Materials Literature
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Differently sized and shaped nanocrystals of water-soluble magnetite were prepared by refluxing FeCl3⋅6 H2O in 2-pyrrolidone for different periods of time. The picture (scale bar: 100 nm) shows how first spherical nanoparticles appear (1 h, a), grow (10 h, b), and finally form cubic particles (24 h, c). The mechanism…
Electric light orchestra! Enhanced photocurrents are generated in an assembly that consists of CdS nanoparticles linked to a gold electrode by carbon nanotubes (see picture, TEOA=triethanolamine). The enhanced photocurrents are attributed to the effective transport of conduction-band electrons through the carbon nanot…
The interaction of light with silver nanoparticle arrays can in some cases produce mixed plasmonic/photonic bands that have extremely narrow (<1 meV) line shapes in extinction and scattering. In this paper we extend computational electrodynamics results of a recent communication [S. Zou, N. Janel, and G. C. Schatz, J.…
Single crystal ZnO nanowires are synthesized and configured as field-effect transistors. Photoluminescence and photoconductivity measurements show defect-related deep electronic states giving rise to green-red emission and absorption. Photocurrent temporal response shows that current decay time is significantly prolon…
The conditions prevailing during the nucleation stage of the thermoplastic foam extrusion process in which a physical foaming agent is involved are one of the key steps in the design and optimization of the process. The conditions that induce phase separation and bubble nucleation are obviously linked to the solubilit…
This paper focuses on formability study of recycled polymeric matrix composites. Two thermoplastics are selected to create the composite, i.e. polyethylene terephthalate (PET) and high density polyethylene (HDPE). The recycling process is thermo-mechanical, and no addition of co-polymers, anti-oxidants or additives is…
Abstract [Mn(en) 3 ] 2 [Ge 4 O 6 Te 4 ]·1.5en ( 1 ) and (enH) 3 [Mn(en) 3 ] 3 [Ge 4 O 6 Te 4 ] 2 I·4.7en ( 2 ) may be prepared at 150 °C by solvothermal reaction of elemental Ge and Te with Mn(OOCCH 3 ) 2 ·4H 2 O in the presence of [CH 3 ) 4 N]I as a mineralizer in respectively superheated ethylenediamine (en) or an e…
We calculate the x-ray diffraction spectrum produced by a pinned charge density wave (CDW). The signature of the presence of a CDW consists of two satellite peaks, asymmetric as a consequence of disorder. The shape and the intensity of these peaks are determined in the case of a collective weak pinning using the varia…
In this work, the sol-gel process in non-aqueous system of tetraethylorthosilicate (TEOS) has been investigated. The formation of spherical silica nanoparticles was studied using 1H and 13C NMR, FTIR spectroscopies and TEM. It was demonstrated that FTIR, TEM and 1H NMR can be employed to monitor effectively the conver…
The sonoelectrochemical degradation of cyanide ions (CN-) in the presence of 6 types of electrodes (aluminium, titanium, nickel, copper, stainless steel (inox), and graphite) were investigated in order to emphasise the influence of the electrode type on the efficiency of the degradation process.
We report a polarity-sensitive electro-optical response observed in nematic liquid crystal cells characterized by asymmetric insertion of thin films of titania-vanadia oxide with a Ti∕V atomic ratio of 1∕1, prepared by sol-gel synthesis on transparent indium tin oxide. The electro-optical effect is opposite to previou…
A model of the quasi-Debye loss mechanism in SrTiO3 and Ba0.6Sr0.4TiO3 perovskite ferroelectrics at microwave frequencies is presented. The field dependence and the size of the field-induced quasi-Debye loss contribution in SrTiO3 and Ba0.6Sr0.4TiO3 systems have been evaluated in the simple approximation of the isotro…
Ordered mesoporous TiO2–NiTiO3 thin films, with nickel content x < 0.5, were prepared by dip-coating an acidic solution of hydrolysed transition metal chlorides in controlled humidity, followed by a very careful annealing treatment. These latter treatments were studied by in situ SAXS-WAXS experiments involving synchr…
The analysis of detailed magnetization measurements, supplemented by zero-field ac susceptibility data, on single-crystal ${\mathrm{La}}_{0.73}{\mathrm{Ba}}_{0.27}{\mathrm{MnO}}_{3}$ indicates the occurrence of a continuous ferromagnetic-to-paramagnetic phase transition at 245 K. This transition is characterized by ex…
A series of composite materials based on a hydrophobic mesoporous silica (MCM-41-m) filled polytetrafloroethylene (PTFE) were synthesized. The composite boards prepared from the composite materials were thermally stable The dielectric constant and z -axis coefficient of thermal expansion were significantly decreased w…
Abstract The ultrasonic treatment of butyl rubber gum during extrusion with a grooved‐barrel ultrasonic reactor was carried out at a mean residence time of 3.6 s and at different ultrasonic amplitudes. Gel permeation chromatography, NMR spectroscopy, differential scanning calorimetry, thermogravimetric analysis, and d…
We studied the luminescence properties of Eu 2 + in CaAl 2 Si 2 O 8 . In CaAl 2 Si 2 O 8 : Eu 2 + phosphor, two emission bands were observed. Because the two emission bands of CaAl 2 Si 2 O 8 : Eu 2 + phosphor are quite different, it can be presumed that Eu 2 + ions occupy two types of sites, namely, Eu 1 and Eu 2 . T…
It is well known that rigid dipolar solutes (in smaller quantity) dispersed in a nonpolar glassy matrix exhibit a sub-T(g) (or beta(s)) relaxation due to the solute often designated as Johari-Goldstein (JG) relaxation, which is intermolecular in nature. In this article, we report the results of our study of such a sub…
Abstract Covalently bonded layered silicated/polystyrene nanocomposites were synthesized via atom transfer radical polymerization in the presence of initiator‐modified layered silicate. The resulting nanocomposites had an intercalated and partially exfoliated structure, as confirmed by X‐ray diffraction and transmissi…
Abstract (enH 2 )[{Mn(en) 2 (enH)} 2 (μ‐en)](Ge 2 Se 7 ) 2 ( 1 ) and [Mn(dien) 2 ] 2 Ge 2 Se 7 ( 2 ) can be prepared by solvothermal reaction of elemental Ge and Se with Mn(OOCCH 3 ) 2 ·4H 2 O in respectively superheated ethylenediamine/methanol (3:2 mixture, 150°) and diethylenetriamine (dien, 130 °C). The cyclic Ge…