According to an old but still unproven theory, Viking navigators analysed the skylight polarization with dichroic cordierite or tourmaline, or birefringent calcite sunstones in cloudy/foggy weather. Combining these sunstones with their sun-dial, they could determine the position of the occluded sun, from which the geographical northern direction could be guessed. In psychophysical laboratory ex...

A well attached coating of nitrogen-functionalised carbon nanofibers (N-CNFs) has been prepared on the walls of cordierite monolith channels. It is formed via concurrent decomposition of ethane and ammonia catalysed by nickel nanoparticles dispersed on alumina coated cordierite monolith. N-CNF/monoliths synthesis employing several growth temperatures and NH(3) compositions was exhaustively char...

In this study, a composite of bioactive glass (BG) and cordierite (BG-cord) was proposed to increase the strength bioactivity BG. Both BG were separately synthesized with method melting, then, they used fabricate BG-cord variation sintering temperature (600 1000 °C). The highest diametral tensile (DTS=30.54 MPa) shown by at 925 ºC. Bioactivity tests conducted soaking in Hank’s balanced salt sol...

Electric dipoles of water molecules, enclosed singly in regularly spaced nanopores a cordierite crystal, become ordered at low temperature due to their mutual interaction and show the frequency dependence dielectric susceptibility, typical for relaxor ferroelectrics, according recent experimental data. The corresponding phase transition is accompanied by anomalies thermodynamic quantities, such...

Qualitative and quantitative studies of surface nucleation and growth were carried out with a glass having a composition close to Anorthite (CaO.Al2O3.2SiO2). Quasi-isometric hexagonal and elongated hexagonal crystals assumed to belong to the same phase, and a few rectangular crystals were observed after continuous or cumulative (intermittent) thermal treatments. The EDS analysis revealed that ...

Honeycomb cordierite-based Mn–Ce/Al2O3 catalysts were prepared by the impregnation method and used for low-temperature selective catalytic reduction (SCR) of NOx with NH3, with and without SO2 and/or H2O in a homemade fixed-bed tubular reactor. The catalyst reached nearly 80% NOx conversion at 100 ◦C in the absence of SO2. However, SO2 reduces the catalytic activity (80% to 72%) of the honeycom...