Electrorheological response of modified silica suspensions

Cherif, Khaled; Moalla, Salma; Sassi, Sadok; Zarrouk, H.

doi:10.1016/j.jeurceramsoc.2006.05.094

Cited by 12 publications

(10 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The analysis of individual mechanisms of the ERE shows that the main reason for the considerable increase in the "electroviscosity" of the concentrated disperse systems in an electric field is the structure formation [13]. [17] for the ERE to be observed. Hence, in this study,…”

Section: Effect Of Electric Field On Erementioning

confidence: 99%

Effect of Electric Field Strength and Water Content on the Electrorheology of Silica Dispersions

Kwaambwa¹

2017

MSA

View full text Add to dashboard Cite

The effect of water content on the electrorheological effect (ERE) behaviour of silica dispersions has been investigated. The types of silica powders were fumed silica, precipitated and acid washed silica and colloidal silica. Silica dispersions with a water content varying in the range 10%-30%, and with conducting ions deliberately added, were redispersed in chlorinated hydrocarbon oil and then the ER behaviour studied. Samples were tested on a static yield rig (SYR), an instrument which can measure both the yield stress and the conductivity. The effects of electric field strength and water content on the ERE were studied. The yield stress initially increased with increase in electric field strength and then decreased at high electric fields suggesting a breakdown in structure of the electrorheological fluid samples tested. It was also found that the ERE increased and electric saturation or electric breakdown shifted to lower electric fields as the water content increased. Higher electric fields caused a drop in the ERE.

show abstract

Section: Effect Of Electric Field On Erementioning

confidence: 99%

Effect of Electric Field Strength and Water Content on the Electrorheology of Silica Dispersions

Kwaambwa¹

2017

MSA

View full text Add to dashboard Cite

show abstract

“…The latter is suggestive of a strong interaction between the solid particles and oils [38]. To better quantify such an effect, we study the permeability of different oils through columns of solid particles by the Washburn method [33], as well as the adsorption of different oils on the solid particles' surface through FT-IR spectra. Permeability can be simply compared by the slopes in the plot of the square of the height H 2 (permeated oil in the capillary tube) as a function of time t, shown in figure 5.…”

Section: Permeability and Adsorption Characteristicsmentioning

confidence: 99%

“…These include semiconductive polymers [15][16][17][18], metal-or metal-oxide-doped titania or titanate [19][20][21][22], intercalated clay composites [23,24], organic layers modifying titania or silica [25][26][27], mesoporous composites and nanocomposites, etc [28][29][30][31][32]. Although there have been reports on the ER-enhancing effect through the dispersing media [33][34][35][36], none has systematically investigated the role of the dispersing liquid. This is largely due to the conventional wisdom that the dispersing liquid plays only a passive role in providing a large mismatch between the dielectric constants of solid particles and oil.…”

Section: Introductionmentioning

confidence: 99%

Influence of liquid phase on nanoparticle-based giant electrorheological fluid

Gong

Huang

et al. 2008

Nanotechnology

View full text Add to dashboard Cite

We show that the chemical structures of silicone oils can have an important role in the giant electrorheological (GER) effect. The interaction between silicone oils and solid nanoparticles is found to significantly influence the ER effect. By increasing the kinematic viscosity of silicone oils, which is a function of siloxane chain length, sol-like, gel-like and clay-like appearances of the constituted ER fluids were observed. Different functional-group-terminated silicone oils were also employed as the dispersing media. Significant differences of yield stress were found. We systematically study the effect of siloxane chain lengths on the permeability of oils traveling through the porous spaces between the particles (using the Washburn method), oils adsorbed on the particles' surface (using FT-IR spectra), as well as their particle size distribution (using dynamic light scattering). Our results indicate the hydrogen bonds are instrumental in linking the silicone oil to GER solid particles, and long chain lengths can enhance the agglomeration of the GER nanoparticles to form large clusters. An optimal oil structure, with hydroxyl-terminated silicone oil and a suitable viscosity, was chosen which can create the highest yield stress of ∼300 kPa under a 5 kV mm(-1) DC electric field.

show abstract

“…Indeed, several works have discussed the ER behavior of fluids containing silica [3,[5][6][7], and mesoporous silica [8][9][10][11]. Several strategies have also been adopted to improve the dielectric properties and polarizability of silica particles, including incorporation of small, such molecules as water [6], urea [12][13], as well as some cation ions [6,[14][15]. Another interesting approach involves the use of organically modified silica (ORMOSIL) to develop stable dispersions and increase the polarizability.…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid-based organically modified silica for the development of new electrorheological fluids

Marins

Soares

2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

To cite this version:Jéssica Alves Marins, Bluma Soares. Ionic liquid-based organically modified silica for the development of new electrorheological fluids. Colloids The presence of the silylated ionic liquid covalently attached to the silica particles was confirmed by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The effect of the amount of imidazolium-based ionic liquid immobilized on the spherical silica particles on the electrorheological (ER) behavior of the corresponding suspensions in silicone oil was investigated. A significant ER effect was observed for the fluid containing silica modified with around 10%wt. of IL-TMOS. In fact, a very good, extremely rapid and reversible response under the action of an electric field at intensity to 4 kV/mm was achieved, with shear stress value as high as 2200 Pa. The dielectric properties were also evaluated to explain the ER response of these IL-ORMOSIL particles

show abstract

Electrorheological response of modified silica suspensions

Cited by 12 publications

References 18 publications

Effect of Electric Field Strength and Water Content on the Electrorheology of Silica Dispersions

Effect of Electric Field Strength and Water Content on the Electrorheology of Silica Dispersions

Influence of liquid phase on nanoparticle-based giant electrorheological fluid

Ionic liquid-based organically modified silica for the development of new electrorheological fluids

Contact Info

Product

Resources

About