Materials Literature
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Photochromism of a series of 1′-alkyl-3′,3′-dimethyl-6-nitro-8-alkanoyloxymethylspiro(2H-1-benzopyran-2,2′-indoline) derivatives (SPs) having different lengths of their alkyl chains has been investigated in didodecyldimethylammonium chloride–clay matrices; stable H (parallel type) and J (head-to-tail type) aggregates…
Abstract
Previously, we examined the imino proton relaxation of d(GGAATTCC) in order to characterize salt and polyamine effects on the base-pair opening kinetics of this oligonucleotide [Braunlin, W. H., & Bloomfield, V. A. (1988) Biochemistry 27, 1184-1191]. Here, we report salt-dependent measurements of the NMR behavior of t…
The surface viscosity of beer was investigated using rotational surface viscometry to obtain information on its role as a factor in beer foam stability. Beer proteins were also studied in relation to surface viscosity, adsorption onto air bubbles, surface tension, and foamability in order to reveal the effects of the…
Six major types of isotope separation methods which involve plasma phenomena are discussed. These methods are: plasma centrifuge, AVLIS (atomic vapor laser isotope separation), ion wave, ICR (ion cyclotron resonance), calutron, and gas discharge. The plasma phenomena in these major categories are described. An attempt…
Abstract The wash performance of three specific proteases (asp, lys/arg and glu specific, respectively) is demonstrated to be comparable to that of commercial unspecific detergent proteases (Alcalase® and Savinase®). A hypothesis for the high performance of these specific proteases is proposed. The influence of pH and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilanization of radio frequency glow discharge modified expanded poly(tetrafluoroethylene) using (aminopropyl)triethoxysilaneDaniel J. Hook, Terrence G. Vargo, Joseph A. Gardella Jr., Kevin S. Litwiler, and Frank V. BrightCite this: Langmuir 1991, 7, 1, 142–151Publication Da…
Pointing out electron acceptor properties of viologens, the outlines of porphyrin-viologen systems, complexes of viologens with donors and polymeric viologens are described along with biological interest of viologens
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of a new oligomer of glutaraldehyde produced by aldol condensation reactionToshio Tashima, Masahiro Imai, Yoshihiro Kuroda, Shigemasa Yagi, and Terumichi NakagawaCite this: J. Org. Chem. 1991, 56, 2, 694–697Publication Date (Print):January 1, 1991Publication Histor…
Fourier-transform mid-infrared (FTIR) and near-infrared (NIR) spectroscopies have been used to investigate the effects of thermal history on the bulk and surface structure of monolithic silica gels and glasses prepared by the sol–gel route. Effective dehydroxylation occurs above 700 °C with consolidation of the bulk s…
Cocondensation of scandium vapour with 1,3,5-tri-tert-butylbenzene affords the first example of a scandium(0) complex, the sandwich compound bis(η-1,3,5-tri-tert-butylbenzene)scandium; ESR and UV studies also the reveal the presence of a second compound from this reaction, formulated as a similarly unique example of s…
Abstract Partially acetylated cellulose was synthesized by homogeneous acidic and basic saponification of cellulose triacetate (fully acetylated cellulose) and by homogeneous acetylation of cellulose dissolved in molten N ‐ethyl‐pyridinium chloride. The result of 1 H NMR spectroscopic investigations was that acetylati…
An active catalyst for carbon dioxide hydrogenation is obtained by exposing an amorphous Au25Zr75 alloy to CO2 hydrogenation conditions. During this in situ activation, metallic gold particles of 8.5 nm mean size are formed, and the zirconium component of the catalyst is oxidized to ZrO2. For comparison, a further Au/…
Bagasse fiber was acetylated with acetic anhydride alone to various levels of acetyl weight gain. Acetylation causes the bagasse fiber to become more hydrophobic, as evidenced by a lowering of the equilibrium moisture content as the level of acetylation increased. Acetylated bagasse fiber and fiberboards made from ace…
The use of organosilanes as adhesion promoters for surface coatings, adhesives and syntactic foams is described and reviewed in the light of published work. Data are presented on the beneficial effect of silanes, when used as pretreatment primers and additives, on the bond strength of two pack epoxide and polyurethane…
The hydrolysis of alkoxysilane coupling agents has been followed using proton NMR. The disappearance of the silane ester and the appearance of the alkoxy group were observed to follow pseudo-first-order kinetics. The apparent rate constant was found to be dependent on the concentration of the silane coupling agent and…
The zero-temperature energies and equilibrium volume expansions of point-defect-free asymmetrical grain boundaries (GBs) in bcc metals are determined using both a many-body potential fitted for Mo and a Johnson-type pair potential spline-fitted for α-Fe. The asymmetrical combinations of lattice planes considered invol…
Scattering has often been regarded as a problem in all aspects of medical radiation physics. The contribution of scatter to radiotherapy beams causing increased penumbra, the production of staff doses during diagnostic X-ray procedures or the contribution of scatter to image degradation in radiology have all been cite…
The phase-transition behaviour of mixtures of liquid crystals (LCs) and photochromic spiropyran derivatives, induced by isomerization of the guest molecules, has been investigated. Two types of spiropyran derivatives were employed: normal spiropyrans which are stable in the closed form (spiropyran form; SPF) and open-…
In the dark, both photochromic forms of co-polymer 1 (R = H, CH3; R1 = CN, OCH3) are indefinitely stable at room temperature. In combination with their mesomorphic properties, this stability makes these materials interesting for optical information storage.