly(L‐lactic acid) (PLA). The thermal and mechanical properties of the plasticized polymer are reported. Both ATBC and PEG are effective in lowering…
Silicon nitride (SiN) films were prepared using 1,1,1,3,3,3-Hexamethyldisilazane (HMDS) instead of monosilane (SiH 4 ) by the cathode coupled plasma enhanced chemical vapor deposition (PE-CVD). As HMDS and NH 3 were used, SiN film prepared at RF power of 300 W shows high insulation performance, breakdown voltage of wh…
The doping effect of paramagnetic organic radical impurities ( p -CyDTV) on the organic spin–Peiels (SP) system of p -CyDOV (3-(4-cyanophenyl)-1,5-dimethyl-6-oxoverdazyl; the SP transition temperature T SP =15.0 K) was studied by the heat capacity measurement down to 0.1 K. At low temperatures below 1 K, quite a sharp…
Zincblende ZnMgCdS quaternary alloy layers were grown by molecular-beam epitaxy. The ZnMgCdS alloy lattice matched with GaAs and exhibited the band-gap energy of approximately 3 eV. Zn, Mg, and CdS were used as source materials. Cd was replaced by Zn or Mg, and the alloy composition was controlled when the growth temp…
Control of Birefringence Dispersion of Uniaxially Oriented Poly(2,6-dimethyl 1,4-phenylene oxide)/Atactic Polystyrene Blend Films by Changing the Stretching Parameters, Uchiyama, Akihiko, Yatabe, Toshiaki