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Regioselective surface encoding of nanoparticles for programmable self-assembly
Nature Materials ( IF 41.2 ) Pub Date : 2018-12-03 , DOI: 10.1038/s41563-018-0231-1
Gang Chen , Kyle J. Gibson , Di Liu , Huw C. Rees , Jung-Hoon Lee , Weiwei Xia , Ruoqian Lin , Huolin L. Xin , Oleg Gang , Yossi Weizmann

Surface encoding of colloidal nanoparticles with DNA is fundamental for fields where recognition interaction is required, particularly controllable material self-assembly. However, regioselective surface encoding of nanoparticles is still challenging because of the difficulty associated with breaking the identical chemical environment on nanoparticle surfaces. Here we demonstrate the selective blocking of nanoparticle surfaces with a diblock copolymer (polystyrene-b-polyacrylic acid). By tuning the interfacial free energies of a ternary system involving the nanoparticles, solvent and copolymer, controllable accessibilities to the nanoparticles’ surfaces are obtained. Through the modification of the polymer-free surface region with single-stranded DNA, regioselective and programmable surface encoding is realized. The resultant interparticle binding potential is selective and directional, allowing for an increased degree of complexity of potential self-assemblies. The versatility of this regioselective surface encoding strategy is demonstrated on various nanoparticles of isotropic or anisotropic shape and a total of 24 distinct complex nanoassemblies are fabricated.



中文翻译:

用于可编程自组装的纳米粒子的区域选择性表面编码

胶体纳米粒子与DNA的表面编码对于需要识别相互作用(尤其是可控的材料自组装)的领域至关重要。然而,由于与破坏纳米颗粒表面上的相同化学环境有关的困难,纳米颗粒的区域选择性表面编码仍然是挑战性的。在这里,我们展示了用二嵌段共聚物(聚苯乙烯-b-聚丙烯酸)。通过调节涉及纳米粒子,溶剂和共聚物的三元体系的界面自由能,可以获得对纳米粒子表面的可控可及性。通过用单链DNA修饰无聚合物表面区域,可以实现区域选择性和可编程表面编码。所得的粒子间结合势是选择性的和方向性的,从而增加了潜在的自组装的复杂程度。这种区域选择性表面编码策略的多功能性已在各向同性或各向异性形状的各种纳米粒子上得到证明,共制造了24种不同的复杂纳米组件。

更新日期:2018-12-10
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