Title :

Microfluidic emulsification: Process and formulation variables effects in flow behavior pattern on a flow-focusing device

Author(s) :

Ontiveros, Jesus [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Company, Roberto [Auteur]
Ortega Vaz, Mike [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Rataj, Véronique [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Journal title :

Colloids and Surfaces A. Physicochemical and Engineering Aspects

Abbreviated title :

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Volume number :

601

Pages :

125038

Publication date :

2020-09

ISSN :

09277757

English abstract : [en]

Formulation and process variables in surfactant/oil/water (SOW) systems can strongly modify the water/oil interfacial tension leading to different behaviors. Pre-equilibration time of the SDS/toluene/1-butanol/NaCl(aq) ...
Show more >Formulation and process variables in surfactant/oil/water (SOW) systems can strongly modify the water/oil interfacial tension leading to different behaviors. Pre-equilibration time of the SDS/toluene/1-butanol/NaCl(aq) system was studied as a process variable and the flow regimes were described at different continuous and dispersed flow rates through a flow focusing geometry. Salinity and oil nature for the SDS/n-alkane/alcohol/NaCl(aq) equilibrated system were studied as formulation variables at fixed dispersed flow rates, changing the continuous flow rate and the formulation variable in order to get O/W or W/O emulsions in hydrophilic and hydrophobic chips, respectively. Pre-equilibration time modifies the flow regimes depending on the differences observed in the interfacial tension at t = 0 and t = 24 h of equilibration. Under very hydrophilic conditions, when γt=24 > γt=0, the entire droplet area is slightly higher for equilibrated systems. At WIII condition, when γt=0 >> γt=24, droplets are formed only in jetting regime for not equilibrated systems. For salinity scan, monodispersed oil droplets were obtained at low salinities, S = 0−0.25 % and in the oil scan, water droplets were obtained when using cyclohexane and cyclohexane-hexane mixtures. In both cases, flow regimes are reported into the formulation maps, using the Hydrophilic Lipophilic Deviation as formulation variable (HLD vs flow rate ratio). Droplet size was fitted into the same equation (), and it is noteworthy that the interfacial tension in CaC is lower than in most of reported works using flow-focusing geometries and both emulsions (W/O and O/W) were obtained with the same surfactant.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Colloïdes catalyse oxydation (CÏSCO)

Submission date :

2021-12-08T09:53:00Z
2022-03-01T15:36:23Z