Materials Literature
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A combined chemical and enzymatic procedure has been developed to synthesize macroscopic poly[(R)-(-)-3-hydroxybutyrate] (PHB) granules in vitro. The granules form in a matter of minutes when purified polyhydroxyalkanoate (PHA) synthase from Alcaligenes eutrophus is exposed to synthetically prepared (R)-3-hydroxybutyr…
Optical spectra and their temperature dependence have been investigated for a prototypical double-exchange ferromagnet ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ ( $x\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.175$). The optical conductivity spectrum above ${T}_{c}$ is characterized…
The tendency of a polypeptide chain to form alpha-helical or beta-strand secondary structure depends upon local and nonlocal effects. Local effects reflect the intrinsic propensities of the amino acid residues for particular secondary structures, while nonlocal effects reflect the positioning of the individual residue…
N-channel field effect transistors with excellent device characteristics have been fabricated by utilizing C60 as the active element. Measurements on C60 thin films in ultrahigh vacuum show on-off ratios as high as 106 and field effect mobilities up to 0.08 cm2/V s.
The optical properties of ${\mathrm{Mo}}^{3+}$ in phosphate glass have been investigated in the 4.2--300 K temperature range by using steady-state and time-resolved narrow-band laser spectroscopy. Steady-state absorption and emission spectra, emission lifetimes, and time-resolved spectra are presented. Fluorescence fr…
This investigation proposes the development of the selective dissolution process for recycling food packaging and other polymeric wastes. This process takes into account that the specific solvent of a particular polymer which is to be separated, must be a non-solvent for the remaining polymers. Likewise, taking into a…
Detailed techniques for the construction of low (4–300 K) and high (300–700 K) temperature uniaxial stress application devices are described, designed for studying stress-induced effects, including ferroelastic (/ferroelectric) detwinning, induced phase transitions, piezo-optical effects in ferroic crystals under in s…
The use of polymers for under-the-hood automobile parts is growing rapidly. During driving, these parts are exposed to a wide range of potentially harmful conditions, including high temperatures and corrosive chemicals. Such exposure conditions can cause changes in a polymer that might affect its long-term performance…
The initiation of electrochemical reductive degradation (ECRD) of polyvinylchloride (PVC) by the active products of electrochemical reduction of dimethylformamide (DMF) and acetonitrile (MeCN) has been investigated. It was determined that ECRD leads to dehydro-chlorination of PVC and brings into appearance polyconjuga…
Abstract Optically active dihydrobenzofurans and dihydrofuropyridines were synthesized and shown to be good chiral dopants for ferroelectric liquid crystals.
The reaction product of with aniline in water was subjected to various analyses before and after its discharge and charge to determine its physical state and electrochemical reactions. From these analyses, it can be seen that there are two possible states for the reaction product before the discharge; one is a mixture…
Abstract— Liquid‐crystal molecules on a rubbed‐polymer alignment layer are oriented at a polar angle tilted away from the surface, but the physical reason for this pretilt is not clearly understood. We have developed a new method to determine the three‐dimensionally tilted direction of the polymer by precise measureme…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT13C CP/MAS NMR Analysis of Isotactic Poly(3-methyl-1-butene)Anna Borriello, Vincenzo Busico, Claudio DeRosa, and Dirk SchulzeCite this: Macromolecules 1995, 28, 16, 5679–5680Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue…
Abstract We use conformal mapping techniques to derive the quasianalytical formulas for calculating the effective dielectric constants of coplunar lines on LiNbO 3 substrates having a buffer layer. Our calculations agree well with the results obtained using the point‐matching method. © 1995 John Wiley & Sons, Inc.
Abstract This review of the current status of conducting polymers will focus on recent progress which demonstrates that the initial promise of the late 1970's has become reality. Conducting polymers are now available as materials with truly unique properties: They combine the important electronic and optical propertie…
Thrombogenesis is considered the principal cause of early failure of arterial grafts. Although antithrombotic drugs are recommended, their efficiency under low blood flow conditions is still being debated. In this study, we evaluated the ability of three drugs to modify the thrombotic properties of blood and, conseque…
The recent measurements of thermal conductivity of diamond are explained by the two-step model of normal process. The phonon scattering of isotopic defects is used as a main variable to fit the measurements. The enhancement of thermal conductivity at 300 K by reduction of the isotope concentration from 1.1% to 0.07% i…
It is proposed that a size scale may be introduced into a crystal plasticity model by including the energy associated with boundaries between adjacent crystal segments. A finite element model is developed where the crystal behavior is governed by a crystal plasticity model and the boundary energy between neighboring e…
Macroscopic tensorial physical properties that are different in two domains of a ferroic crystal provide a tensor distinction of the two domains. This tensor distinction is determined from a symmetry relationship, called a twin law, between the bulk structures, the domain states, of the two domains. The simplest type…
A low cost processing technique called reaction forming for the fabrication of near-net and complex shaped components of silicon carbide based ceramics and composites is presented. This process consists of the production of a microporous carbon preform and subsequent infiltration with liquid silicon or silicon-refract…