Marangoni effect can be seen effectively in nano-emulsions where the two liquids are with different densities and surface tensions. But due to this difference that is caused at the interface, a gradient is formed. The liquids flowing away from the interface are joined by the liquids drawn into the interface due to viscous drag... Once stability is achieved in the interface, the droplet becomes more stable. When nanoemulsion particles are in close proximity, marangoni effect reduces the Oswald's ripening time..
The stability of the emulsion droplets in our studies differed depending on the type of solvent used and the droplet size.
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According to your description ,in sessile droplet evaporation, micro size particle can effects on intensity of marangoni flow ??
Micro size particle can reduce the velocity of marangoni flow in compared with nano scale particle in the sessile droplet evaporation?
Thanks Mr. Anoop R Markande but you don't understand my question.
i know that there is marangoni flow inside the sessile droplet during evaporation. I have 2 sample :
1- base fluid + 0.5 % wt nanoparticle ( NP size : 20-30 nm ) without any surfacatant ( just sonication is used for 1 hr )
2 - Base fluid +0.1 %wt Micro scale particle ( particle size : 20 Micrometer ) without any surfactant ( just sonication is used for 1 hr)
Question 1 : in constant volume of sessile droplet and other condition ( surface, temperature , humidity and .... ) , in which sample, marangoni flow intensity ( velocity of flow ) is higher ?
Question 2 : particle size can effect on marangoni flow ? Big particle can reduce the velocity of marangoni flow inside the droplet or not ??
The size of NP doesn't matter if the interphase is stable. But usually a stabilizing agent is required in larger volume droplet. After evaporation I think the M.flow should be higher in larger droplets as the smaller ones become more and more unstable..due to the packing and oswalds ripening. But all that I can say with respect to in presence of a stabilizing agent...
Can you tell me the stability of this NP? at a particular size?
Yes.. there is a possibality that bigger particle reducing the M flow in evaporation conditions...
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