Breakups of an encapsulated surfactant-laden aqueous droplet under a DC electric field

Soft Matter ◽  
2019 ◽  
Vol 15 (43) ◽  
pp. 8905-8911 ◽  
Author(s):  
Muhammad Salman Abbasi ◽  
Ryungeun Song ◽  
Jinkee Lee
Keyword(s):  
Electric Field ◽  
Castor Oil ◽  
Silicone Oil ◽  
Double Emulsion ◽  
Emulsion Droplet ◽  
Dc Electric Field ◽  
Aqueous Droplet

We study the breakups of a surfactant-laden aqueous/silicone oil/castor oil double emulsion droplet under an electric field.

Fluid dynamics of a double emulsion droplet in an electric field

1999 ◽  
Vol 11 (5) ◽  
pp. 1029-1041 ◽  
Author(s):  
Jong-Wook Ha ◽  
Seung-Man Yang
Keyword(s):  
Fluid Dynamics ◽  
Electric Field ◽  
Double Emulsion ◽  
Emulsion Droplet

Measurement of Interaction Forces at Small Distance under Electric Field in a Smectite Dispersed Silicone Oil Based ER Fluid

2001 ◽  
Vol 15 (06n07) ◽  
pp. 811-816 ◽  
Author(s):  
Toyohisa FUJITA ◽  
Toshio MIYAZAKI ◽  
Toshiharu TANAKA ◽  
Ke Jun Liu ◽  
Eiich KUZUNO ◽  
...  
Keyword(s):  
Electric Field ◽  
Silicone Oil ◽  
Small Distance ◽  
Surface Forces ◽  
Attraction Force ◽  
Interaction Forces ◽  
Repulsive Energy ◽  
Inflection Points ◽  
Dc Electric Field ◽  
Er Fluid

The apparatus to measure interaction forces under an electric field at small distance between a conductive hemisphere and a flat plate has been developed. The surface forces at small distance sandwiched ER fluid dispersing ultrafine smectite particles (20 to 50 nm thickness) in silicone oil has been measured. This fluid shows 0.7 kPa of apparent yield stress by applying 2.5 kV/mm of DC electric field. When an electric field applies to this ER fluid, the repulsive energy curves shows inflection points at about 0.2 μ m distance periodically at small distance of less than 1 μ m because the repulsion force decreases for a vacancy of particles after the particles are pushed out and the dipole attraction force acts between hemisphere and plate. On the other hand, when the electric field becomes off and it passes enough time, the inflection points is observed more shorter distance of about 0.15 μ m periodically. The coagulated particle size is estimated about 0.15 μ m under no electric field and becomes larger by applying electric field.

Electroviscoelastic Properties in ER Gel of Disperse System under DC Electric Field

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2433-2439 ◽  
Author(s):  
R. HANAOKA ◽  
S. TAKATA ◽  
H. FUJITA ◽  
T. FUKAMI ◽  
K. SAKURAI ◽  
...  
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Disperse System ◽  
Fine Particles ◽  
Silicone Oil ◽  
Dynamic Properties ◽  
Low Frequencies ◽  
Hydrosilylation Reaction ◽  
Microscopical Method ◽  
Dc Electric Field

The silicone oil-based electrorheological (ER) gel containing the non-aqueous fine particles was newly created in the present study. After these particles were dispersed at 30wt.% in the dimethylsilicone oil, the ER gel was produced by the hydrosilylation reaction in the mixture of the modified silicone oil. The reaction could considerably be promoted by heating at 90°C. The behavior of particles in the ER gel was observed by a microscopical method. When an electric field was applied to the ER gel, the gap between the electrodes was bridged by the chains of particles arranged in the direction of the electric field. The dynamic properties of the ER gel were also examined under the applied dc electric field up to 2kV/mm using the oscillating rheometer with the low frequencies of 1Hz or less. Consequently, it is shown that the electroviscoelastic effect of the gel can be controlled by the electric field strength.

Multimodal breakup of a double emulsion droplet under an electric field

Soft Matter ◽  
2019 ◽  
Vol 15 (10) ◽  
pp. 2292-2300 ◽  
Author(s):  
Muhammad Salman Abbasi ◽  
Ryungeun Song ◽  
Hyoungsoo Kim ◽  
Jinkee Lee
Keyword(s):  
Electric Field ◽  
Direct Current ◽  
Double Emulsion ◽  
Emulsion Droplet ◽  
Direct Current Electric Field ◽  
Current Electric Field

We study the multimodal breakup of a double emulsion droplet under a uniform direct current electric field.

ELECTRORHEOLOGY OF DISPERSIONS OF BaxSr(1-x)TiO3 IN SILICONE OIL UNDER AC OR DC ELECTRIC FIELD

2012 ◽  
Vol 26 (14) ◽  
pp. 1250081 ◽  
Author(s):  
GLAUBER M. S. LUZ ◽  
ANTONIO J. F. BOMBARD ◽  
SILVIO L. M. BRITO ◽  
DOUGLAS GOUVÊA ◽  
SHEILA L. VIEIRA
Keyword(s):  
Shear Stress ◽  
Shear Rate ◽  
Electric Field ◽  
Silicone Oil ◽  
Ferroelectric Materials ◽  
Dc Electric Field ◽  
Ac Fields ◽  
Er Fluid ◽  
Constant Shear Rate

Electrorheology (ER) of ferroelectric materials such as nanometric BaTiO 3 is still not fully understood. In this paper, nanoparticles of Ba x Sr (1-x) TiO 3 (where x = 0.8, 0.9 or 1.0) were synthesized using the method of Pechini, calcinated at 950°C, and after, lixiviated under pH 1 or pH 5. A controlled stress rheometer (MCR-301) was used to make the ER characterization of dispersions made of Ba x Ti 1-x O 3 in silicone oil (30% w/w), where (a) shear stress as a function of DC electric field (under constant shear rate) or (b) shear stress as a function of shear rate (under constant AC or DC electric field) were measured. We observed that electrophoresis occurred under electric field DC, creating a concentration gradient which induced phase separation in ER fluid. On the other hand, under AC fields above 1 kV/mm, the ER effect is stronger than for DC field, and almost without electrophoresis. Furthermore, there is an AC frequency, dependent on the disperse phase, where the ER effect has a maximum.

Mono-emulsion droplet stretching under direct current electric field

Soft Matter ◽  
2019 ◽  
Vol 15 (11) ◽  
pp. 2328-2335 ◽  
Author(s):  
Muhammad Salman Abbasi ◽  
Ryungeun Song ◽  
Sung-Min Kim ◽  
Hyoungsoo Kim ◽  
Jinkee Lee
Keyword(s):  
Electric Field ◽  
Direct Current ◽  
Experimental Studies ◽  
Emulsion Droplet ◽  
Direct Current Electric Field ◽  
Dc Electric Field ◽  
Current Electric Field

Theoretical, numerical and experimental studies on transient stretching and breakup of a mono-emulsion droplet under DC electric field.

Investigation on dynamics of double emulsion droplet in a uniform electric field

2013 ◽  
Vol 71 (3) ◽  
pp. 471-477 ◽  
Author(s):  
Purushottam Soni ◽  
Vinay A. Juvekar ◽  
Vijay M. Naik
Keyword(s):  
Electric Field ◽  
Double Emulsion ◽  
Uniform Electric Field ◽  
Emulsion Droplet

ELECTRORHEOLOGY OF DISPERSIONS OF BaXSr(1-X)TiO3 IN SILICONE OIL UNDER AC OR DC ELECTRIC FIELD

2011 ◽  
Author(s):  
GLAUBER M. S. LUZ ◽  
ANTONIO J. F. BOMBARD ◽  
SILVIO L. M. BRITO ◽  
DOUGLAS GOUVÊA ◽  
SHEILA L. VIEIRA
Keyword(s):  
Electric Field ◽  
Silicone Oil ◽  
Dc Electric Field

ELECTRORHEOLOGICAL BEHAVIOR OF MECHANOCHEMICALLY ACTIVATED KAOLINITE/TITANIUM OXIDE COMPOSITE

2005 ◽  
Vol 19 (07n09) ◽  
pp. 1409-1415 ◽  
Author(s):  
BAOXIANG WANG ◽  
XIAOPENG ZHAO
Keyword(s):  
Electric Field ◽  
Titanium Oxide ◽  
Silicone Oil ◽  
Sol Gel ◽  
Shear Stresses ◽  
Mechanochemical Method ◽  
Oxide Composite ◽  
Electrorheological Effect ◽  
Dc Electric Field ◽  
Gel Technique

By means of the combination of mechanochemical method and sol-gel technique the modified kaolinite/titanium oxide composite was prepared. The structure analyses XRD, EDS showed that composite was consisted of the mechanochemically activated kaolinite/ NaCl complex coating with titanium oxide. A distinct enhancement in the electrorheological effect under DC electric field was found by using such particles dispersed in silicone oil. The shear stresses of modified kaolinite/titanium oxide suspension were about 9.5 kPa at 4kV/mm, which are 11.5 times of that of pure kaolinite ERF and 2.2 times of that of kaolinite/ TiO 2 ERF reported previous respectively.

YIELD PROCESS OF ELECTRORHEOLOGICAL FLUID WITH POLYANILINE PARTICLE

1994 ◽  
Vol 08 (25) ◽  
pp. 1563-1575 ◽  
Author(s):  
KIYOHITO KOYAMA ◽  
KEIJI MINAGAWA ◽  
TAMOTSU YOSHIDA ◽  
NORIYUKI KURAMOTO ◽  
KATSUFUMI TANAKA
Keyword(s):  
Shear Stress ◽  
Electric Field ◽  
Particle Concentration ◽  
Silicone Oil ◽  
Electrorheological Fluid ◽  
Yield Behavior ◽  
Wide Range ◽  
Dc Electric Field ◽  
Er Fluid ◽  
Flow Experiments

Electrorheological behaviors of polyaniline/silicone oil suspension were observed by using a modified Couette type rheometer with high resolution for shear stress. The yield behaviors were examined over a wide range of shear strain. The storage modulus and loss tangent were determined under a constant dc electric field. It was clarified that the polyaniline-based ER fluid yields two different strain amplitudes, i.e. about 1% and 50%. The stress-strain curves obtained from shear flow experiments also suggested the existence of two-step yield process. The yield process was found to be dependent on the electric field strength and the particle concentration in different manners. The yield behavior observed is discussed in relation to the structure of particle clusters which causes the ER effect.

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