Materials Literature
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Monte Carlo simulations and dynamic field theory are used to study spherical particles suspended in a nematic liquid crystal. Within these two approaches, we investigate the binding of the defects to the particles, the adsorption of a particle at a solid surface, and two particles interacting with each other. Quantita…
Polymer fiber interconnects were produced between microscale features on a substrate using only electrostatic forces. Electric-field-driven directed growth of nanoscale carboxymethylcellulose fibers was achieved between microscale droplets of a concentrated polymer solution. The fibers were studied using atomic force…
Solid solutions of V x Co 1– x [TCNE] 2 composition have been prepared from the reaction of V(CO) 6 and Co 2 (CO) 8 in dichloromethane. All magnetically order above 280 K for x > 0.05 and their coercivity increases with decreasing x , reaching a maximum of 270 Oe for x = 0.3 (see Figure). Hence, the magnetic proper…
Abstract A series of aryldiazenido compounds of the type ( n Bu 4 N) 3 [Mo 6 O 18 (N 2 Ar)] have been prepared by treatment of ( n Bu 4 N) 4 [Mo 8 O 26 ] with the appropriate arylhydrazines in acetonitrile or in methanol. All these compounds are isostructural. Two members of the series, the o ‐nitro and the p ‐carboxy…
This paper describes a new approach for analysis of residual dipolar couplings (RDCs). The method, which focuses on construction of the conformational distribution function, is applied to 4-n-pentyl-4′-cyanobiphenyl in the nematic phase. The RDCs are calculated from a trajectory generated in a molecular dynamics (MD)…
The tight-binding eigenstates of isolated finite-sized zigzag and armchair nanotubes are obtained analytically using the transfer matrix method. Edge states are encountered for zigzag tubes but not for armchair tubes. Inclusion of curvature leads to a decaying-oscillating behavior of the highest occupied and lowest un…
In our studies of Tg of amorphous forms of water, it had been ascertained that the observed endotherm had the characteristics of glass softening and not those of a sub-Tg peak, but an explicit discussion was not provided. To prevent this Tg-endotherm from being mistaken as part of a sub-Tg peak, we use our earlier dat…
Isotropic TbMn 6 Sn 6 was prepared by mechanical milling and subsequent annealing. Although the crystalline grain size was a little larger than 15 nm, no remanence enhancement resulting from intergrain exchange coupling was observed. The coercivity μ 0 H c = 0.96 T at 293 K was much larger than that expected from magn…
Abstract Poly(ethylene oxide) (PEO) of 4600 molar mass (PEO‐4600) was crystallized from methanol in the presence of hydrophilic fumed silicas (A380, A200, and OX50) with nominal surface areas of 380, 200, and 50 m 2 /g and a hydrophobic fumed silica (R812s) modified with methyl groups. The composites were characterize…
The effect of a sixth ligand in a series of low-spin thiocarbonyl-ligated iron(II)octaethylporphyrinates has been investigated. Six-coordinate complexes have been synthesized and characterized by Mössbauer and infrared spectroscopy and single-crystal X-ray structure determinations. The results are compared with the fi…
By the addition of chondroitin sulfate (Chs) to the aqueous suspension of tobacco mosaic virus (TMV), the aggregation of TMV occurs at very dilute TMV concentration compared with the addition of polyethylene oxide (PEO). The difference of physical behavior between Chs and PEO is the chain conformation in solution. The…
Magnetic properties and magnetic entropy change in La (Fe 1- x Mn x ) 11.7 Si 1.3 H y compounds have been investigated. A significant increase of the Curie temperature T C and a small increase of the saturation magnetizations µ S have been observed after the introduction of interstitial H, which caused a slight volume…
Synchrotron-radiation-based, energy-dispersive x-ray-diffraction studies have been performed on a composite containing nanometer-size aggregates embedded in an amorphous matrix, in the pressure range from ambient up to 15 GPa. The optically transparent material containing $\ensuremath{\beta}\ensuremath{-}{\mathrm{Ga}}…
Stress-induced frequency shifts of spun-cast nylon-6 films with α and γ crystals are studied at low strains with particular emphasis on vibrations related to hydrogen bonding and to the methylene chains. With increasing stress in the α films, there is a frequency increase of the NH stretching mode in the crystals wher…
Injectable composite tissue-engineering scaffolds are systems that incorporate individual cell carriers within a gel delivery matrix. This study assessed low-temperature casting as a possible method to produce synthetic cell-carrier beads. Porous poly-L-lactide beads were manufactured by low-temperature casting. Two p…
The controlled synthesis of biodegradable copolymers of dextran grafted with aliphatic polyesters first requires the preparation of polysaccharide derivatives soluble in organic solvents. Silylation of dextran can thus lead to such organosoluble derivatives and allows the polymerization of cyclic esters initiated from…
Features of the energy landscape sampled by supercooled liquids are numerically analyzed for several Lennard-Jones-like model systems. The properties of quasisaddles (minima of the square gradient of potential energy W=|∇V|2), are shown to have a direct relationship with the dynamical behavior, confirming that the qua…
A monodisperse polystyrene (PS) film was spin-coated on a silicon wafer with native oxide layer and was in part scratched by a blade. Then, the surface modulus on a given area, in which PS and bared silicon were present, was two-dimensionally mapped as a function of temperature by scanning viscoelasticity microscopy.…
This work documents a sharp adsorption cutoff for a cationic polymer (poly(dimethylamino ethyl methacrylate)) adsorbing onto a negative surface (silica) from buffered aqueous solution, as a function of ionic strength. In this system, electrostatic attractions drive adsorption, without contribution from chemical or hyd…
Potassium hydrogen phthalate crystal is a good nonlinear optical system. Its electro-optic coefficient r 131 is measured for a wavelength of 670 nm and it is found to be of the order of that of urea crystal (1.06 pm V −1 ). The dispersion study for the effective Pockels coefficients r eff = r 113 − r 112 , is carried…