title: Patterned when wet: environment-dependent multifunctional patterns within amphiphilic colloidal crystals.
abstract: A simple integration of molecular and colloidal self-assembly approaches with photopatterning is shown to produce multifunctional patterns of amphiphilic colloidal crystals. These crystals display binary spatial patterns of wettability by water and a single photonic stop-band in air. Upon exposure to water, the uniform stop-band is replaced by a pattern of coexisting stop-bands that reflect the underlying pattern of surface wetting. These hydration-dependent photonic patterns within single colloidal crystals form because of near-complete water rejection from the three-dimensionally disposed nanoscale interstices in hydrophobic regions and its exclusive permeation within the hydrophilic regions. This water permeation pattern is further structured by the three-dimensional (3D) distribution and contiguity of the nanoscale interstices between individual colloids, allowing 3D patterned organization of functional units in secondary self-assembly processes, as illustrated using quantum dots, metal nanoparticles, and fluorescent probes.
authors.affiliation: Department of Applied Science and Biophysics Graduate Group, University of California, Davis, CA 95616, USA.
authors.forename: Adrian M
authors.initials: AM
authors.lastname: Brozell
authors.forename: Michelle A
authors.initials: MA
authors.lastname: Muha
authors.forename: Arian
authors.initials: A
authors.lastname: Abed-Amoli
authors.forename: Daniel
authors.initials: D
authors.lastname: Bricarello
authors.forename: Atul N
authors.initials: AN
authors.lastname: Parikh
mesh_terms: D000388:Air; D003102:Colloids / Q000737:chemistry*; D003460:Crystallization; D008958:Models, Molecular; D017785:Photons; D013053:Spectrophotometry; D014867:Water / Q000737:chemistry*
chemical_list: D003102:Colloids; D014867:Water