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Hierarchically Structured Fe3O4 Nanoparticles for High-Performance Magnetorheological Fluids with Long-Term Stability
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-11-09 , DOI: 10.1021/acsanm.0c02187 Junsok Choi 1 , Sangsok Han 1 , Ki Tae Nam 1 , Yongsok Seo 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-11-09 , DOI: 10.1021/acsanm.0c02187 Junsok Choi 1 , Sangsok Han 1 , Ki Tae Nam 1 , Yongsok Seo 1
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The magnetic Fe3O4 nanoparticles were produced by chemical precipitation from ferric chloride (FeCl3) and ferrous chloride (FeCl2) in an alkaline medium (ammonia hydroxide). The magnetic particle suspension was stabilized with citric acid. Hierarchically structured Fe3O4 (HS-Fe3O4) particles of submicrometer size were successfully produced from citric acid-capped Fe3O4 solution by using a simple electrospray (ES) process and applied for magnetorheolgical (MR) fluids. Submicrometer-sized spherical HS-Fe3O4 particles were formed by evaporation of the solvent and agglomeration of capped Fe3O4 particles during the ES process. With formation of hierarchically structured particles, the density of HS-Fe3O4 particles (ρ = 3.32 g/cm3) was noticeably decreased from that of the capped Fe3O4 (ρ = 4.29 g/cm3) without use of light materials, while the saturation magnetization was comparable to primary capped Fe3O4 (Ms = 73 emu/g). The MR fluid based on the submicrometer HS-Fe3O4 particles showed better MR performance with a large static yield stress (337 Pa), which was 300% greater than that of the hollow polymer/Fe3O4 suspension. Reduced density mismatch between the particles and the silicon oil medium significantly improved the stability of the HS-Fe3O4 suspension compared to the pure Fe3O4 suspension. The high MR performance and the improved sedimentation stability showed a possibility of the practical application of the submicrometer HS-Fe3O4 particle suspensions to microfluidic devices.
中文翻译：
具有长期稳定性的高性能磁流变流体的分层结构Fe 3 O 4纳米颗粒
磁性Fe 3 O 4纳米颗粒是通过在碱性介质（氢氧化氨）中从氯化铁（FeCl 3）和氯化亚铁（FeCl 2）中化学沉淀而制得的。用柠檬酸稳定磁性颗粒悬浮液。通过使用简单的电喷雾（ES）工艺，从柠檬酸封端的Fe 3 O 4溶液中成功制备了亚微米级的分层结构的Fe 3 O 4（HS-Fe 3 O 4）颗粒，并将其应用于磁溶（MR）流体。亚微米级球形HS-Fe 3 O 4在ES过程中，溶剂的蒸发和封端的Fe 3 O 4颗粒的团聚形成颗粒。与形成分层结构的颗粒，HS-Fe的密度的3个ö 4颗粒（ρ=3.32克/厘米3）是从该封端的明显减少的Fe 3 ö 4（ρ= 4.29Hz克/厘米3），而不使用轻的材料，而饱和磁化强度可与初级封端的Fe 3 O 4（M s = 73 emu / g）相比。基于亚微米级HS-Fe 3 O 4的MR流体颗粒在较大的静态屈服应力（337 Pa）下表现出更好的MR性能，比空心聚合物/ Fe 3 O 4悬浮液大300％。与纯Fe 3 O 4悬浮液相比，减小的颗粒与硅油介质之间的密度失配显着提高了HS-Fe 3 O 4悬浮液的稳定性。较高的MR性能和改善的沉降稳定性表明，亚微米级HS-Fe 3 O 4颗粒悬浮液可以实际应用于微流体装置。
更新日期：2020-11-25
中文翻译：
具有长期稳定性的高性能磁流变流体的分层结构Fe 3 O 4纳米颗粒
磁性Fe 3 O 4纳米颗粒是通过在碱性介质（氢氧化氨）中从氯化铁（FeCl 3）和氯化亚铁（FeCl 2）中化学沉淀而制得的。用柠檬酸稳定磁性颗粒悬浮液。通过使用简单的电喷雾（ES）工艺，从柠檬酸封端的Fe 3 O 4溶液中成功制备了亚微米级的分层结构的Fe 3 O 4（HS-Fe 3 O 4）颗粒，并将其应用于磁溶（MR）流体。亚微米级球形HS-Fe 3 O 4在ES过程中，溶剂的蒸发和封端的Fe 3 O 4颗粒的团聚形成颗粒。与形成分层结构的颗粒，HS-Fe的密度的3个ö 4颗粒（ρ=3.32克/厘米3）是从该封端的明显减少的Fe 3 ö 4（ρ= 4.29Hz克/厘米3），而不使用轻的材料，而饱和磁化强度可与初级封端的Fe 3 O 4（M s = 73 emu / g）相比。基于亚微米级HS-Fe 3 O 4的MR流体颗粒在较大的静态屈服应力（337 Pa）下表现出更好的MR性能，比空心聚合物/ Fe 3 O 4悬浮液大300％。与纯Fe 3 O 4悬浮液相比，减小的颗粒与硅油介质之间的密度失配显着提高了HS-Fe 3 O 4悬浮液的稳定性。较高的MR性能和改善的沉降稳定性表明，亚微米级HS-Fe 3 O 4颗粒悬浮液可以实际应用于微流体装置。
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