Dielectric properties of modified montmorillonites suspensions in polydimethylsiloxane

Kuznetsov, Nikita M.; Шевченко, В. Г.; Stolyarova, Dina Yu.; Ozerin, S. A.; Белоусов, С. И.; Чвалун, С. Н.

doi:10.1002/app.46614

Cited by 24 publications

(13 citation statements)

References 27 publications

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“…Comparing the dielectric properties of halloysite with various modified montmorillonites, aluminosilicates with another layered morphology [25][26][27], it can be seen that the dielectric constant value of halloysite is only by order of magnitude lower than for the sodium form of montmorillonite (ε' = 8.09•10 5 ) and the conductivity is lower in more than 50 times (σ' = 6.10•10 -7 S/cm), respectively. As we show below, such difference open the opportunity to use halloysite as filler for ERFs at higher electric field compared to the sodium form of montmorillonite [26].…”

Section: Resultsmentioning

confidence: 99%

Halloysite nanotubes: Prospects in electrorheology

Kuznetsov¹,

Stolyarova²,

Белоусов³

et al. 2018

Express Polym. Lett.

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Electrorheological fluids based on polydimethylsiloxane filled with halloysite nanotubes were studied. The filler structure was characterized by TEM, SEM, and X-ray diffraction. When an electric field is applied to suspensions, their rheological behavior changes-the contribution of the elastic component becomes significant and samples behave like a solid body. The effect of the electric field and filler concentration on the electrorheological behavior was investigated. The influence of water content on the filler structure, as well as on electrorheological and electrophysical properties of suspensions, was considered. Electrorheological fluids filled by halloysite with small water content exhibit slightly higher rheological characteristics under an electric field than dried ones. This study shows the prospects of using halloysite nanotubes as a dispersed phase for electrorheological fluids.

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Section: Resultsmentioning

confidence: 99%

Halloysite nanotubes: Prospects in electrorheology

Kuznetsov¹,

Stolyarova²,

Белоусов³

et al. 2018

Express Polym. Lett.

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“…The appearance of yield stress and the increase in viscosity of CNa samples were observable up to electric field of 2.5 kV mm −1 . To apply higher field to CNa samples was impossible due to the electric breakdown in the system, because of water effect and Na + cations released into the solution during filler exfoliation. Meanwhile, there is no effect of electric field on PDMS behavior.…”

Section: Resultsmentioning

confidence: 99%

Electrorheological behavior of low filled suspensions of highly anisometric montmorillonite particles

Stolyarova

Kuznetsov

Белоусов

et al. 2019

J of Applied Polymer Sci

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The electrorheological (ER) behavior of modified montmorillonite (MMT) suspensions in polydimethylsiloxane is studied. As established by rotational viscometry, the samples with a dispersed phase concentration from 1 to 8 wt % reveal viscous Newtonian behavior and dramatically change their properties to elastic when electric field is applied. The rheological characteristics of the suspensions over 0–7 kV mm−1 range of electric field strengths are also studied. Novel X‐ray diffraction method is developed to evaluate the suspension of the filler in a siloxane medium and to calculate the degree of its exfoliation. The dependence of exfoliation degree, dielectric, and ER characteristics on the type of modifier in the MMT structure is considered. Based on the obtained data, a new model of system behavior with the various types of fillers is proposed and the prospects of utilizing MMT as a filler for ER fluids are demonstrated. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47678.

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“…For the sake of clarity, the data corresponding to these two 2 wt.% dispersions are plotted with Y-axis in linear scale in an inset. The broadness of the ε -peak is caused by overlapping peaks due to the different orientations of the nanocellulose particles in suspension [26]. This result might be a consequence of nanocrystals and nanofibrils with varying diameters and lengths.…”

Section: Preliminary Evaluation Of the Nanofluids' Electro-sensitive Potential By Dielectric Characterizationmentioning

confidence: 99%

Preliminary Insights into Electro-Sensitive Ecolubricants: A Comparative Analysis Based on Nanocelluloses and Nanosilicates in Castor Oil

et al. 2020

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The newest generation of lubricants needs to adapt to stricter environmental policies. Simple and sustainable formulations with tunable rheological properties under the action of electric potentials may be the key. The present research explored the feasibility of producing electro-sensitive ecolubricants based on nanocellulose (crystalline and fibrillar) or nanoclay (Cloisite 15A montmorillonite and halloysite nanotubes) dispersions in castor oil, at concentrations that ranged from 2 to 6 wt.%. Broadband dielectric spectroscopy (BDS) measurements allowed for a first estimate on the electro-responsive potential of the nanofluids. The nanocelluloses and the montmorillonite suspensions presented a relaxation event in the dielectric loss, ε″, centered at ca. 2–4 kHz, which is related to interfacial polarization. Moreover, their actual electro-rheological (ER) effect under high electric potentials up to 4 kV/mm was assessed by determining the magnitude of the yield stress from steady flow curves at 25 °C. It was found that the nanocelluloses and the montmorillonite showed an enhancement of three orders of magnitude in their yield stress values at 4 kV/m. This enhancement was much greater than in the halloysite nanoclay, which did not exhibit any polarization). This is the starting point for the development of environmentally friendly ER lubricating fluids, based on nanocellulose and montmorillonites (layered nanosilicates), which might assist in reducing the friction and wear through the application of controlled electric fields.

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Dielectric properties of modified montmorillonites suspensions in polydimethylsiloxane

Cited by 24 publications

References 27 publications

Halloysite nanotubes: Prospects in electrorheology

Halloysite nanotubes: Prospects in electrorheology

Electrorheological behavior of low filled suspensions of highly anisometric montmorillonite particles

Preliminary Insights into Electro-Sensitive Ecolubricants: A Comparative Analysis Based on Nanocelluloses and Nanosilicates in Castor Oil

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