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- W2973309265 abstract "Surface segregation in binary colloidal mixtures offers a simple way to control both surface and bulk properties without affecting their bulk composition. Here, we combine experiments and coarse-grained molecular dynamics (CG-MD) simulations to delineate the effects of particle chemistry and size on surface segregation in photonic colloidal assemblies from binary mixtures of melanin and silica particles of size ratio (Dlarge/Dsmall) ranging from 1.0 to ~2.2. We find that melanin and/or smaller particles segregate at the surface of micrometer-sized colloidal assemblies (supraballs) prepared by an emulsion process. Conversely, no such surface segregation occurs in films prepared by evaporative assembly. CG-MD simulations explain the experimental observations by showing that particles with the larger contact angle (melanin) are enriched at the supraball surface regardless of the relative strength of particle-interface interactions, a result with implications for the broad understanding and design of colloidal particle assemblies." @default.
- W2973309265 created "2019-09-26" @default.
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- W2973309265 date "2019-09-06" @default.
- W2973309265 modified "2023-10-15" @default.
- W2973309265 title "Experimental and theoretical evidence for molecular forces driving surface segregation in photonic colloidal assemblies" @default.
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- W2973309265 doi "https://doi.org/10.1126/sciadv.aax1254" @default.
- W2973309265 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6754227" @default.
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