Electrorheological properties of polyimide nanoparticles suspensions

Данилин, А. Н.; Kydralieva, Kamila; Semenov, N. A.; Kelbysheva, E. S.

doi:10.1016/j.matpr.2020.03.049

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…The ER efficiency, e (eqn (1)), is a very important property for ER fluids. Some previous ER fluids cannot achieve a satisfactory value, 29–31 one of the reasons for which is the unsatisfactory rheological properties. In this work, the efficiency can be calculated as:where τ E is the static yield stress in the presence of the external electric field, and τ 0 is the field-off static yield stress.…”

Section: Resultsmentioning

confidence: 99%

Enhanced response of titanium doped iron(ii) oxalate under electric field

Chen

et al. 2022

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Enhanced response of titanium doped iron(ii) oxalate under electric field

Chen

et al. 2022

RSC Adv.

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“…When applying an electric voltage to ER, polyimide particles showing negative electrorheological effects did not move towards power lines and did not create structured chains, but started rotating around their axis with precession [17] or separating on the cathode. Entering the polar-sulfonic group [13] into a polyimide structure allowed creating polymers without articulated bonds with a direct ER effect. It also opened the extended possibilities for functional modifications.…”

Section: Electrorheological Experimentsmentioning

confidence: 99%

“…Previously, we obtained polyimides that have in the polymer chain a polar and chemically active sulfo group, which is useful for injecting new atoms or groups [13]. In this paper, a new material containing polyimide with Na salt salt-acid fragments and fluorinated groups in the side chain as the dispersed phase is obtained.…”

Section: Introductionmentioning

confidence: 99%

Electrorheological Behavior of Suspensions of Polyimide-Based on the Sodium Salt of 2,5-Diaminobenzenesulfonic Acid

et al. 2020

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Electrorheological suspensions (ERS) of polyimide particles with organoelement fragments from the sodium salt of 2,5-diaminobenzene sulfonic acid were obtained for the first time. Their rheological and electrorheological characteristics, their dependence on the parameters of deformation, and the intensity of the external electric field were studied. It was found that the ERS of PI-Na polyimide particles have a significant electrorheological response. Solid-polyimide materials were previously studied using a scanning electron microscope. The effect of the polyimide concentration on the properties of the solution was studied by spectrophotometry. It was shown that polyimide suspension is a result of increasing intensity as the electric field changes the flow type from Newtonian to pseudoplastic due to polarization of the particles and formation of the chain structures along the power lines of the electric field. The influence of temperature on the change of rheological and electrorheological properties of a polyimide ERS in constant electric fields was investigated.

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Electrostatic Stabilization of Nano Liquid Metals in Doped Nonpolar Liquids

Kim

Jeong

Hyun

et al. 2021

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their range of applications could be substantially extended beyond the traditional ones based on liquid metals as a continuous fluid. To date, liquid-metal particles of micro-or nano-sizes have demonstrated promising performances in diverse research areas such as self-healing electronics, [8,9] thermal interface materials, [10,11] catalytic reaction implementation, [12] drug delivery, [13] and plasmonics. [14] Among the various methods developed for manufacturing liquid-metal particles, [15,16] sonication is most commonly employed, [5][6][7] which breaks the bulk liquid metal into small entities in a desired solvent. The dispersed liquid-metal particles have a thin oxide skin that forms spontaneously on a surface, [1] which prevents liquidmetal droplet coalescence and allows them to maintain their particulate form. The modulation of the surface oxide, typically with the support of surface-bound ligands, [17,18] can be used to precisely control the mechanical, electrical, and optical properties of liquid-metal particles that carry the liquid-state core under the outermost oxide surface. This can provide unique opportunities that are inaccessible by conventional all-solid-state metal and metal oxide particles.Despite the large number of studies on the preparation and applications of micro-and nano-sized liquid-metal particles reported to date, less attention has been focused on the colloidal behavior of such particles suspended in liquid media. To the best of our knowledge, no studies have been conducted on liquid-metal colloids in highly nonpolar organic solvents such as saturated hydrocarbons. Nonpolar colloidal dispersions are crucial in various industrial applications, the best-known example of which is the electronic ink embedded in an electrophoretic display. [19][20][21][22] Owing to the low electrical conductivity of nonpolar solvents, the power consumption of electrophoretic displays is low, which can be beneficial in the development of emerging portable and wearable Internet-of-Things (IoT) devices. Thus, classical electronic ink technology was recently combined with a triboelectric nanogenerator (TENG) to develop self-powered and low-power-consumption electronic paper. [23] Other useful applications of nonpolar dispersions include oilbased printing toners for electrostatic lithographic printers, [24] electrorheological fluids, [25,26] photonic crystals, [27] and drug delivery systems. [28] While conventional nonpolar dispersions used in such applications employ all-solid-state particles, new Liquid metals and alloys are attracting renewed attention owing to their potential for application in various advanced technologies. Eutectic galliumindium (EGaIn) has been focused on in particular because of its integrated advantages of high conductivity, low melting point, and low toxicity. In this study, the colloidal behavior of nano-dispersed EGaIn in nonpolar oils is investigated. Although the nonpolar oil continuous phase is commonly considered to be free of electric charges, electrostatic repulsion appears to...

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Electrorheological properties of polyimide nanoparticles suspensions

Cited by 5 publications

References 3 publications

Enhanced response of titanium doped iron(ii) oxalate under electric field

Enhanced response of titanium doped iron(ii) oxalate under electric field

Electrorheological Behavior of Suspensions of Polyimide-Based on the Sodium Salt of 2,5-Diaminobenzenesulfonic Acid

Electrostatic Stabilization of Nano Liquid Metals in Doped Nonpolar Liquids

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