Materials Literature
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Almost 30 years ago, when the study of chromonic liquid crystals was in its infancy, Alfred Saupe and L.J. Yu investigated disodium cromoglycate using deuteron magnetic resonance spectroscopy. Among their findings were that the quadrupolar splitting of the D2O spectrum increased with decreasing temperature and that th…
This paper presents an experimental study of the influence of steel basic oxygen slag (BOS) and ordinary portland cement (OPC) on the compressive strength and the hydration mechanisms of blended grounded granulated blast furnace slag (GGBS) pastes. The compressive strength, the mineralogical changes due to hydration,…
High density (2–5×1010 cm−2) self-organized InGaN/GaN quantum dots were grown by plasma-assisted molecular beam epitaxy. Room temperature photoluminescence shows that the quantum dots have strong emission ranging from 430 to 524 nm. The internal quantum efficiency of dots emitting at 500 nm was determined to be 32% by…
Scaling is a reference ‘key-word’ in engineering and in physics. The relevance of scaling in the water cooled nuclear reactor technology constitutes the motivation for the present paper. The origin of the scaling-issue, i.e. the impossibility to get access to measured data in case of accident in nuclear reactors, is d…
High atomic number (Z) materials such as gold preferentially absorb kilovoltage x-rays compared to soft tissue and may be used to achieve local dose enhancement in tumours during treatment with ionizing radiation. Gold nanoparticles have been demonstrated as radiation dose enhancing agents in vivo and in vitro. In the…
Organic semiconductor films are susceptible to noncovalent interactions, trapping and doping, photoexcitation, and dimensional deformation. While these effects can be detrimental to the performance of conventional circuits, they can be harnessed, especially in field-effect architectures, to detect chemical and physica…
Organically modified montmorillonite (OMMT) nanoparticles were obtained by hydrothermal reaction and then styrene—butadiene—styrene tri-block copolymer (SBS)/exfoliated montmorillonite nanocomposites were prepared by melt-compounding. The morphology of the OMMT nanoparticles was observed by field-emission scanning ele…
In this paper a study on the ion transmission ratio of a nanoporous alumina sample is presented. The sample was investigated by scanning transmission ion microscopy (STIM) with different beam sizes. The hexagonally close-packed Al(2)O(3) nanocapillary array, realized as a suspended membrane of 15 microm thickness, had…
We investigate the director reorientation in a nematic liquid crystal confined between two parallel plates and subjected to both a magnetic and an electric field. The permanent magnetic field is used first to align the director and, subsequently, to allow nuclear magnetic resonance (NMR) observation of the director re…
A simple method to determine the translational order parameter of a smectic liquid crystal is presented. It is based on a measurement of the absolute intensity of the first-order layer reflection from an unaligned (powder) sample using small-angle neutron scattering. The Lorentz factor and molecular form factor are us…
Twelve new five-ring bent-core compounds have been synthesised which are derived from 2-nitroresorcinol and which contain only ester linkage groups. Their mesophase behaviour was investigated by polarising microscopy, X-ray diffraction and electro-optical measurements. It was found that most of the compounds studied f…
The dual- and triple-shape effects of multiphase polymer networks that contain two crystallizable chain segments have been assessed in situ by combining X-ray measurements with thermomechanical investigations. The studied polymer, named CLEG, is a multiphase polymer network of crystallizable poly(ε-caprolactone) (PCL)…
In 2008, new classes of high-temperature superconductors containing iron have been discovered. These iron pnictides offer a new area of exploration and understanding of superconductivity. Quantum oscillations is a bulk probe that allows us to map out the full Fermi surface of a superconducting system in its normal met…
The transition from micro- to nanoscale systems brings major changes to the basic physicochemical properties of polymers. The polymers of elemental phosphorus (phosphorus-containing polymers [PCPs]) display this phenomenon, for example, in magnification of reactivity, changes of self-ignition temperature and of other…
We report on the large wavelength range and light-initiated thermal tuning of the reflection of a liquid crystal (LC) formulation (S811/ZLI-2806) near a smectic (SmA) to cholesteric (CLC) phase transition enabled by the use of a high order parameter heat transfer dye (anthraquinone, AQ). Upon irradiation with a 647 nm…
The complexes of rare earth elements with 2,3-naphthalenedicarboxylic acid of the formula: Ln 2 (C 12 H 6 O 4 ) 3 · n H 2 O, where Ln = La(III)-Lu(III) and Y(III); n = 3 for La(III), Ce(III); n = 6 for Pr(III)-Yb(III) and Y(III) and n = 5 for Lu(III) have been synthesized and characterized by elemental analysis, IR sp…
One of the first applications of the molecular field theory developed by Maier and Saupe (Maier W.; Saupe, A. Z. Naturforsch. 1958, 13a, 564–566) was to the static dielectric properties of a nematic liquid crystal by Maier and Meier (Maier, W.; Meier, G. Z. Naturforsch. 1961, 16a, 262). Then, in a paper published in 1…
In this work an attempt is made to compare and rationalise the structural and dynamic behaviour of some ferroelectric rod-like mesogens studied by our group in recent years, mainly by means of 2H- and 13C-nuclear magnetic resonance (NMR) spectroscopy. This comparison concerning the local orientational order, the avera…
The characterization of biodistribution is a central requirement in the development of biomedical applications based on the use of nanoparticles, in particular for controlled drug delivery. The blood circulation time, organ biodistribution and rate of excretion must be well characterized in the process of product deve…
In discussions of nanotechnology, it has become increasingly common to emphasise the importance of ‘responsible governance’. This study focused on the issue of environmental governance and was specifically interested in critically exploring the relationship between nature and nanotechnology. It began by characterising…