Influence of dynamic interfacial tension on droplet formation during membrane emulsification

Graaf, Shenja van der; Schroën, C.G.P.H.; Sman, R.G.M. van der; Boom, R.M.

doi:10.1016/j.jcis.2004.04.033

Cited by 113 publications

(65 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A considerable amount of work has documented the effects of surfactant dynamics on the production of droplets from membranes including the relationship between dynamic interfacial tension and the size of droplets [14][15][16][17], the lag time between consecutive droplets [18], and the number of active pores. In addition to the influence of the surfactant properties, these studies revealed that the dispersed phase flux also has an important influence as it determines the degree of surfactant depletion at the interface from surface expansion.…”

Section: Introductionmentioning

confidence: 99%

“…Experiments by van der Graaf et al [14] with T-junction generators demonstrated that under low surfactant concentration, droplet formation is comparable to when surfactants are absent, indicating that droplet production is faster than surfactant adsorption in most cases. Only at high concentration of surfactants was a change in droplet production seen with smaller droplets being produced.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Droplet formation in microfluidic T-junction generators operating in the transitional regime. III. Dynamic surfactant effects

Glawdel

Ren

2012

Phys. Rev. E

View full text Add to dashboard Cite

This study extends our previous work on droplet generation in microfluidic T-junction generators to include dynamic interfacial tension effects created by the presence of surfactants. In Paper I [T. Glawdel, C. Elbuken, and C. L. Ren, Phys. Rev. E 85, 016322 (2012)], we presented experimental findings regarding the formation process in the squeezing-to-transition regime, and in Paper II [T. Glawdel, C. Elbuken, and C. L. Ren, Phys. Rev. E 85, 016323 (2012)] we developed a theoretical model that describes the performance of T-junction generators without surfactants. Here we study dynamic interfacial tension effects for two surfactants, one with a small molecular weight that adsorbs quickly, and the other with a large molecular weight that adsorbs slowly. Using the force balance developed in Paper II we extract the dynamic interfacial tension from high speed videos obtained during experiments. We then develop a theoretical model to predict the dynamic interfacial tension in microfluidic T-junction generators as a function of the surfactant properties, flow conditions, and generator design. This model is then incorporated into the overall model for generator performance to effectively predict the size of droplets produced when surfactants are present.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Droplet formation in microfluidic T-junction generators operating in the transitional regime. III. Dynamic surfactant effects

Glawdel

Ren

2012

Phys. Rev. E

View full text Add to dashboard Cite

show abstract

“…The effect of kinetics of adsorption of surfactant at oil-aqueous interface during DME on the droplet size has been investigated by Schröder et al (1998), Van der Graaf et al (2004) (Nakashima et al, 1993). The use of zwitterionic surfactants must also be avoided, even when they carry a net negative charge (Surh et al, 2008).…”

Section: Effect Of Surfactantmentioning

confidence: 99%

“…The effect of kinetics of adsorption of surfactant at oil-aqueous interface during DME on the droplet size has been investigated by Schröder et al (1998), Van der Graaf et al (2004), and Rayner et al (2005). The faster the surfactant molecules adsorb to the newly formed interface, the smaller the droplet size becomes.…”

Section: Effect Of Surfactantmentioning

confidence: 99%

Structured microparticles with tailored properties produced by membrane emulsification

Vladisavljević

2015

Advances in Colloid and Interface Science

View full text Add to dashboard Cite

This paper provides an overview of membrane emulsification routes for fabrication of structured microparticles with tailored properties for specific applications. Direct (bottom-up) and premix (top-down) membrane emulsification processes are discussed including operational, formulation and membrane factors that control the droplet size and droplet generation regimes. A special emphasis was put on different methods of controlled shear generation on membrane surface, such as cross flow on the membrane surface, swirl flow, forward and backward flow pulsations in the continuous phase and membrane oscillations and rotations. Droplets produced by membrane emulsification can be used for synthesis of particles with versatile morphology (solid and hollow, matrix and core/shell, spherical and non-spherical, porous and coherent, composite and homogeneous), which can be surface functionalised and coated or loaded with macromolecules, nanoparticles, quantum dots, drugs, phase change materials and high molecular weight gases to achieve controlled/targeted drug release and impart special optical, chemical, electrical, acoustic, thermal and magnetic properties. The template emulsions including metal-in-oil, solid-in-oil-in-water, oil-in-oil, multilayer, and Pickering emulsions can be produced with high encapsulation efficiency of encapsulated materials and narrow size distribution and transformed into structured particles using a variety of different processes, such as polymerisation (suspension, mini-emulsion, interfacial and in-situ), ionic gelation, chemical crosslinking, melt solidification, internal phase separation, layer-by-layer electrostatic deposition, particle self-assembly, complex coacervation, spray drying, sol-gel processing, and molecular imprinting. Particles fabricated from droplets produced by membrane emulsification include nanoclusters, colloidosomes, carbon aerogel particles, nanoshells, polymeric (molecularly imprinted, hypercrosslinked, Janus and core/shell) particles, solder metal powders and inorganic particles. Membrane 2 emulsification devices operate under constant temperature due to low shear rates on the membrane surface, which range from (1−10) × 10 3 s −1 in a direct process to (1−10) × 10 4 s −1 in a premix process.Keywords: Membrane Emulsification; Polymeric microsphere; Microgel; Janus Particle; Core/Shell Particle, Colloidosome. Membrane emulsificationMembrane emulsification (ME) involves preparation of emulsions by pressing a pure dispersed phase or pre-emulsified mixture of the dispersed and continuous phase through a microporous membrane under controlled injection rate and shear conditions. In direct membrane emulsification (DME), one liquid (a dispersed phase) is injected through a microporous membrane into another immiscible liquid (the continuous phase) (Nakashima et al., 1991;, which leads to the formation of droplets at the membrane/continuous phase interface ( Figure 1a). In premix membrane emulsification (PME) (Figure 1b), a pre-emulsion is pressed through the membrane (...

show abstract

“…The effect of kinetics of adsorption of surfactant at oil-aqueous interface on the droplet size has been investigated by several groups (Schröder et al, 1998;Van der Graaf et al, 2004;Rayner et al, 2005). As a rule, the faster the surfactant molecules adsorb to the newly formed interface, the smaller the droplet size of the emulsion becomes.…”

Section: Influence Of Surfactantmentioning

confidence: 99%

High-pressure Homogenizer Design

Rayner¹

2015

Engineering Aspects of Food Emulsification and Homogenization

View full text Add to dashboard Cite

Influence of dynamic interfacial tension on droplet formation during membrane emulsification

Cited by 113 publications

References 16 publications

Droplet formation in microfluidic T-junction generators operating in the transitional regime. III. Dynamic surfactant effects

Droplet formation in microfluidic T-junction generators operating in the transitional regime. III. Dynamic surfactant effects

Structured microparticles with tailored properties produced by membrane emulsification

High-pressure Homogenizer Design

Contact Info

Product

Resources

About