Materials Literature
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Abstract The water transport in microparticles of poly(2‐hydroxyethyl methacrylate) crosslinked with small amounts of ethylene glycol dimethacrylate was investigated as a function of time. Dynamic swelling curves were obtained and analyzed with a simple, empirical, exponential expression, where the exponent n indicate…
Reversible disruption and re-formation of micelles is observed by following the redox reaction of the redox-active micelles formed by the bromide salt of (11-ferrocenyl)undecyltrimethylammonium having a ferrocene moiety instead of the terminal methyl proton.
The chemical components of the Chinese crude drug "Pai-Wei, " dried root of Cynanchum atratum BUNGE (Asclepiadaceae), have been studied. Five new oligoglycosides named cynatratoside-A (3), -B (4), -C (6), -D (8), and -E (9) were isolated by column chromatography and their structures were determined on the basis of che…
Reprecipitated fibrils from collagen solutions assemble into aggregates often showing a remarkable twisted structure. We first observed these aggregates in collagen gels prepared to facilitate culture of epithelial cells. We verified that these structures form in the absence of cells and correspond to a process of sel…
The treatment of wool under anhydrous (non‐swelling) conditions with potassium tert‐butoxide dissolved in tert‐butanol was studied. The aim was to confine reaction with the alkaline reagent to the outer surface of the fibre, thus preventing whole‐fibre degradation. It appears that the a/koxide specifically reacts with…
The interaction of the reduced ‘blue solutions’ of ruthenium chloride in methanol with alkali-metal carboxylates yields the air-sensitive paramagnetic complexes, Ru2(µ-O2CR)4(R = H, Me, CH2Cl, Et, or Ph), that form weakly end-co-ordinated bis adducts, Ru2(µ-O2CR)4L2[L = H2O, MeOH, tetrahydrofuran (thf), Me2CO, or MeCN…
Fourier transform infrared spectroscopy was used to study the metal oxide/silane interface. Structures of γ-aminopropyldimethylethoxysilane (γ-APDMES) coupling agent on the surface of metal oxide powders are proposed. The structures depend on the surface characteristics of the substrate. The amine group of the silane…
The exact calculation of the reflection from single domain aligned samples of helicoidal liquid crystals (SmC* or cholesterics) is performed using the 4 x 4 matrix formulation of Maxwell equations in anisotropic media. We show that the expansion, approximation up to the 1st order of Berreman and Scheffer, is not adequ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSANS and SAXS studies on molecular conformation of a block polymer in microdomain spaceH. Hasegawa, Takeji Hashimoto, Hiromichi Kawai, Timothy P. Lodge, Eric J. Amis, C. J. Glinka, and Charles C. HanCite this: Macromolecules 1985, 18, 1, 67–78Publication Date (Print):January…
Two new example are reported of (quantitative) light-induced excited spin state trapping (LIESST) in coloured polycrystalline iron(II) spin-crossover compounds, with practically infinite lifetime of the high spine state below a critical temperature (25 and 55K, respectively); LIESST now appears to be a common effect f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of the [(OC)3Mn(cis-Nb2W4O19)]3- and [(OC)3Re(cis-Nb2W4O19)]3- anionsC. J. Besecker, V. W. Day, W. G. Klemperer, and M. R. ThompsonCite this: Inorg. Chem. 1985, 24, 1, 44–50Publication Date (Print):January 1, 1985Publication History Published online1…
This presents a simple framework for studying the basic properties of the broad class of organic charge-transfer solids. It is shown that many of the differences in behavior of these materials can be described and understood in terms of a single, physical variable: δEREDOX, the difference between the electrochemical o…
The Structural Design Concept. Mechanics of Aerospace Structures. Constitution of Aerospace Materials. Theory and Analysis of Aerospace Beams. Work and Energy Principles. Deformation and Force Analysis of Aerospace Structures. Introduction to Finite Element Stiffness Method. Appendix.
Polyaniline films give a photoresponse when dipped into an aqueous solution of electrolyte.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, molecular structures, and properties of two polar diruthenium(II,III) complexes of 2-hydroxypyridine and 2-anilinopyridineAkhil R. Chakravarty, F. Albert Cotton, and Derek A. TocherCite this: Inorg. Chem. 1985, 24, 2, 172–177Publication Date (Print):January 1, 198…
Research Article| January 01, 1985 Rb-Sr evidence for punctuated illite/smectite diagenesis in the Oligocene Frio Formation, Texas Gulf Coast JOHN P. MORTON JOHN P. MORTON 1Department of Geological Sciences, University of Texas at Austin, Austin, Texas 78712 Search for other works by this author on: GSW Google Scholar…
The crystal structure of bis (2,2':6',2"-terpyridine)iron(II) bis ( perchlorate ) hydrate has been determined by single-crystal X-ray diffractometry . The compound is monoclinic, space group P21, with two molecules in a unit cell of dimensions a 8.830(3), b 8.914(1), c 20.037(6)?, ß 100.82(1)°. The structure was refin…
We report optical observations of a number of main-chain thermotropic liquid-crystal polymers. In situ measurements were carried out at elevated temperatures using an apparatus that is capable of providing a controlled translational oscillatory shearing motion to samples of typically 1–10 µm thickness. In static sampl…
The potential of sulphur-33 n.m.r. spectroscopy for chemical applications is explored. Data are presented for a range of compounds. Spectra have been obtained using both high-power and high-resolution systems. Moderately high field strengths were used (7.05 and 4.70 T), together with a special pulse sequence to reduce…
Synchrotron X-ray measurements are performed in both uniaxial (discotic and calamitic) and biaxial nematic lyomesophases of the mixture K-laurate, 1-decanol and D2O. A first-order band and a second-order band with spacing ratio 1 : 2 characteristic of a pseudo-lamellar structure are observed in the three nematic phase…