Stephen Whitelam1

1, Lawrence Berkeley National Lab, Berkeley, California, United States

Peptoids, structural isomers of peptides, can self-assemble into extended, flat nanostructures at an air-water interface. Our molecular dynamics simulations predict that the flatness of nanosheets is made possible by peptoids' ability to associate in a linear and untwisted manner, which in turn is made possible by the ability of residues along the peptoid backbone to adopt alternating, twist-opposed rotational states (by contrast, peptides in beta sheets tend to adopt a single type of rotational state that is slightly twisted, a property transmitted to the sheet as a whole). I will discuss how the choice of rotational state-pairs in the peptoid nanosheet substantially infuences its emergent order, and discuss strategies for functionalizing nanosheets in order to promote mineralization and catalysis. In this sense the nanosheet itself can be considered to be an interface at which reactions occur.