Materials Literature
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Electrochemical and theoretical investigations demonstrate through-bond interactions between two TTF moieties fused to a 1,4-dihydro-1,4-diphosphinine, for which the single crystal X-ray structure of the cis isomer is described together with that of a mixed-valent, charge-localized, radical cation salt with Mo6O19(2-)…
In this paper, thermal conductivity of porous silica film with porosity from 21 to 64% was studied comprehensively. The corresponded dielectric constant is from 2.5 to 1.5. It is observed that the porous silica material has strong anisotropic characteristic. A serial-parallel hybrid model is proposed to explain the co…
Synthesis, characterization, ionic conductivity, electrochemical stability, and lithium-ion transport number of an asymmetric version of the successful orthoborate lithium salt lithium bis(oxalato)borate (LiBOB), are described. The salt, lithium (malonato oxalato) borate (LiMOB), is thermally stable up to 273°C. It is…
The photosensitivity to 248nm excimer laser radiation of Er-doped Schott IOG-1 phosphate glass is presented. The photosensitive mechanism is investigated by employing a grating recording process. Index changes of up to ~2.0x10(-3) were measured in silver ion-exchanged samples using diffraction efficiency measurements;…
SYNOPSIS Using a three-dimensional raytrace technique, a model to optimise the design of Quantum Dot Solar Concentrators for photovoltaic applications has been developed. The model includes reflection, refraction and absorption of solar radiation allowing the prediction of the optical efficiency. The optical efficienc…
In this paper we describe a method for transferring semiconductor quantum dots, produced in non-polar solvents by an organometallic approach, into sol–gel matrices. ZrO2–SiO2 hybrid sol–gel glass films have been homogeneously doped with different semiconductor quantum dots (CdSe, CdSe@CdS and CdSe@ZnS). Both the absor…
The self-assembly of diaminododecane solubilised by different dendritic peptides, possessing increasing levels of dendritic branching, was investigated. The dendritic peptides were based on l-lysine building blocks and were of first, second and third generation, containing one, three and seven amino acid repeat units…
Exchange of the chloride anion intercalated in [LiAl2(OH)6]Cl.nH2O with a range of surfactants is reported. Attempts to delaminate (or exfoliate) the surfactant-exchanged intercalates, where the surfactant was an alkyl sulfate, were unsuccessful. In contrast, delamination of the layered double hydroxides [LiAl2(OH)6][…
The UV absorption spectra of 2,3-didecyloxyanthracene (DDOA) recorded in methanol, ethanol, 1-propanol, acetonitrile and methylcyclohexane reveal interesting features: they show a striking contrast between the isotropic solution and the gel state where, at ambient temperature, a fine structure appears with an apparent…
Efficient epoxidation, in very high conversions and selectivities, of aromatic hydrocarbons with hydrogen peroxide, in the presence of Mn(III) porphyrins [Mn(TDCPP)Cl, Mn(beta NO(2)TDCPP)Cl, Mn(TPFPP)Cl] as catalysts is described; naphthalene and anthracene afford the anti-1,2:3,4-arene dioxides whereas with phenanthr…
A novel type of additives for improving cathode cyclability has been developed. Three electrolyte additives, biphenyl (BP), o -terphenyl (OT), and m -terphenyl (MT) have been investigated for improving the cyclability of cathode materials like LiCoO 2 and LiMn 2 O 4 . The effect of these additives is correlated to the…
Amyloid-like fibrils formed from de novo designed short peptides, made up a nanoscale scaffold on which streptavidin was arranged in a regular spacing, potentially allowing the development into an array technology utilizing bio-nanoconstructs.
Abstract Fluorinated polymers form an interesting class of materials with a wealth of unique properties including self‐assembly, remarkably low surface energies, low absorbance to 157 nm UV light, and solubility in supercritical carbon dioxide. As a result many fluorinated polymers are of use in advanced technology ap…
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…