Materials Literature
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A rapid fixation/dehydration method of plant specimens for scanning electron microscopy is presented. Prior to critical‐point drying (CPD) the specimens are immersed in pure methanol. Methanol incubation instantly fixes the elastically extended cell walls. Owing to this instant fixation, shrinking of the specimens is…
Other| October 01, 1996 Synthesis, characterization, and energetics of solid solution along the dolomite-ankerite join, and implications for the stability of ordered CaFe(CO 3 ) 2 L. Chai; L. Chai Princeton University, Department of Geological and Geophysical Sciences, Princeton, NJ, United States Search for other wor…
The electrical performance of outdoor insulation degrades severely during combinations of factors that include surface contamination (C), ice (I), fog (F) and an ambient temperature that rises through 0 C (T{sub 0{degree}}). Failures at operating voltage on 115-kV, 230-kV and 500-kV systems occur with increasing proba…
The antiferroelectric (AFE)-ferroelectric (FE) phase transformation under dc bias and hydrostatic pressure conditions in tin-modified lead zirconate titanate ceramics [Pb(Zr,Sn,Ti)O3, i.e., PZST] was investigated. The shifting of transformation temperature under these conditions and an electric field induced lattice s…
Atomic force microscope examinations of the free surface and of microtome cuts of a cholesteric oligomer are reported. The obtained images lead to a model of the structure of cholesteric focal conic domains that appear spontaneously at the free surface. These domains develop in order to fulfill the boundary condition…
Abstract The influence of lactide configuration on the chain microstructure of lactide/ε‐caprolactone copolymer was investigated. The copolymerization was carried out in the presence of Al(acac) 3 , AlEt 3 and ZnEt 2 as initiators. The chain microstructure analysis of the copolymers was performed by means of 13 C NMR…
A modified electrochemical noise (EN) technique (electrochemical emission spectroscopy [EES]) was developed for nondestructive, real-time corrosion rate measurements. Unlike conventional corrosion-rate measuring techniques that use external signals, this technique uses signals generated by the corroding system. It can…
Carbon single-wall nanotubes (SWNTs) are essentially elongated pores of molecular dimensions and are capable of adsorbing hydrogen at relatively high temperatures and low pressures. This behavior is unique to these materials and indicates that SWNTs are the ideal building block for constructing safe, efficient, and hi…
Abstract Since the first reports on the combination of liquid crystalline polymers in block (1985) and graft (1986) copolymers with amorphous and semi‐crystalline polymers, the scientific interest has been focused on understanding how the size and type of the mesophase displayed by the liquid crystalline part(s) affec…
In a multidimensional domain, the slow motion behavior of internal layer solutions with spherical interfaces, referred to as bubble solutions, is analyzed for the nonlocal Allen–Cahn equation with mass conservation. This problem represents the simplest model for the phase separation of a binary mixture in the presence…
We have confirmed the theory of Ishibashi and Orihara for the frequency dependence of coercive fields in ferroelectric thin films.SrBi2NbTaO9, SrBi2Ta2O9, and PbZr1-x Ti x O3 (PZT) data from DeVilbis et al. reveal a power-law dependence of form Ec (f) = Bfd/α , where d is the dimensionality of domains (ca. unity in un…
A numerical investigation is presented of axisymmetric, static and elongating, viscous Newtonian liquid bridges confined between identical circular disks. The time-dependent interface shapes and applied forces on the end plates, which separate at a constant prescribed velocity, are calculated as functions of the capil…
Abstract In the 12 km 2 catchment area of Syv creek, Denmark, moderate to high concentrations of nitrate (NO 3 − ) occurred in the upper part of the oxidized zone (oxic-I), but dropped within the lower suboxic part (oxic-II), to below the detection limit in the unoxidized zone. Structural Fe 2+ in the clay minerals ma…
A variant of the powerful thin-film needle design technique, which was first described by Tikhonravov and his co-workers, is described. In this method thin layers are introduced at optimum positions within the refractive-index profile of a given multilayer system. In the original method the optimum locations for the l…
Titania powders have been prepared by the thermal hydrolysis of titanium sulfate at 80°C in a mixed solvent of n ‐propyl alcohol ( n ‐PrOH) and water. The morphology of the powders was greatly influenced by the volume ratio in n ‐PrOH to water (RH ratio) of the solvent. An RH ratio of 1.0 was essential for the formati…
A determination has been made of the glycerol concentration required to form an amorphous glass at 100 K with each of the 50 Crystal Screen I Solutions (Hampton Research, Laguna Hills, California, USA) which form a coarse matrix screen of crystallization conditions for macromolecules. These measurements give a startin…
Free amino groups in β-chitin from squid pen were acetylated to obtain N-acetylated β-chitin. After careful control of degree of acetylation, thermal and mechanical properties of β-chitin and N-acetylated β-chitin were compared. The structural differences of β-chitin and N-acetylated β-chitin were characterized by Fou…
The effect of molybdenum on the electronic structure of the passive films formed on ferritic (Fe‐Cr and Fe‐Cr‐Mo) stainless steels is examined by capacitance and photoelectrochemical measurements. The capacitance study is supported by a mathematical analysis of the Schottky barrier developed at the semiconductor‐elect…
The effect of confinement on the crystallinity and chain orientation of ultrathin poly(di-n-hexylsilane) films has been investigated using UV absorption, fluorescence and IR spectroscopies. UV absorption measurements in a series of poly(di-n-hexylsilane) films having thicknesses between 50 and 3500 Å have shown that,…
The GLIADEL® wafer is a polyanhydride implant used in the treatment of malignant glioma, in which the anticancer agent carmustine (BCNU) is incorporated into a copolymer matrix consisting of 1,3-bis(p-carboxyphenoxy)propane (CPP) and sebacic acid (SA) in a 20 to 80 molar ratio (p(CPP:SA, 20:80)). It is crucial to dete…