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a) Illustration showing how dehydration of the core of the hollow tube could lead to extension of the length. b) Stills from a video showing solutions of 2NapFF (10 mg mL−1; pH 11) being pushed out of a syringe. Left, after ca. 0.3 mL has been pressed out; right, after ca. 0.7 mL has been pushed out. In both cases, the solution on the left has been exposed to a heat/cool cycle and the solution on the right has not. Scale bar=2 cm.
