Size and strength distributions of melamine-formaldehyde microcapsules prepared by membrane emulsification

Pan, Xuemiao; York, David; Preece, Jon A.; Zhang, Zhibing

doi:10.1016/j.powtec.2011.12.041

Cited by 45 publications

(40 citation statements)

References 26 publications

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“…PECVD can also be used to decrease the pore size, while keeping the circular pore shape (Schadler and Windhab, 2006). Nickel membrane can also be made hydrophilic by treatment with polyalkyleneoxide modified heptamethyltrisiloxane (Pan et al, 2012). Silicon nitride membranes can be hydrophobised by coating their surface with alkyltrichlorosilanes using chemical vapour deposition (Geerken et al, 2007).…”

Section: Surface Modification Of Microengineered Membranesmentioning

confidence: 99%

“…Liquid-core/polymer-shell capsules were produced by combining ME with one-stage suspension polymerisation Ma et al, 2003c), two-stage suspension polymerisation , interfacial polymerisation (Chu et al, 2003) or in-situ polymerisation (Pan et al, 2012;Liu et al, 2011). The prepared particles were investigated as potential candidates for encapsulation of phase change materials (Chaiyasat et al, 2009;Rahman et al, 2012) and self-healing agents (Liu et al, 2011).…”

Section: Liquid-core/polymer-shell and Hollow Capsulesmentioning

confidence: 99%

“…Pan et al (2012) prepared melamine-formaldehyde (MA-FA) capsules with a shell thickness of ∼400 nm by emulsifying oil-based industrial precursor in an aqueous solution of monomers (FA and MA) in the Dispersion Cell using a microengineered nickel membrane, followed by ISP at 65°C (Table 10B and 19b). The prepared capsules were more uniform that the capsules prepared using the same emulsion formulation in a high shear mixer.…”

Section: In-situ Polymerisationmentioning

confidence: 99%

“…Figure 19. Preparation of liquid-core-polymer-shell particles by membrane emulsification followed by emulsification on the surface of the droplets: (a) interfacial polycondensation (IP) (Chu et al, 2002) and (b) in-situ polymerisation (ISP) (Pan et al, 2012). emulsification: (a) Citrem-chitosan-alginate three-layer emulsion prepared by PME and LbL electrostatic deposition (Gudipati et al, 2010); (b) Tween 20-SDS-chitosan two-layer emulsion with cationic droplets prepared by PME, surfactant displacement and LbL electrostatic deposition (Vladisavljević and McClements, 2010); (c) BLG-alginate two-layer emulsion with anionic droplets prepared by PME and LbL electrostatic deposition with stepwise change in pH after mixing BLG-stabilized emulsion with alginate (Li and McClements, 2014).…”

Section: Pyrex Glass Wt%mentioning

confidence: 99%

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Structured microparticles with tailored properties produced by membrane emulsification

Vladisavljević

2015

Advances in Colloid and Interface Science

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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 (...

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Section: Surface Modification Of Microengineered Membranesmentioning

confidence: 99%

Section: Liquid-core/polymer-shell and Hollow Capsulesmentioning

confidence: 99%

Section: In-situ Polymerisationmentioning

confidence: 99%

Section: Pyrex Glass Wt%mentioning

confidence: 99%

See 2 more Smart Citations

Structured microparticles with tailored properties produced by membrane emulsification

Vladisavljević

2015

Advances in Colloid and Interface Science

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“…The emulsion droplets with narrower size distributions were generated by pushing the emulsion (generated by homogenization at 400 rpm as described in the previous section) through the membrane system (Micro-pore Technologies Ltd., UK., for details see [10]) into a 0.1 wt % PVA and 5 wt% NaCl aqueous solution, using an agitation speed from 880 to 1210 rpm and a dispersed phase flux from 1.6×10 -5 m s -1 to 3.1×10 -5 m s -1 at 25 ± 1 °C.…”

Section: Preparation Of Emulsionmentioning

confidence: 99%

Preparation and characterisation of user-friendly PMMA microcapsules for consumer care

Pan¹,

Mercadé‐Prieto²,

York³

et al. 2013

AIP Conference Proceedings

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Membranes for Microfluidic Applications

Vladisavljević

Kobayashi

Nakajima

2013

Encyclopedia of Membrane Science and Technology

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This article provides an overview of major membrane microfluidic techniques for the production and modification of liquid‐liquid and gas‐liquid dispersions and the most common membranes used in these processes. The main emphasis is on Shirasu porous glass (SPG) membrane, microengineered membranes, and single‐crystal silicon microchannel (MC) plates. For each membrane type, fabrication process and microfluidic applications are discussed. SPG membrane is an interconnected‐type membrane fabricated by spinodal decomposition, which has been widely used in membrane emulsification (ME) and membrane micromixing/nanoprecipitation processes leading to the generation of emulsions, micro‐ and nanobubbles, and micro‐ and nanoparticles. Typical microengineered membranes used in microfluidic applications are silicon nitride microsieves fabricated by photolithography and reactive ion etching, nickel membranes fabricated by UV‐LIGA process, and stainless steel membranes with laser‐drilled pores. Microengineered membranes are used in stirred cell, cross‐flow, and pulsating cross‐flow ME systems. In order to prevent damage to shear‐sensitive materials in the product stream, a shear stress on the downstream side of the membrane can be provided using oscillating (vibrating) or spinning (rotating) membrane. MC plates are microchips with 3D architecture consisting of an array of horizontal microgrooves or vertical straight‐through channels integrating with other features such as terrace lines, steps, and cross‐flow channels. They are usually fabricated in single‐crystal silicon by photolithography and anisotropic wet etching or deep reactive ion etching.

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Size and strength distributions of melamine-formaldehyde microcapsules prepared by membrane emulsification

Cited by 45 publications

References 26 publications

Structured microparticles with tailored properties produced by membrane emulsification

Structured microparticles with tailored properties produced by membrane emulsification

Preparation and characterisation of user-friendly PMMA microcapsules for consumer care

Membranes for Microfluidic Applications

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