Spreading and Detachment of Organic Droplets at an Electrified Interface

Ivošević, Nadica; Žutić, Vera

doi:10.1021/la970986z

Cited by 46 publications

(38 citation statements)

References 22 publications

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“…Following earlier observations of chronoamperometric spikes arising from the adhesion of cells and organic droplets on a dropping mercury electrode (DME), [156][157][158][159][160][161][162][163] and of similar signals upon adhesion of several other entities on the mercury surface, 164-168 a more detailed analysis of the nature of the interaction of liposomes in suspension and mercury electrodes was achieved by detecting chronoamperometric adhesion signals using multilamellar liposome suspensions and a static mercury drop electrode (SMDE). 169 These authors found that adhesion-spreading events lead to spike-shaped capacitive signals due to the changes of the double layer capacity and surface charge density at the area where the lipid island is formed.…”

Section: Chronoamperometry and The Study Of The Adhesion-spreadingmentioning

confidence: 99%

The Electrochemistry of Liposomes

Hernández

Scholz

2008

Israel Journal of Chemistry

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This review aims to summarize the current state of research concerning the interaction of electrodes with liposomes suspended in solutions. Main attention is given to the complex mechanism of adhesion and spreading of liposomes on mercury electrodes. That mechanism can be studied with the help of chronoamperometry, where each adhesion‐spreading event appears as a capacitive current spike. Integration of these spikes produces charge versus time transients that can be modeled and simulated, revealing the details of the multi‐step adhesion‐spreading process. Whereas the number of spikes per time mirrors the macro‐kinetics, the analysis of the time behavior of each spike mirrors the micro‐kinetics of each adhesion‐spreading event. The reviewed studies show that this approach provides a new tool to study the properties of liposome membranes. The adhesion‐spreading of liposomes on mercury electrodes has strong similarities to the process of vesicle fusion, which makes these studies a biomimetic model allowing one to deduce the effects of foreign molecules in bilayer membranes.

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Section: Chronoamperometry and The Study Of The Adhesion-spreadingmentioning

confidence: 99%

The Electrochemistry of Liposomes

Hernández

Scholz

2008

Israel Journal of Chemistry

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“…Although electrowetting on mercury was rst performed by Frumkin in the 1930s, and again by Ivošević andŽutić in 1998, similar results are reported here, with an emphasis on the lack of contact angle hysteresis shown by the system, to enable direct comparison with the electrowetting on solid metal surfaces. 7,18 Fig. 2 shows the electrowetting response for a droplet of dichloroethane (DCE) on the surface of a mercury electrode.…”

Section: Resultsmentioning

confidence: 99%

Reversible ultralow-voltage liquid–liquid electrowetting without a dielectric layer

Cousens

Kucernak

2017

Faraday Discuss.

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Electrowetting-on-dielectric devices typically have operating voltages of 10-20 V. A reduction in the operating voltage could greatly reduce the energy consumption of these devices. Herein, fully reversible one-electrolyte electrowetting of a droplet on a solid metal surface is reported for the first time. A reversible change of 29° for an 800 mV step is achieved. The effects of surface roughness, electrolyte composition, electrolyte concentration and droplet composition are investigated. It was found that there is a dramatic dependence of the reversibility and hysteresis of the system on these parameters, contrary to theoretical predictions. When a 3-chloro-1-propanol droplet is used, a system with no hysteresis and a 40° change in angle are obtained.

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“…1) (Berge 1993;Nakamura et al 1973Nakamura et al , 1977Janocha et al 2000;Kim 1999, 2000;Kim 2001;Lee et al 2002). A motion of the droplet's contact line results (Dimitrakopoulos and Higdon 1997;Vallet et al 1999;Decamps and Coninck 2000;Schneemilch et al 2000), and if the wetting modulation on the contact line is inhomogenous, a fluid motion can be observed (Moriarty et al 1991;Ivošević and Ž utić 1998). Spatial control in EWOD is accomplished by applying the voltage only on certain parts of the substrate-it is, e.g., partitioned into an array of controllable spots by an assembly of electrodes.…”

Section: Introductionmentioning

confidence: 99%

Insight into the micro scale dynamics of a micro fluidic wetting-based conveying system by particle based simulation

et al. 2012

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We simulate a microfluidic conveying system using the many-body dissipative particle dynamics method (MDPD). The conveying system can transport micro parts to a specified spot on a surface by letting them float inside or on top of a droplet, which is pumped by changing the wetting behaviour of the substrate, e.g., with electrowetting on dielectrics. Subsequent evaporation removes the fluid; the micro part remains on its final position, where a second substrate can pick it up. In this way, the wetting control can be separate from the final device substrate. The MDPD method represents a fluid by particles, which are interpreted as a coarse graining of the fluid's molecules. The choice of interaction forces allows for free surfaces. To introduce a contact angle model, non-moving particles beyond the substrate interact with the fluid particles by MDPD forces such that the required contact angle emerges. The micro part is simulated by particles with spring-type interaction forces.

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Spreading and Detachment of Organic Droplets at an Electrified Interface

Cited by 46 publications

References 22 publications

The Electrochemistry of Liposomes

The Electrochemistry of Liposomes

Reversible ultralow-voltage liquid–liquid electrowetting without a dielectric layer

Insight into the micro scale dynamics of a micro fluidic wetting-based conveying system by particle based simulation

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