0000000001331960
AUTHOR
J Alamo
Mechanism of large oscillations of anodic potential during anodization of silicon in H3PO4/HF solutions
Abstract Effect of large oscillations of electrical potential during anodic polarization of silicon in electrolytes composed of phosphoric and hydrofluoric acids has been reported. The oscillations last hours without damping if experimental conditions are optimal. Changes of temperature, anodic current density, intensity of stirring, etc. quench them or convert into less periodic ones. The oscillations are of very high amplitude (typically 15 V) with a period ranging from 18 to 30 s. Scanning electron microscopy (SEM)-imaging of the samples experiencing the oscillatory kinetic behaviour shows unambiguously that the stage of the anodic voltage growth is assisted by the formation of a thin (5…
Dealing with interruptions in text-based chat sessions
Running a teaching session that achieves its aims and objectives requires organised and structured dialogue between teacher and students that leaves room for a clear line of instructions. However, participants can disrupt the flow and prevent the achievement of these objectives through constant interruption (via questions or comments). The interruptions mentioned here include any discursive interaction that halts the flow of the argument and causes distraction for teacher and students.