Materials Literature
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Wet dispersion mechanism of manometer-sized silica powder was investigated in a verticaltype beads mill using fine zirconium oxide (zirconia) beads. Zirconia beads of various sizes were used to disperse coagulated silica powders in nanometer size. The dispersed particles were measured by TEM and a dynamic light scatte…
The ecological success of marine diatoms comes despite their unusual additional requirement for silicon, a nutrient that often limits their growth in the ocean. There may be, however, some physiological and ecological advantages to silicon limitation. A model of nitrogen and silicon metabolism in diatoms (Flynn et al.…
Removal of nitrogen oxides (NOx) using an ozonization and catalysis hybrid process was investigated. The role of the ozonization in the hybrid process is to increase NO2 content by oxidizing a part of NO, thereby leading to improving the performance of the catalytic reduction. It was found that the rate of the oxidati…
Various kinds of ZrO2-ZrW2O8 composite ceramics were successfully prepared by cosintering of ZrO2 and ZrW2O8 mixture with various ratios at 1200°C. The thermal expansion coefficient of the composite could be controlled from -9.6×10-6 K-1-8.2×10-6 K-1 by varying ZrO2/ZrW2O8 ratios and zero thermal expansion was observe…
The present paper summarises theoretical and experimental work undertaken to develop a hardfacing product designated '167Nb-S'. This material, which is based on the Fe-Cr-Nb-C system, was designed for cladding components subjected to severe abrasive wear by submerged arc welding. The work undertaken includes microstru…
Highly ordered mesoporous organosilica thin films containing functional organic terminal groups covalently bonded to the silica matrix were synthesized by co-condensation of tetraethylorthosilicate (TEOS) and organotriethoxysilane RSi(OEt)3 (R = Cl(CH2)3, CN(CH2)3) in the presence of cetyltrimethylammonium bromide (CT…
Weakly-agglomerated nanocrystalline (ZrO2)1−x(Sc2O3)x (x = 0.02–0.16) powders with high surface area (106–186 m2 g−1) and uniform particle size (5.7–9.5 nm) were synthesized by a two-step hydrothermal process in the presence of urea, and their complex phase evolution upon calcinations over 400–1400 °C were studied by…
Hydrogen evolution and absorption during Zn electrodeposition from zinc sulfate electrolytes containing polyethylene glycol (PEG), gelatin, and thiourea (TU) was studied using an electrochemical quartz crystal microbalance (EQCM). The results obtained indicate that PEG and gelatin act as inhibitors of hydrogen absorpt…
Abstract In order to develop a novel model to predict if a so called normal tetrahedral compound crystallizes in a wurtzite - or sphalerite superstructure type, the system Cu 3 AsS 4 –Cu 3 SbS 4 was reinvestigated. A solid solution series was prepared and the mixed crystals were characterized by powder X-ray technique…
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…