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Fig. 17@a) Structure of hydrogelator 12.

b) Photographs of photo responsive gel]sol transition for 10min UV irradiation.

c) 1H-NMR spectra of the gel state before UV irradiation and the sol state after UV irradiation.

d) TEM images of the gel state and the sol state stained with uranyl acetate solution.

e) Photo gel-sol patterning with man-made photo-masks.
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