摘要
以细菌纳米纤维素(BC)为基材,石墨烯纳米片为导电组分,磁性四氧化三铁纳米粒子为导磁组分,通过抽滤法制备复合薄膜。通过对复合膜进行合理的层级结构设计和电、磁功能组分组成设计,提升薄膜的电磁屏蔽效能及力学性能,研究结果表明:电、磁功能组分的协同作用可以显著提升薄膜的屏蔽效果,当BC含量为总用量的20%,GNP∶Fe_(3)O_(4)=9∶1时,所得复合薄膜具有最佳电磁屏蔽效能(43.86d B),电导率达到576.25S/m,其屏蔽机制以吸收为主。此外,BC的加入使得复合薄膜层内与层间的结合更加紧密,从而获得优异的力学性能(0.19m m厚的复合薄膜拉伸强度为10.69MPa)和可折叠性能。相较于混合均匀的体系,梯度设计使复合膜的电磁屏蔽效能得到显著的提升。
In this paper,composite films were prepared by the suction filtration method,with bacterial nanocellulose(BC)as the substrate,Graphene nanoplatelets(GNP)as the conductive component,and magnetic ferric oxide nanoparticles(Fe_(3)O_(4))as the magnetic component.By designing a reasonable hierarchical structure and tuning the composition of electrical and magnetic functional components of the composite film,the electromagnetic shielding effectiveness and mechanical properties of the film can be significantly improved.Results showed that the synergistic effect of electrical and magnetic functional components can significantly improve the shielding effect of thin film.When the BC content is 20%and GNP:Fe_(3)O_(4)=9:1,the composite film achieved the best electromagnetic shielding efficiency(43.86 dB),and a conductivity of 576.25 S/m,with wave absorption mechanism dominating the shielding process.In addition,the addition of BC makes the bonding between the inter-and intra-layers of the composite film closer,resulting in excellent mechanical properties(tensile strength of 10.69 MPa for 0.19 mm thick composite films)and foldable properties.Compared with a uniformly mixed system,the gradient design significantly improves the electromagnetic shielding effectiveness of the composite film.
作者
程栋
Cheng Dong(Guangdong Guanhao New Material R&D Co.,Ltd.,Guangzhou,Guangdong 511466,China)
出处
《中华纸业》
2025年第5期73-80,共8页
China Pulp & Paper Industry
关键词
电磁屏蔽
薄膜
石墨烯纳米片
细菌纳米纤维素
纳米四氧化三铁
electromagnetic interference shielding
thin film
Graphene nanoplatelets
bacterial nanocellulose
nanoFe_(3)O_(4)
