TEM images of freeze-fractured replica of 1% NaCl solution containing O2 MNBs. Scale bar indicates 200 nm. (a) Precipitated fine impurity particles (10 to 60 nm in diameter) and MNBs (200 and 300 nm in diameter) coexisted at the grain boundary of ice crystallites. Some fine particles were located around small MNBs but did not cover the entire bubble surface. (b) Replica sample of 1% NaCl solution without MNBs shown as a control.
Uchida et al. Nanoscale Research Letters 2011 6:295 doi:10.1186/1556-276X-6-295