Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of monolithic binary oxide gels by a nonhydrolytic sol-gel processR. Corriu, D. Leclercq, P. Lefevre, P. H. Mutin, and A. ViouxCite this: Chem. Mater. 1992, 4, 5, 961–963Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Publi…
We have cloned a gene from a Salmonella typhimurium with the ability to complement the rfaC mutation (heptose-deficient lipopolysaccharide, sensitivity to rough-specific bacteriophages, and susceptibility to hydrophobic antibiotics). A 1018-base pair EcoRV-Tth111I fragment, subcloned into the pBluescriptKS+ vector to…
Abstract The fabrication of poly(ethylene terephthalate), PET, into fibers, films, and containers usually involves molecular orientation caused by molecular strain, which may lead to stress‐ or strain‐induced crystallization (SIC). The SIC of PET was studied by the methods of birefringence, density, thermal analysis,…
ABSTRACT The characterization of the fibrillar collagens and the cellular control of their spatial deposition were studied in fish scales using immunofluorescence, electron microscopy, electrophoretic and HPLC analyses, immunoprecipitation and hybridization with cDNA probes. This study was carried out on undisturbed a…
We describe a new method for determining the real and imaginary parts of the material constants of piezoelectric resonators. Our method is applicable to any of the common resonator geometries, it is non-iterative and its accuracy is comparable to that of other methods which are currently in use.
Current transients due to evolution of metastable corrosion pits on stainless steel in chloride solution are shown to be preceded by sharp current spikes. These current spikes are measured in the picoampere regime and represent microscopically violent nucleation events. Not all nucleation events survive to produce met…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn explanation of anomalous dielectric relaxation properties of polypropylene glycolK. L. Ngai, A. Schoenhals, and E. SchlosserCite this: Macromolecules 1992, 25, 19, 4915–4919Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published i…
Effects of the concentration of ZrOCl 2 , calcination temperature, heating rate, and the size of secondary particles after hydrolysis on the preparation of high‐purity ZrSiO 4 fine powders from ZrOCl 2 .8H 2 O (0.2 M to 1.7 M ) and equimolar colloidal SiO 2 using sol–gel processing have been studied. Mechanical proper…
Aluminum borate, 9Al 2 O 3 ·2B 2 O 3 or Al 18 B 4 O 33 , was synthesized by the reaction of stoichiometric amounts of α‐Al 2 O 3 and B 2 O 3 . The Al 18 B 4 O 33 material was formed into a dense ceramic by pressureless sintering with CaO, MgO, or CaAl 2 B 2 O 7 additives. The material was characterized by low bulk den…
TiB 2 ‐particle reinforcement is one of the most successful methods for improving the fracture toughness of SiC ceramics. 1–3 Commercially available TiB 2 powders, however, have a large particle size and/or are highly reactive so that they are not favorable as a starting powder. In the present work, TiB 2 particles ar…
Carbothermal reduction kinetics to synthesize boron carbide are studied under conditions of high carbon/boron oxide precursor heating rates (> 10 3 K/s) and intermediate temperatures (1803 K < T < 2123 K). For these conditions, fractional carbon conversion, X, can be described by a nucleation–growth rate expr…
We study the one-dimensional tight-binding model with site energies arranged in the Thue-Morse sequence. To show the characteristics of eigenstates, we study the trace map, wave functions, and the resistance, and perform a multifractal analysis on the wave functions. Half of all the eigenstates are represented by latt…
Aspartate racemase from Streptococcus thermophilus contains no pyridoxal 5'-phosphate or other cofactors such as FAD, NAD+, and metal ions. It was affected by neither carbonyl reagents such as hydroxylamine nor sodium borohydride but was strongly inhibited by iodoacetamide and other thiol reagents. Aspartate, cysteate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXPS studies on conducting polymers: polypyrrole films doped with perchlorate and polymeric anionsLjiljana Atanasoska, Katsuhiko Naoi, and William H. SmyrlCite this: Chem. Mater. 1992, 4, 5, 988–994Publication Date (Print):September 1, 1992Publication History Published online…
Chromium self-diffusion coefficients in chromia (Cr2O3) single crystals were determined by both ion implantation and thick-film methods, using the 54Cr and 50Cr isotopes. The concentration profiles were established by secondary-ion mass spectrometry, and the diffusion coefficients were computed using a solution of Fic…
The authors present a model for the development of crystallographic texture by hot deformation in NdFeB magnets produced by rapid solidification. Favourably oriented grains, with their c-axis parallel to the compression axis, grow by mass transport through a Nd-rich liquid grain boundary phase, forming large platelet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel liquid-crystalline polymeric materials via noncovalent "grafting"C. Geraldine Bazuin and Frank A. BrandysCite this: Chem. Mater. 1992, 4, 5, 970–972Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of amorphous polymers. I. Different temperature dependences of segmental relaxation and terminal dispersionD. J. Plazek, X. D. Zheng, and K. L. NgaiCite this: Macromolecules 1992, 25, 19, 4920–4924Publication Date (Print):September 1, 1992Publication…
Electron channelling contrast is obtained in the scanning electron microscope by detecting back-scattered electrons created by a parallel incident electron beam. The intensity of the back-scattered electrons depends on the orientation of the incident beam with respect to the crystal lattice. In this report, several ex…
Alumina composites containing in‐situ‐formed hexaluminate (LaAl 11 O 18 , LaMgAl 11 O 19 , SrAl 12 O 19 , and Mg 2 NaAl 15 O 25 ) platelets can be pressureless‐sintered to high density. The grain morphology of the aluminates can be controlled by composition. A peak toughness 50% higher than that of alumina is obtained…