Materials Literature
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Adverse tissue reactions of the gingiva and the periodontium close to dental cast alloys may be caused by the effects of released metal elements. Tissue reactions depend upon the amounts of elements available which are a function of corrosion rates. Since pH values of standard corrosion solutions are as low as 2.3, su…
The intercalation of copper underneath a graphite monolayer (MG) formed on Ni(111) has been investigated by means of HREELS, Auger spectroscopy and LEED. The softening of the graphite phonon modes in the case of the MG/Ni(111) system, caused by a strong interaction with the Ni substrate, is removed after intercalation…
CdS and CdS:Mn nanoparticles were studied by 113 Cd and proton NMR. Nanoparticle samples were synthesized by precipitation of CdS from an aqueous solution of Na 2 S and CdSO 4 . The nanoparticles were not deliberately capped by any surface-termination agent. The NMR spectra of CdS nanoparticles prepared with an excess…
Abstract Blends of low density polyethylene (LDPE) and linear low density polyethylene (LLDPE) are widely used for blown film applications. An accurate and rapid test scheme to identify the type and composition of α‐olefin in LDPE/LLDPE blends has been developed that utilizes differential scanning calorimetery (DSC) a…
Problems associated with intermittent and variable degrees of sample blackening are often reported for studies involving the preparation of CO 2 -bearing silicate glasses in piston- cylinder apparatus. This phenomenon is generally attributed to H infiltration, which leads to the reduction of CO 2 and the precipitation…
25 Mg NMR spectra for several silicate and aluminosilicate melts were obtained from 1000-1470 °C. The peaks are initially very broad, but narrow with increasing temperature to near 500 Hz at the highest temperatures. The peak positions for most of the melts do not shift noticeably with temperature in the range studied…
We have synthesized phospholipid polymers containing 2-methacryloyloxyethyl phosphorylcholine (MPC) units as novel blood compatible polymers and have evaluated their interactions with blood components. It was found that in the absence of anticoagulants, blood clotting was delayed and blood cell adhesion and activation…
Solid acids offer a simple and more benign alternative to traditional acid-catalyzed chemical processes. Ways in which this opportunity is being addressed through the synthesis and characterization of new solid acids incorporating perfluorosulfonic acid groups as proton donors are described. The Figure represents a pe…
Upon the intercalation of kaolinite with DMSO, new Raman bands at 3660, 3536, and 3501 cm -1 are observed for the low-defect kaolinite and at 3664, 3543, and 3509 cm -1 for the high-defect kaolinite. An additional band at 3598 cm -1 was observed for the high-defect kaolinite. The band at 3660 cm -1 was assigned to the…
Non-dispersive charge carrier transport and unusually large hole mobilities are reported for the ladder-type methyl-substituted poly(p-phenylene) MeLPPP, as investigated using the time of flight technique. Charge carrier transport in polymers generally occurs much more slowly than in molecular crystals owing to disord…
The tetraanionic meso-tetrakis(4-sulfonatophenyl)porphine (H 2 TPPS) in the pH range 5−12 exists in a monomeric form, and its fluorescence is not pH-dependent. However, in the presence of polylysine, absorption, circular dichroism, and resonance light scattering data indicate extensive polymer-induced self-aggregation…
Electrochemical impedance spectroscopy (EIS) was used to study carbon dioxide (CO2) corrosion product scales and their effects on further CO2 corrosion. Objectives were to determine the suitability of EIS for studying corrosion scales and to investigate the influence of environmental factors on scale formation. EIS pr…
Protein storage vacuoles are found in a variety of tissues but are especially abundant in the storage organs of fruits and seeds. In this review, we focus on the protein storage vacuoles of cereal aleurone. In the mature grain, these organelles are repositories for reserve nitrogen, carbon and minerals. Following imbi…
Abstract The thermal dehydration of naturally occurring Ca-montmorillonite has been studied by in situ X-ray diffraction at temperatures between 60–120°C. The time-temperature-dependence of the position of the basal (001) reflection reveals that interlayer water loss on isothermal dehydration occurs in two stages. Aft…
A multidimensional transition state theory (TST) approach is formulated for the study of elementary jumps involved in the diffusion of a gaseous penetrant in a glassy polymer, taking explicitly into account the coupling between polymer and penetrant degrees of freedom along each jump. In this approach, an initial pict…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSurface Properties of the Fluorine-Containing Graft Copolymer of Poly((perfluoroalkyl)ethyl methacrylate)-g-poly(methyl methacrylate)In Jun Park, Soo-Bok Lee, and Chang Kyun ChoiView Author Information Division of Advanced Chemical Technology, Korea Research Institute of Chemic…
In this paper, three case studies intending to apply smart materials to civil structures are presented. The first one is a study of response control using piezoelectric actuators. Actuators are inserted into the bottom of a column to produce a bending moment force. A control algorithm using the model matching method i…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDirect Observation of an Enzyme-Bound Intermediate in the Catalytic Cycle of the Metallo-β-Lactamase from Bacteroides fragilisZhigang Wang, Walter Fast, and Stephen J. BenkovicView Author Information Department of Chemistry The Pennsylvania State University 152 Davey L…
The fdsGBACD operon encoding the four subunits of the NAD+-reducing formate dehydrogenase of Ralstonia eutropha H16 was cloned and sequenced. Sequence comparisons indicated a high resemblance of FdsA (alpha-subunit) to the catalytic subunits of formate dehydrogenases containing a molybdenum (or tungsten) cofactor. The…
Abstract Low‐rate dynamic contact angles of 13 liquids on a polystyrene polymer are measured by an automated axisymmetric drop shape analysis – profile (ADSA‐P). It is found that 7 liquids yielded non‐constant contact angles, and/or dissolved the polymer on contact. From the experimental contact angles of the other 6…