Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 17, Pages 20581-20588Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c03225
Keywords
magnetic particles; shape control; size control; surface modification; magnetorheological fluids
Funding
- Joining and Welding Research Institute (JWRI) Joint Research Collaboration Program, Osaka University
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) Management Expenses Grants for National Universities Corporations
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This study focuses on surface-modified Fe3O4@SiO2 particles with controlled sizes and shapes applied in magnetorheological (MR) fluids. Results show that surface modification with DTM improves dispersion stability, and the introduction of anisotropic shapes and increase in particle size contribute to the enhancement of MR properties.
This study is focused on surface-modified Fe3O4@SiO2 particles with precisely controlled sizes and shapes applied in magnetorheological (MR) fluids. After the preparation of the monodisperse spindle-shaped and cubic Fe3O4@SiO2 particles, surface modification with dodecyltrimethoxysilane (DTM) was carried out via a silane coupling reaction to increase the dispersion stability of the particles. Afterward, MR fluids were prepared by mixing the DTM-modified Fe3O4@SiO2 particles with silicon oil. Transmission electron microscopy observations demonstrated that spindle-shaped Fe3O4@SiO2 particles could form a more stable chain-like structure than cubic Fe3O4@SiO2 particles upon application of an external magnetic field. The rheological measurements of MR fluids also indicated that the surface modification with DTM, the introduction of anisotropic shapes, and the increase in the particle size all played positive roles in the improvement in MR properties.
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