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Anisotropic and Lightweight Carbon/Graphene Composite Aerogels for Efficient Thermal Insulation and Electromagnetic Interference Shielding
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-27 , DOI: 10.1021/acsami.2c13000 Xinyue Jiang 1 , Zhixi Zhao 1 , Shengtai Zhou 1 , Huawei Zou 1 , Pengbo Liu 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-27 , DOI: 10.1021/acsami.2c13000 Xinyue Jiang 1 , Zhixi Zhao 1 , Shengtai Zhou 1 , Huawei Zou 1 , Pengbo Liu 1
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High-performance and lightweight carbon aerogels (CAs) have attracted considerable attention in various fields such as electrochemistry, catalysis, adsorption, energy storage, and so on. However, finding an environmentally friendly and efficient preparation method and achieving a controllable performance of CAs are still a challenge. Herein, a series of anisotropic carbon/graphene composite aerogels were synthesized by unidirectional freezing of polyamic acid ammonium salt/graphene oxide (PAS/GO) suspension followed by lyophilization, thermal imidization, and carbonization. The prepared aerogels presented a tubular pore structure oriented along the freezing direction. The GO dispersed in the polymer matrix reinforced the skeleton of aerogels, which significantly inhibited the volume shrinkage during the preparation process, thus giving low densities of 0.074–0.185 g cm–3. In addition, the oriented pore structure endowed the composite aerogels with obviously anisotropic heat insulation performance. The radial thermal conductivity was as low as 0.038 W m–1 K–1 at the density of 0.074 g cm–3. When the initial content of GO rose to 20 phr, the resultant aerogels exhibited a high electrical conductivity of about 0.77 S cm–1 in the radial direction and the electromagnetic interference shielding effectiveness (EMI SE) reached 54.6 dB at the same time. Therefore, this study provided a facile and environmentally friendly method to prepare lightweight and anisotropic carbon aerogels.
中文翻译：
用于高效隔热和电磁干扰屏蔽的各向异性和轻质碳/石墨烯复合气凝胶
高性能、轻质的碳气凝胶（CAs）在电化学、催化、吸附、储能等各个领域引起了广泛关注。然而，寻找一种环境友好且高效的制备方法并实现 CAs 的可控性能仍然是一个挑战。在此，通过单向冷冻聚酰胺酸铵盐/氧化石墨烯（PAS/GO）悬浮液，然后进行冻干、热亚胺化和碳化，合成了一系列各向异性碳/石墨烯复合气凝胶。制备的气凝胶呈现出沿冷冻方向取向的管状孔结构。分散在聚合物基质中的GO增强了气凝胶的骨架，显着抑制了制备过程中的体积收缩，–3。此外，定向孔结构赋予复合气凝胶明显的各向异性隔热性能。径向热导率低至 0.038 W m –1 K –1，密度为 0.074 g cm –3。当 GO 的初始含量升至 20 phr 时，所得气凝胶在径向表现出约 0.77 S cm -1的高电导率，同时电磁干扰屏蔽效率 (EMI SE) 达到 54.6 dB。因此，本研究为制备轻质、各向异性的碳气凝胶提供了一种简便、环保的方法。
更新日期：2022-09-27
中文翻译：
用于高效隔热和电磁干扰屏蔽的各向异性和轻质碳/石墨烯复合气凝胶
高性能、轻质的碳气凝胶（CAs）在电化学、催化、吸附、储能等各个领域引起了广泛关注。然而，寻找一种环境友好且高效的制备方法并实现 CAs 的可控性能仍然是一个挑战。在此，通过单向冷冻聚酰胺酸铵盐/氧化石墨烯（PAS/GO）悬浮液，然后进行冻干、热亚胺化和碳化，合成了一系列各向异性碳/石墨烯复合气凝胶。制备的气凝胶呈现出沿冷冻方向取向的管状孔结构。分散在聚合物基质中的GO增强了气凝胶的骨架，显着抑制了制备过程中的体积收缩，–3。此外，定向孔结构赋予复合气凝胶明显的各向异性隔热性能。径向热导率低至 0.038 W m –1 K –1，密度为 0.074 g cm –3。当 GO 的初始含量升至 20 phr 时，所得气凝胶在径向表现出约 0.77 S cm -1的高电导率，同时电磁干扰屏蔽效率 (EMI SE) 达到 54.6 dB。因此，本研究为制备轻质、各向异性的碳气凝胶提供了一种简便、环保的方法。
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