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. Author manuscript; available in PMC: 2013 Feb 28.
Published in final edited form as: Langmuir. 2012 Feb 14;28(8):3766–3772. doi: 10.1021/la204510h

Figure 3.

Figure 3

(A) The polymer volume fraction of two interacting PEG coated microbubbles at a separation where the two microbubbles have a net repulsion of W=5kBT. The positions of the two microbubbles are indicated by the dotted (PEG2K) and dashed (PEG5K) lines. The variable z corresponds to the axis connecting the two microbubbles and z is measured from the midplane between the microbubbles. (B) The free energy as function of separation between two microbubbles. The radius of the microbubbles is R=1 µm and the surface coverage is σ=0.20 nm−2.