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Preparation method of flexible graphene composite aerogel
The invention discloses a method for preparing flexible graphene composite aerogel based on gas template assisted molding and high-temperature thermal reduction. The preparation method comprises the following steps: 1) preparing silicon dioxide fiber dispersion liquid; 2) preparing a graphene oxide aqueous solution; 3) preparing a mixed solution; (4) carrying out gas template assisted molding; (5) preparing aerogel; and (6) high-temperature treatment. According to the method, silicon dioxide fibers are introduced into graphene aerogel to improve the overall performance. The process is characterized in that the problem that silicon dioxide fibers are difficult to disperse in an aqueous solution is solved through physical and chemical modification modes, a three-dimensional flexible network structure is constructed through assistance of a gas template, and the problem that application is limited due to poor flexibility of graphene aerogel is solved. The aerogel has a hierarchical network structure, and a part of silicon dioxide fibers are distributed among graphene nanosheet layers to form a polygonal hole wall; and the other part of fibers are positioned on the polygonal hole walls and play a role in supporting the porous structure. The stable porous structure can be prepared through a simple process by means of gas template auxiliary forming, the technological process is simplified, the preparation time is shortened, and the efficiency is improved. More importantly, the composite aerogel prepared by the invention has excellent electromagnetic-infrared stealth performance, also has flexibility, high elasticity, heat insulation and ablation resistance, and is expected to be applied to various fields of electromagnetic stealth, heat insulation, sensors and the like.
本发明公开了一种基于气体模板辅助成型和高温热还原制备柔性石墨烯复合气凝胶的方法，所述制备方法步骤如下：1)制备二氧化硅纤维分散液；2)制备氧化石墨烯水溶液；3)制备混合液；4)气体模板辅助成型；5)制备气凝胶；6)高温处理。所述方法在石墨烯气凝胶中引入二氧化硅纤维来提高整体性能。本工艺的特点在于通过物理和化学改性的方式解决了二氧化硅纤维难分散于水溶液的问题，并通过气体模板辅助构筑三维柔性网络结构，解决了石墨烯气凝胶因为柔性差而限制应用的难题。该气凝胶具有分级网络结构，一部分二氧化硅纤维分布于石墨烯纳米片层之间形成了多边形孔壁；另一部分纤维位于多边形孔壁上，对多孔结构起到了支撑作用。本文提出的气体模板辅助成型可以通过简单的工艺制备得到稳定的多孔结构，不仅简化了工艺流程更缩短了制备时间，提高了效率。重要的是，本发明制备出的复合气凝胶具有优良的电磁‑红外隐身性能的同时也具备柔性、高弹性、隔热、耐烧蚀性能，有望在电磁隐身、隔热、传感器等各个领域得到应用。
Preparation method of flexible graphene composite aerogel
The invention discloses a method for preparing flexible graphene composite aerogel based on gas template assisted molding and high-temperature thermal reduction. The preparation method comprises the following steps: 1) preparing silicon dioxide fiber dispersion liquid; 2) preparing a graphene oxide aqueous solution; 3) preparing a mixed solution; (4) carrying out gas template assisted molding; (5) preparing aerogel; and (6) high-temperature treatment. According to the method, silicon dioxide fibers are introduced into graphene aerogel to improve the overall performance. The process is characterized in that the problem that silicon dioxide fibers are difficult to disperse in an aqueous solution is solved through physical and chemical modification modes, a three-dimensional flexible network structure is constructed through assistance of a gas template, and the problem that application is limited due to poor flexibility of graphene aerogel is solved. The aerogel has a hierarchical network structure, and a part of silicon dioxide fibers are distributed among graphene nanosheet layers to form a polygonal hole wall; and the other part of fibers are positioned on the polygonal hole walls and play a role in supporting the porous structure. The stable porous structure can be prepared through a simple process by means of gas template auxiliary forming, the technological process is simplified, the preparation time is shortened, and the efficiency is improved. More importantly, the composite aerogel prepared by the invention has excellent electromagnetic-infrared stealth performance, also has flexibility, high elasticity, heat insulation and ablation resistance, and is expected to be applied to various fields of electromagnetic stealth, heat insulation, sensors and the like.
本发明公开了一种基于气体模板辅助成型和高温热还原制备柔性石墨烯复合气凝胶的方法，所述制备方法步骤如下：1)制备二氧化硅纤维分散液；2)制备氧化石墨烯水溶液；3)制备混合液；4)气体模板辅助成型；5)制备气凝胶；6)高温处理。所述方法在石墨烯气凝胶中引入二氧化硅纤维来提高整体性能。本工艺的特点在于通过物理和化学改性的方式解决了二氧化硅纤维难分散于水溶液的问题，并通过气体模板辅助构筑三维柔性网络结构，解决了石墨烯气凝胶因为柔性差而限制应用的难题。该气凝胶具有分级网络结构，一部分二氧化硅纤维分布于石墨烯纳米片层之间形成了多边形孔壁；另一部分纤维位于多边形孔壁上，对多孔结构起到了支撑作用。本文提出的气体模板辅助成型可以通过简单的工艺制备得到稳定的多孔结构，不仅简化了工艺流程更缩短了制备时间，提高了效率。重要的是，本发明制备出的复合气凝胶具有优良的电磁‑红外隐身性能的同时也具备柔性、高弹性、隔热、耐烧蚀性能，有望在电磁隐身、隔热、传感器等各个领域得到应用。
Preparation method of flexible graphene composite aerogel
一种柔性石墨烯复合气凝胶的制备方法
CHENG YUANJING (author) / LI YIBIN (author)
2023-10-10
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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