Materials Literature
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Chitosan (Ch) and some of its derivatives have been proposed as good biomaterials for tissue engineering, to construct scaffolds promoting tissue regeneration. In this work we made composite films from Ch and mixtures of Ch with gelatin (G) and poly-l-lysine (PLL), and evaluated the growth on these films of PC12 and C…
Aligned and randomly oriented chitosan nanofibers were prepared by electrospinning. The fibers were modified with the RGD cell-adhesive peptide through a heterobifunctional crosslinker containing a segment of poly(ethylene glycol) (PEG). PEG rendered the surface hydrophilic and provided flexible spacers, allowing the…
We report on the extensive characterization of single-walled carbon nanotubes (SWCNTs) dispersed in a variety of surfactants, such as sodium dodecyl benzene sulfonate (SDBS), sodium cholate (SC), and three synthesized perylene-based surfactants, by using differential sedimentation in H(2)O and D(2)O. Multidimensional…
Chemist's caviar: Stimuli-responsive fusogenic vesicles from a cardanol-taurine surfactant are reported. The thermo-responsive behavior of the unsaturations in the alkyl chains, reminiscent of homeoviscous alterations, lead to a micelle-to-vesicle transformation and to the formation of caviar-like adhesive vesicles (s…
We demonstrate, for the first time, in the Baeyer-Villiger oxidation of cyclohexanone with aqueous hydrogen peroxide under conditions aimed at obtaining ε-caprolactone, that a thermally activated radical reaction leads to the concurrent formation of adipic acid, even when a stoichiometric amount of the oxidant is used…
Surface modifications of glass slides employing the sterically hindered tert-butyl substituted silanetriol are described. To the best of our knowledge, this is the first time that a stable silanetriol has been directly used for this purpose. So far unprecedented, this process runs under neutral aqueous conditions and…
We present a generalized nonlinear susceptibility retrieval method for metamaterials based on transfer matrices and valid in the nondepleted pump approximation. We construct a general formalism to describe the transfer matrix method for nonlinear media and apply it to the processes of three- and four-wave mixing. The…
Crystallization in a constrained environment was used to prepare organic molecular nanocrystals of glycine. Bifunctional patterned surfaces, with hydrophilic islands as small as 1 µm surrounded by hydrophobic regions, were prepared by photolithography. Individual nanosized glycine crystals were formed from the confine…
Nanojuwelen als Katalysatoren: Die Zersetzung von Phenol mit H2O2 gelingt durch Verwendung von Goldnanopartikeln, die auf Fenton-vorbehandelten Diamantnanopartikeln aufgebracht sind, als hochselektiven (>79 %) und effizienten (Wechselzahl: 321 000) Katalysatoren für die Fenton-Reaktion bei Raumtemperatur. Das Schema z…
We report the effect of electrochemical oxidation in nitric acid on the electronic properties of epitaxial graphene (EG) grown on silicon carbide substrates; we demonstrate the availability of an additional reaction channel in EG, which is not present in graphite but which facilitates the introduction of the reaction…
Abstract Silane coatings with different thicknesses were synthesized on CNFs for reinforcement of polyethylene composites. The thickness of the silane coating was adjusted by using a basic catalyst to increase the overall reactivity of the silane groups, resulting in a thick coating of ≈46 nm (ca. 90% increase in fibe…
This Letter describes the shock-induced amorphization of single-crystal Si bombarded by nanodroplets. At impact velocities of several kilometers per second, the projectiles trigger strong compression pulses lasting tens of picoseconds. The phase transition, confirmed via transmission electron microscopy and electron b…
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Granulation is an essential step to improve the flowability of submicrometer and nanometric ceramic powders to make them suitable for industrial die pressing. Controlled agglomeration of yttria‐stabilized zirconia nanopowders with a primary particle size of ∼16 nm was carried out using two different routes, viz. spray…
Oil-in-water (o/w) Pickering emulsions stabilized with silica nanoparticles were prepared. Droplets of diethyl phthalate (oil phase) act as reservoirs for 8-hydroxyquinoline (8-HQ), which is used as (a) the hydrophobizing agent for the silica particles and (b) an encapsulated corrosion inhibitor for application in act…
We studied the self-diffusion of colloidal ellipsoids in a monolayer near a flat wall by video microscopy. The image processing algorithm can track the positions and orientations of ellipsoids with subpixel resolution. The translational and rotational diffusions were measured in both the laboratory frame and the body…
We take the resistivity $(\ensuremath{\rho})$ and the current-voltage $(I\text{\ensuremath{-}}V)$ characteristics of a ${\text{SmFeAsO}}_{0.85}$ single crystal as a function of temperature $(T)$ for various magnetic fields up to 18 T along the $c$ axis. The tail region of $\ensuremath{\rho}(T)$ well fits the three-dim…
Uniform ZnO/ZnFe 2 O 4 fluorescent magnetic composite hollow nanopsheres can be successfully fabricated using carbonaceous nanospheres as templates, which are synthesized via a hydrothermal approach. The ZnO/ZnFe 2 O 4 composited nanoarchitectures show fluorescent and magnetic properties for improved physical and chem…
Using surface enhanced Raman spectroscopy (SERS), we observed Raman enhancements (10 4 −10 5 ) for pyridine molecules adsorbed on II−VI semiconductor quantum dots on (uncapped CdSe/ZnBeSe) produced by molecular beam epitaxy. When a monolayer of pyridine is adsorbed on these structures, excitation at 488 nm produces in…
Poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) fibers containing carbonated hydroxyapatite (CHA) nanoparticles with different CHA amounts (5, 10 and 15 wt%) were electrospun with the aid of ultrasonic power for dispersing the nanoparticles. Scanning electron microscopy and energy-dispersive x-ray spectroscopy results…