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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Languages: English
Types: Doctoral thesis
Subjects: QC, QD
We have developed simplified microfluidic droplet generators and employed them\ud to fabricate anisotropic polymer particles and capsules in the size range of 100–500 μm.\ud We used cheap and generally available materials and equipment to design and assemble\ud microfluidic devices. All our devices were made of standard wall borosilicate capillaries\ud (OD 1.0mm, ID 0.58mm), steel dispensing needles without bevel (30 G, 32 G),\ud microscopy glass slides, fast-curing epoxy glue (Araldite-80805) and diamond scribe to\ud process the glass. We designed four different geometries for each device, which can be\ud separated for two groups: single and double droplet generators. The performance of the\ud devices was validated using computational fluid dynamics and laboratory experiments.\ud First of all, we tried to fabricate intricate single emulsion droplets and then moved\ud on to double emulsion droplets. The range of the fabricated particles and capsules\ud includes anisotropically-shaped amphiphilic polymer “microbuckets”, biphasic\ud particles, capsules with various fillers and stimuli responsive polymer vesicles. To\ud produce such objects we employed different functional monomers, for instance\ud “clickable” glycidyl methacrylate or hydrophilic 2-hydroxyethyl methacrylate. We also\ud utilized several chemical and physical phenomena such as internal phase separation,\ud wettability or polymer chain cross-linking to tune the properties of the synthesized\ud particles. We investigated properties of the above mentioned particles and capsules. For\ud example, “microbuckets” which are hydrophilic at the exterior surface, but hydrophobic\ud inside the cavity, were able to withdraw oil droplets from an aqueous phase and “arrest”\ud them inside the cavity.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • Subsequent removal of a porogen results in a porous structure....................................114 Figure IV-12. Optical and scanning electron microscopy images of solid/macroporous Janus particles. (A) The dark part is porous while light is solid. (B) SEM image clearly defines the biphasic morphology of the particle. (C) Janus triplet as the result of softsoft interaction between the particles. (D) SEM characterisation of the porosity. (A-C) scale bars are 400 µm, while (D) is 2 µm. ....................................................................115 Figure IV-13. Solid/mesoporous Janus particles. (A) Monodisperse solid/mesoporous particles where the darker segment is porous. (B) Closer look at the particles reveals solid segment which is transparent. (C) SEM image of the porous part illustrates a thin layer of “skin9”and porous structure under it. (D) SEM characterisation of the porosity.
    • (B) Monodisperse capsules space-filled with a blue pigment. All scale bars are 500μm.
    • .......................................................................................................................................132 Figure V-9. Colour changing suspension encapsulated in the polymeric shell. (A) The “chameleonic” capsules at room temperature. (B) Monodisperse capsules after temperature increase to 40 °C. Subsequent cooling reverses the effect by making the capsules blue. All scale bars are 500μm. ......................................................................133 Figure V-10. (A) Magnetic capsules in the vial without applied magnetic field. (B) External field created by neodymium magnet attracted encapsulated ferrofluid and forced capsules to move. ...............................................................................................134 Figure VI-1. A control over the size and shell thickness of double emulsion droplets.
    • Soc., Trans.1907, 91, 307-314.
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  • No similar publications.

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