Tunable magnetochromic elastomer with instantaneous color changes

Chonghui Li, Piotr Mazurek, Liyun Yu, Anne Ladegaard Skov

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

A controllable magnetochromic elastomer is developed by dissolving magnetic nanoparticles (MNPs) in poly(ethylene glycol)-200 (PEG-200) and emulsifying the solution in polydimethylsiloxane (PDMS) using a high-shear Speedmixer. The
MNPs are aligned in order along the direction of the externally applied magnetic field, causing the material to become transparent and realizing a switch on/off function. Both particle size and size distribution were observed to affect
magnetochromic response, and use of an ultrasonication bath was shown to prohibit MNP agglomerations. In addition, the surfactant surface-modified MNPs synthesized via co-precipitation were shown to possess both a smaller primary size and a narrower size distribution compared to non-treated commercial MNPs, leading to improved MNP dispersion stability in PEG-200. The optimized silicone elastomer—with 40 parts per hundred rubber (phr) PEG-200 and 3 wt% MNPs modified by citric acid surfactant—exhibits instantaneous and reversible color change when exposed to an external magnetic field. The color changing efficiency and fast response time of the magnetochromic elastomer developed here are suited to a variety of color tuning applications: e.g., bio-sensors and anticounterfeiting labels.
Original languageEnglish
Title of host publicationBioinspiration, Biomimetics, and Bioreplication XII
EditorsRaúl J. Martín-Palma, Mato Knez, Akhlesh Lakhtakia
Number of pages11
Volume2041
PublisherSPIE - The International Society for Optical Engineering
Publication date2022
Article number1204103
DOIs
Publication statusPublished - 2022
EventSPIE Smart Structures + Nondestructive Evaluation 2022 - Hilton Long Beach Hotel, Long Beach, United States
Duration: 6 Mar 202210 Mar 2022
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12482/1248205/Transparent-PDMS-fiber-actuator-with-ionic-liquid-based-electrodes/10.1117/12.2655769.full?SSO=1

Conference

ConferenceSPIE Smart Structures + Nondestructive Evaluation 2022
LocationHilton Long Beach Hotel
Country/TerritoryUnited States
CityLong Beach
Period06/03/202210/03/2022
Internet address
SeriesProceedings of SPIE - The International Society for Optical Engineering
ISSN0277-786X

Keywords

  • Magnetochromatic materials
  • Magnetochromic nanoparticles
  • Surfactant
  • PDMS

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