Role of inter-micellar interaction on micellar growth

Small angle neutron-scattering and viscosity measurements from 0.1 M CTAC solutions with varying concentrations of KBr (C = 0.0 to 0.1 M) and KCl (C = 0.0-1.0 M) are reported. When compared with similar data on CTAB solutions, these data suggest that the difference in the micellar growths in the above systems is not connected with the common ion effect. It has been found that the inter-micellar interactions in CTAC/KCl and CTAC/KBr are different and that leads to differences in the growth of micelles

Zinc oxide hierarchical nanostructures as potential NO2 sensors

A superficial thermal evaporation method has been employed for the fabrication of hierarchical zinc oxide (ZnO) nanostructured films, composed of nanorods (NR's) and bunch of nanowires (BNW's), on glass substrate and the diverse atmospheric annealing effect on their structural, morphological, compositional, and gas sensing properties has been systematically studied and reported. Structural investigation corroborates the formation of crystalline hexagonal wurtzite ZnO. The arrays of vertically aligned nanorods and bunch of nanowires of ZnO were observed on the substrate surface. As-prepared ZnO NR's and BNW's are utilized as a sensing material for detection of toxic nitrogen dioxide (NO2). The ZnO sensors exhibit high response to NO2 along with rapid response and recovery time values @200 degrees C. In addition, ZnO sensors respond to a very small exposure of NO2 gas i.e. 1 ppm. Furthermore, the developed sensors attain excellent stability and reproducibility in response. Finally, the interaction of NO2 gas molecules with hierarchical nanostructured ZnO sensors has successfully been studied and discussed by employing an electrochemical impedance spectroscopy measurement