Materials Literature
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In this work we investigated the antibacterial properties of differently shaped silver nanoparticles against the gram-negative bacterium Escherichia coli, both in liquid systems and on agar plates. Energy-filtering transmission electron microscopy images revealed considerable changes in the cell membranes upon treatme…
Doping of lithium (Li+) cations results in stabilised zirconia, especially in tetragonal (t) crystal structure, i.e., Li+: t-ZrO2. It is useful to vary oxygen vacancies in Li+: ZrO2 powders. The Li+: t-ZrO2 powder having 1-5 mol per cent Li+, are obtained by using a novel chemical method of a polymer precursor, which…
Strontium barium niobate (SBN) is tetragonal tungsten bronze structured ferroelectric material.It is one of the few lead-free ferroelectrics in the fore-front of environment-friendly electroceramicresearch and development. The unusual sintering behaviour of SBN exhibits abnormal graingrowth, duplex microstructure, and…
Single crystal of Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 (PZN-PT) at the composition of morphotropicphase boundary (MPB) shows a very high electromechanical coupling coefficient, piezoelectriccoefficient, and dielectric constant compared to conventional PZT ceramics. These exceptionalproperties of these single crystals find eno…
Electromechanical properties versus polarization and vibration directions of Pb((Zn1/3Nb2/3)0.955Ti0.045)O3 single crystals grown by the modified Bridgman method, Benayad, Abdelmjid, Hajjaji, Abdelowahed, Guiffard, Benoit, Lebrun, Laurent, Guyomar, Daniel
An original model by Mutoti in 2003 was developed mathematically, and empirically, to predict the increase in total iron concentration in distribution systems. This model, referred to as a flux model, relates the increase in iron concentration in a reach of unlined or galvanized iron pipe to the surface area of the pi…
Analytical and numerical models of capillary barrier performance commonly use hydraulic characteristics measured using pure water. However, the potential exists for an infiltrating solution to have a surface tension lower than that of pure water due to the presence of surface-active contaminants (surfactants). A lower…
The processing conditions, microstructure, and dielectric properties of strontium bismuthtitanate (SBT) were systematically studied. The specimen was synthesised by a mechano-chemicalprocessing route using a planetary ball mill. It is important that the action is vigorous enoughto break up loose aggregates and a fine…
Ende der Expedition …︁ fürs Erste: Die erste gelungene Totalsynthese von Phalarin aus einem in der Sequenz späten Umlagerungsprodukt (siehe Schema, Ts=Toluol-4-sulfonyl) brachte interessante Schwierigkeiten zum Vorschein. Mithilfe der Gassman-Oxindolsynthese und weiterer Schritte wurde der racemische Naturstoff erhalt…
Adhesive polypeptide containing the key component of mussel adhesive protein was synthesized by ring-opening polymerization, and a hybrid material of the adhesive polypeptide and chitosan was prepared through the solution method. Some strong hydrogen bond interaction existed, but without the chemical bond between chit…
Using classical constant-pressure molecular dynamics simulations and the force constants model, radial breathing mode (RBM) transition of single-wall carbon nanotubes under hydrostatic pressure is reported. With the pressure increased, the RBM shifts linearly toward higher frequency, and the RBM transition occurs at t…
Large optical activity has recently been observed in chiral smectic liquid crystalline phases formed from achiral bent-core molecules. The origin of the optical activity remains unclear and has been attributed to both a helical superstructure and the layer chirality produced by simultaneous tilt and polar ordering of…
Lieber rot als blau: Luminol chemiluminesziert mit wunderschöner blauer Farbe, doch um in biotechnologischen Anwendungen nützlich zu sein, muss die Emission zu viel längeren Wellenlängen verschoben werden. Energietransfer-Kassetten wie die im Bild gezeigte bieten eine mögliche Lösung.
Drying of textiles is one of the energy-intensive unit operations and stenters are the most widely used drying machines in textile finishing mills. This study reveals energetic and exergetic analysis of a stenter system in a textile finishing factory based on actual operational data. The system includes a stenter alon…
Following on the recent experimental demonstration of a discrepancy between the nonlinear optical (NLO) behavior of several pi-conjugated chromophores and their assumed octupolar symmetry, the authors investigate how geometrical distortions influence the NLO response of multipolar push-pull molecules. Their analytical…
There is currently great interest in combining focused ion beam (FIB) and scanning electron microscopy technologies for advanced studies of polymeric materials and biological microstructures, as well as for sophisticated nanoscale fabrication and prototyping. Irradiation of electrically insulating materials with a pos…
To gain insight into the effects of liquid-liquid phase separation on molecular relaxation behavior we have studied an apparently homogeneous mixture of 5-methyl-2-hexanol and isoamylbromide by dielectric spectroscopy over a broad temperature range. It shows two relaxation regions, widely separated in frequency and te…
Palladium-doped double-walled silica nanotubes (SNTs) were synthesized by sol−gel transcription, and H 2 adsorption experiments were carried out at 298 K. The H 2 -storage capacities of the palladium-doped SNTs were 0.15 wt % for SNT-5, 1.90 wt % for SNT-10, and 0.75 wt % for SNT-15, showing that the palladium-doped t…
Informationsübertragung: Ein Hybridgel aus π-konjugierten Oligo(p-phenylenvinylen)-Bändern (OPV1 und OPV2) und Goldnanopartikeln wurde in Toluol mithilfe nichtkovalenter Wechselwirkungen aufgebaut (siehe Bild). Die enge Nachbarschaft der Metallpartikel zu den π-konjugierten Molekülen führt zu einer Übertragung von ele…
A new intermediate temperature mixed conducting material has been fabricated based on acceptor doping of bismuth ferrite (BiFeO 3 ). Acceptor doping at levels of 5 mol % with either Ca or Sr was found to increase the maximum operating temperature of ceramics by more than 100 °C as well as eliminate secondary phase for…