Magnetochromic Elastomer With Instant Color Changes: A Study of the Influence of Material Composition

IF 4.2 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Chonghui Li, Frederikke Bahrt Madsen, Lifei Liu, Liyun Yu, Weizhen Zhao, Anne Ladegaard Skov
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Abstract

Magnetochromic materials change color upon variation in an external magnetic field. A magnetochromic elastomer resulting from the dispersion of magnetic nanoparticles (MNPs) in a liquid and subsequent emulsification in a crosslinkable polydimethylsiloxane (PDMS) is presented. The MNPs form rod-like structures under an external magnetic field, aligning with the field and allowing light to pass through the elastomer. The elastomer thus changes from dark grey to transparent/light grey. Polyethylene glycol 200 (PEG200) is selected as carrier liquid due to the faster movement of MNPs herein than in glycerol, leading to more rapid color changes in the films. The influence of magnetic particle types (commercial, superparamagnetic, and surfactant-coated) on the magnetochromic effects is investigated. All films exhibit optical density changes upon exposure to a magnetic field. Moreover, the films retain their color-changing ability after cycles of 40 times exposure to a magnetic field. Compared to the synthesized superparamagnetic particles, the films with commercial particles display superior optical density change abilities, suggesting commercial MNPs are more suitable for magnetochromic films. The obtained films have promising applications as magnetical field sensors due to their simple storage requirements, rapid response, and excellent repeatability.

Abstract Image

Abstract Image

瞬间变色的磁致变色弹性体:材料成分的影响研究
磁致变色材料会随着外部磁场的变化而改变颜色。本文介绍了一种磁致变色弹性体,它是将磁性纳米粒子(MNPs)分散在液体中,然后在可交联的聚二甲基硅氧烷(PDMS)中乳化而成。在外部磁场作用下,磁性纳米粒子形成杆状结构,与磁场对齐,使光线穿过弹性体。弹性体因此从深灰色变为透明/浅灰色。之所以选择聚乙二醇 200 (PEG200) 作为载液,是因为与甘油相比,这里的磁性颗粒移动速度更快,从而使薄膜的颜色变化更迅速。研究了磁性颗粒类型(商用、超顺磁性和表面活性剂涂层)对磁致变色效果的影响。所有薄膜在暴露于磁场时都会出现光密度变化。此外,这些薄膜在磁场中暴露 40 次后仍能保持其变色能力。与合成的超顺磁性粒子相比,含有商用粒子的薄膜显示出更优越的光密度变化能力,这表明商用 MNPs 更适合用于磁致变色薄膜。所获得的薄膜具有简单的存储要求、快速的响应和出色的重复性,因此作为磁场传感器具有广阔的应用前景。
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来源期刊
Macromolecular Materials and Engineering
Macromolecular Materials and Engineering 工程技术-材料科学:综合
CiteScore
7.30
自引率
5.10%
发文量
328
审稿时长
1.6 months
期刊介绍: Macromolecular Materials and Engineering is the high-quality polymer science journal dedicated to the design, modification, characterization, processing and application of advanced polymeric materials, including membranes, sensors, sustainability, composites, fibers, foams, 3D printing, actuators as well as energy and electronic applications. Macromolecular Materials and Engineering is among the top journals publishing original research in polymer science. The journal presents strictly peer-reviewed Research Articles, Reviews, Perspectives and Comments. ISSN: 1438-7492 (print). 1439-2054 (online). Readership:Polymer scientists, chemists, physicists, materials scientists, engineers Abstracting and Indexing Information: CAS: Chemical Abstracts Service (ACS) CCR Database (Clarivate Analytics) Chemical Abstracts Service/SciFinder (ACS) Chemistry Server Reaction Center (Clarivate Analytics) ChemWeb (ChemIndustry.com) Chimica Database (Elsevier) COMPENDEX (Elsevier) Current Contents: Physical, Chemical & Earth Sciences (Clarivate Analytics) Directory of Open Access Journals (DOAJ) INSPEC (IET) Journal Citation Reports/Science Edition (Clarivate Analytics) Materials Science & Engineering Database (ProQuest) PASCAL Database (INIST/CNRS) Polymer Library (iSmithers RAPRA) Reaction Citation Index (Clarivate Analytics) Science Citation Index (Clarivate Analytics) Science Citation Index Expanded (Clarivate Analytics) SciTech Premium Collection (ProQuest) SCOPUS (Elsevier) Technology Collection (ProQuest) Web of Science (Clarivate Analytics)
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