@article {252406,
	title = { Colloids with valence and specific directional bonding },
	journal = {Nature},
	volume = {491},
	number = {7422},
	year = {2012},
	pages = {51-55},
	abstract = {The ability to design and assemble three-dimensional structures from colloidal particles is limited by the absence of specific directional bonds. As a result, complex or low-coordination structures, common in atomic and molecular systems, are rare in the colloidal domain. Here we demonstrate a general method for creating the colloidal analogues of atoms with valence: colloidal particles with chemically distinct surface patches that imitate hybridized atomic orbitals, including sp, sp2, sp3, sp3d, sp3d2 and sp3d3. Functionalized with DNA with single-stranded sticky ends, patches on different particles can form highly directional bonds through programmable, specific and reversible DNA hybridization. These features allow the particles to self-assemble into |[lsquo]|colloidal molecules|[rsquo]| with triangular, tetrahedral and other bonding symmetries, and should also give access to a rich variety of new microstructured colloidal materials.},
	url = {http://dx.doi.org/10.1038/nature11564},
	author = {Yufeng Wang and Yu Wang and Dana R. Breed and Vinothan N. Manoharan and Lang Feng and Andrew D. Hollingsworth and Marcus Weck and David J. Pine}
}
