Materials Literature
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Efficient multiple-exciton generation (MEG) in semiconductor quantum dots has been recently reported. The MEG efficiency has so far been evaluated assuming that the change (bleaching) of the absorption spectrum due to MEG is linearly proportional to the number of excitons N(X). Here, we critically examine this assumpt…
Nach dem Vorbild von Eierschalen in der Natur wurden lebende Hefezellen mit einem künstlichen Mineralüberzug versehen. Dazu wurde die schichtweise (LBL) Behandlung mit funktionellen Polymeren mit einer biomimetischen In-situ-Mineralisierung kombiniert. Die gebildeten harten anorganischen Schalen haben enorme Auswirkun…
In this paper we present the formulation, preparation and characterization of new polymeric composite materials containing a nano-hybrid to be used for the controlled molecular delivery of an anti-inflammatory molecule, Diclofenac. The nano-hybrid consists of a layer of double hydroxide of an Mg-Al hydrotalcite type,…
Reaching 100% selectivity is the theme of the twentyfirst century in heterogeneous and heterogenized homogeneous catalysis. To study chemical reactivity at the atomic scale, model systems have been prepared and characterized. We discuss selectivity of hydrogenation and dehydrogenation reactions on supported Pd particl…
The synthesis of two new series of phosphorus-containing dendrimers capped by bis(diphenylphosphinomethyl)amino groups linked to either tyramine or l -tyrosine methyl ester is reported up to the third generation (48 end groups). The corresponding complexes obtained in situ by reaction with Pd(OAc) 2 are used as cataly…
The polycaprolactone (PCL) membranes were successfully modified by deposition of chitosan/heparin multilayer via a simple electrostatic self-assembly method. To immobilize chitosan, a novel ternary polysaccharide derivate, chitosan-g-PCL-b-poly-(ethylene glycol) (PEG) was used coating on PCL film first, which resulted…
We report the cushioning behavior of highly agglomerated carbon nanotubes. The nanotube agglomerates can be repeatedly compacted to achieve large volume reduction (>50%) and expanded to nearly original volume without structural failure, like a robust porous cushion. At a higher pressure range (10-125 MPa), the energy…
Sr 1− x RE x Fe 12 O 19 and Sr 1− x RE x Fe 12− x Co x O 19 ( x = 0–0.4 and RE = Pr, Nd) M-type hexaferrite powders were produced by a conventional ceramic process. Structural investigations made by x-ray diffraction and Mössbauer spectrometry reveal that the solubility of the rare earth ion in the M-type phase depend…
Spectroscopic properties of Yb3+/Er3+ codoped tellurite glasses as a function of Er3+ and Yb3+ concentration have been investigated. Under 970 nm excitation three strong up-conversion emission bands centred at 525, 546 and 656 nm were observed, and the characteristic near infrared emission band was centred at 1.53 µm.…
The effect of uniaxial strain on the optical transition energies of single-walled carbon nanotubes with known chiral indices was measured by Rayleigh scattering spectroscopy. Existing theory accurately predicts the trends in the measured strain-induced shifts, but overestimates their magnitude. Modification of the ana…
The reorientation of dye molecules can be used to monitor the segmental dynamics of a polymer melt. We utilize this technique to measure stress-induced mobility in a lightly cross-linked poly(methyl methacrylate) (PMMA) glass during tensile creep deformation. At 377 K (18 K below the glass transition temperature Tg),…
We study the heat current J in a classical one-dimensional disordered chain with on-site pinning and with ends connected to stochastic thermal reservoirs at different temperatures. In the absence of anharmonicity all modes are localized and there is a gap in the spectrum. Consequently J decays exponentially with syste…
We present a model for the viscous friction in foams and concentrated emulsions, subject to steady shear flow. First, we calculate the energy dissipated due to viscous friction inside the films between two neighboring bubbles or drops, which slide along each other in the flow. Next, from this energy we calculate the m…
TarO (http://www.compbio.dundee.ac.uk/taro) offers a single point of reference for key bioinformatics analyses relevant to selecting proteins or domains for study by structural biology techniques. The protein sequence is analysed by 17 algorithms and compared to 8 databases. TarO gathers putative homologues, including…
ROP artists: The ROP of racemic β-butyrolactone (BL) catalyzed by highly active chromium(III) salophen complexes 1 gives poly(hydroxybutyrate) (PHB) with high molecular weight and with isotacticities of 60–70 %. The product is a biodegradable polymer material with mechanical properties that can be varied from crystall…
The structure and remodeling of collagen in vivo is critical to the pathology and healing of many human diseases, as well as to normal tissue development and regeneration. In addition, collagen matrices in the form of fibers, coatings, and films are used extensively in biomaterial and biomedical applications. The spec…
ZnO films co-doped with H and Al (HAZO) were prepared by sputtering ZnO targets containing 1 wt% Al 2 O 3 on Corning glass at a substrate temperature of 150 °C with Ar and H 2 /Ar gas mixtures. The effects of hydrogen addition to Al-doped ZnO (AZO) films with low Al content on the electrical, the optical and the struc…
Recent advances in metamaterial research have provided us a blueprint for realistic cloaking capabilities, and it is crucial to develop practical designs to convert concepts into real-life devices. We present two structures for optical cloaking based on high-order transformations for TM and TE polarizations respective…
We demonstrate noncontact, high quality surface modification with spatial resolution of ~20 nm. The nanowriting is based on the interaction between the surface and the tip of an Atomic force microscope illuminated by a focused laser beam and hovering 1-4 nanometers above the surface without touching it. The floating t…
The paper has been withdrawn for some reasons