Materials Literature
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It is shown experimentally that the ketene dithioacetal group is very effective as an electron-donating group in the design and synthesis of thermally stable and efficient second-order nonlinear optical chromophores.
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Grain protein films plasticized with glycerol were prepared from corn zein (CZ), wheat gluten (WG), and a 2.3:1 mixture of wheat gluten and soy protein isolate (WG/SPI). Moisture adsorption curves of the three types of protein films at 25 C and within an approximate water activity range of 0.11 to 0.84 were obtained u…
Thiophene oligomers having a dithienylethene structure show large shifts in oxidation potential to the cathodic region in excess of 0.87–1.27 V by photocyclization.
Al-Pillared saponites have been prepared from natural Na-exchanged Ballarat saponite. Acidic properties of these saponites have been studied by IR spectroscopy using pyridine as a probe molecule. Al-Pillared saponites exhibit both Brønsted and Lewis acidity. Lewis sites are evidenced in the parent Na-exchanged clay as…
Abstract Models describing thermal motion and conformational variability in protein crystal structures were applied to the refinement of a 1.8 Å crystal structure of penicillopepsin. Three methods were tested: conventional refinement using restrained B factors, multiple‐conformer refinement, and time‐averaging refinem…
Unsymmetrically substituted triphenylenes can be obtained by the iron(III) chloride mediated oxidative coupling of a 3,3′,4,4′-tetraalkoxybiphenyl with a 1,2-dialkoxybenzene thus opening up a practicable route to polymeric discotic liquid crystals.
Chemical oxidation of aniline at the liquid/liquid interface of two immiscible solvents results in the growth of an electroactive polymer membrane that exhibits redox behaviour similar to conventional electrodeposited polyaniline.
Fine particles of cobalt and cobalt carbide nesting in multilayered graphitic sheets, which were synthesized by an electric arc discharge of carbon rods containing cobalt oxide (CoO), were studied by transmission electron microscopy, including microdiffraction and energy dispersive x-ray analysis. The size of the wrap…
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Abstract The oxidation of the leucoemeraldine (LM) and emeraldine (EM) states of polyaniline (PAN) and the subsequent reprotonation and reduction of the nigraniline (NA) and pernigraniline (PNA) in acid gold solution were utilized for the spontaneous and sustained reduction of gold. The rate of Au reduction is strongl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochromic and Photoelectrochromic Behavior of Thin WO3 Films Prepared from Quantum Size Collodal ParticlesSurat Hotchandani, Idriss Bedja, Richard Fessenden, and Prashant KamatCite this: Langmuir 1994, 10, 1, 17–22Publication Date (Print):January 1, 1994Publication Hist…
A new manganese(II) compound [Mn2(bipy)4(ta)][ClO4]21(bipy = 2,2′-bipyridme, ta = terephthalate dianion) has been synthesised and its crystal structure determined by single-crystal X-ray diffraction. It crystallizes in the triclinic system, space group P, with a= 9.516(2), b= 11.613(3), c= 11.615(3)Å, α= 70.92(2), β=…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvolution of order in thin block copolymer filmsA. M. Mayes, T. P. Russell, P. Bassereau, S. M. Baker, and G. S. SmithCite this: Macromolecules 1994, 27, 3, 749–755Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 Janua…
Abstract We investigated the effect of poly(ethylene‐co‐vinyl alcohol) (EVOH) concentration on the processability and physical properties of thermoplastic starch plasticized with glycerine and water. Waxy maize starch (Amioca), native corn starch (Melogel), and a treated high amylose corn starch (Hylon VII) were emplo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility and morphology of blends of isotactic and atactic poly(3-hydroxybutyrate)Hideki Abe, Yoshiharu Doi, Michael M. Satkowski, and Isao NodaCite this: Macromolecules 1994, 27, 1, 50–54Publication Date (Print):January 1, 1994Publication History Published online1 May 20…
Hot pressing kinetics of α‐Si 3 N 4 , AIN, Al 2 O 3 , and Y 2 O 3 powder mixtures forming α′‐ and β′‐SiAlONs have been studied. Densification proceeds in two steps, first by a small shrinkage upon ternary eutectic oxide melting (SiO 2 –Al 2 O 3 –Y 2 O 3 ) at 1340°C, followed by a massive particle rearrangement and fur…
A monoclonal antibody (mAb 4D9) was used to analyze engrailed expression in amphipod embryos. As in other arthropods, engrailed is expressed in iterated transverse stripes in the germ band. In the anterior region these stripes are generated without a recognizable division pattern, and their appearance and formation sh…
We present the results from a recent study of the structure and energies of the low-index surfaces of spinel (MgAl2O4) using atomistic simulation techniques. These illustrate the complexity of modelling the surfaces of ternary oxides, particularly since cation ordering, resulting in the formation of inverse spinel, pl…
Abstract The dynamic affinity adsorption oflysozyme through stacked flat‐sheet cellulose membranes with immobilized cibacron blue 3GA was studied and compared to three affinity‐membrane models: diffusion model to explore the importance of axial and radial diffusion; variation model to study the effects of pore‐size di…