Materials Literature
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The use of gold nanoparticles as biological probes requires the improvement of colloidal stability. Dihydrolipoic acid (DHLA), a dithiol obtained by the reduction of thioctic acid, appears therefore very attractive for the stabilization and the further functionalization of gold nanoparticles because DHLA is characteri…
Thin p-type Sb-doped ZnO films were grown by filtered vacuum arc deposition (FVAD), on untreated glass samples. The arc cathode was prepared by dissolving Sb into molten Zn. The deposition was performed with 200 A arc current, running for 120-240 s in 0.426 Pa oxygen pressure. The film thickness was 330-500 nm. The ao…
Novel columnar liquid crystalline compounds N,N'-bis(3,4,5-trialkoxylphenyl)ureas 1a-c (R = n-C(8)H(17), n-C(12)H(25), and n-C(16)H(33)) were synthesized, and their phase transitions were measured by differential scanning calorimetery. The superstructures were investigated by X-ray diffraction, polarized light optical…
Nanotube arrays of amorphous vanadium pentoxide (V(2)O(5)) were synthesized via template-based electrodeposition, and its electrochemical properties were investigated for Li-ion intercalation applications. The nanotubes have a length of 10 microm, outer diameter of 200 nm and inner diameter of 100 nm. Electrochemical…
We use near-field Raman imaging and spectroscopy to study localized vibrational modes along individual, single-walled carbon nanotubes (SWNTs) with a spatial resolution of 10-20 nm. Our approach relies on the enhanced field near a laser-irradiated gold tip which acts as the Raman excitation source. We find that for ar…
This paper compares the kinetics of exchanges of phenylethanethiolate ligands (PhC2S-) of the monolayer-protected clusters (MPCs) Au(38)(SC2Ph)(24) and Au(140)(SC2Ph)(53) with p-substituted arylthiols (p-X-PhSH), where X = NO(2), Br, CH(3), OCH(3), and OH. First-order rate constants at 293 K for exchange of the first…
The SiO(2)/polystyrene nanocomposite particles were synthesized through miniemulsion polymerization by using sodium lauryl sulfate surfactant (SLS), hexadecane costabilizer in the presence of silica particles coated with methacryloxy(propyl)trimethoxysilane. Core-shell or other interesting morphology composite particl…
The polaron features due to electron-phonon interactions with different coupling ranges are investigated by adopting a variational approach. The ground-state energy, the spectral weight, the average kinetic energy, the mean number of phonons, and the electron-lattice correlation function are discussed for the system w…
Kovalent gebunden: Das Polyoxometallat (nBu4N)3[(MeO)TiW5O18] lässt sich einfach an Alkanol-funktionalisierten Oberflächen von porösem und einkristallinem Silicium verankern (siehe Bild, Polyeder: Polyoxometallat, dunkelblau: Si-Oberfläche). Rastertunnelmikroskopisch wurden auf funktionalisiertem Si(111) Inseln mit 35…
The dynamic viscoelastic relaxation behavior and the molecular mobility of a series of hyperbranched poly( ε -caprolactone)s (HPCLs) possessing molecular architectural variation and their linear counterpart, linear poly( ε -caprolactone) (LPCL), were characterized and evaluated in conjunction with their specific molec…
Excitation and emission spectra of Sr(SCN) 2:Eu 2+ at different temperatures are presented. A strong bright green emission due to 4f 6 5d 1 → 4f 7 transitions is observed at low temperature. The spectra of this new kind of host lattices are compared to those of sulfides and nitrides. This comparison shows that the inf…
Carbon−silica nanocomposites are fabricated from the pyrolysis of polyacrylonitrile (PAN), which has been photopolymerized in the ∼7 nm voids of porous Vycor glass. The effect of the pores on the pyrolysis process was investigated by thermal analysis. Temperatures at which key processes in the pyrolysis of bulk PAN oc…
Liquid-crystalline properties of the ionic self assembled complex benzenehexacarboxylic- (didodecyltrimethylammonium)6 [BHC- (C12D)6] were investigated by polarizing microscopy, differential scanning calorimetry (DSC), x-ray analysis, null ellipsometry, UV and IR spectroscopy. The complex exhibits a bilayer smectic Sm…
Spot the difference: Oxidation of propane/CO mixtures is efficiently catalysed by mixed perovskite oxides heated directly using microwave irradiation (see figure). A set of twelve catalysts is screened for activity, selectivity and stability towards SO2 poisoning. LaSrMn shows good activity, selectivity and heating ca…
Although Li 3 N can theoretically absorb as much as about 10 wt % hydrogen, its reversible hydrogen capacity is only about 5.5 wt % because only a fraction of the hydrogen absorbed can be desorbed at relatively low temperatures. In the present paper, it is shown that the addition of LiNH 2 to Li 3 N constitutes an eff…
Pb Zr 0.52 Ti 0.48 O 3 (PZT) films of thickness ∼1μm prepared by a sol-gel process were wet-chemically patterned using an economical and effective etch process. The etch recipe provided excellent etch control, minimized undercut, preserved the photoresist mask, and effectively removed the residues on the etched surfac…
We report a joint computational and luminescence study on the low-lying excited states of sym-triazines, namely, 1,3,5-triazine (1) and the ubiquitous herbicides atrazine [6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine (2)] and ametryn [6-methylthio-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine (3)]. Geo…
Polymerization and patterning of a conductive polymer thin film via a new approach involving a well-ordered polymer matrix previously obtained using a liquid-crystalline template is reported here. The resulting conductive polymer (PEDOT, poly(3,4-ethylenedioxythiophene)) was shown by scanning electron microscopy (SEM)…
The effect of surface treatments on p-CdTe/n-CdS solar cell performance was examined. Adsorption of organic molecules with various magnitudes and directions of the dipole moment on p-CdTe resulted in controlled changes in electron affinity and surface bond bending. Similar adsorption on CdTe in state-of-the-art p-CdTe…
Single phase (Sb 1 - x Pb x ) 2 (Mn 1 - y Sb y )O 4 (0.0 ≤ x ≤ 0.608, 0.0 ≤ y ≤ 0.372) samples with the Sb 2 MnO 4 −type structure were prepared at 650 °C by solid-state reaction in evacuated sealed silica tubes. A replacement of Sb by Pb results in the oxidation of Sb 3+ to Sb 5+, which in turn replaces Mn 2+ cations…