Effect of graphene bending in dynamic compounding process on the thermal conductivity of graphene and its composites. (March 2022)

• Record Type: Journal Article
• Authors: Sun, Yingying; Zhou, Luyao; Han, Yu; Cui, Liu
• Is Part Of: Materials & design. Volume 215(2022)
• Publication Date: 2022-03
• Subjects: Graphene -- Composites -- Molecular dynamics -- Finite element analysis -- Multi-scale simulation; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2022.110498
• Languages: English
• ISSNs: 0264-1275

Abstract

Graphical abstract: Highlights: Bending mechanism of graphene and its influence was elucidated using multi-scale simulation. Dynamic bending process of graphene was divided into internal and external parts. Effect of bending content on thermal conductivity of bent graphene and its composites was analyzed. Long and low bends in graphene improve thermal conductivity of graphene filled composites. Abstract: Revealing the bending mechanism of graphene nanosheets (GNSs) is crucial in improving the thermal properties of GNSs and their derivatives. For the effective application of graphene-based composites, the effect of bending on the thermal conductivity must be investigated. Consequently, the bending mechanism of GNSs in the dynamic compounding process was studied using molecular dynamics (MD). According to the MD simulation and previous experimental study, finite element models of bent GNSs and GNSs/epoxy composites were designed, to study the influence of bending content on thermal conductivity. The investigations indicate that the thermal conductivity of bent GNSs along the X-axis ( KGNS, x ) decreases linearly with the increase in height and number of bends. With the increase in bending length, KGNS, x initially decreases and then increases when the bend is low, while it always decreases when the bend is high. The thermal conductivity of bent GNSs/epoxy composites along the X-axis ( Kc, x ) follows a similar trend and reduces sharply with increasing height. Contrastingly, Kc, x always increases with the increasing length of bends. The results show that long and low bends in graphene improve thermal conductivity of graphene filled composites.