  This study compares the growth cycles and spatial distribution of dust cloud
for titania and carbonaceous dusty nanoparticles in capacitively coupled
radiofrequency plasmas, with and without the presence of a weak magnetic field
of approximately 500 Gauss. Findings on cycle time, growth rate, and spatial
distribution of dust cloud are discussed. The growth of nanoparticles in these
plasmas is cyclic, with particles reaching their maximum size and subsequently
moving out of the plasma, followed by the generation of a new particle growth
cycle. The presence of the magnetic field speeds up the growth cycle in both
plasma. The magnetic field also makes the spatial distribution of the two dust
cloud different from each other. Langmuir probe measurement of the background
plasma parameters such as electron temperature and floating potential reveal
radial variations in floating potential but not electron temperature.
Furthermore, the magnetic field changes the radial variation of floating
potential. These measurements, however, are not sufficient to explain why the
two dust clouds appear differently. It is possible that the differences occur
due to a gradient in the radial distribution of the magnetic field.
