Electric field assisted transport of dielectric droplets dispersed in aqueous solutions of ionic surfactants

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F18%3A43915897" target="_blank" >RIV/60461373:22340/18:43915897 - isvavai.cz</a>

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/full/10.1002/elps.201800176" target="_blank" >https://onlinelibrary.wiley.com/doi/full/10.1002/elps.201800176</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/elps.201800176" target="_blank" >10.1002/elps.201800176</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electric field assisted transport of dielectric droplets dispersed in aqueous solutions of ionic surfactants

Popis výsledku v původním jazyce

Motion of liquid droplets with a surface electric charge can be efficiently controlled by dc electric field. Here, we show that the surface of a dielectric kerosene droplet can be charged by the addition of ionic surfactants to a surrounding aqueous electrolyte. The direction of droplet motion is determined by the polarity of the surfactant charge and the orientation of the imposed electric field. We have found that the effective electrophoretic mobility of dielectric droplets in a confined channel is directly proportional to the logarithm of the surfactant concentration even for values significantly exceeding critical micelle concentration (CMC). We attribute this finding not only to adsorption of ionic surfactants to the surface of dielectric droplets but also to the weakening of electro-osmosis at channel walls due to the increase of ionic strength in the aqueous phase. Our findings can be exploited in microfluidic reactors and separators for on request dosing, sampling, and separation of dielectric fluids.

Název v anglickém jazyce

Electric field assisted transport of dielectric droplets dispersed in aqueous solutions of ionic surfactants

Popis výsledku anglicky

Motion of liquid droplets with a surface electric charge can be efficiently controlled by dc electric field. Here, we show that the surface of a dielectric kerosene droplet can be charged by the addition of ionic surfactants to a surrounding aqueous electrolyte. The direction of droplet motion is determined by the polarity of the surfactant charge and the orientation of the imposed electric field. We have found that the effective electrophoretic mobility of dielectric droplets in a confined channel is directly proportional to the logarithm of the surfactant concentration even for values significantly exceeding critical micelle concentration (CMC). We attribute this finding not only to adsorption of ionic surfactants to the surface of dielectric droplets but also to the weakening of electro-osmosis at channel walls due to the increase of ionic strength in the aqueous phase. Our findings can be exploited in microfluidic reactors and separators for on request dosing, sampling, and separation of dielectric fluids.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

Projekt

<a href="/cs/project/GA17-09914S" target="_blank" >GA17-09914S: Reakčně-transportní jevy v integrovaných mikrofluidních bioreaktorech-separátorech pracujících s vodnými dvoufázovými systémy</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Electrophoresis

ISSN

0173-0835

e-ISSN

—

Svazek periodika

39

Číslo periodika v rámci svazku

23

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

2997-3005

Kód UT WoS článku

000451894000007

EID výsledku v databázi Scopus

2-s2.0-85053453057