Tunable order in colloids of hard magnetic hexaferrite nanoplatelets
作者机构：Faculty of ChemistryMoscow State UniversityLeninskie Gory lb3Moscow 119991Russia Department of Materials ScienceMSU-BIT UniversityShenzhen 517182China Faculty of Materials ScienceMoscow State UniversityLeninskie Gory lb73Moscow 119991Russia European Synchrotron Radiation FacilityAvenue des Martyrs 71Grenoble 38043France School of Natural Sciences and MathematicsUral Federal UniversityLenin Ave 51Ekaterinburg 620000Russia
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2022年第15卷第2期
页 面：898-906页
核心收录：
学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：supported by the Russian Science Foundation(RSF)(No.20-73-10129) AnAE acknowledge RFBR(No.18-29-19105) support in part of SAXS characterization technique development for stacked layered structures
主 题：hexaferrite ferrofluid self-assembly colloidal solution
摘 要：Structural ordering in the concentrated magnetic colloids containing 50×5 nm hard magnetic disc-like SrFe_(12)O_(19) nanoparticles was investigated by cryogenic scanning electron microscopy,optical microscopy,magnetic measurements,and small-angle X-ray *** was revealed that macroscopically homogeneous magnetic liquid consists of dynamic threads of stacked *** threads align into quasiperiodic arrays with the distances between individual threads of a few *** also can form pseudodomain structures with -90°domain boundaries realized through T-type thread *** effects of magnetic attraction and electrostatic repulsion on the equilibrium interplatelet distance in the threads were *** was demonstrated that this distance can be tuned by the control of the particles charge and electric double layer screening from Stern layer thickness(-1 nm)to tens of *** was shown that the permanent magnetic field is not able to cause any structural changes in the ordered magnetic liquid phase,while alternating field draws particles apart by their *** variation of interparticle distance up to 6%was achieved using an alternating magnetic field of low *** data were complemented by the theoretical models of screened electrostatic interactions between spherical and platelike magnetic *** last model provides good predictive power and correlates with the experimental *** stabilization energy of the condensed phase in the order of 1-10 kBT was derived from the *** approach allows controlling of an equilibrium interparticle distance and interparticle distance distribution by adjusting the magnetization and surface charge of the particles as well as the ionic strength of the solvent.
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