Molecular dynamics simulations of solvent-exfoliation and stabilization of graphene with the assistance of compressed carbon dioxide and pyrene–polyethylene glycol

Literature Information

Publication Date 2017-05-31
DOI 10.1039/C7CP01277B
Impact Factor 3.676
Authors

Xiaodan Xu, Lu Cai, Xiaoli Zheng, Qun Xu


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Abstract

In this work we carried out molecular dynamics (MD) simulations to explore the mechanism of solvent-exfoliation and stabilization of graphene in the presence of (compressed) carbon dioxide (cpCO2), p-xylene and pyrene–polyethylene glycol (Py–PEG) polymers. We studied the role of each component in graphene exfoliation and stabilization by setting different experimental variables. The simulation results show that the cpCO2 molecules played a “wedge” role in the exfoliation process, firstly wedging into the interlayer, and then helping solvent molecules to insert into the interlayer. The solvent molecules between the graphene sheets are the main reasons that graphene exfoliation is achieved. And the Py–PEG polymer chains mainly act as stabilizers to prevent the exfoliated graphene sheets from restacking. This work provides detailed theoretical clues to better understand the mechanism of exfoliation and stabilization of graphene.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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