Physico-chemical characterization of surfactants dissolved in HFE 7500 obtained by the pendent drop method with de-ionized water. HFB: Hydrophilic–Fluorophilic Balance.

Surfactant in HFE 7500	HFB	τ equilibrium (min)	γ CMC (% wt)	γ CMC (mN m−1)
PFPE–PEG	0.98	0.2	0.6	5.1
Click PFPE–PEG	0.98	0.9	0.3	8.6
3-arm PFPE–PEG star	1.08	0.2	>30	<16.4
Brush-like PFPE–PEG	1.02	3.4	1.3	10.6
Hyperbranched PFPE–PEG	2.05	5.6	1.5	16.4