Materials Literature
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The adsorption of a cationic luminescence probe, tris(2,2‘-bipyridine)ruthenium(II) ([Ru(bpy) 3 ] 2+ ), into a mesoporous silica was investigated in order to understand the nature of mesoporous silicas as immobilizing media for organic guest species. The adsorption of the probe into the mesoporous silica was conducted…
The adsorption of propene on Au(111) and Au(100) was investigated using temperature-programmed desorption (TPD) and high-resolution energy loss spectroscopy (HREELS). A desorption activation energy of 9.4 kcal/mol and very small shifts of the vibrational frequencies from their gas-phase values indicate that the intera…
The rupture of a medium under stress typifies breakdown phenomena. More generally, the latter encompass the dynamics of systems of many interacting elements governed by the interplay of a driving force with a pinning disorder, resulting in a macroscopic transition. A simple mean-field formalism incorporating these fea…
The transient network literature up to now has considered that the connection probability of a free strand does not depend on the strand extension, in contrast with the disconnection probability. We argue that, on thermodynamic grounds, both probabilities must have the same dependence on the strand extension. We propo…
Self-assembly of gold nanorods (NRs) with aspect ratio of ∼4.6 (12 nm in diameter and 50−60 nm in length) has been studied using transmission electron microscopy (TEM). Under appropriate conditions such as nanoparticle concentration, solvent evaporation, narrow size distribution, ionic strength, and surfactant concent…
Fluorescence microscopy, in combination with atomic force microscopy (AFM), reveals that rhodamine-labeled lysozyme adsorbs strongly from aqueous solution to polishing marks of nanometer depths on fused silica surfaces. The fluorescence and topographical images correspond closely. Fluorescence intensity varies by as m…
The synthesis, characterization, and physical properties of a novel, fully reversible, light-driven molecular switch, (R,R)-1/(R,R)-2, based on a tetraethynylethene-1,1′-binaphthalene hybrid system are presented. trans-Configured (R,R)-1 was synthesized in 57% yield by Stille cross-coupling between stannylated tetraet…
The intramolecular and long-range ferromagnetic coupling between p-phenylenediamine radical cations in head-to-tail coupled oligo(1, 4-phenyleneethynylene)s and oligo(1,4-phenylenvinylene)s between neighbors and next-nearest neighbors is described. UV/vis/near-IR experiments show that the radical cations are localized…
In this paper we describe two experiments, in the near- and mid-infrared, designed to investigate the evolution under pressure of the GaTe refractive index for polarization parallel and perpendicular to the crystallographic c -axis (in the layer plane). The refractive index dispersion for both light polarizations has…
The interaction of acetic acid vapors with iron-exchanged montmorillonites leads to iron acetate intercalates which upon pyrolysis transform to magnetic γ-iron oxide nanoparticles dispersed onto the external surface of the clay mineral. As these novel clay composites retain the original swelling and cation-exchange pr…
Vanadium oxide nanotubes (Cn-VOx-NTs) contain α-monoamines (CnH2n+1NH2 with 4≤n≤22) as templates intercalated between crystalline VOx layers comprising multilayer tube walls. The present study reveals that a large proportion of the amines can easily be exchanged by metal cations. The tubular morphology is not affected…
Platinum nanoparticles were synthesized by reduction of a K 2 PtCl 4 solution using a thermosensitive polymer, poly( N -isopropylacrylamide, NIPA), as a capping polymer. The Pt nanoparticles obtained at temperatures above and below the lower critical solution temperature (LCST) of NIPA showed clear differences. When t…
The X-ray structures of the ligand free (apo) and the Mg(2+)*o-succinylbenzoate (OSB) product complex of o-succinylbenzoate synthase (OSBS) from Escherichia coli have been solved to 1.65 and 1.77 A resolution, respectively. The structure of apo OSBS was solved by multiple isomorphous replacement in space group P2(1)2(…
The adsorption of HIV-1 capsid p24 protein bearing six histidine residues (named RH24) onto well-characterized thermosensitive and cationic poly(styrene)−poly(N-isopropylacrylamide) core−shell particles was investigated as a function of temperature, pH, incubation time, and salinity. The maximum amount of adsorbed RH2…
The aerial parts of Caralluma russeliana yielded four new pregnane glycosides, russeliosides A-D (1-4), in addition to a known flavone glycoside, luteolin 4'-O-beta-D-neohesperidoside. The structures of compounds 1-4 were elucidated using a combination of spectroscopic methods.
Diamond's many extreme properties, such as its radiation and corrosion resistance, large bandgap, high electron and hole mobility, make it an attractive semiconductor for UV and particle detectors. This paper reviews the properties that are exploited by the latest generation of detectors, such as the radiation hardnes…
Assembly of organized molecular structures in ordered mesoporosity has shown to be a very powerful approach to synthesize novel functional nanoscale materials. This approach allows rational design of a wide range of material properties, such as pore dimension, surface chemistry, stereochemistry, spatial distribution o…
The switching of magnetic layers is studied under the action of a spin current in a ferromagnetic metal/non-magnetic metal/ferromagnetic metal spin valve. We find that the main contribution to the switching comes from the non-equilibrium exchange interaction between the ferromagnetic layers. This interaction defines t…
Nanostructured semiconductor particles are currently under intense investigation because of their interesting photophysical and photochemical properties. Several preparation methods have been exploited for this class of materials; among them, the use of reverse micelles or “water-in-oil” microemulsions is a simple and…
We present a comprehensive investigation of the spatial dimensions of colloidal spherical polyelectrolyte brushes in solutions. The particles studied here consist of a solid polystyrene core of 50−100 nm radius onto which linear poly(acrylic acid) (PAA) chains are chemically grafted. The grafting is achieved through p…