胶体飞毯
Colloidal Flying Carpets
摘要：
DNA在聚合物科学中扮演着特殊的角色，这不仅是因为它对互补的DNA单链具有高度的选择性识别，还因为细菌可以表达非常长但完全单分散的DNA链。后一个原因使得长DNA分子被广泛用作高分子科学中的模型体系。在这里，我们报告了不寻常的自组装发生在系统的胶体涂有很长的双链DNA。特别是，我们发现涂有如此长的DNA的胶体可以组装成独特的浮动晶体单层。浮动胶体结构具有潜在的有趣应用，因为这种有序结构可以在一个位置组装，然后沉积在其他地方。这将为组装多组分、分层的胶体晶体开辟道路。
英文摘要：
DNA plays a special role in polymer science not just because of the highly selective recognition of complementary single DNA strands but also because bacteria can express DNA chains that are very long yet perfectly monodisperse. The latter reason makes long DNA molecules widely used as model systems in polymer science. Here, we report the unusual self-assembly that takes place in systems of colloids coated with very long double-stranded DNA. In particular, we find that colloids coated with such long DNA can assemble into unique floating crystalline monolayers. Floating colloidal structures have potentially interesting applications as such ordered structures can be assembled in one location and then deposited somewhere else. This would open the way to the assembly of multi-component, layered colloidal crystals.
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