Materials Literature
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Micellar aggregates of the nonionic peptide derivative Boc-Leu-Asn-OCH 2 CH 3 ( 1 ) have been observed in aqueous solution. Evidence for micelle formation of the above peptide was obtained by conductometric and fluorescence spectroscopic techniques. Keto−enol tautomeric ratio of benzoylacetone was taken for the determ…
Linear dichroism and second-harmonic generation (SHG) have been measured in Langmuir-Blodgett (LB) multilayers of Z-type structure of amphiphilic indandione-1,3 pyridinium betaine (IPB) with an aliphatic tail containing 17 carbon atoms (C17IPB). The dichroic ratio As/Ap of electronic absorption of s- and p-polarised l…
A disulfide bond is known to cleave under certain electrochemical conditions. The authors have developed a model in vitro drug delivery system based on this type of cleavage with possible applications in the transdermal drug delivery field. The system consists of a drug moiety chemically bound by a disulfide bridge to…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTIsolation and Structural Characterization of the Macrocyclic Dimer Present in Bisphenol-A PolysulfoneHoward M. Colquhoun and David J. WilliamsView Author Information Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K. Department of Chemistry…
The ID phase-field transition system introduced by Caginalp to describe the moving boundary in melting problems is considered. It is discretized by finite differences and three algorithms are presented to solve the resulting nonlinear algebraic system: the Newton method, an improved Newton method with reduced system a…
The formation mechanism of {332}〈113〉 twin, one of the deformation modes in metastable β type titanium alloys, was examined by high resolution transmission electron microscopy (HR-TEM) and simulation. The interface structure of twin resembled to α″ martensite. Peculiar movement of atoms to form {332}〈113〉 twin was exp…
A sulfur-oxidizing bacterium strain NB1-3 isolated from corroded concrete was a Gram negative, non-spore-forming, and rod-shaped bacterium (0.5–1.0x 1.5–2.0μm) with a polar flagellum. Strain NB1-3 had its optimum temperature and pH for growth at 30°C and 3.0–4.0, respectively. Strain NB1-3 had enzyme activities that o…
The present study deals with the sorption of water on Kevlar®‡ fibers and on a selected range of fiber-reinforced samples, in order to characterize the related interactions and to determine their influence on the dynamic properties (tan δ) of the specimens tested. The diffusion coefficients and the water content value…
The behavior of methoxy species on dimethyl ether (DME) adsorbed CeO 2 was investigated using temperature-programmed desorption (TPD) and infrared (IR) spectroscopy. TPD experiments showed that the thermal desorption peaks at 470−500 and 570 K are all DME from DME/CeO 2 adsorbed at 300 K. These DME desorptions are att…
The porosity, composition, and temperature dependence of thermal properties in porous Ni/yttria-stabilized zirconia (YSZ) cermets has been investigated at high temperatures by the laser flash diffusivity method. At a temperature range of 1073 to 1273 K, there is no temperature dependence of thermal diffusivity of the…
Laminated metal composites (LMCs) are a unique form of composite material in which alternating metal or metal containing layers are bonded together with discrete interfaces. The mechanical properties of these materials are reviewed. The tensile properties at low and high temperatures are described. At low temperature,…
The synthesis and dopant properties of both the (R,R,R,R,R)- and (S,S,S,S,S)-hexadecyloxy{pentakis [4-(1-methylheptyloxy)-phenylethynyl]} benzene enantiomers are described. Although the materials were found not to be liquid-crystalline, it was found possible to induce left [for the (R,R,R,R,R)-enantiomer] and right ha…
Reactions of MCl3(M = As, Sb or Bi) and 1,4,7-trimethyl-1,4,7-triazacyclononane (Me3[9]aneN3= L) gave the respective 1 : 1 adducts as white-yellow microcrystalline solids which were characterised by microanalytical and spectroscopic (IR and 1H NMR) data. Addition of water to AsCl3L under controlled stoichiometry in ac…
Cysteine is one of the 20 amino acids, and one of the two sulfur-containing amino acids. The highly reactive sulfhydryl group is often used for conjugating proteins to other entities. Furthermore, in a thin film, measurement of chemical shifts of the constituent atoms of cysteine are important in determining its inter…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTSurface Analysis: X-ray Photoelectron Spectroscopy and Auger Electron SpectroscopyNoel H. Turner and John A. SchreifelsView Author Information Chemistry Division, Naval Research Laboratory, Washington, D.C. 20375-5342 Department of Chemistry, George Mason University, Fairfax,…
A kinetic study of the solid-state reaction between the polyimide precursor monomers PMDA and ODA has been carried out in the temperature range between −50 and +23 °C, using molecular beam deposition (MBD) for film growth and transmittance infrared spectroscopy (FTIR) for reaction monitoring. The product of this react…
The aim of the present work is to study the influence of the sequential or competitive adsorption of anti-HSA (Human Serum Albumin) IgG and RSA (Rabbit Serum Albumin) onto a negatively charged polystyrene latex on the colloidal stability of the immunoiatex (IgG-RSA/latex). Anionic (1-2) latex was prepared by surfactan…
In certain applications, a reinforced composite is used as an adhesive layer. In this study, the bulk mechanical behaviour of composite films based on a poly(vinyl acetate) (PVAc) matrix and various calcium carbonate (CaCO3) fillers was investigated. The interactions depend on the morphology and chemical structure of…
Hexamethylhydrazinocyclotriphosphazene N3P3 (NMe-NH2)6 1 is a useful precursor for the synthesis of functionalized hexahydrazones (3a-f), multicyclic (5) and multimacrocyclic (7) species, and small dendrimers (8 and 10). © 1996 John Wiley & Sons, Inc.
Polymer blends, mixtures, or block copolymers can be cross-linked in a homogeneous state forming a multicomponent network. Upon cooling such network, the repulsion between different components may lead to a microphase separation into regions rich in each of these components. The main difference of the microphase separ…