Materials Literature
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The hemocompatibility of a polymer containing a phospholipid polar group, poly(2-methacryloyloxyethyl phosphorylcholine (MPC)-co-n-butyl methacrylate(BMA)), with human whole blood was evaluated. When human whole blood without an anticoagulant was contacted with polymers, the blood cell adhesion and aggregation on the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of colloidal dispersions of fluorescent, monodisperse silica spheresA. Van Blaaderen and A. VrijCite this: Langmuir 1992, 8, 12, 2921–2931Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1…
A review is presented of the point defect model (PDM) for the growth and breakdown of passive films on metal and alloy surfaces in contact with aqueous solutions. The model provides a reasonable account of the steady‐state properties of cation‐conducting and anion‐conducting barrier layers on nickel and tungsten, resp…
ADVERTISEMENT RETURN TO ISSUEPREVarticleNEXTA new family of mesoporous molecular sieves prepared with liquid crystal templatesJ. S. Beck, J. C. Vartuli, W. J. Roth, M. E. Leonowicz, C. T. Kresge, K. D. Schmitt, C. T. W. Chu, D. H. Olson, E. W. Sheppard, S. B. McCullen, J. B. Higgins, and J. L. SchlenkerCite this: J. A…
Anisotropic powders of Sm2Fe17Nx were prepared by the mechanical milling of Sm2Fe17 and nitriding. The effects of milling time, ball size, and heat treatment on the structure and magnetic properties have been studied. Short milling times resulted in particle attrition; disproportionation into a mixture of Fe and an am…
A systematic study of the effect of pressure up to 1 GPa on the spin reorientation transition (SRT) phenomena has been performed on several series of pseudoternary compounds (Er x R 1-x ) 2 Fe 14 B for R identical to Nd, Gd, Dy and Y using a low-field AC susceptibility technique. The variation in the SRT temperature T…
The selective chemical vapor deposition of the compounds, (hfac)CuL, where hfac=1,1,1,5,5,5-hexafluoroacetylacetonate and L=trimethylphosphine (PMe3); 1,5-cyclooctadiene (1,5-COD); vinyltrimethysilane (VTMS), and 2-butyne onto W in the presence of SiO2 has been studied as a function of surface pretreatment. Cleaning t…
The structure determination of apotransketolase and the comparison of its three-dimensional structure with that of the holoenzyme has revealed that no large conformational changes are associated with cofactor binding. Two loops at the active site are flexible in the apoenzyme which enables ThDP to reach its binding si…
By using the chemical shift in core-level photoemission from adsorbed species, we apply the technique of energy scan photoelectron diffraction to molecules containing nonequivalent atoms of the same element. As an example, we demonstrate the complete structural characterization of the surface acetate species on Cu{110…
The Ericksen-Leslie theory In this chapter we shall discuss the continuum theory of nematic liquid crystals and some of its applications. Many of the most important physical phenomena exhibited by the nematic phase, such as its unusual flow properties or its response to electric and magnetic fields, can be studied by…
Optical properties The unique optical properties of the cholesteric phase were recognized by both Reinitzer and Lehmann at the time of their early investigations which culminated in the discovery of the liquid crystalline state. When white light is incident on a ‘planar’ sample (whose optic axis is perpendicular to th…
This is a new and greatly revised edition of Professor Chandrasekhar's classic book Liquid Crystals, first published in 1977. The subject of liquid crystals has grown into an exciting interdisciplinary research field with important practical applications. This book presents a systematic and self-contained treatment of…
The degradation of the electrochromic film of a-WO<SUB>3</SUB> was investigated from the equilibrium state of different driving voltage and the time dependent emf was also obtained in an open or short circuit of zero volts. Based on the mechanism of activation and the principal of chemical reaction kinetics, the corre…
SiO2 thin films (1000-Å thick) were sputter deposited on GaAs substrates as a buffer layer in order to alleviate a thermal mismatching problem between ZnO films and GaAs substrates. Thermal stability of sputter-deposited ZnO films (0.5–2.0 μm thick) was tested on such a buffered GaAs substrate with a postdeposition he…
It is argued that the optical conductivity of face-centred icosahedral (FCI) quasi-crystals is dominated by band-structure effects. What makes FCI quasi-crystals different from conventional metallic alloys is the high multiplicity (namely, 42) of their reciprocal lattice vectors, which allows a better match between th…
Visible electroluminescence (EL) has been obtained from porous silicon cathodically biased in an aqueous electrolyte containing either the persulphate or the peroxide ion. EL efficiencies of up to 0.1% have been obtained from porous silicon formed on both n-type and p-type substrates for the application of only a few…
Evidence is presented, through high-resolution electron microscopy images, for the open-end growth of carbon nanotubes. Terminations of incomplete layers of carbon, seen on the tube surfaces and cone tips, suggest that the extension and thickening of the tubes occur by the island growth of graphite basal planes on exi…
The elastic modulus E of diamond is often set equal to 1/s<SUB>11</SUB> equals 1050 GPa, which assumes that is does not vary much with orientation, and many authors use (upsilon) equals 0.2 as an appropriate average value of Poisson's ratio, which is incorrect. In fact, since the elastic constants of diamond are known…
Nickel metal catalysts composed of nanometer by micrometer strips have been produced with solid-state microfabrication techniques. The strips are actually the edges of nickelcatalyst thin films, which are sandwiched between separating support layers, which are also nanometers thick. These linear nanostructures constit…
Photoluminescence spectroscopy studies of low energy erbium and erbium/oxygen-implanted silicon-nitride waveguides are compared. Emission spectra show peaks at 1533 and 1548nm. The optimum annealing temperature is determined to be 1175°C, yielding lifetimes up to 7ms and a several decade intensity increase. Er implant…