Materials Literature
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A nonplasma technique, hot-filament chemical vapor deposition (HFCVD), is an alternative method for producing organosilicon films of novel structure. Films are deposited onto room-temperature substrates from the precursors hexamethylcyclotrisiloxane and octamethylcyclotetrasiloxane at high rates (>1 μm/min). Filament…
Dendron-stabilized gold nanoparticles synthesized with Fréchet-type dendrons possessing a single thiol group at the focal point have small cores (average diameters of 2.4–3.1 nm) with narrow size distribution and remarkably high stability; in particular, the nanoparticles synthesized with the second generation dendron…
The mesoporous siliceous SBA-15 molecular sieve was synthesized and post-synthesis alumination was carried out using trimethylaluminium (TMA). It was found that the aluminium could be easily incorporated into the siliceous framework of SBA-15 without serious structure deformation. From detailed characterization of the…
A linear coordination polymer composed of diarylethene and bis(hexafluoroacetylacetonato)zinc(II) has been synthesized and its photochromism in the single-crystalline phase studied by polarized absorption spectroscopy.
This contribution briefly introduces the traditional acceptor doping of oxides, charge compensated by oxygen vacancies to bring about the oxygen ion conduction utilised in solid oxide electrolytes. It is next shown how a simple defect–chemical approach to defect–defect interactions is a useful first-approximation tool…
LixNi0.30Co0.70O2 phases obtained by electrochemical deintercalation have been characterised by XRD, 7Li MAS NMR, electronic conductivity and thermoelectronic power measurements. Ni3+ oxidation to Ni4+ occurs at the onset of deintercalation, leading to Ni3+/Ni4+ hopping which causes an exchange of the 7Li NMR signals,…
Three-dimensional erasable optical recording in a single crystal of 1, 2-bis(3-methyl-2-thienyl)perfluorocyclopentene (1), which shows a reversible fluorescence change with the photochromic reaction, has been demonstrated. The recorded spot size read by a fluorescence-detection method was approximately 200nm in plane…
Ruthenium oxide films were grown on metal substrates at temperatures from 100 to 300°C using a ruthenium ethoxide solution as the precursor. The amorphous phase and highly porous ruthenium oxide films were formed at temperatures of 200°C and lower. A specific capacitance of 593 F/g and an interfacial capacitance of 4…
The CMR manganites Ln1 − xAxMnO3 with the perovskite structure form a very important family of magnetic oxides, studied for their fascinating colossal magnetotransport properties. In this review, we discuss two phenomena, charge ordering and phase separation, which are crucial for the appearance of CMR in these oxides…
Using vesicular polymerization, water-soluble polyelectrolyte nanocapsules have been prepared, that are able to undergo a reversible swelling transition upon changing the pH and/or salt concentration.
Polarization and dielectric constant for 2D media Maxwell displacement current method monolayers viewed as polar liquid crystals dielectric relaxation phenomena chiral phase separation nonlinear effects thermally-stimulated current electronic properties at MIM interfaces.
We have investigated Ti/Au (30/50 nm) ohmic contacts to The samples are annealed at temperatures of 300 and 500°C for 60 s in a flowing atmosphere. Current-voltage measurements show that the as-deposited sample is ohmic with a specific contact resistance of However, annealing of the sample at 300°C results in much bet…
Silicon-29 and carbon-13 NMR spectroscopy is employed to determine the structures of stable five- and six-coordinated organosilicon complexes formed by the addition of certain aliphatic acid carbohydrates (such as gluconic acid, glucoheptonic acid and saccharic acid) to aqueous alkaline silicate solutions.
Abstract The principles of photochemistry continue to fuel progress in luminescent sensors and photonic switches. Examples of sensors based on photoinduced electron transfer (PET) are discussed, including those which form the basis of successful systems used in physiology and medicine. More complex formats usually inv…
To control the growth of primary tumors effectively with systemic chemotherapy, we recently developed intravenously administered small-sized magnetic liposomes as an anticancer drug carrier. We previously reported that intravenously administered magnetic liposomes with incorporated adriamycin (magnetic ADR liposomes)…
A new family of discotic liquid crystals, potentially electron carriers, has been synthesised, some members of which exhibit a particularly rich thermotropic behaviour.
Reaction of an aqueous solution of Na2bpdc (H2bpdc = biphenyldicarboxylic acid) with an organic solution of Co(NO3)2via a diffusion route leads to a pillared three-dimensional structure in which the heterometallic sodium(I)–cobalt(II) trilayers are connected by carboxylate groups of the pillared ligand bpdc2−.
Combined interaction of triple hydrogen bonding, dipolar pi-pi aggregation and micro-segregation in a melamine-barbituric acid dye assembly leads to a columnar mesophase which could be characterized by optical polarising microscopy, differential scanning calorimetry and X-ray diffraction.
The structural stability and oxygen permeation properties of Sr 3 − x La x Fe 2 − y Co y O 7 − δ with 0 ⩽ x ⩽ 0.3 and 0 ⩽ y ⩽ 1.0 have been studied at high temperature ( 800 ⩽ T ⩽ 900 ° C ) and in the oxygen partial pressure range 10 − 5 ⩽ p O 2 ⩽ 0.21 atm. These phases have a perovskite-related intergrowth structure…
We report high pressure Raman studies on as-prepared, purified, and solubilized single-walled and aligned multi-walled carbon nanotubes. The pressure dependence of radial (R) and tangential (T) vibrational bands in these samples is measured and compared with the results from other studies. In single-walled nanotubes,…