Deposition of composite coatings from particle-particle and particle-yeast blends by convective-sedimentation assembly.

摘要: Abstract The structures resulting from convective-sedimentation assembly (CSA) of bimodal suspensions (4.1–10% solids) strongly charged sulfate latex microspheres (zeta potential −55.9 ± 1.8 mV at pH 8.0) and weakly Saccharomyces cerevisiae −18.7 ± 0.71 mV on glass, polyester, polypropylene, aluminum foil substrates was evaluated. This study shows how substrate wettability, suspension composition, particle size ratio surface charge affect the deposition process coating microstructure (particle ordering void space). Size influence deposition, convective mixing or demixing relative locations. Substrate wettability composition by controlling delivery spreading across substrate. S. behave like negatively-charged colloidal particles during CSA. CSA particle–yeast blends result in open-packed (15–45% mean space), instead tightly packed coatings attainable with single component systems, confirming existence significant polymer interactions formation aggregates that disrupt deposition. Further optimization should allow space reduction cells plus adhesive into monolayer for biosensors, biophotoabsorbers, energy applications, highly reactive microbial absorbers.