Materials Literature
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The stepwise synthesis and characterization of a family of selectively metalated 1,2-bis[5-(2,3,7,8,12,13,17,18-octaethylporphyrinyl)]ethenes is described. These compounds are distinct from most of the previously reported bisporphyrin systems which possessed rigid linking groups or multiple strapping units, and their…
A theoretical framework for the temporal behavior of photoinduced anisotropy in liquid-crystalline azobenzene side-chain polyesters is constructed. The domain structure of the material is taken into account and intermolecular interactions are included through a mean-field description. Photoinduced trans↔cis isomerizat…
The electrical and mechanical properties of piezoelectric lead zirconate titanate (PZT) ceramics are strongly influenced by domain‐wall motion, which can be tailored via the substitution of ions within the perovskite structure. Different domain mobilities are achieved by lead and/or oxygen vacancies, according to the…
We have determined the alignment of a Gay-Berne model liquid crystal near a graphite surface using Monte Carlo computer simulations. We find in this regime, where adsorption is dominating with respect to the intermolecular interactions, a discontinuous change in anchoring from planar to normal on going from the first…
We study the onset of sidebranching of growth cells in directional solidification of impure succinonitrile. Care is taken to obtain uniform cell spacing over large distances in order to use this variable as a true control parameter. Two sidebranching modes referring to different crystalline orientations are observed a…
For phase-separated multicomponent polymeric systems, characterization of the interface between the components is particularly challenging. We have observed an optical effect in the infrared that can be used to image the interface specifically. This method yields images of the interfaces based on the interfaces showin…
Phase separation (frequently called coacervation) of poly(lactide) (PLA) and poly(lactide-co-glycolide) (PLGA) is a classical method for drug microencapsulation. Here, attempts have been made to describe this process in the light of thermodynamics. Different PLA/PLGAs were dissolved in either dichloromethane or ethyl…
Mixtures of yttrium acetate hydrate (Y(O 2 CCH 3 ) 3 4H 2 O) and aluminum formate hydrate (Al(O 2 CH) 3 3H 2 O in H 2 O) or yttrium isobutyrate (Y[O 2 CCH(CH 3 ) 2 ] 3 ) and aluminum isobutyrate (Al[O 2 CCH(CH 3 ) 2 ] 3 ) in tetrahydrofuran were used as precursors to process yttrium aluminum garnet (YAG, Al 5 Y 3 O 12…
Collagen fibrils in ligaments and tendons are highly organized into parallel arrays which influence interstitial fluid transport. Finite element (FE) models were developed analogous to the fibrillar arrays in ligaments and tendons to investigate interstitial fluid flow and tissue permeability as a function of interfib…
ABSTRACT A device to objectively measure the melt/flow behavior of cheeses at different temperatures was built consisting of a temperature‐controlled heater, an LVDT (linear variable differential transformer), and a personal computer with a data acquisition system. This device, named UW Meltmeter, operates in the lubr…
In this paper we bring together and extend two recent developments in phase-field models, namely, a phase-field model of a multiphase system [I. Steinbach et al., Physica D 94, 135 (1996)] and the extension of the Cahn-Hoffman \ensuremath{\xi}-vector theory of anisotropic sharp interfaces to phase-field models [A. A.…
The formation of thin, well-ordered β-Ga2O3 films on CoGa(001) was studied by means of high resolution electron energy loss spectroscopy (EELS), scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and Auger electron spectroscopy. The crystalline β-Ga2O3 films on CoGa(001) are prepared upon ads…
The dimer potassium dioxo(citrato)vanadate(IV)-6-water, K(4){VO[O(2)CCH(2)C(O)(CO(2))CH(2)CO(2)]}(2).6H(2)O, was prepared by the reaction of citric acid and metavanadate in a neutral solution. The complex crystallizes in the space group P&onemacr; with unit cell parameters a = 8.474(5) Å, b = 8.902(7) Å, c = 9.596(9)…
A new one-step method, entitled fluidized-bed metal-organic chemical vapor deposition (FBMOCVD) of preparing highly dispersed metal-supported catalysts is reported. The following complexes were studied and used as CVD precursors in presence of H2: [Rh(μ-Cl)(CO)2]2, Rh(allyl)3, Rh(acac)(CO)2, Pd(allyl)(hfac), Pd(allyl)…
ABSTRACT The subject of stickiness is reviewed briefly in this paper, together with the factors influencing perceived stickiness in different contexts. A clear understanding of the difference between adhesive and cohesive failure mechanisms, and the factors influencing them, is a key requirement in developing successf…
The design, synthesis, and spectroscopic and chemical properties of four members of a new class of heterobifunctional photocleavable (caged) cross-linking reagents were described. One of the two reactive groups of the cross-linker reacted with amino groups to form the corresponding photolabile carbamates. Amino group…
The effect of UV curing intensity and curing time on the electro-optic behaviour and network morphology of reverse mode polymer stabilized cholesteric textures (PSCTs) has been studied. Scanning electron micrographs indicate that increasing the curing intensity generally results in a more open polymer network characte…
ABSTRACT The effects of temperature, relative humidity (%RH) and permeant concentration on aroma permeability were investigated in edible whey protein isolate (WPI) films. An orthogonal regression was performed to ascertain significance of these factors. Temperature and %RH had exponential effects on d‐limonene permea…
The Curie temperatures of lead zirconate titanate‐based (PZT‐based) composites that were incorporated with silver particles were evaluated as a function of the silver content. Although the substitution of the silver ion has been considered to decrease the Curie temperature, PZT/silver composites exhibited higher Curie…
The Brazilian National Synchrotron Light Laboratory (LNLS) has a dedicated protein crystallography beamline. The optical elements of the beamline include an elastically bent cylindrical mirror and a triangular bent-crystal monochromator, which focus synchrotron radiation at the position of the sample in the vertical a…