title: Self-assembly of rodlike virus to superlattices.
abstract: Rodlike tobacco mosaic virus (TMV) has been found to assemble into superlattices in aqueous solution using the polymer methylcellulose to induce depletion and free volume entropy-based attractive forces. Both transmission electron microscopy and small-angle X-ray scattering show that the superlattices form in both semidilute and concentrated regimes of polymer, where the free volume entropy and the depletion interaction are the dominant driving force, respectively. The superlattices are NaCl and temperature responsive. The rigidity of the rodlike nanoparticles also plays an important role for the formation of superlattices through the free volume entropy mechanism. Compared to the rigid TMV particle, flexible bacteriophage M13 particles are only responsive to the depletion force and thus only assemble in highly concentrated polymer solution, where depletion interaction is dominant.
authors.affiliation: X-ray Science Division, Advanced Photon Source, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Xingjie
authors.initials: X
authors.lastname: Zan
authors.forename: Yong
authors.initials: Y
authors.lastname: Sun
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Zuo
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Li
authors.forename: Andrew
authors.initials: A
authors.lastname: Senesi
authors.forename: Randall E
authors.initials: RE
authors.lastname: Winans
authors.forename: Qian
authors.initials: Q
authors.lastname: Wang
authors.forename: Byeongdu
authors.initials: B
authors.lastname: Lee
mesh_terms: D019277:Entropy; D008747:Methylcellulose / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry; D012996:Solutions; D013499:Surface Properties; D013696:Temperature; D014027:Tobacco Mosaic Virus / Q000737:chemistry* / Q000648:ultrastructure; D014867:Water / Q000737:chemistry
chemical_list: D011108:Polymers; D012996:Solutions; D014867:Water; D012965:Sodium Chloride; D008747:Methylcellulose