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Bioproduced Polymers Self-Assemble with Graphene Oxide into Nanocomposite Films with Enhanced Mechanical Performance
ACS Nano ( IF 15.8 ) Pub Date : 2020-11-04 , DOI: 10.1021/acsnano.0c00913 Kuang Liang 1, 2 , Ewa M. Spiesz 1 , Dominik T. Schmieden 1 , An-Wu Xu 2 , Anne S. Meyer 3 , Marie-Eve Aubin-Tam 1
ACS Nano ( IF 15.8 ) Pub Date : 2020-11-04 , DOI: 10.1021/acsnano.0c00913 Kuang Liang 1, 2 , Ewa M. Spiesz 1 , Dominik T. Schmieden 1 , An-Wu Xu 2 , Anne S. Meyer 3 , Marie-Eve Aubin-Tam 1
Affiliation
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Graphene oxide (GO) has recently been highlighted as a promising multipurpose two-dimensional material. However, free-standing graphene oxide films suffer from poor strength and flexibility, which limits scaling-up of production and lifetime structural robustness in applications. Inspired by the relationship between the organic and inorganic components of the hierarchical structure of nacre found in mollusk shells, we have fabricated self-assembled, layered graphene-based composite films. The organic phase of our composite is produced via environmentally friendly and economical methods based on bacterial production of γ-poly(glutamic acid) (PGA). Composite films made of GO, PGA, and divalent cations (Ca2+) were prepared through a slow solvent evaporation method at ambient temperature, resulting in a nacre-like layered structure. These biobased nanocomposite films showed impressive mechanical properties, which resulted from a synergistic combination of hydrogen bonding with the bacterially produced PGA and ionic bonding with calcium ions (Ca2+). The GO/PGA/Ca2+ composite films possessed a high strength of 150 ± 51.9 MPa and a high Young’s modulus of 21.4 ± 8.7 GPa, which represents an increase of 120% and over 70% with respect to pure GO films. We provide rational design strategies for the production of graphene-based films with improved mechanical performance, which can be applied in filtration purification of wastewater in the paper, food, beverage, pigment, and pharmaceuticals industries, as well as for manufacturing of functional membranes and surface coatings.
中文翻译：
生物生产的聚合物与氧化石墨烯自组装成具有增强的机械性能的纳米复合薄膜
氧化石墨烯（GO）最近被强调为一种有前途的多功能二维材料。但是，自支撑氧化石墨烯薄膜的强度和柔韧性很差，这限制了生产规模，并限制了应用的使用寿命。受软体动物壳中珍珠层分层结构中有机和无机成分之间关系的启发，我们制作了自组装，分层的石墨烯基复合膜。我们的复合材料的有机相是通过基于细菌的γ-聚谷氨酸（PGA）产生的环保，经济的方法生产的。由GO，PGA和二价阳离子（Ca 2+通过在环境温度下通过缓慢溶剂蒸发法制备α-β-环糊精，得到珍珠层状的层状结构。这些生物基纳米复合材料薄膜具有令人印象深刻的机械性能，这是由细菌产生的PGA的氢键与钙离子（Ca 2+）的离子键的协同作用共同产生的。GO / PGA / Ca 2+复合膜具有150±51.9 MPa的高强度和21.4±8.7 GPa的高杨氏模量，与纯GO膜相比，增加了120％，超过70％。我们为生产具有改善的机械性能的石墨烯基薄膜提供合理的设计策略，可将其应用于造纸，食品，饮料，颜料和制药行业中废水的过滤纯化，以及功能性膜和表面涂层。
更新日期：2020-11-25
中文翻译：
生物生产的聚合物与氧化石墨烯自组装成具有增强的机械性能的纳米复合薄膜
氧化石墨烯（GO）最近被强调为一种有前途的多功能二维材料。但是，自支撑氧化石墨烯薄膜的强度和柔韧性很差，这限制了生产规模，并限制了应用的使用寿命。受软体动物壳中珍珠层分层结构中有机和无机成分之间关系的启发，我们制作了自组装，分层的石墨烯基复合膜。我们的复合材料的有机相是通过基于细菌的γ-聚谷氨酸（PGA）产生的环保，经济的方法生产的。由GO，PGA和二价阳离子（Ca 2+通过在环境温度下通过缓慢溶剂蒸发法制备α-β-环糊精，得到珍珠层状的层状结构。这些生物基纳米复合材料薄膜具有令人印象深刻的机械性能，这是由细菌产生的PGA的氢键与钙离子（Ca 2+）的离子键的协同作用共同产生的。GO / PGA / Ca 2+复合膜具有150±51.9 MPa的高强度和21.4±8.7 GPa的高杨氏模量，与纯GO膜相比，增加了120％，超过70％。我们为生产具有改善的机械性能的石墨烯基薄膜提供合理的设计策略，可将其应用于造纸，食品，饮料，颜料和制药行业中废水的过滤纯化，以及功能性膜和表面涂层。
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