Synthesis of poly(pyrrole)–silica–magnetite nanocomposite particles

Abstract

UKBN? 9QJPyrrole is polymerised in the presence of ultrafine silica-coated magnetite particles; the resulting colloidal poly(pyrro1e)-silica-magnetite nanocomposites have a conducting polymer content of 75 mass% and exhibit superparamagnetism.

Enantioselective route to an azadirachtin substructure

“…Infrared spectra were recorded on a Perkin-Elmer FT 1710 spectrometer in CHCl 3 as solvent. 1 High resolution mass spectra were taken on a VG Autospec instrument.…”

Colloidal nanocomposite particles: quo vadis?

“…Several potential applications were suggested for polypyrrole--silica nanocomposite particles, including their use as highly coloured marker particles for immunodiagnostic assays 21 and as new synthetic mimics for understanding the behaviour of silicate-based micro-meteorites. 8,9 However, such syntheses suffer from the following disadvantages: (i) they must be conducted in moderately acidic solution (pH 0 to 2) to obtain highly conjugated conducting polymer chains; (ii) due to their highly exothermic nature, they are typically limited to rather low monomer concentrations (typically only 1--3% w/v ); (iii) the reaction solutions are always heavily contaminated with both excess silica sol and spent oxidant salts and hence require time-consuming purification via multiple centrifugation/ redispersion cycles.…”

Recent developments in ceramic nanocomposites

“…These nanocomposites often behave like semiconductors in the temperature range of 235-340 K. Other reports can be found in Another field of interest is polymerglass nanocomposites. 106 Hwang et al 107 reported the potential use of NiO-Ni(OH) 2 nanocomposites as humidity sensors, though the mechanism of humidity sensors by this kind of material is not completely understood at present.…”