Materials Literature
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Changes in supramolecular assembly of matrix, specifically collagen, have important functional consequences, especially for tissues requiring high mechanical strength. Thus modulation of collagen assembly could be used as a therapeutic intervention or to control the development of tissue-engineered constructs containi…
The US Department of Energy's National Renewable Energy Laboratory (NREL) has developed an integrated heat exchanger/thermoelectric power system analysis tool (in Matlab/Simulink environment) that simultaneously analyzes and optimizes the integrated effects of heat exchanger and thermoelectric power generator (TEPG) p…
A unique structure: In the crystalline state the lanthanum copper sulfide La2CuS4 comprises discrete anion triples. These are composed of almost planar triangular [CuS3]5− units, which consist of Cu+ and S2− ions linked through a −SS−-dumbbell to form the [S3Cu⋅⋅⋅SS⋅⋅⋅CuS3]12− anion (see picture).
We study the emergence of a cross-over from entropically driven to thermally activated dynamics in different versions of the 'entropic' phase space model introduced by Barrat and Mézard, and previously considered in the zero temperature limit. We first focus on the low temperature ( T ⩽ T g ) ageing phase of the origi…
The dynamics of E92B18 (E=OCH2CH2: oxyethylene, B=OCH2CH(C2H5): oxybutylene; the subscripts are the number of repeats) block copolymer micelles is investigated by neutron spin-echo (NSE). The dynamics of chains in E92B18 micelles is investigated in the hard gel and soft gel phases of the E92B18 in D2O, as well as in t…
We have measured the thermoelectric power of several germanium single crystals with different isotopic compositions: natural, 96.3%, and 99.99% enriched ${}^{70}\mathrm{Ge}.$ N- and p-type Ge samples with the net concentration of electrically active impurities $<2\ifmmode\times\else\texttimes\fi{}{10}^{13}{\mathrm{…
The metal-insulator transition in VO2 was investigated using the three-band Hubbard model, in which the degeneracy of the 3d orbitals, the on-site Coulomb and exchange interactions, and the effects of lattice distortion were considered. A new scenario on the phase transition is proposed, where the increase in energy l…
The conventional worldwide accepted method of computerized glow curve deconvolution based on the general order kinetics formalism has two fatal defects in systems where the trapping levels (two or more) have non-zero retrapping probability. The first one is ignoring the thermal connectivity between thermoluminescence…
The development of economic thermoelectric generators for waste heat recovery has become an increasing research focus over the past a few years. Traditionally, attempts to improve their economic viability have concentrated primarily on improving the conversion efficiency by increasing the figure-of-merit of thermoelec…
The adsorption of highly charged flexible polycations and polyanions on a charged cylindrical substrate is investigated by means of Monte Carlo simulations. A detailed structural study, including monomer and fluid charge distributions, is provided. The influence of a short-range attraction between the polycation and n…
Conjugation of dextran-coated superparamagnetic iron oxide (SPIO) particles with transactivator protein (Tat)-peptide and fluorescein isothiocyanate (FITC) allows cells to readily uptake SPIO particles. This makes possible high-resolution, real-time imaging of these cells by magnetic resonance imaging (MRI). First, we…
Thermoelectric generators with combustion heat sources are being developed for the US Army, TACOM-ARDEC, by Hi-Z Technology, Inc., for battery replacement in the field and for powering lightweight portable battery chargers. These small generators range in output power from 0.3 Watts to 20 Watts. The main thrust of the…
We analyse the relaxational dynamics of a system close to a saddle of the potential energy function, within an harmonic approximation. Our main aim is to relate the topological properties of the saddle, as encoded in its spectrum, to the dynamical behaviour of the system. In the context of the potential energy landsca…
A novel stable organic radical, 2-(5-azaindol-2-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1 H -imidazoline-1-oxyl-3-oxide ( 3 ), forms a two-dimensional brick-wall architecture based on hydrogen bonding and π-stacking. Low-temperature magnetization curves revealed an S-shaped dependence on the applied field below ca. 3.0 K,…
Successive structural phase transitions with ferroelectricity were found in TlCoCl 3 through dielectric constant measurements and D – E hysteresis loop observations. The sequence of the transitions is identical with that in RbMnBr 3 and TlFeCl 3 , which undergo successive transitions from the prototype crystal structu…
We present measurements of the wavelength-dependent reflectivity of a subwavelength metal hole array on a glass substrate. We compare the observed resonant structures with those found in transmission and note a nonreciprocity under illumination from the air versus the glass side. This can be used to verify on which in…
Magnetoabsorption spectra of a layered compound GaSe have been measured both for the Faraday and for the Voigt configurations with magnetic fields up to 150 T. Interband transitions between the Landau subbands have been clearly observed for the Faraday configuration. The exciton exhibited a diamagnetic shift, from whi…
This paper describes the comparison of operating point control methods such as maximum power point tracking control (MPPT) and a constant voltage control applied to the thermoelectric devices. To experimentally evaluate the power control methods, a one-chip micro controller controlled DC-DC converter was inserted betw…
It is well known that power generation efficiency improves when materials with appropriate properties are combined either in a cascaded or segmented fashion across a temperature gradient. Past methods for determining materials used in segmentation were mainly concerned with materials that have the highest figure of me…
A dopant-induced anomalous increase in the helical pitch of dicholesteryl 10,12-docosadiynedioate 1 is explained by generation of smectic clusters in the cholesteric phase where the dopants act as promoters of smectic domains. The dopants, having a mesogenic core and the proper length of alkyl chains on both their mol…