Materials Literature
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Two chiral bent-core mesogens (P7-O-PIMB5*, P6-O-PIMB4*) have been synthesized in addition to P8-O-PIMB6*, that is known to exhibit a stable ferroelectric phase, and their phase structures studied in order to clarify the effect of the interlayer steric interaction on the emergence of a ferroelectric ordering. Second h…
The unprecedented template action of ytterbium ion in the synthesis of pentaaza macrocyclic Schiff bases is exemplified by isolation and definitive identification of the seven-coordinate pentagonal bipyramidal complex with the formula of [YbLCl(2)]ClO(4) (1), where L is 2,14-dimethyl-3,6,10,13,19-pentaazabicyclo[13.3.…
A new direct write 3D nano lithographic technique has been developed at the Centre for Ion Beam Applications (CIBA) in the Physics Department of the National University of Singapore. This technique employs a focused MeV proton beam which is scanned in a predetermined pattern over a resist (e.g. PMMA or SU-8), which is…
An intermediate-temperature solid electrolyte fuel cell has been developed that employs a proton-conducting solid electrolyte and uses ammonia directly as the hydrogen-containing fuel. Preliminary tests demonstrate that Gd-doped barium cerate is a suitable electrolyte material for a direct ammonia fuel cell operating…
Most of the chick body is covered with feathers, while the tarsometatarsus and the dorsal face of the digits form oblong overlapping scales (scuta) and the plantar face rounded nonoverlapping scales (reticula). Feathers and scuta are made of beta-keratins, while the epidermis of reticula and inter-appendage or apteria…
Complexation of 2,8-diethyl-1,3,7,9-tetramethyl-5-(2-pyridyl)-dipyrromethene with zinc(II) generated an unprecedented structural motif for a dipyrromethene ligand, of formula Zn2(dipyrromethene)2X2, where X represents a coordinated anion.
Predominantly NO-centered reduction was observed by EPR and IR spectroelectrochemistry to occur reversibly at low temperatures for [Cl(5)Ir(NO)](-). In contrast, the [Cl(5)Ru(NO)](2-) ion was found to undergo only irreversible reduction but reversible oxidation to a ruthenium(III) species at -40 degrees C. DFT calcula…
Recent rapid progress in nanotechnology has focused research and development efforts on new high performance materials. Organic-inorganic hybrid materials such as nylon-layered silicate nanocomposites have attracted special interest and various studies continue to be conducted on thermoplastic resins.In this study, we…
Plain and fretting fatigue properties of β type titanium alloy, Ti-29Nb-13Ta-4.6Zr, underwent various thermo-mechanical treatments were investigated in order to judge its potential for biomedical applications. Ti-29Nb-13Ta-4.6Zr aged directly at 723 K for 259.2 ks after cold rolling shows the greatest fatigue strength…
A functionalized monomer based on 3,4-propylenedioxythiophene, namely ProDOT-OH, was synthesized easily in a single step from commercially available starting materials and was successfully polymerized electrochemically resulting in the formation of an electroactive conjugated film on the working electrode. The presenc…
A nano fabrication process using caesium chloride in an island lithography scheme has been used to make wells in a silicon dioxide layer on silicon. Silver structures have been made in these wells using an electroless process that involves the reduction of silver ions and oxidation of silicon in the presence of fluori…
Semiconducting nanoparticles of indium and thallium oxides (In2O3 and Tl2O3) have been successfully synthesized in high yield (>95%) by microwave irradiation. The oxides are synthesized in a simple domestic microwave oven (DMO) by adding an aqueous ammonia solution to the aqueous solutions of indium chloride (InCl3) a…
Selecting thermoplastics for a wide industrial application (automotive, appliances, lawn and garden, power tools, etc.) strongly depends on the plastic material composition, part design, processing (molding and welding) conditions. The structure of used thermoplastics, mechanical properties and composition (reinforcem…
Introduction of a long alkoxy chain at an sp3 carbon of the ethylenedioxy bridge of EDOT induces a large increase of the band gap of the resulting polymer.
Pores arranged in a two-dimensional hexagonal structure inside spherical mesoporous silica particles help to prevent the thermal sintering of gold nanoparticles compared to straight pores in MCM-41.
The emission and excitation spectra of single crystals of doped with and were measured with the aim to determine the location of the lanthanide energy levels relative to the valence and conduction band of the host crystal. By combining energies known for charge transfer bands involving trivalent lanthanides with syste…
Porous iron whose long cylindrical pores are aligned in one direction has been fabricated by unidirectional solidification of the melt in a mixture gas of hydrogen (nitrogen) and argon. Both hydrogen and nitrogen saturated in the molten iron are rejected at the solid–liquid interface during the solidification due to t…
The purpose of this study was to evaluate the effects of the silane coupling agent amount on the flexural properties and hydrolytic durability on an experimental composite resin for understanding the optimum amount of silanation. A spherical filler was silanated with 7 different amounts of gamma-MPTS, 0, 0.17, 0.34, 0…
La-modified bismuth titanate ceramics with compositions of Bi4−xLaxTi3O12 (x = 0, 0.2, 0.5, 0.75) were fabricated using powders prepared by a hydrolysis method. It was found that the partial substitution of lanthanum for bismuth in the Bi4Ti3O12 lattice significantly influenced the crystallization behavior, IR charact…
The first three chiral dodecamanganese clusters that behave as single-molecule magnets are reported. All reveal natural optical activity, which is stronger for the 2-chloropropionate derivative than for either the (S)-6-methoxy-α-methyl-2-naphthaleneacetate or the (S)-2-phenylbutyric acetate compounds. For the cluster…