Temperature induced formation of particle coated non-spherical droplets

Janus and patchy particles have designed heterogeneous surfaces that consist of two or several patches with different materials properties. These particles are emerging as building blocks for a new class of soft matter and functional materials. Here we introduce a route for forming heterogeneous capsules by producing highly ordered jammed colloidal shells of various shapes with domains of controlled size and composition. These structures combine the functionalities offered by Janus or patchy particles, and those given by permeable shells such as colloidosomes. The simple assembly route involves the synergetic action of electro-hydrodynamic flow and electro-coalescence. We demonstrate that the method is robust and straightforwardly extendable to production of multi-patchy capsules. This forms a starting point for producing patchy colloidosomes with domains of anisotropic chemical surface properties, permeability or mixed liquid–solid phase domains, which could be exploited to produce functional emulsions, light and hollow supra-colloidosome structures, or scaffolds.

show abstract

“…It has been shown previously that non-spherical capsules can be produced with 100-nm-sized particles3740.…”

Section: Discussionmentioning

confidence: 99%

Electroformation of Janus and patchy capsules

et al. 2014

View full text Add to dashboard Cite

show abstract

“…At the volume fraction where the emulsions started to break down, the drops increased in size, with some forming arrested shapes, as shown in Figure 7 [111]. Tan et al [112] showed that arrested coalescence in emulsions can be triggered by Ostwald ripening of nanoparticles coating the drop surfaces. They studied paraffin-in-water emulsions coated with freshly precipitated Mg(OH) 2 nanoparticles.…”

Section: Coalescing Dropsmentioning

confidence: 99%

“…They studied paraffin-in-water emulsions coated with freshly precipitated Mg(OH) 2 nanoparticles. Emulsions stored at temperatures higher than 80 °C destabilised [112]. A fraction of the drop population coalesced into non-spherical drop shapes.…”

Section: Coalescing Dropsmentioning

confidence: 99%

Controlling Pickering Emulsion Destabilisation: A Route to Fabricating New Materials by Phase Inversion

Whitby

Wanless

2016

Materials

View full text Add to dashboard Cite

The aim of this paper is to review the key findings about how particle-stabilised (or Pickering) emulsions respond to stress and break down. Over the last ten years, new insights have been gained into how particles attached to droplet (and bubble) surfaces alter the destabilisation mechanisms in emulsions. The conditions under which chemical demulsifiers displace, or detach, particles from the interface were established. Mass transfer between drops and the continuous phase was shown to disrupt the layers of particles attached to drop surfaces. The criteria for causing coalescence by applying physical stress (shear or compression) to Pickering emulsions were characterised. These findings are being used to design the structures of materials formed by breaking Pickering emulsions.

show abstract

“…Inspired by literatures mentioned above and our previous work [21,37,39], in this paper, a systematic evaluation of hydrothermal temperature and time on particle morphology, crystallinity and colloid stability of hydrothermal synthesized colloidal HA nanorods based on experiments was conducted. A proposed explanation of these effects was also discussed.…”

Section: Introductionmentioning

confidence: 99%