Self-assembly of magnetic colloids under unsteady fields

IF 7 2区化学 Q1 CHEMISTRY, PHYSICAL

Current Opinion in Colloid & Interface Science Pub Date : 2025-01-30 DOI:10.1016/j.cocis.2025.101903

G. Camacho, J.R. Morillas, J. de Vicente

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Abstract

The use of magnetic fields offers an external, versatile way of controlling self-assembly of colloids. This review provides an exhaustive overview of unsteady fields that can vary in one, two, or three dimensions of space, as a powerful tool to direct the self-assembly of magnetic colloids into structures with tunable properties. Unlike steady fields, unsteady (nonstationary) fields can overcome the limitations of classical dipolar interactions, leading to a much wider range of structures, ranging from dense crystalline aggregates to 3D spanning networks, or dynamic clusters. The ability to precisely control the amplitude, frequency, and field direction allows for fine-tuning the interplay of interparticle forces, resulting in controllable assembly pathways. This review analyzes how different types of unsteady fields influence the morphology and dynamics of the self-assembled structures. Key parameters, such as the Mason number, are discussed to characterize the governing driving forces, and potential applications are highlighted.

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非定常磁场下磁性胶体的自组装

磁场的使用提供了一种外部的、通用的方法来控制胶体的自组装。这篇综述提供了一个详尽的非定常场的概述，可以在一个，两个，或三维空间变化，作为一个强大的工具来指导磁性胶体的自组装成具有可调性质的结构。与稳定场不同，非定常（非定常）场可以克服经典偶极相互作用的局限性，从而产生更广泛的结构，从密集的晶体聚集体到3D跨越网络或动态簇。精确控制振幅、频率和场方向的能力允许微调粒子间力的相互作用，从而实现可控的组装路径。本文分析了不同类型的非定常场对自组装结构形态和动力学的影响。讨论了关键参数，如梅森数，以表征控制驱动力，并强调了潜在的应用。

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来源期刊

Current Opinion in Colloid & Interface Science 化学-物理化学

CiteScore

16.50

自引率

1.10%

发文量

审稿时长

11.3 weeks

期刊介绍： Current Opinion in Colloid and Interface Science (COCIS) is an international journal that focuses on the molecular and nanoscopic aspects of colloidal systems and interfaces in various scientific and technological fields. These include materials science, biologically-relevant systems, energy and environmental technologies, and industrial applications. Unlike primary journals, COCIS primarily serves as a guide for researchers, helping them navigate through the vast landscape of recently published literature. It critically analyzes the state of the art, identifies bottlenecks and unsolved issues, and proposes future developments. Moreover, COCIS emphasizes certain areas and papers that are considered particularly interesting and significant by the Editors and Section Editors. Its goal is to provide valuable insights and updates to the research community in these specialized areas.