Materials Literature
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The thermoelectric properties of Sb-doped n-type and Ag-doped p-type Mg2Si0.6Ge0.4 samples were investigated in the temperature range 300 to 900 K. The scattering factor r was determined to be 0.0 by measuring the temperature dependence of the Hall mobility. Thermoelectric power and electrical conductivity were measur…
Chitin is one of the most abundant organic materials, being second only to cellulose in the amount produced annually by biosynthesis. 1 It occurs in animals, particularly in crustacea, molluscs and insects where it is an important constituent of the exoskeleton, and in certain fungi where it is the principal fibrillar…
In the field of hot strip mill finishing train, the demands for not only high quality of sheet product shape and sheet surface condition but also high productivity and energy saving in rolling are increasing. In this circumstance, we have developed completely new type compound roll which is composed of high-carbon hig…
Salts of trimetallo derivatives of 9-tungstosilicate heteropolyanions have been prepared from the lacunary tungstates α- and β-[SiW9O34]10– and characterized by elemental analysis, spectroscopy and electrochemistry. Tungsten-183 NMR spectra of the (four) diamagnetic derivatives of Al and Ga consist of two lines (inten…
Twins in a Ti-50.0 at%Ni martensite were studied by ordinary electron microscopy and diffraction, and high resolution electron microscopy (HREM) to characterize the twins in the martensite and to observe the twin boundaries on an atomistic scale. 〈011〉 Type II twins were most profoundly observed and confirmed to be a…
Transformation and self-accommodation mechanisms of the R-phase in Ti–Ni–Fe and Ti–Ni–Al shape memory alloys were studied by means of optical and electron microscope observations. Sequences of transformation events were recorded successfully with video tapes using a TV camera. Through the observation we found the foll…
Differences in the polymorphism and crystallinity of chitosan were found in membranes prepared by different procedures when examined by X-ray diffraction measurements for four samples of chitosan differing in the degree of polymerization. When an acetic acid solution of chitosan was dried in air and then soaked in an…
Abstract
A nonequilibrium structure consisting of fine quasicrystalline (icosahedral) grains surrounded by fcc-Al phase was found to form in rapidly solidified Al–Mn–Ce alloys. The formation of the nonequilibrium structure is limited to a composition range of 4 to 6 at% Mn and 2 to 3%Ce which is located around the phase bounda…
A novel class of macromonomer, in which the macromolecular part is a hyperbranched dendritic polyether prepared by the ‘convergent-growth’ approach, is synthesized and characterized. Free-radical copolymerization with styrene at various feed ratios gives a series of unique copolymers.
In general investigation of factional properties of fabrics, we demonstrate the influence of experimental variables on some new frictional parameters. Subjectively, fabrics with similar (or different) coefficients of friction yield different (or similar) tactile sensations of smoothness. Objectively, an examination of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on poly(o-methoxyaniline)Mool C. Gupta and Suresh S. UmareCite this: Macromolecules 1992, 25, 1, 138–142Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/ma00027a023h…
Stable colloidal dispersions of silver were prepared by ultrasonic irradiations of aqueous AgClO4 or AgNO3 solutions in the presence of surfactants.
The electromagnetic interference shielding effectiveness and return loss of short carbon-filled polychloroprene rubber composites of varying sample thickness and fiber aspect ratio were studied in the frequency range of 8 to 12 GHz (X-band). It was observed that composites prepared by the cement-mixed method with high…
Abstract Urea, various glycols and mixtures of these were tested as plasticizers for gelatinized cornstarch. Mixtures of cornstarch, urea and/or triethylene glycol, glycerol or propylene glycol were extruded into ribbons. Mechanical and structural properties of the ribbons were evaluated by tensile testing, DSC and NM…
The gradual shift from biostable prostheses to degradable, temporary implants represents one of the most significant trends in biomaterials research. In view of this trend, medical applications of degradable implant materials were reviewed with special emphasis on orthopedic polymeric implants. Among the polymeric imp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of polyoxometalates based inorganic-organic polymersP. JudeinsteinCite this: Chem. Mater. 1992, 4, 1, 4–7Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10…
We have designed and built an imaging filter which can be attached to most stan- dard TEMs, and is capable of operating at primary energies of up to 400 keV. The filter uses a 90m agnetic sector prism, a piezoelectrically controlled energy-selecting slit, and 6 quadrupole and 5 sextupole lenses. It fully corrects seco…
The structure of mullite was refined by the Rietveld method, and a new method for the estimation of chemical composition of mullite was proposed. Mullites were synthesized by firing the starting materials prepared by sol–gel and spray pyrolysis methods at various temperatures. Linear correlations were recongnized betw…
Abstract Physical properties of blown films (25‐60‐μm thickness) from compounded mixtures of linear low‐density polyethylene (LLDPE) and starch were investigated. As starch content increased, tensile strength, percent elongation, and light transmittance decreased and film thickness increased. Among the tested films, s…