title: Subdiffusion of a sticky particle on a surface.
abstract: Conventional diffusion (ΔR2(t))=2Dt gives way to subdiffusion (ΔR2(t))∼t(μ), 0<μ<1 when the waiting time distribution φ(τ) is nonintegrable. We have studied a model system, colloidal particles functionalized with DNA "sticky ends" diffusing on a complementary coated surface. We observe a crossover from subdiffusive to conventional behavior for (ΔR2(t)) and φ(τ) as temperature is increased near the particle-surface melting temperature consistent with a simple Gaussian distribution of sticky ends. Our results suggest that any system with randomness in its binding energy should exhibit subdiffusive behavior as it unbinds. This will strongly affect the kinetics of self-assembly.
authors.affiliation: Center for Soft Matter Research, New York University, New York, New York 10003, USA.
authors.forename: Q
authors.initials: Q
authors.lastname: Xu
authors.forename: L
authors.initials: L
authors.lastname: Feng
authors.forename: R
authors.initials: R
authors.lastname: Sha
authors.forename: N C
authors.initials: NC
authors.lastname: Seeman
authors.forename: P M
authors.initials: PM
authors.lastname: Chaikin
mesh_terms: D001483:Base Sequence; D004247:DNA / Q000737:chemistry* / Q000378:metabolism*; D004058:Diffusion; D006046:Gold / Q000737:chemistry; D008958:Models, Molecular; D011336:Probability; D019809:Streptavidin / Q000378:metabolism; D013499:Surface Properties
chemical_list: D006046:Gold; D004247:DNA; D019809:Streptavidin