Pickering emulsions stabilized by shape-controlled silica microrods

Lou, Fangli; Ye, Lishaya; Kong, Miqiu; Yang, Qi; Li, Guangxian; Huang, Yajiang

doi:10.1039/c6ra00360e

Cited by 42 publications

(37 citation statements)

References 36 publications

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“…The Pt-containing Janus catalyst not only showed excellent interfacial activity for stabilizing Pickering emulsions, but also enhanced reaction efficiency in the biphasic nitroarene hydrogenation reaction. 27 With the development of new synthesis techniques, various non-spherical particles have now been produced and tested as colloidal surfactants, including particles shaped as onedimensional fibers, 46,47 ellipsoids, 34 rods, [48][49][50][51] two-dimensional nanosheets 28,52 or plates. 4 Huang et al prepared silica microrods with aspect ratios (AR, ratio of long to short axis) varying from 1 to 16 ( Figure 2f) to stabilize hexadecane/water emulsions and found that the microrods with larger ARs exhibited superior stabilization efficiency, attributing this to their higher steric hindrance, interface adsorption energy and stronger capillary forces.…”

Section: Particle Geometrymentioning

confidence: 99%

Recent developments in catalysis with Pickering Emulsions

et al. 2021

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Section: Particle Geometrymentioning

confidence: 99%

Recent developments in catalysis with Pickering Emulsions

et al. 2021

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“…Finally we emphasize that the segregation behavior predicted by our simulations can in principle be verified in experiments using smectic shells of molecular crystals [49][50][51][52][53][54][55][56][57][58] or Pickering emulsion droplets covered with rod-like colloids [59][60][61][62][63][64] . Another option are layers of silica rods which are recently studied under various constraints 65,66 , aspherical surfactants 67 or ellipsoidal colloids bound to curved fluid-fluid interfaces 68 .…”

Section: Discussionmentioning

confidence: 76%

Length segregation in mixtures of spherocylinders induced by imposed topological defects

Allahyarov

Löwen

2018

Soft Matter

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We explore length segregation in binary mixtures of spherocylinders of lengths L 1 and L 2 with the same diameter D which are tangentially confined on a spherical surface of radius R. The orientation of spherocylinders is constrained along an externally imposed direction field on the sphere which is either along the longitude or the latitude lines of the sphere. In both situations, integer orientational defects at the poles are imposed. We show that these topological defects induce a complex segregation picture also depending on the length ratio factor γ=L 2 /L 1 and the total packing fraction η of the spherocylinders. When the binary mixture is aligned along longitudinal lines of the sphere, shorter rods tend to accumulate at the topological defects of the polar caps whereas longer rods occupy central equatorial area of the spherical surface. In the reverse case of latitude ordering, a state can emerge where longer rods are predominantly both in the cap and in the equatorial areas and shorter rods are localized in between. As a reference situation, we consider a defect-free situation in the flat plane and do not find any length segregation there at similar γ and η, hence the segregation is purely induced by the imposed topological defects. It is also revealed that the shorter rods at γ=4 and η ≥0.5 act as obstacles to the rotational relaxation of the longer rods when all orientational constraints are released.

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“…Long term stabilization of emulsions in cases where the coverage C is low has been reported in several cases for both o/w and w/o emulsions. 61 – 63 More recently, 64 o/w emulsions exhibiting low surface coverage of rod-shaped cellulose particles has been reported. Depending on the rod length, C values between 44% and 84% were found to be required for emulsion stabilization.…”

Section: Resultsmentioning

confidence: 99%