Materials Literature
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Voltage/temperature phase diagrams of liquid-crystalline blue phase (BP) systems CB 15/M 18 and CB 15/E 9 have been determined by means of polarizing microscopy. Above a certain threshold voltage a field-induced BP occurs which is stable in a region of the U/T diagram between the BPI and BPII.
The effects of adsorbed macromolecules (polymers) on certain transport coefficients of spherical particles are determined using methods of matched asymptotic expansions to solve the Stokes flow equations within and outside the polymer layer. The main advantage of this analysis is that it allows direct substitution of…
A long-period stacking structure of 9R, which has the stacking order ABC/BCA/CAB, has been found in ultrafine cobalt particles 20–500 nm in diameter. The structure seems to have resulted from the martensitic transformation of f.c.c. cobalt on cooling to room temperature. Electron microscopy reveals the existence of he…
Abstract Vertisols and Mollisols have developed from Quaternary pyroclastic deposits in central El Salvador under ustic moisture and isohyperthermic temperature regimes. Pellusterts generally occupy the nearly level constructional landforms (alluvial plains, coastal plains, and concave alluvial toeslopes), are poorly…
Abstract Gegenstand der Arbeit ist die Synthese von M etall s ilicat h ydraten (MSH) mit Schichtstruktur durch hydrothermale Kristallisation im ternären System M 2/n OSiO 2 H 2 O (M = Li, Na, K, Ca, Mg). Die erhaltenen Produkte, die Natriumsilicathydrate Ilerit, Magadiit und Kenyait und ein Kaliumsilicathydrat sind…
The electron-spin-resonance (ESR) linewidth and line shape for the quasi-two-dimensional organic metals \ensuremath{\beta}-(BEDT-TTF${)}_{2}$X [BEDT-TTF is bis(ethylenedithiolo)tetrathiafulvalene, ${\mathrm{C}}_{10}$${\mathrm{H}}_{8}$${\mathrm{S}}_{8}$, and X is ${\mathrm{I}}_{3}$ or ${\mathrm{IBr}}_{2}$] are examined…
Abstract The particle morphology and percent grafting were investigated as a function of the crosslink density of the seed latex in two systems of core/shell latexes of polybutadiene/polymethyl methacrylate (PB/PMMA) and styrene–butadiene rubber/polymethyl methacrylate (SBR/PMMA) prepared by seeded emulsion polymeriza…
Abstract Four different polyimides have been studied by thermogravimetry to ascertain their relative thermal stabilities in both inert and oxidising atmospheres. Experiments have been carried out at a rate of temperature rise of 2°C min −1 and isothermally at a number of temperatures in order to calculate overall acti…
Abstract In summary, the solid state C-13 NMR technique has proven to be a significant method for the detection of crosslinks and other structural modifications in accelerated sulfur-vulcanized NR systems. When the amount of accelerator is high in proportion to the amount of sulfur used, the network structure appears…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocal conformation of polysaccharides in solution investigated by small-angle x-ray scatteringYoshio Muroga, Yasunori Yamada, Ichiro Noda, and Mitsuru NagasawaCite this: Macromolecules 1987, 20, 12, 3003–3006Publication Date (Print):May 1, 1987Publication History Published o…
${\mathrm{FeSn}}_{2}$ is a collinear antiferromagnet between ${T}_{N}$=378 K and ${T}_{t}$=93 K as shown by previous neutron diffraction and $^{119}\mathrm{Sn}$ M\"ossbauer studies. Below ${T}_{t}$, two different noncollinear antiferromagnetic structures are consistent with neutron diffraction results, one, called str…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility and phase separation in poly(vinyl methyl ether)/poly(bisphenol A hydroxy ether) blendsC. Uriarte, J. I. Eguiazabal, M. Llanos, J. I. Iribarren, and J. J. IruinCite this: Macromolecules 1987, 20, 12, 3038–3042Publication Date (Print):May 1, 1987Publication Histor…
It has been confirmed by impedance and polarization measurements that the adsorption behavior of polar organic compounds on anodically polarized nickel electrode in 3.0 M HClO 4 are closely related to the HSAB principle. The compounds used as corrosion inhibitors were those of which polar atoms were elements of the 5B…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation between crystallinity and ethylene content in LLDPE and related ethylene copolymers: demonstration of the applicability of a simple empirical relationshipDavid R. BurfieldCite this: Macromolecules 1987, 20, 12, 3020–3023Publication Date (Print):May 1, 1987Publica…
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The dynamic properties of a V 2 O 5 ECD cell prepared by the sol-get method are mentioned. The V 2 O 5 thin film was electrochemically deposited onto ITO glass from a poly-vanadic acid sol. The response time of the ECD cell was 2–20 seconds, depending upon the cell voltage. The repeating time was more than 8×10 4 time…
The genes ptsI and ptsH, which encode, respectively, enzyme I and Hpr, cytoplasmic proteins involved in the phosphoenolpyruvate:sugar phosphotransferase system, were cloned from Bacillus subtilis. A plasmid containing a 4.1-kilobase DNA fragment was shown to complement Escherichia coli mutations affecting the ptsH and…
The binding of calcium and terbium to purified chick vitamin D-dependent intestinal calcium-binding protein was studied by terbium fluorescence, circular dichroism, and intrinsic protein fluorescence techniques. Calcium-binding protein bound, with high affinity, at least 3 mol of terbium/mol of protein; numerous low a…
An analysis has been developed to describe the rate of drainage of an axi-symmetric plane-parallel foam and emulsion films associated with bubble-bubble and drop-drop coalescence phenomena. The present analysis extends the earlier work of Zapryanov et al(1983) and of others which was limited to the diffusion controlle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of large cationic transition-metal-gold clusters by fast atom bombardment mass spectroscopy (FABMS). New rhenium-gold and platinum-gold clusters: [Au4Re(H)4[P(p-tol)3]2(PPh3)4]+, [Au2Re2(H)6(PPh3)6]+, and [Au6Pt(PPh3)7]2+Paul D. Boyle, Brian J. Johnson, Bruc…