Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of Concentration Fluctuations on the Dielectric .alpha.-Relaxation in Homogeneous Polymer MixturesG. Katana, E. W. Fischer, Th. Hack, V. Abetz, and F. KremerCite this: Macromolecules 1995, 28, 8, 2714–2722Publication Date (Print):April 1, 1995Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConfined Block Copolymer Thin FilmsNagraj Koneripalli, Navjot Singh, Rastislav Levicky, Frank S. Bates, Patrick D. Gallagher, and Sushil K. SatijaCite this: Macromolecules 1995, 28, 8, 2897–2904Publication Date (Print):April 1, 1995Publication History Published online1 May 2…
We compare the metal-rich globular clusters within 3 kpc of the galactic center with the underlying stellar population. On the basis of kinematics, spatial distribution, and metallicity, we argue that these clusters may be associated with the galactic bulge (as concluded by Frenk & White 1982) rather than with the…
Abstract The Rothemund‐type condensation of pyrrole and benzaldehyde yields, apart from 5,10,15,20‐tetraphenylporphyrin (TPPH 2 ) and inverted tetraphenylporphyrin 2‐aza‐21‐carba‐5,10,15,20‐tetraphenylporphyrin (CTPPH 2 ), a unique pentapyrrolic macrocyclic molecule with the aromatic nucleus of sapphyrin, namely, 5,10…
Scientific interest, technological promise, and increased availability of highly enriched isotopes have led to a sharp rise in the number of experimental and theoretical studies with isotopically controlled semiconductor crystals. This review of mostly recent activities begins with an introduction to some past classic…
RhoB, a small GTP-binding protein, was shown previously to contain farnesyl (C-15) as well as geranylgeranyl (C-20) groups (Adamson, P., Marshall, C. J., Hall, A., and Tilbrook, P. A. (1992) J. Biol. Chem. 267, 20033-20038). The COOH-terminal sequence of the protein is CCKVL. According to current rules of prenylation,…
Summary The effects of globule size, nature and concentration of surfactant, and drying duration of water vapour transmission rate and tensile strength of emulsified edible barriers containing methylcellulose and paraffin wax, were measured. of the six surfactants tested, 0.6% purified glycerol monostearate (GMS) prod…
Ferroelectric ceramics are susceptible to fracture under high magnitude cyclic electric field. Flaws concentrate the electric field, inducing a large incompatible strain, and thereby a large stress. Stable growth of cracks with either conducting or insulating interiors is observed in 8/65/35 lanthanum lead zirconate t…
A high, rounded peak of the permittivity, ${\mathrm{\ensuremath{\varepsilon}}}_{\mathrm{max}}^{\ensuremath{'}}$\ensuremath{\approx}6\ifmmode\times\else\texttimes\fi{}${10}^{4}$, at T\ensuremath{\approx}18 K evidence a percolative-type phase transition into a random-field-induced ferroelectric domain state of the doped…
Nanocrystalline CeO 2 powders were prepared electrochemically by the cathodic electrogeneration of base, and their sintering behavior was investigated. X‐ray diffraction and transmission electron microscopy revealed that the as‐prepared powders were crystalline cerium(IV) oxide with the cubic fluorite structure. The l…
Abstract The vibrational modes of clay minerals are uniquely accessible to FT Raman spectroscopy, but this potentially powerful technique has found limited application to the study of clay mineral structure. Raman spectra in the 50 to 3800 cm −1 region were obtained for a number of kandite clays. The kandite clay mine…
A combination of multiple-angle-of-incidence ellipsometry (MAIE) and environmental SEM (ESEM) was used to characterize the microstructure of acrylic latices during all four stages of film formation, starting from an aqueous colloidal dispersion (Stage I) and evolving to a continuous coating having no internal solid-so…
The synthesis and basic characterisation are reported for 85 new solids of the general formula [ML(x)][Ln-(dipic)(3)] . nH(2)O (M = Cr or Co; L = urea, ammonia, and various amines; Ln = La-Lu, plus Y; dipic = pyridine-2,6-dicarboxylate). Syntheses of some seven Cs-3[Ln(dipic)(3)] and [N(C2H5)(4)](3)[Ln(dipic)(3)] spec…
Abstract A new, general synthesis of the first β ‐substituted tetra‐ and hexaalkyl terpyrroles is described. Also described are two new classes of expanded porphyrins derived from the hexaalkyl terpyrrole. The key step in the terpyrrole formation is the copper( II )‐mediated oxidative coupling of the LDA‐derived enola…
The flexural stiffness of the rachis varies along the length of a primary feather, between primaries and between species; the possible contribution of variations in the longitudinal Young's modulus of feather keratin to this was assessed. Tensile tests on compact keratin from eight species of birds belonging to differ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Use of Hydrotalcite as an Anion AbsorbentLinda M. Parker, Neil B. Milestone, and Roger H. NewmanCite this: Ind. Eng. Chem. Res. 1995, 34, 4, 1196–1202Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 1995https:/…
π‐conjugated polymers substituted with optically active side chains (see Figure) have been studied using circular dichroism, a powerful technique which reveals conformational changes. Thermochroism with a unique stereomutation (see this month's cover also) has been observed in regioregular chiral polythiophenes. magni…
The third‐order nonlinear optical susceptibilities, X (3) , of TeO 2 ‐based glasses containing transition metal oxides (M = Sc 2 O 3 , TiO 2 , V 2 O 5 , Nb 2 O 5 , MoO 3 , Ta 2 O 5 , and WO 3 ) glasses have been measured by the third harmonic generation (THG) method in order to investigate the effect of the empty d ‐o…
To evaluate the effect of surface treatment and surface microtexture on cellular behavior, smooth and microtextured silicone substrata were produced. The microtextured substrata possessed parallel surface grooves with a width and spacing of 2.0 (SilD02), 5.0 (SilD05), and 10 microns (SilD10). The groove depth was appr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Properties of Poly(acrylic acid)-Doped PolyanilineShow-An Chen and Hsun-Tsing LeeCite this: Macromolecules 1995, 28, 8, 2858–2866Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 1995https://pubs.acs.o…