The authors made a copper-containing MOF loaded with diphenylalanine (DPA) peptides. When the MOFs are placed in an EDTA solution, EDTA chelates copper out of the MOF, releasing DPA in a controlled unidirectional manner. The DPA self-assembles at the MOF/water interface into a region of lower surface tension. The MOFs then move away from the self-assembled DPA toward the region of higher surface tension, as per the Marangoni Effect. MOF lifetime and velocity increase with increasing DPA loading.
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