Materials Literature
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A novel series of naphthalimide dendrimers has been synthesized based on a convergent and divergent combined approach. The dendrimers consist of naphthalimide-based cores, Fréchet-type poly(aryl ether) dendrons, and carbazole (CZ) or oxadiazole (OXZ) peripheral groups. The higher generation dendrimer has site-isolatio…
The reaction of dipyrromethanedicarbinols with pyrrole leading to meso-substituted corroles was investigated to determine whether mild acid catalysts [Dy(OTf)(3), Yb(OTf)(3), Sc(OTf)(3), and InCl(3)] known to provide porphyrins from dipyrromethanecarbinol species while suppressing undesired reversibility (resulting in…
The increasing effort on development of bio-based polymeric materials in recent years is motivated by the basic concept of meeting the sustainability criteria for industrial development in the third millennium. Within this framework, our research group is currently involved in assessing the potentiality of some agro-i…
Novel silica-coated luminescent europium (SCLE) nanoparticles have been prepared by copolymerization of tetraethyl orthosilicate and 3-aminopropyl(triethoxy)silane with ammonium hydroxide in a water-in-oil microemulsion containing a luminescent Eu 3+ chelate, Triton X-100, n -octanol, and cyclohexane. The nanoparticle…
Abstract We have fabricated Mn‐doped Bi 2 Te 3 and Sb 2 Te 3 single crystals by the vertical gradient solidification method. The compositions and crystal structures of Bi 2− x Mn x Te 3 and Sb 2− x Mn x Te 3 were determined using Electron Probe Micro‐Analyzer (EPMA) and powder X‐ray diffraction (XRD) patterns, respect…
Abstract The development of DSM's Hybrane® hyperbranched poly(ester amides) is described. The monomer (1) for the hyperbranched polyester is obtained from the reaction of a cyclic anhydride with diisopropanol amine, yielding a tertiairy amide with one COOH and two OH groups. Polycondensation takes place via an oxazoli…
The synthesis of calcite fibers has been confined to nature and is observed most prominently in sea urchin teeth and bacterial deposits. By generating a liquid-phase mineral precursor, induced by the addition of acidic macromolecules to a crystallizing solution, calcite fibers with diameters ranging from 100 to 800 nm…
We present local conductance measurements of carbon nanotube networks with nanometer scale resolution and show that there are discrete drops in conductance that correspond to junctions of metallic nanotubes and semiconducting nanotubes. The anomalies of these networks compared to thin films are shown, and a new method…
In the last few years, polymers with highly conjugated chains have attracted much attention because of their wide variety of applications in the field of electronics, opto‐electronics, and photonics. Polyimines (PIs) (polymeric Schiff bases) is a class of polymer family, which has been less reviewed. In this paper, we…
Rotational Brownian motion of colloidal magnetic particles in ferrofluids under the influence of an oscillating external magnetic field is investigated. It is shown that for a suitable time dependence of the magnetic field, a noise induced rotation of the ferromagnetic particles due to rectification of thermal fluctua…
A bottleneck for multi-timescale dynamics is the computation of the potential energy surface (PES). We explore the use of genetic programming (GP) to symbolically regress a mapping of the saddle-point barriers from only a few calculated points via molecular dynamics, thereby avoiding explicit calculation of all the ba…
A Langevin approach to understand the noise of microwave devices is presented. The device is represented by its equivalent circuit with the internal noise sources included as stochastic processes. From the circuit network analysis, a stochastic integral equation for the output voltage is derived and from its power spe…
I report for the first time surface-enhanced Raman scattering (SERS) from molecules adsorbed on InAs/GaAs quantum dots. This result is very interesting because previous SERS experiments have been essentially restricted to molecules adsorbed on metallic surfaces. Raman scattering from pyridine molecules adsorbed on the…
We have studied spin carrier dynamics under full spin-orbit coupling. The anisotropy of dispersions for independent circular spinor polarizations is explored as a possible vertical multichannel voltage controlled spin-filter. Small voltage variations are found to select the current polarizations in a resonant tunnelin…
Abstract Studies on the glass transition temperature (T g ) of chitosan are difficult to pursue because of the difficulty in sample preparation and the hydroscopicity of samples. There are a few works concerning this principal relaxation of chitosan. Among them, several quite different values (150°C, 161°C, and 203°C)…
The present study demonstrates that the superhydrophobic behavior of the lotus leaf structure can be mimicked by creating a honeycomb-like polyelectrolyte multilayer surface overcoated with silica nanoparticles. Superhydrophobicity was achieved by coating this highly textured multilayer surface with a semifluorinated…
The thermal diffusivity in the vicinity of the magnetic transition of a set of La1−xSrxMnO3 (0⩽x⩽0.3) single crystals has been measured using the photopyroelectric technique. Taking into account that the inverse of the thermal diffusivity behaves as the specific heat, the critical exponent α has been obtained. In the…
We report difference of growth mechanism of half-metallic CrO2 thin films deposited by chemical vapor deposition method on preferentially oriented (111) and (200) Pt/TiO2/SiO2/Si substrates. The CrO2 thin films grown on (111) Pt/TiO2/SiO2/Si substrate were (200) oriented, and highly crystalline rectangular grains were…
Despite being size-extensive, the "second-generation" 1-matrix functionals for the electron-electron repulsion energy V(ee) yield vanishing correlation energy for the homogeneous electron gas. This failure is directly related to the idempotency condition imposed upon an auxiliary matrix that enters the expression for…
The structural, electrical, and magnetic properties of the YMn2−x(Fe,Co)xO5−δ (0.0⩽x⩽1.0) pseudobinary oxides have been studied utilizing x-ray diffraction, atomic force microscopy, and magnetic measurements. Our interest in these oxides begins with the hypothesis that both ferroelectric and ferromagnetic properties c…