Materials Literature
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The internal structure (the monomer density profiles) of weakly charged polyelectrolyte brushes of different morphologies has been analyzed on the basis of the self-consistent-field approach. In contrast to previous studies based on the local electroneutrality approximation valid for sufficiently strongly charged or d…
The packing of cylindrical particles with log‐normal and modified power‐law length distributions has been experimentally studied. The results indicate that the packing density is heavily dependent on the parameters in the two distributions. However, this dependence cannot be predicted by the direct analogy to that for…
The water uptake of nominally 5%‐Yb‐doped strontium zirconate (SrZr 0.95 Yb 0.05 O 3−α ) was studied in situ by thermogravimetry at different temperatures and water vapor pressures. The process could be described in terms of an ideal solution behavior, showing a lower effective vacancy concentration than that expected…
An efficient first-order algorithm with an exact calculation of the gradients is described and applied to the refinement of inhomogeneous dielectric thin films. Numerical results calculated at normal and oblique angles of incidence are correlated with an important mathematical theorem. It is shown that, when appropria…
The authors present a robotic system incorporating vision and force/torque sensing for handling flat textile materials and describe the results of experiments to measure the accuracy and reliability of the system for a variety of representative handling tasks for textile materials.
The aliphatic double bond of poly(2-cinnamoylethyl methacrylate) (PCEMA) displayed a characteristic surface-enhanced Raman scattering (SERS) peak at 1640 cm -1 . Polystyrene (PS), together with the phenyl rings of PCEMA, contributed to the peak at 1005 cm -1 . We determined the intensity ratio of these two peaks, i.e.…
The effect of flexible spacer length on the phase transitions and mesophase structures of main-chain thermotropic liquid-crystalline polyesters having bulky pendent side groups was investigated using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and polarizing optical microscopy (POM).…
DSC measurements have been performed on the monomeric form of yeast hexokinase B in the absence and presence of increasing concentrations of D-glucose. The hexokinase, in the absence of D-glucose, at both pH 8.0 and 8.5, shows reproducible calorimetric profiles characterized by the presence of two partially overlapped…
Abstract: Complex permeability spectra @*=p'-ip") in Mn-Zn ferrite and its composite materials have been studied. In sintered ferrite, resonance-type frequency dispersion was observed at room temperature but decrement ofp ' is steeper than that of ordinary resonance. As the temperature is de…
The spontaneous microcracking of particulate TiB 2 –SiC composites is studied as a function of TiB 2 volume fraction. The degree of microcracking was examined by measuring elastic properties from room temperature to 1300°C. The results showed that only one composition contains microcracks. All other compositions did n…
The liquid crystalline behaviour of 1-(4-n-decyloxyphenyl)-3-(4-X-phenyl)propan-1,3-diones and their pyrazole and isoxazole derivatives has been studied by optical microscopy, DSC and X-ray techniques. The 4-substituents (X) were chosen to include a range of different polar and non-polar substituents: H, OCH3, Cl, Br…
We have synthesized and studied trisbenzocyclononenes carrying six chiral side chains. They are pyramidic shaped molecules exhibiting columnar mesophases. The optical and electrooptical effects of this chiral pyramidic compound have been studied. A homeotropic alignment of the columnar phase was achieved by cooling th…
To regulate the reactivity of dithiolene dioxomolybdenum(VI) complexes, two systems were studied: (1) chelate recognition with a diamide additive, 1,3-bis(isobutyrylamino)benzene (1); (2) a dithiolene complex with four amide substituents, (n-Pr(4)N)(2)[Mo(IV)O{S(2)C(2)(CONH(2))(2)}(2)].0.5(i-PrOH).DMF (2) (S(2)C(2)(CO…
OBJECTIVE: The main disadvantage of implanted cardiac valve bioprostheses remains primarily tissue failure due to calcification. Coating of bioprostheses with viable autologous endothelial cells may delay or even eliminate tissue calcification and subsequent cardiac dysfunction. METHODS: Glutaraldehyde-preserved Hanco…
Optical and structural properties of chemically deposited CdS films have been characterized by using spectroscopic ellipsometry and electron transmission microscopy. Three representative cases have been studied using grown metastable cubic film and two films annealed at 400 °C (30 min) with and without a CdCl 2 pretre…
The volumetric swelling ratios of three coals and their maceral concentrates in the presence of pyridine were determined by the displacement of a piston and by the measurement of swollen and unswollen particle size distributions using a laser diffraction particle size instrument. The use of particle size distributions…
Develops an understanding of the energy delivery system and determines how the scanning speed and part strength are affected by particular scanning parameters. Describes a high speed process workstation incorporating a variable beam spot size. Presents a more accurate sintering model which can be used to speed up the…
Carbon onions—concentric spherical graphite layers stacked one inside the other —are stable only during electron irradiation. If the irradiation is continued at high temperature, self‐compression is shown to occur, in which the individual layers are compressed until the onion cores finally transform into diamond cryst…
Abstract The characteristics of thermal degradation, peroxide induced degradation, and maleation of polypropylene have been modeled in a modular intermeshing twin screw extruder for a range of screw configurations and screw speeds. The models use the Akro‐co‐Twin Screw® formulation and account for starvation and fully…
Abstract Utilization of a less stoichiometric amount of aldehyde in portions and addition of water to the reaction mixture depressed the tar formation, affording much easier isolation of meso ‐tetraalkylporphyrins. The title porphyrins bearing methyl, ethyl, or n ‐propyl substituents were synthesized in isolated yield…