Ghaffarkhah Ahmadreza, Hashemi Seyyed Alireza, Ahmadijokani Farhad, Goodarzi Milad, Riazi Hossein, Mhatre Sameer E, Zaremba Orysia, Rojas Orlando J, Soroush Masoud, Russell Thomas P, Wuttke Stefan, Kamkar Milad, Arjmand Mohammad
Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada.
Bioproducts Institute, Department of Chemical & Biological Engineering, Department of Chemistry and Department of Wood Science, The University of British Columbia, 2360 East Mall, Vancouver, BC, V6T 1Z3, Canada.
Nat Commun. 2023 Nov 28;14(1):7811. doi: 10.1038/s41467-023-43319-7.
Janus structures have unique properties due to their distinct functionalities on opposing faces, but have yet to be realized with flowing liquids. We demonstrate such Janus liquids with a customizable distribution of nanoparticles (NPs) throughout their structures by joining two aqueous streams of NP dispersions in an apolar liquid. Using this anisotropic integration platform, different magnetic, conductive, or non-responsive NPs can be spatially confined to opposite sides of the original interface using magnetic graphene oxide (mGO)/GO, TiCT/GO, or GO suspensions. The resultant Janus liquids can be used as templates for versatile, responsive, and mechanically robust aerogels suitable for piezoresistive sensing, human motion monitoring, and electromagnetic interference (EMI) shielding with a tuned absorption mechanism. The EMI shields outperform their current counterparts in terms of wave absorption, i.e., SE ≈ 51 dB, SE ≈ 0.4 dB, and A = 0.91, due to their high porosity ranging from micro- to macro-scales along with non-interfering magnetic and conductive networks imparted by the Janus architecture.
Janus结构因其相对面上独特的功能而具有独特的性质，但尚未在流动液体中实现。我们通过在非极性液体中合并两股纳米颗粒（NP）分散体的水流，展示了在整个结构中具有可定制纳米颗粒分布的此类Janus液体。使用这种各向异性集成平台，不同的磁性、导电或无响应纳米颗粒可以利用磁性氧化石墨烯（mGO）/氧化石墨烯、TiCT/氧化石墨烯或氧化石墨烯悬浮液在空间上限制在原始界面的相对两侧。所得的Janus液体可用作多功能、响应性和机械坚固的气凝胶的模板，适用于压阻传感、人体运动监测以及具有调谐吸收机制的电磁干扰（EMI）屏蔽。由于其从微观到宏观尺度的高孔隙率以及Janus结构赋予的互不干扰的磁性和导电网络，这些EMI屏蔽在波吸收方面优于目前的同类产品，即屏蔽效能（SE）≈51 dB、SE≈0.4 dB和吸收率（A）=0.91。
