Dynamic Aggregation of Chiral Spinners

An object spinning at the surface of a liquid creates a chiral vortex. If the spinning object is itself chiral, its shape modifies the characteristics of the vortex; interactions between that vortex and other vortices then depend on the chirality of the objects that produce them. This paper describes the aggregation of millimeter-sized, chiral magnetized plates floating at a liquid-air interface and rotating under the influence of a rotating external magnetic field. This external field confines all the plates at densities that cause the vortices they generate to interact strongly. For one set of plates investigated, plates of one chirality attract one another, and plates of the other chirality repel other plates of both chiralities.

[1]  E. Collings.  Magnetic susceptibility of sodium at low temperature , 1965 .

[2]  Robert W. Field,et al.  Perturbations in the Spectra of Diatomic Molecules , 1986 .

[3]  K B Lipkowitz,et al.  Atomistic modeling of enantioselective binding. , 2000, Accounts of chemical research.

[4]  F. Sagués,et al.  Chiral Sign Induction by Vortices During the Formation of Mesophases in Stirred Solutions , 2001, Science.

[5]  Ryoji Noyori,et al.  Asymmetric Catalysis by Architectural and Functional Molecular Engineering: Practical Chemo- and Stereoselective Hydrogenation of Ketones. , 2001, Angewandte Chemie.

[6]  M. Cross,et al.  Pattern formation outside of equilibrium , 1993 .

[7]  George M. Whitesides,et al.  Dynamic self-assembly of magnetized, millimetre-sized objects rotating at a liquid–air interface , 2000, Nature.

[8]  George M. Whitesides,et al.  Modeling of Menisci and Capillary Forces from the Millimeter to the Micrometer Size Range , 2001 .

[9]  T. Havelock,et al.  LII.The stability of motion of rectilinear vortices in ring formation , 1931 .

[10]  George M. Whitesides,et al.  Three-dimensional dynamic self-assembly of spinning magnetic disks: Vortex crystals , 2002 .

[11]  J. Mahdi,et al.  Pharmacological Importance of Stereochemical Resolution of Enantiomeric Drugs , 1997, Drug safety.

[12]  D. Dritschel.  The stability and energetics of corotating uniform vortices , 1985, Journal of Fluid Mechanics.

[13]  H Herken,et al.  Drug Safety , 1980, Medizinische Klinik.

[14]  Sven Erik Jørgensen,et al.  Ecosystems emerging: 2. Dissipation , 1999 .