Production of Porous Silica Microparticles by Membrane Emulsification

Dragosavac, Marijana M.; Vladisavljević, Goran T.; Holdich, Richard; Stillwell, Michael T.

doi:10.1021/la202974b

Cited by 37 publications

(13 citation statements)

References 40 publications

(84 reference statements)

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“…Similar particle sizes were obtained using either a 5 µm pore size stainless steel membrane or a 0.9 µm pore size nickel membrane, without the authors suggesting a possible explanation for this phenomenon, however. Amongst other inorganic particulate materials, silica microparticles (30–70 µm, CV = 17–35%) and silica nanoparticles (70 nm, CV = 26%) have been produced with a hydrophobic metal membrane (15 µm pore size) and a hydrophobic anodic porous alumina membrane (125 nm pore size), respectively. Also, nano‐sized CaCO 3 particles (34–110 nm) were produced with a hydrophobic stainless steel membrane having pore sizes in the range of 5–90 µm …”

Section: Microstructural Design Using Membrane Emulsificationmentioning

confidence: 99%

Advances in membrane emulsification. Part A: recent developments in processing aspects and microstructural design approaches

et al. 2013

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Modern emulsion processing technology is strongly influenced by the market demands for products that are microstructure-driven and possess precisely controlled properties. Novel cost-effective processing techniques, such as membrane emulsification, have been explored and customised in the search for better control over the microstructure, and subsequently the quality of the final product. Part A of this review reports on the state of the art in membrane emulsification techniques, focusing on novel membrane materials and proof of concept experimental set-ups. Engineering advantages and limitations of a range of membrane techniques are critically discussed and linked to a variety of simple and complex structures (e.g. foams, particulates, liposomes etc.) produced specifically using those techniques.

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Section: Microstructural Design Using Membrane Emulsificationmentioning

confidence: 99%

Advances in membrane emulsification. Part A: recent developments in processing aspects and microstructural design approaches

et al. 2013

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“…Dragosavac et al (2012b) prepared silica gel particles from sodium silicate by a DME-based sol-gel process in the Dispersion Cell. First, an acidified sodium silicate solution at pH 3.5 was injected through a microengineered nickel membrane into kerosene in the presence of oilsoluble surfactant.…”

Section: Integration Of Membrane Emulsification and Sol-gel Polycondementioning

confidence: 99%

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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“…In addition, the process of drop formation which is analyzed in this work has a great significance in several fields. The typical areas are the purification extraction processes [1][2][3], metallurgic processes of gas metal arc welding [4], emulsification processes [5][6][7], jet print processes [8][9][10], the oxygenation of blood equipment design [11,12] or pool boiling bubbles spreading [13] and manufacturing liquid microcapsules by centrifugal extrusion or spray drying [14]. Besides the pendant drop, the CFD simulation of liquid drops in different conditions is treated in literature, e.g., drop flow, impact, spreading, sliding, solidification on solid surfaces [15][16][17][18][19][20][21], the process of a liquid drop formation in the coaxial capillars [22], the effects of local interfacial nonhomogeneity due to local surface active specie concentration differences [23].…”

Section: Introductionmentioning

confidence: 99%

Superficial transportation model using finite volume method

Staszak

2018

Theor. Comput. Fluid Dyn.

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The work presents a new modeling technique designed for transporting selected property while simultaneously tracking particular value of certain field variable. The model addresses the problem of transportation of superficial properties according to fluid/fluid interface evolution. Such problem arises when some superficial variable needs to be attached to the evolving interface or front defined. Several multiphase models in CFD technique lack such ability. The model proposed is illustrated by the experimental two phase system of toluene/water with surfactant specie (sodium dodecylsulfate SDS). The selected superficial property that is important to be tracked according to interface evolution is Gibbs surface excess. The computation was performed using Ansys/Fluent software with proposed models created and attached using C programming language. Keywords Interface mass transfer · Adsorption · Liquid-liquid interfaces · Fluid dynamics List of symbols

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Production of Porous Silica Microparticles by Membrane Emulsification

Cited by 37 publications

References 40 publications

Advances in membrane emulsification. Part A: recent developments in processing aspects and microstructural design approaches

Advances in membrane emulsification. Part A: recent developments in processing aspects and microstructural design approaches

Structured microparticles with tailored properties produced by membrane emulsification

Superficial transportation model using finite volume method

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