745746.fig.0015a
(a)
745746.fig.0015b
(b)
745746.fig.0015c
(c)
Figure 15: (a)~(c) The TEM images of a MR fluid containing 12 wt% Fe3O4 nanowires, which were stored at various periods of time: (a) 1 month, (b) 2 months, and (c) 3 months.