Materials Literature
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Redox cycling of self-assembled polyelectrolyte multilayers, consisting of well-defined water-soluble electronically conducting poly-3-(3′-thienyloxy)propyltriethylammonium (P3TOPA) and insulating PSS (poly(sodium-4-styrenesulfonate)) on indium–tin oxide (ITO) electrode, or poly-3-(3′-thienyloxy)propanesulfonate) (P3T…
This paper presents a 3-dimensional biomechanical model of human body that consists of three layers different mechanical properties, namely the skin, soft tissue and bone. Based on the theory of contact mechanics and analyzing the contact characteristics between the deformable human body and a garment, we simulate the…
The unsymmetrical tridentate benzimidazole-pyridine-carboxamide units in ligands L1-L4 react with trivalent lanthanides, Ln(III), to give the nine-co-ordinate triple-helical complexes [Ln(Li)3]3+ (i = 1-4) existing as mixtures of C3-symmetrical facial and C1-symmetrical meridional isomers. Although the beta13 formatio…
The manganese(III) complex—carboxylate-[N,N′-bis(salicylaldehyde)cyclohexanediaminate]manganese(III), [Mn(salhd)CH3COO]—was encapsulated into an aluminium pillared clay (denoted as Al-WYO) using a two-step liquid phase methodology: (i) adsorption of manganese(II) acetate in ethanolic solution within Al-WYO, followed b…
Abstract The structure of a selection of arsenate‐and sulphate‐based minerals of the tsumcorite group was studied by the combination of Raman and infrared spectroscopy. A comparison is made with the sulphate‐bearing mineral natrochalcite. Isomorphic substitution of sulphate for arsenate is observed for gartrellite and…
Crystals of δ‐Y 2 Si 2 O 7 (space group P 12 1 / c 1) were examined using high‐temperature powder X‐ray diffractometry to determine their unit‐cell dimensions from 296 to 1473 K. The lattice deformation induced by thermal expansion was investigated using matrix algebra analysis to determine the directions and magnitud…
The present study compares castability and mechanical performance among alloys of c.p. Ti, Ti-6Al-7Nb and a newly-developed Ti-15Mo-1Bi in regard to their as-cast state. Experimental results indicate that average cast length of Ti-6Al-7Nb appears a little lower than c.p. Ti and Ti-15Mo-1Bi, although the differences ar…
A new genus, Talaroneis Kooistra & De Stefano, gen. nov. and a new species T. posidoniae Kooistra & De Stefano, sp. nov. are described. The elongate cells, which were found on a leaf of Posidonia oceanica, formed star-, zigzag- or ribbon-shaped colonies in culture. The distinctive character of T. posidoniae was the pr…
Chemical (electroless) deposition of silver oxysalts such as Ag 7 NO 11 × 3 Ag 2 SO 4 and Ag 7 NO 11 as powders or on a textile, i.e. , high density polyethylene is investigated. The process is based on a reaction between AgNO 3 , a source of Ag(I) ion, and ( NH 4 ) 2 S 2 O 8 or K 2 S 2 O 8 used as oxidizing agents of…
A range of novel starch based graft composites with synthetic polymers were prepared. These exhibit high surface areas as well as excellent thermal stabilities and useful wetting properties.
Remarkable room-temperature liquid crystallinity is observed for a wide range of metal soaps. Incorporation of saturated, mid-chain mono-methyl branched C17 fatty acid (mid-chain branched fatty acid) into metal soaps lowers the liquid crystalline transition to below room temperature. Soaps of Na, Mg, Al, Ca, Cu, Zn, S…
Lyotropic nematic textures are investigated, by image processing, near the reentrant isotropic (IRE)–discotic nematic (ND)–biaxial nematic (NB)–clamitic nematic (NC)–isotropic (I) phase transitions in a lyotropic mixture of potassium laurate, decanol, and D2O. The (NB), intermediate phase between the two uniaxial nema…
The thermolysis reaction of a dual precursor system, comprising one that promotes a controlled nucleation event to produce a rod-shaped nanocrystal template, and the other introduced through a subsequent series of injections that maintain the reaction under kinetic drive, is shown to provide a means of controlling gro…
Two complexes of divalent samarium have been synthesized by electrochemical reduction in methanol-tetrahydrofuran solutions: [Sm(18-crown-6)(ClO4)2] and [Sm(15-crown-5)2](ClO4)2. In [Sm(18-crown-6)(ClO4)2] the metal cation is ten-coordinate and its coordination sphere comprises six oxygen atoms of the crown ligand and…
Ia3d cubic mesoporous silica with unusual thermal stability has been synthesized using cetyltrimethylammonium bromide (CTAB) and sugar surfactant dodecyl-beta-D-maltoside (DM) as co-templates.
Advance in understanding glass transition dynamics is made by identifying (1) the “universal” Johari‐Goldstein (JG) relaxation with the primitive relaxation of the coupling model and (2) the nearly constant loss (NCL) as the short time caged dynamics, all with support from experimental data. Dynamics proceeds with tim…
This paper summarizes 2-1/2 decades of full-scale aircraft and rotorcraft crash testing performed at the Impact Dynamics Research Facility (IDRF) located at NASA Langley Research Center in Hampton, Virginia. The IDRF is a 240-ft.-high steel gantry that was built originally as a lunar landing simulator facility in the…
The oxygen storage capacity (OSC) of a ceria-zirconia(CeO2-ZrO2) solid solution containing 50 mol% ZrO2 is approximately 400 μmol-O2/g, which corresponds to approximately 50% of the theoretical OSC limit calculated from the valence change of the Ce ion. There are two possible explanations for the OSC suppression of ap…
Riboflavin, an essential cofactor for all organisms, is biosynthesized in plants, fungi and microorganisms. The penultimate step in the pathway is catalyzed by the enzyme lumazine synthase. One of the most distinctive characteristics of this enzyme is that it is found in different species in two different quaternary s…
We report studies of ordered microporous and nanoporous polymer films formed by the evaporation of polymer solutions following exposure to a humid atmosphere. High speed microphotographic (HSMP) studies of the formation process showed that near the surface of the polymer solution, vapour condensation produced near mon…