Directed Growth of Virus Nanofilaments on a Superhydrophobic Surface
De Angelis, Francesco
Di Fabrizio, Enzo M.
KAUST DepartmentAnalytical Chemistry Core Lab
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2015-01-20
Print Publication Date2015-06-17
Permanent link to this recordhttp://hdl.handle.net/10754/566099
MetadataShow full item record
AbstractThe evaporation of single droplets of colloidal tobacco mosaic virus (TMV) nanoparticles on a superhydrophobic surface with a hexagonal pillar-pattern results in the formation of coffee-ring type residues. We imaged surface features by optical, scanning electron, and atomic force microscopies. Bulk features were probed by raster-scan X-ray nanodiffraction. At ∼100 pg/μL nanoparticle concentration, the rim of the residue connects to neighboring pillars via fibrous extensions containing flow-aligned crystalline domains. At ∼1 pg/μL nanoparticle concentration, nanofilaments of ¥80 nm diameter and ∼20 μm length are formed, extending normal to the residue-rim across a range of pillars. X-ray scattering is dominated by the nanofilament form-factor but some evidence for crystallinity has been obtained. The observation of sheets composed of stacks of self-assembled nanoparticles deposited on pillars suggests that the nanofilaments are drawn from a structured droplet interface. © 2015 American Chemical Society.
PublisherAmerican Chemical Society (ACS)