Background: Layered inorganic materials are important candidates as smart electrorheological
(ER) materials because of their low cost and anisotropic morphology. However, the ER effect
of most of layered materials is too weak to satisfy the requirement of applications. This paper reported
a new kind of layered ER material based on polyaniline-intercalated titanate nanoplates (PANITNP).
We presented the preparation, structure characterization, and rheological measurement. And finally
we conducted dielectric spectra to analyze the mechanism of enhanced ER effect after intercalation
of conducting PANI into TNP.
Methods: An intercalation chemical process was used to prepare the aniline-intercalated titanate
nanoplates and then an oxidative polymerization was further employed to prepare PANI-TNP. Different
techniques including scanning electron microscopy, X-ray powder diffraction, Fourier transform
infrared spectrometer, thermogravimetric analysis were used to analyze the morphology, structure and
thermal properties of samples. A stress-controlled electro-rheolometer was used to measure the
rheological curve of PANI-TNP ER suspensions. Two-point method was used to measure the DC
conductivity. An impedance analyzer was used to analyze the dielectric spectra.
Results: The structure characterization showed that the PANI-TNP possessed 100 nm thickness and
500-1000 nm lateral size, and PANI was intercalated into the interlayer of layered titanate with weight
content of ~ 9%. Under electric fields, the investigation about rheological properties of suspension
containing PANI-TNP showed that the PANI-TNP suspension exhibited significantly higher ER effect
compared to the suspensions containing pure TNP. At the same electric field, the shear stress and ER
efficiency of PANI-TNP suspension was 2.5 times and 7 times as high as those of pure TNP suspension.
The dielectric measurements indicated that the intercalation of conducting PANI into TNP significantly
improved particle polarization, which was in accordance with its enhanced ER effect.
Conclusion: To enhance ER effect of layered materials, this paper developed a kind of polyanilineintercalated
titanate nanoplates (PANI-TNP). The intercalation of conducting polyaniline into TNP
could significantly improve the particle polarization and this results in the enhancement of ER effect