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. 2020 May 8;6(19):eaba5337. doi: 10.1126/sciadv.aba5337

Fig. 6. Manipulation of DLVO interactions by photo-acid generator.

Fig. 6

(A) Plot of interaction energy against interparticle distance: At the initial pH of 5, particles experience repulsion (brown line). Magnetic field induces long-range attraction even at a distance beyond 5 μm (purple dashed line). Exposure to UV light reduces the pH to 2, at which particles experience short-range electrostatic attraction (orange dotted line). (B) Brightfield images and corresponding schematic of the three conditions in the suspension: initial repulsion of negatively charged surfaces, attraction into supraparticle via magnetic field, and permanent locking into DLVO minimum after reversal of surface charge on satellites. Scale bar, 2 μm. (C) False-colored SEM images of dried and recovered structures. Scale bar, 2 μm.