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SJTU Students Advanced Artificial Preparation of Highly Complex Nanostructures

April 17, 2020      Author: Zhao Xi’an

On April 9, Jiang Wenfeng, a doctoral student in Professor Zhou Yongfeng's research team from the School of Chemistry and Chemical Engineering (SCCE), SJTU, published a paper titled "Emergence of complexity in hierarchically organized chiral particles" in Science as a "First Release". This paper presents their latest research findings and was completed in collaboration with Professor Nicholas A. Kotov and other researchers from the University of Michigan. This research was supported by the University of Michigan, SCCE and Frontiers Science Center for Transformative Molecules of SJTU, and the China Scholarship Council.

 

Abstract

The structural complexity of composite biomaterials and biomineralized particles arises from the hierarchical ordering of inorganic building blocks over multiple scales. While empirical observations of complex nanoassemblies are abundant, physicochemical mechanisms leading to their geometrical complexity are still puzzling, especially for non-uniformly sized components. Here we report the assembly of hierarchically organized particles (HOPs) with twisted spikes and other morphologies from polydisperse Au-Cys nanoplatelets. The complexity of Au-Cys HOPs is higher than biological counterparts or other complex particles as enumerated by graph theory methods. Their intricate organization emerges from competing chirality-dependent assembly restrictions that render assembly pathways primarily dependent on nanoparticle symmetry rather than size. These findings and HOPs phase diagrams open a pathway to a large family of colloids with complex architectures and unusual chiroptical and chemical properties.

Link: https://science.sciencemag.org/content/early/2020/04/08/science.aaz7949



Translated  by Zhou Rong     Reviewed by Wang Bingyu