该研究成果发表于最新一期的《自然》杂志上。作者: small 时间: 2012-11-13 13:02
Materials science: Self-assembly gets new direction
By controlling the placement of 'sticky' patches on particles, assemblies can be made that mimic atomic bonding in molecules. This greatly expands the range of structures that can be assembled from small components http://www.nature.com/nature/journal/v491/n7422/full/491042a.html 作者: small 时间: 2012-11-13 13:03
Colloids with valence and specific directional bonding
he 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 ‘colloidal molecules’ with triangular, tetrahedral and other bonding symmetries, and should also give access to a rich variety of new microstructured colloidal materials. http://www.nature.com/nature/jou ... ll/nature11564.html