Bio-inspired composite films with integrative properties based on the self-assembly of gellan gum–graphene oxide crosslinked nanohybrid building blocks
Bio-inspired composite films with integrative properties based on the self-assembly of gellan gum–graphene oxide crosslinked nanohybrid building blocks
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DOI：
10.1016/j.carbon.2015.05.021
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发表时间：
2015-09
期刊：
影响因子：
10.9
通讯作者：
Ding-kun Kang;Zhixiang Cai;Qiangwei Jin;Hongbin Zhang
中科院分区：
文献类型：
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作者：
Ding-kun Kang;Zhixiang Cai;Qiangwei Jin;Hongbin Zhang
模仿自然结构合成新型结构材料引起了广泛关注，但实际应用进展仍然缓慢。天然复合材料通过有机和无机层的“实体”排列以及各种增韧机制实现了强度和韧性之间的出色平衡。我们通过结合氧化石墨烯 (GO) 和结冷胶 (GG) 生物聚合物来模拟天然珍珠质的结构特征。我们还揭示了综合力学性能的机制。几种带有 GG 涂层和交联的 GO 纳米片被用作具有内在硬/软特性的最佳构建块。这些材料通过真空过滤诱导快速自组装成排列整齐的珍珠质状薄膜，产生坚韧的仿生复合薄膜，其断裂强度为88.7MPa，断裂染色率为0.84%，拉伸模量为25.4GPa，具有良好的生物相容性。这项研究的优点是不受限制地制造交联的 GO 纳米杂化构件的均匀胶体悬浮液。使用这些构件构建的复合薄膜具有创新性，因为其成分之间存在组合相互作用，包括配位键、离子键和氢键。这些薄膜与其他报道的具有单粘附相互作用的仿生GO复合薄膜不同，因此通过多重能量耗散机制提供良好的综合机械性能。
Mimicking natural structures to synthesize novel structural materials is attracting considerable attention, but progress in practical applications remains slow. Natural composites achieve excellent balance between strength and toughness from the “brick-and-mortar” arrangement of organic and inorganic layers, accompanied with various toughening mechanisms. We emulate the structural features of natural nacre by combining graphene oxide (GO) and a gellan gum (GG) biopolymer. We also reveal the mechanism of integrative mechanical performance. Several GO nanosheets with GG coating and crosslinking are used as optimal building blocks with intrinsic hard/soft features. These materials are induced to rapidly self-assemble into aligned nacre-like films by vacuum filtration to produce strong and tough bio-inspired composite films with fracture strength of 88.7 MPa, fracture stain of 0.84%, tensile modulus of 25.4 GPa and good biocompatibility. This study has merit of unrestricted fabrication of a homogeneous colloidal suspension of crosslinked nanohybrid building blocks of GO. Composite films constructed using these building blocks are innovative because of combined interactions, including coordination bonding, ionic bonding, and hydrogen bonding among their constituents. These films differ from other reported bio-inspired GO composite films with single adhesion interaction and thus provide good integrative mechanical performance through a multiple energy dissipation mechanism.