Superior nanocomposites of phosphonium-based poly(ionic liquid) with halloysite and graphene oxide: Electrorheological investigations

CALIS-ISMETOGLU, Gokce; UNAL, Halil Ibrahim

doi:10.1016/j.eurpolymj.2024.112894

Cited by 2 publications

(1 citation statement)

References 60 publications

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“…The typical τ d values of ieCOF-390 and ieCOF-420 ER fluids are 1693 and 1605 Pa at 3.0 kV/mm, respectively. They are also higher than those of ion-dominated iCOF ER fluid, linear PIL ER fluid, cross-linked PIL ER fluid, HNT/GO/PPIL/SO, and far higher compared to that of electron-dominated carbon-based ER fluid , and polyaniline ER fluid, as displayed in Figure f. We used the power-law formula τ d ∝ E α to fit the correlation between τ d and the electric field intensity ( E ).…”

Section: Resultsmentioning

confidence: 99%

Mixed Ionic–Electronic Covalent Organic Frameworks as a Platform for High-Performance Electro-Responsive Smart Materials

Ma,

Nie,

Wang

et al. 2024

Chem. Mater.

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Ionic covalent organic framework (iCOF) materials are providing a potential platform to develop next-generation electro-responsive smart materials because of ion movementinduced interfacial polarization. However, it is challenging to achieve strong interfacial polarization while reducing electrode polarization due to the nature of pure ions as charge carriers in iCOF. In this article, we developed a mixed ionic−electronic covalent organic framework (ieCOF), which can overcome this challenge. This ieCOF was prepared by thermal cracking of taskspecific ionic liquids. It shows that ieCOF is composed of a positively charged slight-carbonized framework attracted with fluoric counteranions. Through changing the heating target temperature, ieCOF with different ion contents and different carbonized level frameworks can be obtained. We find that compared with the ion-dominated system, the mixed ionic−electronic ieCOF can achieve a stronger interfacial polarization but a weaker electrode polarization. Consequently, the ieCOF has a higher electro-responsive electrorheological (ER) effect but lower leaking current density. In particular, increasing the temperature can promote the interfacial polarization intensity, resulting in a higher ER effect. The present result shows that ieCOF can provide a platform to design and develop high-performance electro-responsive smart materials.

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Section: Resultsmentioning

confidence: 99%

Mixed Ionic–Electronic Covalent Organic Frameworks as a Platform for High-Performance Electro-Responsive Smart Materials

Ma,

Nie,

Wang

et al. 2024

Chem. Mater.

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A universal yield stress equation for electrorheological fluids

Chung,

Jhon,

Choi

2024

Physics of Fluids

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In this study, we investigate the universality of the yield stress [τyE0, where E0 is electric field strength] for examining electrorheological (ER) fluids both experimentally and theoretically. We found that the published experimental data for the yield stress of ER fluids for various materials and measurement conditions obey a yield stress scaling equation. In other words, the ER yield stress data in the literature collapse onto a universal correlation: τ̂=1.313Ê3/2tanhÊ using scaled variables τ̂≡τyE0/τyEc and Ê≡E0/Ec. Here, Ec is critical electric field strength. Although this expression is attractive for experimentalists, this empirical equation has not been derived from first principles. We introduce a mesoscopic elementary region concept and justify this universal correlation for the first time. We decompose the ER system into a finite number of elementary regions and introduce “glueons,” which adhere to neighboring elementary regions resulting in fibrillary structures. We investigated the limiting case when the elementary region size is reduced to zero (continuum limit) and used a reaction-diffusion model to calculate glueon concentration. In modeling the reaction term (generation of glueons), we used a linear model by recognizing that the electric field activates glueons, i.e., the number of glueons increases as the electric field strength increases. In our preliminary study, we were able to justify a universal correlation by solving the glueon concentration equation using a simple geometry. The novelty of this work is the development of universality for the ER yield stress and derivation of a universal scaling equation.

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Superior nanocomposites of phosphonium-based poly(ionic liquid) with halloysite and graphene oxide: Electrorheological investigations

Cited by 2 publications

References 60 publications

Mixed Ionic–Electronic Covalent Organic Frameworks as a Platform for High-Performance Electro-Responsive Smart Materials

Mixed Ionic–Electronic Covalent Organic Frameworks as a Platform for High-Performance Electro-Responsive Smart Materials

A universal yield stress equation for electrorheological fluids

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