Development of Novel Colorful Electrorheological Fluids

Herein, the electrorheological (ER) performances of ER fluids were correlated with their colors to allow for the visual selection of the appropriate fluid for a specific application using naked eyes. A series of TiO2-coated synthetic mica materials colored white, yellow, red, violet, blue, and green...

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-09, Vol.12 (18), p.3113
Main Authors: Jekal, Suk, Kim, Jiwon, Lu, Qi, Kim, Dong-Hyun, Noh, Jungchul, Kim, Ha-Yeong, Kim, Min-Jeong, Kim, Min-Sang, Oh, Won-Chun, Choi, Hyoung-Jin, Yoon, Chang-Min
Format: Article
Language:English
Subjects:
Calcium ions
Coatings
Color
colorful
Electric fields
Electrical conductivity
Electrical resistivity
Electrorheological fluids
Fluids
Light
Light effects
light interference
Metal oxides
Mica
pearlescent
Phase transitions
Scanning electron microscopy
Silicon
Silicones
Sol-gel processes
Sustainable materials
Thickness
TiO2 coating
Titanium dioxide
Viscosity
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Summary:Herein, the electrorheological (ER) performances of ER fluids were correlated with their colors to allow for the visual selection of the appropriate fluid for a specific application using naked eyes. A series of TiO2-coated synthetic mica materials colored white, yellow, red, violet, blue, and green (referred to as color mica/TiO2 materials) were fabricated via a facile sol–gel method. The colors were controlled by varying the thickness of the TiO2 coating layer, as the coatings with different thicknesses exhibited different light interference effects. The synthesized color mica/TiO2 materials were mixed with silicone oil to prepare colored ER fluids. The ER performances of the fluids decreased with increasing thickness of the TiO2 layer in the order of white, yellow, red, violet, blue, and green materials. The ER performance of differently colored ER fluids was also affected by the electrical conductivity, dispersion stability, and concentrations of Na+ and Ca2+ ions. This pioneering study may provide a practical strategy for developing new ER fluid systems in future.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12183113