Materials Literature
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Two-dimensional asymmetrical Ising models consisting of two weakly coupled dissimilar segments, coupled to heat baths with different temperatures at the two ends, are studied by Monte Carlo simulations. The heat rectifying effect, namely asymmetric heat conduction, is clearly observed. The underlying mechanisms are th…
Abstract In this article, we present quantum chemical calculations, based on density functional theory (DFT), performed to investigate the geometries and the opto‐electronic properties of a new synthesized graft copolymer based on poly( N ‐vinylcarbazole) (PVK) and poly(3‐methylthiophene) (PMeT) named PVK‐3MeT. First,…
We investigate the relationship between photoluminescence (PL) intensity and environmental sensitivity of surfactant-wrapped single-walled carbon nanotubes (SWNTs). SWNTs were studied under a variety of conditions in suspension as well as encapsulated in silica nanocomposites, which were prepared by an efficient chemi…
É crescente o interesse nos compósitos poliméricos reforçados com fibras vegetais curtas em substituição às fibras de vidro, pois as fibras naturais provêm de fontes renováveis, não são abrasivas aos equipamentos de processamento, são biodegradáveis, e possuem baixa densidade comparada às fibras de vidro. Elas apresen…
Abstract The members of the family of oxygen‐defective fluorites R 2 MoO 6– δ (R = Tb, Dy, Y, Ho, Er, Tm, Yb) have been synthesized under reducing conditions and characterized in order to evaluate their potential use as anodes in intermediate‐temperature solid oxide fuel cells (IT‐SOFCs). A neutron powder diffraction…
Abstract Blends films based on different ratios of concentrated aqueous solutions of chitosan (CS) and sodium alginate (AG) in the presence of 1% of glutaraldehyde, as a cross‐linking agent for chitosan, were prepared by solution casting and then exposed to gamma irradiation. The formed blends were characterized by IR…
We report a facile chemical route for stabilizing a dispersion of carboxylated single-walled carbon nanotubes (SWCNTs) in a ZnO sol. The dispersion is stabilized via capping of the carboxyl groups on the SWCNT surface by a titania layer, which was confirmed by Fourier transform infrared spectroscopy and transmission e…
Polyaniline nanoparticles were synthesized by simple electrochemical polymerization of aniline in systems (a) aniline-sodium dodecyl sulfate (NaDS)-dodecylbenzene sulfonic acid (DBSA)-H(2)O and (b) aniline-NaDS-DBSA-cetyltrimethyl ammonium bromide (CTAB)-H(2)O. Different morphologies including compact and fractal/dend…
An investigation of the segmental dynamics and glass transition behavior of a miscible polymer blend composed of poly(methyl methacrylate) (PMMA) and poly(styrene-ran-acrylonitrile) (SAN) and its melt intercalated nanocomposite by dynamic mechanical analysis is presented. The principle goal was to address the effect o…
Nanotubes released: π–π stacking interactions between single-walled carbon nanotubes (SWCNTs) and a monolayer of aromatic rings anchored on a gold surface result in reversible surface assembly of the SWCNTs. Protonation of a pyridine-based self-assembled monolayer reduces the pyridine–SWCNT interaction and thus releas…
This study aimed to synthesize and characterize biodegradable microcapsules based on poly(lactic acid) (PLA) and ethylcellulose (EC) for a controlled delivery of calcium hydroxide. Phase separation technique was adopted to synthesize calcium hydroxide-loaded PLA/EC microcapsules. Four PLA/EC blends (4/1, 1/1, 1/4, pur…
We report on vibrating reed measurements combined with density functional theory-based calculations to assess the elastic and damping properties of Fe–Pd ferromagnetic shape memory alloy splats. While the austenite–martensite phase transformation is generally accompanied by lattice softening, a severe modulus defect a…
Cisplatin (CDDP) is one of the most active cytotoxic agents and has been widely used in the treatment of peritoneal carcinomatosis by the intraperitoneal (i.p.) route. However, CDDP, a low-molecular-weight compound, is rapidly absorbed by the capillaries in the i.p. serosa and transferred to the bloodstream, inducing…
Abstract The crystallization behaviors of ultra high‐molecular weight polyethylene (UHMWPE) in liquid paraffin under isothermal and nonisothermal conditions were studied by differential scanning calorimetry during the solid–liquid thermally induced phase separation (TIPS) process. For isothermal crystallization, the d…
The refractive index sensitivity of localized surface plasmon resonance sensors can be improved by placing the plasmonic metal particles on pillars instead of on a planar substrate. In this paper, a simple and versatile colloidal lithography method for the fabrication of plasmonic Au islands on top of polymer nanopill…
A comprehensive study, which is presented in two parts, is performed to assess the radio-frequency (RF) performance potential of array-based carbon-nanotube field-effect transistors (CNFETs). In Part I, which is presented in this paper, the time-dependent Boltzmann transport equation is solved self-consistently with t…
Five novel sesquiterpene glycosides, namely, cosmosporasides A-E (1-5), were isolated from the ethyl acetate extract of the fermented broth of Cosmospora joca. The structures of 1-5 were elucidated on the basis of spectroscopic data analyses, monosaccharide composition analyses, and monosaccharide chirality analyses.…
Dissipative particle dynamics (DPD), a mesoscopic simulation approach, is used to investigate the effect of volume fraction of polyethylene (PE) and poly(l-lactide) (PLLA) on the structural property of the immiscible PE/PLLA/carbon nanotube in a system. In this work, the interaction parameter in DPD simulation, relate…
Silica is a well-known impurity in solid oxide fuel cell raw materials, namely NiO and yttria-stabilized zirconia (YSZ). At elevated temperatures silica will migrate to the grain boundaries, form insulating siliceous phases, and lead to a decrease in the ionic conductivity of the electrolyte. Furthermore, silica impur…
Laser irradiation of Ge quantum dots (QDs) grown on Si(100) substrates by solid-source molecular beam epitaxy has been performed using a Nd:YAG laser (532 nm wavelength, 5 ns pulse duration) in a vacuum. The evolution of the Ge QD morphology, strain and composition with the number of laser pulses incident on the same…