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Illustration of mechanism of DPA-MOF motion. (a) before releasing DPA peptides, MOF incorporates DPA peptides on the well-ordered alignment in nanoscale pores, (b) after releasing DPA peptides, the re-assembly of DPA peptides form the hydrophobic domain at the end of MOF particle. Since this domain lowers the surface tension of MOF on the released side, MOF particle moves with surface tension gradient via Marangoni effect.
