Hollow TiO2 Nanoparticles Capped with Polarizability-Tunable Conducting Polymers for Improved Electrorheological Activity

Hollow TiO2 nanoparticles (HNPs) capped with conducting polymers, such as polythiophene (PT), polypyrrole (PPy), and polyaniline (PANI), have been studied to be used as polarizability-tunable electrorheological (ER) fluids. The hollow shape of TiO2 nanoparticles, achieved by the removal of the SiO2...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-10, Vol.12 (19), p.3521
Main Authors: Lee, Seungae, Noh, Jungchul, Jekal, Suk, Kim, Jiwon, Oh, Won-Chun, Sim, Hyung-Sub, Choi, Hyoung-Jin, Yi, Hyeonseok, Yoon, Chang-Min
Format: Article
Language:English
Subjects:
Capping
Conducting polymers
Current carriers
Dielectric properties
Electric fields
Electrophoretic mobility
Electrorheological fluids
hollow TiO2 nanoparticles
Microscopy
Nanocrystals
Nanoparticles
Polarizability
Polyanilines
Polymerization
Polymers
Polypyrroles
Polythiophene
Shells
Silicon dioxide
Silicones
Space charge
Spectrum analysis
surface modification
Synergistic effect
Titanium dioxide
Vapor deposition
Viscoelasticity
Yield strength
Yield stress
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Summary:Hollow TiO2 nanoparticles (HNPs) capped with conducting polymers, such as polythiophene (PT), polypyrrole (PPy), and polyaniline (PANI), have been studied to be used as polarizability-tunable electrorheological (ER) fluids. The hollow shape of TiO2 nanoparticles, achieved by the removal of the SiO2 template, offers colloidal dispersion stability in silicone oil owing to the high number density. Conducting polymer shells, introduced on the nanoparticle surface using vapor deposition polymerization method, improve the yield stress of the corresponding ER fluids in the order of PANI < PPy < PT. PT-HNPs exhibited the highest yield stress of ca. 94.2 Pa, which is 5.0-, 1.5-, and 9.6-times higher than that of PANI-, PPy-, and bare HNPs, respectively. The improved ER response upon tuning with polymer shells is attributed to the space charge contribution arising from the movement of the charge carriers trapped by the heterogeneous interface. The ER response of studied ER fluids is consistent with the corresponding polarizability results as indicated by the permittivity and electrophoretic mobility measurements. In conclusion, the synergistic effect of hollow nanostructures and conducting polymer capping effectively enhanced the ER performance.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12193521