Materials Literature
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Hybrid layered aluminosilicate nanoparticles (HLNP) containing octadecylamine (ODA) as the organic part, and silica nanoparticles with spherical morphology containing ODA (HSNP) or without ODA (SNP) were prepared by the sol–gel method and used for the formation of nanocomposites with polypropylene. The polypropylene m…
We find that the high thermal conductivity of carbon nanotubes remains intact under severe structural deformations while the corresponding electrical resistance and thermoelectric power show compromised responses. Similar robust thermal transport against bending is found for boron nitride nanotubes. Surprisingly, for…
LaCoO3 exhibits an anomaly in its magnetic susceptibility around 80 K associated with a thermally excited transition of the Co3+-ion spin. We show that electron energy-loss spectroscopy is sensitive to this Co3+-ion spin-state transition, and that the O K edge prepeak provides a direct measure of the Co3+ spin state i…
In this letter we describe a novel but effective wet-chemical route for the simple preparation of snowflake-like dendritic nanostructures of Ag, which are homogeneous in size, carried out by directly mixing AgNO3 and p-phenylenediamine (PPD) aqueous solutions at room temperature. It reveals that such dendrites are agg…
Preface. Nanotoxicology:Laying a firm Foundation for Sustainable Nanotechnologies. Carbon Nanotube Structures and Compositions: Implications for Toxicological Studies. Effect-Oriented Physico-chemical Characterization Methods of Nanomaterials. Physico-chemical Characteristics of Nanoparticles which Determine their Pot…
We have previously shown that convection-enhanced delivery (CED) of highly stable nanoparticle/liposome agents encapsulating chemotherapeutic drugs is effective against intracranial rodent brain tumor xenografts. In this study, we have evaluated the combination of a newly developed nanoparticle/liposome containing the…
Genau hingeschaut! Bipyridiniumsalze mit Boronsäure-Substituenten (BBVs) als Rezeptoreinheiten können zwölf Saccharide in wässriger Lösung bei neutralem pH-Wert mithilfe eines Fluoreszenzindikator-Verdrängungsassays unterscheiden. Im Bild ist der Fluoreszenzanstieg eines Fluoreszenzfarbstoffs mit BBV-Rezeptoren nach d…
Abstract Low density polyethylene (LDPE)/clay nanocomposites, which can be used in packaging industries, were prepared by melt‐mix organoclay with polymer matrix (LDPE) and compatibilizer, polyethylene grafted maleic anhydride (PEMA). The pristine clay was first modified with alkylammonium salt surfactant, before melt…
We report an angular resolved photoemission study of ${\mathrm{Na}}_{x}{\mathrm{CoO}}_{2}$ with $x\ensuremath{\simeq}0.73$ where it is found that the renormalization of the quasiparticle (QP) dispersion changes dramatically upon a rotation from $\ensuremath{\Gamma}\mathrm{M}$ to $\ensuremath{\Gamma}\mathrm{K}$. The co…
The field dependence of the magnetic entropy change of ferromagnetic lanthanide-based materials has been studied. The recently proposed master curve for the field dependence of the magnetocaloric effect of Fe-based amorphous alloys can also be constructed for these lanthanide-based crystalline materials, suggesting a…
That's discrimination! An array of boronic acid appended bipyridinium salts (BBVs) as receptor units is able to distinguish twelve saccharides in aqueous solution and at neutral pH values by a fluorescent-indicator displacement assay. The picture shows the fluorescence increase of a fluorescent dye with BBV receptors…
We have studied Bloch electrons in a perfect unidirectional superlattice subject to crossed electric and magnetic fields, where the magnetic field is oriented ``in-plane'', i.e. in parallel to the sample plane. Two orientation of the electric field are considered. It is shown that the magnetic field suppresses the int…
Agradecimentos: We acknowledge the financial support from THEO-NANO, the Instituto de Nanociências and IMMP/CNPq, the Brazilian agencies FAPESP, CAPES, and CNPq
The optical properties of pentacene (PEN) and perfluoropentacene(PFP) thin films on various SiO2 substrates were studied using variable angle spectroscopic ellipsometry. Structural characterization was performed using X-ray reflectivity and atomic force microscopy. A uniaxial model with the optic axis normal to the sa…
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This paper reports the kinetics of hydrogen generation from the reaction between sodium borohydride and methanol, water, and their mixtures over a temperature range between −20 and +50 °C. Hydrogen generation was found to obey a first-order rate law with respect to sodium borohydride concentration for each of the four…
We conjecture that certain patterns (scars), theoretically and numerically predicted to be formed by electrons arranged on a sphere to minimize the repulsive Coulomb potential (the Thomson problem) and experimentally found in spherical crystals formed by self-assembled polystyrene beads (an instance of the generalized…
Recently (PRL 96, 106804 (2006)) it was suggested that cobaltocene(CC) molecules encapsulated into (7,7) carbon nanotubes (CNT@(7,7)) could be the basis for new spintronic devices. We show here based on impact molecular dynamics and DFT calculations that when dynamical aspects are explicitly considered the CC encapsul…
A new method based on the Kirkendall effect is developed to fabricate Ti–Al porous alloys with open pores and adjustable pore size. This novel porous material (microstructures shown in the figure) has excellent pore size stability and outstanding corrosion and oxidation resistance. These exceptional advantages of fabr…
The ability to create thick tissues is a major tissue engineering challenge, requiring the development of a suitable vascular supply. Current trends are seeing the utilization of cells seeded into hybrid matrix/scaffold systems to create in vitro vascular analogues. Approaches that aim to create vasculature in vitro i…