Department of Chemistry, University of California, Riverside, CA 92521, USA.
Science. 2023 Jun 30;380(6652):1384-1390. doi: 10.1126/science.adg2657. Epub 2023 Jun 29.
Colloidal assembly into chiral superstructures is usually accomplished with templating or lithographic patterning methods that are only applicable to materials with specific compositions and morphologies over narrow size ranges. Here, chiral superstructures can be rapidly formed by magnetically assembling materials of any chemical compositions at all scales, from molecules to nano- and microstructures. We show that a quadrupole field chirality is generated by permanent magnets caused by consistent field rotation in space. Applying the chiral field to magnetic nanoparticles produces long-range chiral superstructures controlled by field strength at the samples and orientation of the magnets. Transferring the chirality to any achiral molecules is enabled by incorporating guest molecules such as metals, polymers, oxides, semiconductors, dyes, and fluorophores into the magnetic nanostructures.
胶态组装成手性超结构通常是通过模板或光刻图案化方法来完成的，这些方法仅适用于具有特定组成和形态的材料，且只能在狭窄的尺寸范围内使用。在这里，可以通过磁组装任何化学成分的材料在所有尺度上快速形成手性超结构，从分子到纳米和微结构。我们表明，通过在空间中一致地旋转磁场，由永磁体产生四极场手性。将手性场施加到磁性纳米粒子上会产生由样品上的场强和磁铁的取向控制的长程手性超结构。通过将客体分子（如金属、聚合物、氧化物、半导体、染料和荧光团）掺入磁性纳米结构中，可以将手性转移到任何非手性分子上。
