Limited Electron-Dominated Electrorheological Response with TiO<sub>2</sub> Buffer Layer.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40138541.
- Also identified by DOI 10.1021/acs.nanolett.4c05619.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
We report porous carbon sphere electrorheological (ER) nanoparticles coated with a titanium dioxide layer (HCs@TiO<sub>2</sub>). Utilizing the buffering effect of amorphous TiO<sub>2</sub>, the HCs@TiO<sub>2</sub> ER fluid (ERF) shows a yield stress that exceeds that of previous carbon-based ER nanomaterials. The mechanisms of the high ER response are elucidated through the analysis of the dielectric properties, demonstrating that the amorphous TiO<sub>2</sub> shell not only restricts the electron-dominated motion but also significantly improves the interfacial polarization. Furthermore, the HCs@TiO<sub>2</sub> ERF exhibits superior sedimentation stability and low current density, which is attributed to the formation of a hydrogen bond network. The rheological behavior of HCs@TiO<sub>2</sub> ERF is analyzed using the Bingham and Cho-Choi-Jhon model, where the dynamic yield stress as a function of electric field strength is fitted using a generalized yield stress equation. These analyses indicate that local electrostatic accumulation between the hybrid shells benefits the ER response.