Materials Literature
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Abstract The formation of polymer films produced by the phase separation process occurring when a cast poly(etherimide)/N‐Methyl‐2‐Pyrrolidone solution was exposed to humid air was studied. It was found that above a relative humidity value of 27%, the films presented a cell‐like structure. The size of the cells was sh…
Abstract An aliphatic/aromatic copolyester, poly(butylene succinate‐ co ‐terephthalate) (PBST), was prepared to investigate the effect of the aromatic units on the enzymatic degradation of the poly(butylene succinate) (PBS) derivatives in the presence of a lipase originated from Pseudomonas cepacia (Lipase PS®). The d…
Abstract The effects of sub‐ppm levels of nitrogen dioxide and hydrogen sulfide, and the adsorbed water on the corrosion of silver were studied in order to get a better understanding of the atmospheric corrosion process. An in situ mass balance was taken to monitor the kinetic behavior and the surface and the corrosio…
High-pressure/high-temperature conditions of 8 GPa and 1000°C were used to synthesize the new rare earth oxoborates RE 4 B 6 O 15 (RE = Dy, Ho) in a Walker-type multianvil apparatus. The single crystal X-ray structure determination of Ho 4 B 6 O 15 revealed the following data: C2/c, a = 1164.1(1), b = 436.7(1), c = 18…
Two types of thermal control materials developed for space use are described. These new materials use a variable emittance radiator called the smart radiation device (SRD). The SRDs are based on La 0.82 Sr 0.175 MnO 3 and La 0.7 Ca 0.3 MnO 3 and comprise a thin and light ceramic tile. The materials undergo a metal-ins…
Confined liquids can have properties that are poorly predicted from bulk parameters. We resolve with 0.5 nm resolution the nanoscale perturbations that interfaces cause on fluidity, in thin 3-methylpentane (3MP) films. The films of glassy 3MP are much less viscous at the vacuum-liquid interface and much more viscous a…
A one-pot, soft-chemistry, surfactant-assisted co-assembly approach to prepare La(1-x)Sr(x)MnO(3) (LSM)/Y(2)O(3)-stabilized ZrO(2) (YSZ) nanocomposites for use as solid oxide fuel cell (SOFC) cathodes has been investigated. This material with sub-hundred nanometer grain sizes for each phase is the first such nanocompo…
The relation of space charge-derived quantities with aging stresses and time is discussed in this paper. Polyethylene-based materials, aged for different times under electrical and/or thermal stress, are subjected to space charge measurements. Quantities are derived, that is, the threshold for space charge accumulatio…
Elastic effects can have a pronounced effect on the phase-separation process in solids. The classical Ginzburg—Landau energy can be modified to account for such elastic interactions. The evolution of the system is then governed by diffusion equations for the concentrations of the alloy components and by a quasi-static…
A mathematical model for simulating flow fields in porous textiles with consideration of gravity is described in this article. The article focuses on the analysis of the physical model of liquid diffusion in porous textiles. The model assumes that the liquid water moves in the composite network of capillaries of the p…
ABSTRACT This work deals with the hypothesis that kinetic parameters for nonisothermal processes can be reliably obtained using a 1‐step method. Parameters were estimated for 3 typical processes: (1) no residence time distribution (RTD), (2) first‐order reaction with RTD, and (3) n th‐order reaction with RTD. When non…
The low-frequency mechanical properties of polycrystalline Ca 1-x Sr x TiO 3 (0.5 ≤ x ≤ 0.9) have been investigated as a function of temperature and bulk composition using the technique of dynamical mechanical analysis in three-point bend geometry. Ca 1-x Sr x TiO 3 forms a cubic solid solution at high temperatures. A…
An approach to decontamination of biological endospores is discussed. Specifically, the performance of an aqueous modified Fenton reagent is examined. A modified Fenton reagent formulation of cupric chloride, ascorbic acid, and sodium chloride is shown to be an effective sporicide under aerobic conditions. The traditi…
In the first part of this contribution, an overview is given of some of the main developments in food process engineering in the last 25 years of the 20th century. This overview is, of course, colored by the personal experience of the authors, but a sincere effort was made to maintain a general perspective. Topics tha…
Oxidizing, phosphorus, ester and amide derivatives of oleanolic acid 1 have been prepared. The antibacterial activity of compound 1 , isolated from the fruit barks of Periploca laevigata (Asclepiadaceae), and its derivatives have been tested using Tween-80 as complex agent to form a water-soluble triterpenes. The same…
Polymer ceramic composites form a suitable material system for low temperature fabrication of embedded capacitors appropriate for the MCM-L technology. Improved electrical properties such as permittivity can be achieved by efficient filling of polymers with high dielectric constant ceramic powders such as lead magnesi…
Many properties of open-cell ceramic foam monoliths prepared by means of the sponge replication method can be controlled by adjusting the viscosity of the ceramic slip to the pore count of the templating polymer sponge. Catalyst carriers with tailored strut thicknesses, relative densities, and void fractions in the ra…
The microbial production of L-(+)-lactic acid is rapidly expanding to allow increased production of polylactic acid (PLA), a renewable, biodegradable plastic. The physical properties of PLA can be tailored for specific applications by controlling the ratio of L-(+) and D-(-) isomers. For most uses of PLA, the L-(+) is…
The uses and limitations of the electrostatic probe for the measurement of charge densities on insulating surfaces are discussed. A development of the technique is described in which two important limitations have together been overcome: (i) The effects on the probe signal of charges on all points of the surface have…
Optimization of cell seeding and culturing is an important step for the successful tissue engineering of vascular conduits. We evaluated the effectiveness of using a hybridization oven for rotational seeding and culturing of ovine vascular myofibroblasts onto biodegradable polymer scaffolds suitable for replacement of…