Materials Literature
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Abstract This paper reviews the numerical, self‐consistent field theory of block copolymers and blends in which they are a major component, and the relationship of this approach to analytic theories of the weak and strong segregation limits. The major topics of interest are microphase separation and, in blends, its in…
Abstract Deformation experiments on chiral smectic C elastomers show a significant influence of the layer structure. In contrast to nematic systems a deformation of the smectic polydomain does not lead to a uniform director orientation. Obviously, the smectic layers lock in the polydomain structure in a transient netw…
Cylindrical cavities, viewed through the side as they collapsed onto solid surfaces, were studied using high-speed streak and framing photography. The cavities were collapsed asymmetrically using shock waves of varying amplitude so that the rear surface formed a high-speed jet which crossed the cavity and interacted w…
highest thermal displacements of this species occur along directions perpendicular to the proposed direction of motion, approximately towards the neighboring partially occupied site.
We measured skin elastic properties (distension ability, retraction ability, and the skin elasticity) of 4 different body sites, finger, hand, forearm, and chest, in 191 normal individuals by means of a new suction device and investigated the correlation of skin elastic properties with sex, site, age, and the degree o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative Kinetic Analysis by High-Resolution 29Si NMR Spectroscopy of the Initial Stages in the Sol-Gel Formation of Silica Gel from TetraethoxysilaneColin A. Fyfe and Patricia P. ArocaCite this: Chem. Mater. 1995, 7, 10, 1800–1806Publication Date (Print):October 1, 1995…
The efficiency of various imidazole derivatives as zinc corrosion inhibitors in hydrochloric acid (HCl) was investigated using electrochemical and gravimetric methods. A difference in efficiency (z) was observed with the introduction of different substituents into a imidazole skeleton. It was established that substitu…
Abstract Mechanical recycling of thermoplastics for high value applications is directly associated with restabilization. The state of the art of processing‐, long term heat‐ and light stabilization of recyclates in different polymers (e.g. PP, PP/EPDM, HDPE, LDPE, PS, PVC and various blends) with examples from packagi…
Abstract Cellulose derivatives with low degrees of substitution (i.e., DS < 1.5) often fail to reveal glass transition temperatures ( T g ) by virtue of their tenacious adherence to moisture, thus preventing systematic analysis of substituent effects (size and DS) on T g and T m transitions. On the other hand, cell…
A new rheometer is described. It consists of a transducer unit supplied with an electric impedance analyzing unit. The transducer unit converts a mechanical impedance into an electrical impedance by the piezoelectric effect. A detailed quantitative analysis of the interaction between the sample and the transducer is g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermoelectric effects in electrochemical systemsJohn NewmanCite this: Ind. Eng. Chem. Res. 1995, 34, 10, 3208–3216Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995https://pubs.acs.org/doi/10.1021/ie00037a0…
The effects of recombinant human interleukin-1 beta (rhIL-1 beta) on alveolar bone resorptive activity in rats were examined. Continuous administration of rhIL-1 beta or phosphate-buffered saline (PBS) was given via osmotic pumps for 3, 7 and 14 days to rats with silk ligatures around second maxillary molars. Other an…
The kinetics of the transformation of synthetically prepared mackinawite to hexagonal pyrrhotite have been studied to clarify the relationship between these two phases. Kinetic analysis using the Johnson-Mehl equation is based on measurements of the fraction of hexagonal pyrrhotite obtained by heating mackinawite samp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Examination on the Accuracy of Interfacial Tension Measurement from Pendant Drop ProfilesShi-Yow Lin, Li-Jen Chen, Jia-Wen Xyu, and Wei-Jiunn WangCite this: Langmuir 1995, 11, 10, 4159–4166Publication Date (Print):October 1, 1995Publication History Published online1 May 2…
Abstract A conducting polymer, poly( o ‐phenylenediamine) (PoPD), has been obtained as stable film onto an electrode surface by the electropolymerization of o ‐phenylenediamine in 0.1 mol dm −3 H 2 SO 4 . The film thickness did not exceed 0.85 μm because of its low electrical con‐ductivity. The virgin “doped” polymer…
Structural relaxation in an undercooled liquid confined between two parallel structureless plates is investigated by molecular dynamics simulations. It is found that the system exhibits a kinetic glass transition, detected as a crossover from hydrodynamic relaxation to a relaxation dominated by hopping processes. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst Isolation and Crystal Structure of Heavier Chalcogenenium Cations (RSe+, RTe+) Stabilized by Two Neighboring Amino GroupsHisashi Fujihara, Hisatomo Mima, and Naomichi FurukawaCite this: J. Am. Chem. Soc. 1995, 117, 40, 10153–10154Publication Date (Print):October 1, 199…
Sol–gel methods have been developed to prepare YNbO 4 , YTaO 4 , and other rare‐earth niobates and tantalates with fergusonite‐related crystal structures. At low temperatures, all of the fergusonites, with the exception of SmTaO 4 , crystallize in a metastable tetragonal (T′) structure similar to that of tetragonal zi…
The pathway from acetyl-CoA to butyryl-CoA serves as a major carbon metabolism channel in Clostridium acetobutylicum and other butyrate-forming clostridia, and the steps are similar to those involved in fatty acid metabolism. Recent findings are discussed, reviewing the isolation and characterization of the enzymes of…
Materials science is a field in which researchers strive not only to understand material properties but also to develop the predictive power to produce new materials with desired properties. Metallurgy is one subfield which has been rather successful in this regard. From a limited number of atomic species, a rich comp…