Jekal Suk, Choi Hyuntae, Otgonbayar Zambaga, Kim Jiwon, Ra Yoon-Ho, Lim Jeongin, Jeon Young Un, Kim Jeoung Han, Rho Jinsung, Song Seulki, Yoon Chang-Min
Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea.
Department of Polymer Science and Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212, Korea.
ACS Omega. 2025 Mar 27;10(13):13327-13338. doi: 10.1021/acsomega.4c11212. eCollection 2025 Apr 8.
Although perovskite-structured materials have primarily been widely employed in solar cell applications, limited studies have been conducted in the field of electrorheology (ER). In this study, various halide perovskite materials, including FAPbBr, FAPbI, MAPbBr, MAPbI, CsPbBr, and CsPbI were synthesized for the first time to evaluate their applicability in ER for the first time. Initially, the morphological and chemical properties of these materials were characterized to confirm the successful formation of the perovskite structures. In addition, the as-synthesized halide perovskite materials were dispersed in silicone oil (3.0 wt %) to evaluate their suitability as dispersants in ER fluids. Among these, the CsPbI-based ER fluid exhibited the optimal dielectric properties and the greatest dispersion stability of the various systems examined. In ER applications, the CsPbI-based ER fluid demonstrated the highest ER performance, achieving a shear stress of 99.4 Pa, owing to the synergistic effects of its intrinsic rod-like structure and dielectric properties, which promoted polarization. The aspect ratios of the CsPbI rods were further controlled by modifying the synthetic process, resulting in the generation of both shorter and longer rods. Notably, ER fluids based on CsPbI synthesized via a hydrothermal method yielded rod-like structures with a high aspect ratio of 20, leading to an enhanced ER activity of 128.0 Pa. These results highlight the potential of halide perovskite materials for use in ER applications.
尽管钙钛矿结构材料主要广泛应用于太阳能电池领域，但在电流变学（ER）领域的研究却很有限。在本研究中，首次合成了各种卤化物钙钛矿材料，包括FAPbBr、FAPbI、MAPbBr、MAPbI、CsPbBr和CsPbI，以首次评估它们在电流变学中的适用性。首先，对这些材料的形态和化学性质进行了表征，以确认钙钛矿结构的成功形成。此外，将合成的卤化物钙钛矿材料分散在硅油（3.0 wt%）中，以评估它们作为电流变液中分散剂的适用性。其中，基于CsPbI的电流变液在所有测试体系中表现出最佳的介电性能和最大的分散稳定性。在电流变学应用中，基于CsPbI的电流变液表现出最高的电流变性能，由于其固有的棒状结构和介电性能的协同作用促进了极化，实现了99.4 Pa的剪切应力。通过改变合成工艺进一步控制CsPbI棒的长径比，从而产生了更短和更长的棒。值得注意的是，通过水热法合成的基于CsPbI的电流变液产生了高长径比为20的棒状结构，导致电流变活性增强至128.0 Pa。这些结果突出了卤化物钙钛矿材料在电流变学应用中的潜力。
