Freestanding Block Copolymer Membranes with Tunable Pore Sizes Promoted by Subnanometer Nanowires

Author:

Ouyang Wanyue1ORCID,Zhang Simin2ORCID,Wang Xun1ORCID

Affiliation:

1. Key Lab of Organic Optoelectronics and Molecular Engineering Department of Chemistry Tsinghua University 100084 Beijing China

2. MOE Key Laboratory of Cluster Science Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 102401 China

Abstract

AbstractBlock copolymers (BCPs) have enduring appeal for its intriguing assembly behaviors. Nevertheless, the unsatisfactory mechanical properties of BCPs make it a problem to fabricate freestanding membranes and hindered practical applications. Herein, a freestanding membrane with tunable pore size is prepared simply by co‐assembly of BCPs and subnanometer nanowires (SNWs), combining the abundant function of BCPs and prominent mechanical properties of SNWs. Benefited from synergy of the components and the hierarchical structure, the tensile strength of composite membrane is promoted by two orders of magnitude compared to that of BCPs. With the columnar pores aligning vertically to surfaces and the pore size regulated by processing conditions, the membranes exhibit precise size‐selected effect in ultrafiltration of Au nanoparticles (Au NPs) and can distinct NPs with diameter difference as tiny as 5 nm, demonstrating the promising prospect in separation technology and even widespread fields.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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