Materials Literature
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The phase transition induced by pressure in the PbS and HgS nanocrystals was studied by in situ high pressure X-ray powder diffraction measurements. PbS underwent a phase transition from B1-B16 at 7 GPa whereas no transition was observed in HgS up to 15 GPa. The transition remained unaltered on the release of pressure…
A convenient sonochemical route was developed to fabricate one-dimensional (1D) CdS or CdSe assemblies via a simple template method with two-steps: Firstly, the colloid one dimensional cadmium hydroxide particles were prepared as templates under sonication; then, the colloid particles were converted into 1D CdS or CdS…
Abstract The formation energy of the mono-vacancy and both the formation energy and binding energy of the di-and tri-vacancy in BCC alkali metals and transition metals have been calculated by using the modified analytical embedded-atom method (MAEAM). The formation energy of each type of configuration of the vacancies…
We present experimental results for spinodal decomposition in polymer mixtures of gelatin and dextran. The domain growth law is found to be consistent with t 1/4 growth over extended time regimes. Similar results are obtained from lattice simulations of a polymer mixture. This slow growth arises due to the suppression…
We investigated the interfacial interaction of simple functional groups ($\ensuremath{-}{\mathrm{NH}}_{2}$, $\ensuremath{-}\mathrm{CN}$, $\ensuremath{-}{\mathrm{CH}}_{3}$, $\ensuremath{-}{\mathrm{CHOCH}}_{2}$) with single wall carbon nanotubes, using ab initio calculations. We computed binding energies and attachment…
So leicht wie das AB2C: Bei der Bestrahlung in Lösung mit einer 400-W-Lampe wandelt sich die freie Corrolbase 1 in das entsprechende trans-AB2C-Porphyrin 2 um. Als Beiprodukt entsteht ein offenkettiges Biliverdin.
Bicrystalline ZnO nanocombs have been prepared by zinc powder evaporation at 650 degrees C. Structural analysis showed that as-synthesized samples are composed of two crystals that form a twin structure parallel to the (113) plane with the growth direction of the branching nanowires and the main stem closely parallel…
Poly(4-methyl-1-pentene), PMP, a high melting polymer composed of hydrogen and carbon, has the potential to become an alternative to polyethylene (PE) as shielding material against Galactic Cosmic Radiation (GCR). PMP exhibits higher thermal stability than PE and is transparent in the UV/visible region of the electrom…
Atomic force microscopy (AFM) was used to study the nanoscale surface chemistry and morphological changes caused by chemical treatment of sisal fibers. Scanning Electron Microscopy (SEM) micrographs indicated that sisal in natura (bundle of fibers) is formed by fibers with diameters of approximately 10 microm. AFM ima…
Abstract Summary: A chiral, regioregular poly[3‐(4‐alkoxyphenyl)thiophene] has been prepared and studied. Films prepared by fast evaporation of the solvent, consist of random‐coils, while films prepared by slow evaporation are composed of chirally aggregated, coplanar strands. Heat treatment transforms the random‐coil…
The dynamics of heterogeneities in a shear thickening, concentrated colloidal suspension is investigated through speckle visibility spectroscopy, a dynamic light scattering technique recently introduced [P. K. Dixon and D. J. Durian, Phys. Rev. Lett. 90, 184302 (2003)]. Formation of shear-induced heterogeneities is ob…
The design, the physical properties and the implementation of nanostructured protein biofilms and nanostructured biocrystals are here summarized from ab initio considerations. Particular emphasis is placed on those being developed in our Institute having unique properties useful in a wide range of applications.
A novel fibre optic sensor system has been developed for linear location of acoustic emission (AE). The demonstration of linear location of acoustic emission was conducted using a pair of serial multiplexed fibre coupler-based acoustic emission sensors in conjunction with a single light source. The simulated AE source…
Recent researches have largely been focused on chitosan, which is deacetylated chitin, the most abundant natural polysaccharide after cellulose. In this paper, we report the fabrication of gold nanoparticles (GNPs) by UV photoactivation in the presence of biopolymeric chitosan and the tracing of the gold salt solution…
The gene expression for phasins (PhaP), which are predominantly polyhydroxyalkanoates (PHAs) granule-associated proteins, is regulated by a repressor protein of PhaR through the dual binding abilities of PhaR to the target DNAs and the granules. In this study, the binding functions of PhaR to poly[(R)-3-hydroxybutyrat…
Polymer degradation mechanisms are exceedingly complex, but their understanding is fundamental to improving material durability. We have initiated selective isotopic labeling as a means of tracking oxidation chemistry, and chose polypropylene (PP) to test this approach, since it has a simple structure (three unique ca…
We demonstrate that the adsorption of cationic spherical polyelectrolyte brushes (SPB) on negatively charged mica substrates can be controlled in situ by the ionic strength of the suspension. The SPB used in our experiments consist of colloidal core particles made of polystyrene. Long cationic polyelectrolyte chains a…
A very high tunable inter-digital capacitor (IDC) using the bismuth zinc niobate (BZN) pyrochlore thin-film dielectrics is presented for microwave applications. To increase the tunability of the IDC and reduce DC bias voltage, its electrodes are fully embedded into the tunable BZN dielectrics. At 20 V DC applied, the…
A fundamental question in condensed matter science is to understand what governs the increase of relaxation time, and ultimately the glass formation, in liquids upon cooling. This phenomenon, which can be observed in chemically very different systems ranging from metals to polymers, has had practical importance for th…
In this paper, we demonstrate the synthesis of sulfide and selenide nanocrystals in a water-ethanol mixed solution system. This synthetic way was based on the direct reactions between metal ions and S(2-)/Se. Linoleic acid was adopted to protect the nanocrystals from agglomeration. Without involving extreme experiment…