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热致向列型液晶中的铁磁流体微滴链

Ferrofluid Droplet Chains in Thermotropic Nematic Liquid Crystals.

作者信息

Chandrasekar Varun, Lu Jian Ren, Dierking Ingo

机构信息

Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M139PL, UK.

出版信息

Chemphyschem. 2025 Feb 1;26(3):e202400858. doi: 10.1002/cphc.202400858. Epub 2024 Nov 20.

DOI:10.1002/cphc.202400858
PMID:39489702
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11793259/
Abstract

Dispersing ferrofluids in liquid crystals (LCs) produces unique systems which possess magnetic functionality and novel phenomena such as droplet chaining. This work reports the formation of ferrofluid droplet chains facilitated by the topological defects within the LC director field, induced by the dispersed ferrofluid. The translational and rotational motion of these chains could be controlled via application of external magnetic fields. The process of the droplet chain formation in LCs can be stabilized by the addition of surfactants. The magnetic colloidal particles in the ferrofluid located at the interface between the ferrofluid and the LC are arranged so that a boundary layer was formed. The velocities and boundary layer thickness values of ferrofluid droplet chains in nematic 5CB (4-Cyano-4'-pentylbiphenyl) were investigated for varying average droplet sizes and number of droplets in a chain. The creation and behaviour of ferrofluid droplet chains in 5CB with the addition of the surfactant polysorbate 60 (Tween-60) and without, was comparatively investigated. The integration of liquid crystals and ferrofluids along with the incorporation of functional materials facilitates the innovative development of advanced materials for future applications.

摘要

将铁磁流体分散在液晶（LCs）中会产生具有独特磁性功能和诸如液滴链等新现象的独特体系。这项工作报道了由分散的铁磁流体在液晶指向矢场中诱导的拓扑缺陷促进铁磁流体液滴链的形成。这些链的平移和旋转运动可通过施加外部磁场来控制。通过添加表面活性剂可以稳定液晶中液滴链的形成过程。位于铁磁流体与液晶界面处的铁磁流体中的磁性胶体颗粒排列成形成了一个边界层。针对向列型5CB（4-氰基-4'-戊基联苯）中铁磁流体液滴链在不同平均液滴尺寸和链中液滴数量的情况下，研究了其速度和边界层厚度值。比较研究了添加表面活性剂聚山梨醇酯60（吐温60）和未添加时5CB中铁磁流体液滴链的产生和行为。液晶与铁磁流体的结合以及功能材料的加入促进了未来应用的先进材料的创新发展。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/35183666e66e/CPHC-26-e202400858-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/63290c74f45c/CPHC-26-e202400858-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/e683055cbdaf/CPHC-26-e202400858-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/230f943d1049/CPHC-26-e202400858-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/158d071f1b8f/CPHC-26-e202400858-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/496995b6d29b/CPHC-26-e202400858-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/6486641071af/CPHC-26-e202400858-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/b762ddb60ec9/CPHC-26-e202400858-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/f71b5b3b1a79/CPHC-26-e202400858-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/0ea50388d058/CPHC-26-e202400858-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/12c408136e31/CPHC-26-e202400858-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/35183666e66e/CPHC-26-e202400858-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/63290c74f45c/CPHC-26-e202400858-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/e683055cbdaf/CPHC-26-e202400858-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/230f943d1049/CPHC-26-e202400858-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/158d071f1b8f/CPHC-26-e202400858-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/496995b6d29b/CPHC-26-e202400858-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/6486641071af/CPHC-26-e202400858-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/b762ddb60ec9/CPHC-26-e202400858-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/f71b5b3b1a79/CPHC-26-e202400858-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/0ea50388d058/CPHC-26-e202400858-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/12c408136e31/CPHC-26-e202400858-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1368/11793259/35183666e66e/CPHC-26-e202400858-g004.jpg

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