Effect of Dynamic Interfacial Tension on the Emulsification Process Using Microporous, Ceramic Membranes

Schröder, Volker; Behrend, Olaf; Schubert, Helmar

doi:10.1006/jcis.1998.5429

Cited by 270 publications

(214 citation statements)

References 3 publications

Supporting

Mentioning

203

Contrasting

Unclassified

Order By: Relevance

“…The relative magnitude of these forces change as the droplet increases in size and has been plotted in the literature [1,12,15]. It has been shown that for micron scale droplets the inertia and buoyancy forces are approximately 9 and 6 orders of magnitude smaller, respectively than the drag and interfacial tension forces and therefore, can be neglected in the force balance model.…”

Section: Shear Induced Droplet Formation According To the Force Balanmentioning

confidence: 99%

“…Previous studies have shown that the droplet size decreases as the wall shear stress increases [5,7,19]. One popular explanation of this phenomenon is that the flowing continuous phase creates the drag force that pulls the droplets away from the pore mouths after reaching a certain size [15]. According to this approach, the point at which the droplet detaches occurs when the sum of these forces acting on it equals zero, yielding the following equation by solving for the drop diameter:…”

Section: Shear Induced Droplet Formation According To the Force Balanmentioning

confidence: 99%

“…The size of droplets when they detach from the membrane or micro-channel depends on the above mentioned process parameters, which have been evaluated by associating them to forces which act on the system [1,5,[15][16][17][18]. The relative magnitude of these forces change as the droplet increases in size and has been plotted in the literature [1,12,15].…”

Section: Shear Induced Droplet Formation According To the Force Balanmentioning

confidence: 99%

See 2 more Smart Citations

The impact of mass transfer and interfacial expansion rate on droplet size in membrane emulsification processes

Rayner

Trägårdh

2005

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

Section: Shear Induced Droplet Formation According To the Force Balanmentioning

confidence: 99%

Section: Shear Induced Droplet Formation According To the Force Balanmentioning

confidence: 99%

Section: Shear Induced Droplet Formation According To the Force Balanmentioning

confidence: 99%

See 1 more Smart Citation

The impact of mass transfer and interfacial expansion rate on droplet size in membrane emulsification processes

Rayner

Trägårdh

2005

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

“…When a continuous phase contains surfactant molecules, they adsorb to a freshly generated oil-water interface, dynamically lowering interfacial tension. Dynamic interfacial tension at a vegetable oil-water (2.0 wt% Tween 20) interface was measured by Schröder et al (1998) using the bursting membrane method. Dynamic interfacial tension sharply decreased within 2 s, ultimately reaching an almost constant value.…”

Section: µ µ µ µMmentioning

confidence: 99%

CFD analysis of microchannel emulsification: Droplet generation process and size effect of asymmetric straight flow-through microchannels

Kobayashi

Vladisavljević

Uemura

et al. 2011

Chemical Engineering Science

View full text Add to dashboard Cite

“…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%

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

Effect of Dynamic Interfacial Tension on the Emulsification Process Using Microporous, Ceramic Membranes

Cited by 270 publications

References 3 publications

The impact of mass transfer and interfacial expansion rate on droplet size in membrane emulsification processes

The impact of mass transfer and interfacial expansion rate on droplet size in membrane emulsification processes

CFD analysis of microchannel emulsification: Droplet generation process and size effect of asymmetric straight flow-through microchannels

Structured microparticles with tailored properties produced by membrane emulsification

Contact Info

Product

Resources

About