Materials Literature
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The experimental valence band photoemission spectrum of semiconductors exhibits multiple satellites that cannot be described by the GW approximation for the self-energy in the framework of many-body perturbation theory. Taking silicon as a prototypical example, we compare experimental high energy photoemission spectra…
Linear π-conjugated oligomers have been widely investigated, but the behavior of the corresponding cyclic oligomers is poorly understood, despite the recent synthesis of π-conjugated macrocycles such as [n]cycloparaphenylenes and cyclo[n]thiophenes. Here we present an efficient template-directed synthesis of a π-conju…
The availability of high-quality colloidal nanosheets underpins a diverse range of applications and investigations into dimension-dependent physical properties. To facilitate this, synthetic methods that yield single-crystal colloidal nanosheets with regular shapes, uniform lateral dimensions, and tunable thicknesses…
Polyaniline nanofibers were prepared by in situ polymerization of aniline in the presence of surfactants such as tetrabutylammonium hydroxide and sodium dodecyl benzenesulfonate stabilized graphene under acidic condition. A homogeneous dispersion of individual graphene sheets within the polymer matrix was achieved due…
Increasing manufacture and use of engineered nanoparticles is leading to a greater probability for release of engineered nanoparticles into the environment and exposure to organisms. In particular, zinc oxide (ZnO) is toxic, although it is unclear whether this toxicity is due to the zinc oxide nanoparticles, dissoluti…
We present a calculation of the thermal conductivity of graphene nanoribbons, based on solving the Boltzmann transport equation with the full phonon dispersions, a momentum-dependent model for boundary scattering, as well as three-phonon and isotope scattering. The interplay between strong edge roughness scattering an…
Abstract Polymer nanocomposites (PNs) based on an amorphous polyamide (aPA) modified with both a maleated rubber (mSEBS) for toughening, and with an organically modified organoclay for stiffening were obtained in the melt state. The PNs were highly dispersed and the organoclay was exclusively located in the aPA matrix…
Abstract This study deals with a hybrid system consisting in quaterthiophene derivative encapsulated inside single‐walled and multi‐walled carbon nanotubes. Investigations of the encapsulation step are performed by transmission electron microscopy. Raman spectroscopy data point out different behaviors depending on the…
The increasing degree of control over the nanostructure of materials through novel and refined synthesis pathways is enabling the development of catalysts with improved performance and, at the same time, allows new insights into the catalytic chemistry on a molecular level, thus paving the way to rational catalyst des…
Incorporation of organic functionalities into soft-templated mesoporous alumina was performed via organosilane-assisted evaporation induced self-assembly using aluminum alkoxide precursors and block copolymer templates. This strategy permits one to obtain mesoporous alumina-based materials with tailorable adsorption,…
One-dimensional mathematical models are presented for the free corrosion of a metal surface under a thin electrolyte layer with or without an oxide layer. The models address anodic metal dissolution which is controlled by oxygen diffusion through the electrolyte layer and by the oxygen reduction at the metal surface.…
Kleinste Mengen von Mo-Fremdatomen in einer CaO-Schicht beeinflussen das Wachstumsverhalten von Gold: Während sich auf dem unveränderten Film dreidimensionale Teilchen bilden (oberes STM-Bild), wachsen auf dem dotierten Oxid nur flache Inseln (unten). Die Veränderung der Partikelform wird auf einen Ladungstransfer aus…
Abstract We carried out first‐principles spin‐polarized calculations in order to provide comprehensive information regarding the structural, electronic and magnetic properties of the Pd x Zn 1– x O (with x = 0.0625) semiconductor. The highly accurate all‐electron full‐potential linearized augmented plane wave method w…
Abstract The homogenous nanocomposite films of UV/O 3 oxidized multiwall carbon nanotubes (MWCNTs) subsequently modified with aniline moiety were synthesized with polymethylmethacrylate (PMMA) through free radical polymerization. The phenylamine functional groups present on the surface of MWCNTs providing an anchoring…
Abstract Poly( N ‐vinylcarbazole) (PVK) composites containing different concentrations of multiwalled carbon nanotube (MWCNT) were synthesized through the oxidative polymerization of N ‐vinylcarbazole with ferric chloride. The synthesized composites were characterized using Fourier transform infrared spectroscopy, ult…
在除O_2的0.1 mol/L NaHCO_3,0.1 mol/L NaHCO_3+0.1 mol/L Na_2SO_4以及0.1 mol/L NaHCO_3+0.1 mol/L NaCl溶液中,用恒电位法在低碳钢电极表面制备腐蚀产物,并原位监测低碳钢的开路电位,用SEM观察腐蚀形貌,用XRD确定腐蚀产物的相组成.结果表明.在0.1 mol/L NaHCO_3溶液中,低碳钢的开路电位最终处于再钝化区间,其表面未观察到明显的腐蚀现象;在0.1 mol/L NaHCO_3+0.1 mol/L Na_2SO4溶液中,低碳钢的开路电位最终处于再活化区间,其表面发生均匀腐蚀;在0.1 mol/L NaHCO_3+0.1 mol/L NaCl…
Abstract We have studied the thermal and chemical stability of HiPCO‐produced single‐walled carbon nanotube bundles to high laser power in air and argon. The samples were exposed to 110 kW/cm 2 during 8 h with a 1.96 eV laser and the temperature was monitored via downshift of G + ‐Raman peak. The structural changes in…
Commercial porous membranes as well as in-house fabricated ultraporous nonwoven membranes were tested as separators in aqueous carbon-based supercapacitors. The separators were obtained by electrospinning and melt-blowing of nonwoven nano and microfibers. A pressure-controlled laboratory cell was designed and fabricat…
An investigation on the plasma-induced field emission (PFE) properties of a large area carbon nanotube (CNT) cathode on a 2 MeV linear induction accelerator injector is presented. Experimental results show that the cathode is able to emit intense electron beams. Intense electron beams of $14.9--127.8\text{ }\text{ }\m…
Charge carriers: The p-doping of self-doped poly(anilineboronic acid) (PANI-BA) is studied by in situ electron spin resonance (ESR)/ultraviolet/visible/near-infrared (UV-vis-NIR) spectroelectrochemistry with respect to the role of the ionic side group at the aniline core (see figure). The results point to a primary po…