Like dissolves like: Bisureas containing environmentally benign CO2-philic groups derived from peracetylated gluconic acid dissolve in supercritical CO2 at 298 K and 62 MPa. Upon depressurization of the CO2, the initially powdery bisureas (left image) form microfibrillar foams (right image).
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Paik et al. (2007) studied this question.
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