Enantiodiscrimination through Oriented Attachment: Formation of   Homochiral Crystal Aggregates from a Racemic System
  We show that D- and L-enantiomorphous crystals of NaBrO3 in equilibrium with the corresponding solution, self-aggregate leading to large crystal assemblies. Surprisingly, crystal-to-crystal interaction is not a random process and takes place with nearly complete enantioselection (chiral recognition) thereby providing homochiral aggregates. There is in addition a crystallographic directionality and many aggregates grow as a whole. The process can be extended to enantiomorphous NaClO3 crystals under milder conditions as well as crystals of inherently chiral molecules such as a proteinogenic amino acid. 
Cristobal Viedma* and Pedro Cintas
cond-mat.mtrl-sci cond-mat.soft