  A robust route for the biased production of single-handed chiral structures
has been found in generating non-spherical, multi-component double emulsions
using microfluidics. The specific type of handedness is determined by the final
packing geometry of four different inner drops inside an ultra-thin sheath of
oil. Before three-dimensional chiral structures are formed, the
quasi-one-dimensional chain re-arranges in two dimensions into either
checkerboard or stripe patterns. We derive an analytical model predicting which
pattern is more likely and assembles in the least amount of time. Moreover, our
dimensionless model accurately predicts our experimental results and is based
on local bending dynamics, rather than global surface energy minimization. This
better reflects the underlying self-assembly process which will not, in
general, reach a global energy minimum. In summary, using glass microfluidic
techniques for channeling aqueous fluids through narrow orifices of multi-bore
injection capillaries while encapsulating these fluids as drops inside an
ultra-thin sheath of oil is sufficient to produce single-handed chiral
structures.
