Anomalous Pull-Off Forces between Surfactant-Free Emulsion Drops in Different Aqueous Electrolytes

Lockie, Hannah; Manica, Rogério; Tabor, Rico F.; Stevens, Geoffrey W.; Grieser, Franz; Chan, Derek Y. C.; Dagastine, Raymond R.

doi:10.1021/la204753y

Cited by 15 publications

(10 citation statements)

References 39 publications

(70 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the other area where this model is limited in in the area of specific ion effects. There are AFM data for simple systems, in the absence of any surfactant for both polar [83] and non-polar oils [84], suggesting there are surface force effects that have yet to be captured in a reproducible way, hindering efforts to describe a well-defined surface force model.…”

Section: Discussionmentioning

confidence: 99%

Mapping coalescence of micron-sized drops and bubbles

Berry

Dagastine

2017

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

Emulsion formulation, solvent extraction and multiphase microfluidics are all examples of processes that require precise control of drop or bubble collision stability. We use a previously validated numerical model to map the exact conditions under which micron-sized drops or bubbles undergo coalescence in the presence of colloidal forces and hydrodynamic effects relevant to Brownian motion and low Reynolds number flows. We demonstrate that detailed understanding of how the equilibrium surface forces vary with film thickness can be applied to make accurate predictions of the outcome of a drop or bubble collision when hydrodynamic effects are negligible. In addition, we illuminate the parameter space (i.e. interaction velocity, drop deformation, interfacial tension, etc.) at which hydrodynamic effects can stabilise collisions that are unstable at equilibrium. Further, we determine conditions for which drop or bubble collisions become unstable upon separation, caused by negative hydrodynamic pressure in the film. Lastly, we show that scaling analyses are not applicable for constant force collisions where the approach timescale is comparable to the coalescence timescale, and demonstrate that initial conditions under these circumstances cannot be ignored.

show abstract

Section: Discussionmentioning

confidence: 99%

Mapping coalescence of micron-sized drops and bubbles

Berry

Dagastine

2017

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…Whereas, the shell was "harder" with a dense structure, due to a higher degree of polymerization. [18][19][20][21][22][23] St monomers and short oligomers in the interior of particles could be extracted when the EtOH-H 2 O mixture was added to the MM. Fig.…”

Section: Synthesis Of Ps Particles With Diverse Morphologiesmentioning

confidence: 99%

Shape engineering of polystyrene particles from spherical to raspberry-like to hollow flower-like via one-step non-surfactant self-templating polymerization of styrene in ethanol–water mixtures

et al. 2020

View full text Add to dashboard Cite

show abstract

“…These salts were heated to within 50 °C of their respective melting points for 7 h before use to remove any organic contaminants. 14 Laser Tweezers Instrument. The instrument was described previously.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Controlled Particle Collision Leads to Direct Observation of Docking and Fusion of Lipid Droplets in an Optical Trap

et al. 2014

View full text Add to dashboard Cite

As an intracellular organelle, phospholipid-coated lipid droplets have shown increasing importance due to their expanding biological functions other than the lipid storage. The growing biological significance necessitates a close scrutiny on lipid droplets, which have been proposed to mature in a cell through processes such as fusion. Unlike phospholipid vesicles that are well-known to fuse through docking and hemifusion steps, little is known on the fusion of lipid droplets. Herein, we used laser tweezers to capture two micrometer-sized 1,2,3-trioleoylglycerol (triolein) droplets coated with 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) that closely resemble intracellular lipid droplets. We started the fusion processes by a well-controlled collision between the two lipid droplets in phosphate buffer at pH 7.4. By monitoring the change in the pathway of a trapping laser that captures the collided lipid droplets, docking and physical fusion events were clearly distinguished for the first time and their lifetimes were determined with a resolution of 10 μs after postsynchronization analysis. Our method revealed that the rate-limiting docking process is affected by anions according to a Hofmeister series, which sheds light on the important role of interfacial water shedding during the process. During the physical fusion, the kinetics between bare triolein droplets is faster than lipid droplets, suggesting that breaking of phospholipid coating is involved in the process. This scenario was further supported by direct observation of a short-lived hemifusion state with ∼46 ms lifetime in POPC-coated lipid droplets, but not in bare triolein droplets.

show abstract

Anomalous Pull-Off Forces between Surfactant-Free Emulsion Drops in Different Aqueous Electrolytes

Cited by 15 publications

References 39 publications

Mapping coalescence of micron-sized drops and bubbles

Mapping coalescence of micron-sized drops and bubbles

Shape engineering of polystyrene particles from spherical to raspberry-like to hollow flower-like via one-step non-surfactant self-templating polymerization of styrene in ethanol–water mixtures

Controlled Particle Collision Leads to Direct Observation of Docking and Fusion of Lipid Droplets in an Optical Trap

Contact Info

Product

Resources

About