![]() ![]() Depending on various parameters (chiefly E and the cooling rate), the droplets can grow as large as several tens of micrometers in radius ( 20). By controlling temperature, we effectively have direct control of droplet volume. Upon slow cooling to room temperature (23☌), phase separation occurs, causing nucleation and growth of fluorinated-oil droplets within the silicone gel over a time scale of tens of minutes (e.g., Fig. The gels were immersed in a fluorinated oil (Fluorinert FC-770, Fluorochem) that is partially soluble in silicone and then incubated at 40☌ for several hours to allow sample saturation. ![]() The resulting gels are highly elastic, showing no evidence of a Mullins effect up to the point of failure in tensile tests consisting of repeated loading/unloading cycles of increasing amplitude (see the Supplementary Materials). We created silicone gel samples by mixing silicone polymer chains with different amounts of cross-linker to produce gels with a range of Young’s moduli from E = 71 − 800 kPa. We nucleated and grew liquid inclusions in silicone gels using the technique shown schematically in Fig.
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