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General strategy for qualitatively testing the adhesion of silica particles to functionalized siloxane-based micropillars. (a) preparation of silica particles coated Si substrate; (b) fabrication of SPC-functionalized polysiloxane-based microstructures and activation of catechol; (c) stamping activated catechol-functionalized polysiloxane-based microstructures on coated silica particles; and (d) removal of catechol-functionalized polysiloxane-based film from Si substrate.
