Precise and Controllable Assembly of Block Copolymers^†

Abstract

Bixin Jin received his PhD degree in Material Science and Engineering from Beijing Institute of Technology under the supervision of Prof. Xiaoyu Li in 2020. Currently, he works as a postdoctoral fellow in the same group. His research is focused on the precise self-assembly of liquid crystalline block copolymers. Yiqi Chen has been a MS student in Materials and Chemical Engineering at Beijing Institute of Technology under the supervision of Prof. Xiaoyu Li since 2021. Her research interest is precise self-assembly of liquid crystalline block copolymers. Yunjun Luo has been a professor in the school of Material Science and Engineering at Beijing Institute of Technology since 1999, and the director of the Key Laboratory of High Energy Density Materials of the Ministry of Education. His research interests are energetic materials and polymer materials. Xiaoyu Li has been a professor in the school of Material Science and Engineering at Beijing Institute of Technology since 2017. His current research interests mainly include the precise assembly of crystalline/liquid crystalline block copolymers and supramolecular motifs, and synthesis and applications of novel energetic polymers.Contents 1. Introduction 94 2. Extension of Precise Self-Assembly Methodology 95 2.1. "Seeded-Growth" method 95 2.2. "Self-Seeding" method 97 2.3. "In-Situ Nucleation-Growth" method 98 2.4. Comparison of the three different growth modes 99 3. Precise Controllable Self-Assembly of 2D Structures 99 3.1. Crystalline BCP systems 99 3.2. Liquid crystalline BCP systems 101 3.3. Other systems 101 4. Multilevel Self-Assembled Structures 102 4.1. Multilevel self-assembly via non-covalent interactions 102 4.2. Multilevel self-assembly at interfaces 103 5. Application of Functionalized Precise Self-assembled Structures 104 6. Conclusions and Perspectives 105 © 2022 SIOC, CAS, Shanghai, & WILEY-VCH GmbH www.cjc.wiley-vch.de 95

In situ Nucleation‐Growth Strategy for Controllable Heterogeneous Supramolecular Polymerization of Liquid Crystalline Block Copolymers and Their Hierarchical Assembly

“…Such heterogeneous nanostructures, besides fundamental interests, could also be further applied as information storage barcodes, gene delivery vehicles, and catalytic devices, because they could integrate different moieties and thus multiple functions into one single assembly [30] . One of the typical demonstrations for such heterogeneous nanostructures would be their hierarchical assembly to produce high‐level assemblies via amphiphilic, electrostatic, hydrogen‐bonding, metal‐ligand chelation, or guest‐host interactions [31] …”

In situ Nucleation‐Growth Strategy for Controllable Heterogeneous Supramolecular Polymerization of Liquid Crystalline Block Copolymers and Their Hierarchical Assembly

“…[30] One of the typical demonstrations for such heterogeneous nanostructures would be their hierarchical assembly to produce high-level assemblies via amphiphilic, electrostatic, hydrogen-bonding, metal-ligand chelation, or guest-host interactions. [31] Therefore, we also explored the possibility of these heterogeneous SPs undergoing hierarchical assembly via simple amphiphilic interactions. For demonstration, the (P2VP-PFMA)-block-(PtBA-PFMA)-block-(P2VP-PFMA) triblock SPs were dialyzed against water, which was a selective solvent for P2VP.…”

Enwrapping graphdiyne (g-CnH2n−2) on hollow NiCo2O4 nanocages derived from a Prussian blue analogue as a p–n heterojunction for highly efficient photocatalytic hydrogen evolution

“…This indicates that NiCo 2 O 4 , GDY and (50) NiCo 2 O 4 @GDY catalysts all possess a strong light absorption capacity, which is connected to the fact that the catalysts are all black. 42,43 Among them, NiCo 2 O 4 possesses the highest adsorption intensity, which is due to the unique nanocage structure of NiCo 2 O 4 that allows light to be refracted and scattered several times within the cavity, effectively increasing the light absorption capacity. The energy band gap (E g ) of GDY and NiCo 2 O 4 can be estimated from the Tauc plot: (ahn) = A(hn − E g ) n/2, where a, n, A, E g and n are the absorption coefficient, optical frequency, constant, band gap and dependent on the transition type of catalysts, respectively.…”