The Role of Excess Attractive Particles in the Elasticity of High Internal Phase Pickering Emulsions

Soft Matter ◽  
2021 ◽  
Author(s):  
Junsu Chae ◽  
Siyoung Choi ◽  
KyuHan Kim
Keyword(s):  
Volume Fraction ◽  
Dispersed Phase ◽  
Pickering Emulsions ◽  
High Internal Phase Emulsion ◽  
Internal Phase

A high internal phase emulsion (HIPE), which has a volume fraction of dispersed phase of over 74%, shows a solid like property because of concentrated polyhedral droplets. Although many studies...

scholarly journals In-Situ Continuous Monitoring of the Viscosity of Surfactant-Stabilized and Nanoparticles-Stabilized Pickering Emulsions

2019 ◽  
Vol 9 (19) ◽  
pp. 4044 ◽  
Author(s):  
Upinder Bains ◽  
Rajinder Pal
Keyword(s):  
Volume Fraction ◽  
Dispersed Phase ◽  
Pickering Emulsions ◽  
Volume Fractions ◽  
Shear Thinning Fluids ◽  
Oil In Water ◽  
Droplet Sizes ◽  
High Concentrations ◽  
The Stability

An in-situ method of measuring the viscosity of unstable and stable emulsions on a continuous basis under agitation conditions was developed and utilized to investigate the viscous behaviour of surfactant-stabilized and nanoparticles-stabilized oil-in-water (O/W) emulsions at different volume fractions of the dispersed phase (oil). The stability characteristics (droplet size and phase-separation) of emulsions under quiescent conditions were also determined with the aging of emulsions. Emulsions are Newtonian at low volume fractions of the dispersed phase. At high concentrations of the dispersed phase, emulsions behave as non-Newtonian shear-thinning fluids. The nanoparticles-stabilized (Pickering) emulsions are unstable in comparison with the surfactant-stabilized emulsions. The droplet sizes of Pickering emulsions increase rapidly with aging, whereas the droplet sizes of surfactant-stabilized remain nearly the same over a period of 24 h. However, Pickering emulsions are much more viscous than the surfactant-stabilized emulsions when comparison is made at the same volume fraction of the dispersed phase.

Emulsions and foams

Surfactants ◽  
2019 ◽  
pp. 350-399
Author(s):  
Bob Aveyard
Keyword(s):  
Bubble Size ◽  
Ostwald Ripening ◽  
Volume Fraction ◽  
Laplace Pressure ◽  
Dispersed Phase ◽  
Surfactant Monolayers ◽  
Internal Phase ◽  
Oil In Water ◽  
Small Bubbles ◽  
Oil Type

Methods of formation of emulsions and foams are given; both types of system are stabilized by surfactants. Emulsions can be oil-in-water or water-in-oil type and the preferred type is discussed in terms of the hydrophile–lipophile balance of the system, which ultimately depends on the preferred curvature of close-packed surfactant monolayers at droplet interfaces. Droplet and bubble size distributions in emulsions and foams respectively, evolve with time through Ostwald ripening (bubble disproportionation in foams); larger drops (bubbles) grow at the expense of smaller ones since the Laplace pressure in small bubbles/drops exceeds that in large ones. Creaming occurs in emulsions (if drops are less dense than the medium) and in foams so the volume fraction of dispersed phase, ϕ‎, changes with height. At high ϕ‎ both emulsions and foams assume polyhedral structures giving high internal phase emulsions and ‘dry’ foams, respectively. Methods of breaking unwanted emulsions and foams are described.

scholarly journals Effect of curing bath conditions on the morphology and structure of poly(high internal phase emulsion) fibers

2020 ◽  
Vol 138 (11) ◽  
pp. 50019
Author(s):  
Xuehui Gong ◽  
Boran Zhao ◽  
Ica Manas‐Zloczower ◽  
Donald L. Feke
Keyword(s):  
High Internal Phase Emulsion ◽  
Internal Phase ◽  
Morphology And Structure

Green Tea Polyphenol-Stabilized Gel-Like High Internal Phase Pickering Emulsions

2021 ◽  
Vol 9 (11) ◽  
pp. 4076-4090
Author(s):  
Qiulan Tong ◽  
Zeng Yi ◽  
Yaqin Ran ◽  
Xiangyu Chen ◽  
Guangcan Chen ◽  
...  
Keyword(s):  
Green Tea ◽  
Pickering Emulsions ◽  
Tea Polyphenol ◽  
Internal Phase ◽  
Green Tea Polyphenol

A stable high internal phase emulsion fabricated with OSA-modified starch: an improvement in β-carotene stability and bioaccessibility

2019 ◽  
Vol 10 (9) ◽  
pp. 5446-5460 ◽  
Author(s):  
Chi Yan ◽  
David Julian McClements ◽  
Liqiang Zou ◽  
Wei Liu
Keyword(s):  
Simple Shear ◽  
Succinic Anhydride ◽  
Modified Starch ◽  
High Internal Phase Emulsion ◽  
Shear Dispersion ◽  
Internal Phase ◽  
Octenyl Succinic Anhydride ◽  
Β Carotene

A high internal phase emulsion (HIPE) was firstly fabricated with octenyl succinic anhydride modified starch through simple shear dispersion.

scholarly journals Microstructure and magnetic properties of Nd-Fe-B-(Re, Ti) alloys

Nukleonika ◽  
2015 ◽  
Vol 60 (1) ◽  
pp. 29-33
Author(s):  
Mariusz Hasiak
Keyword(s):  
Magnetic Properties ◽  
Phase Composition ◽  
Volume Fraction ◽  
Magnetic Characteristics ◽  
Ti Alloys ◽  
Wide Range ◽  
Magnetically Hard ◽  
Ti Addition ◽  
Microstructure And Magnetic Properties

Abstract The microstructure and magnetic properties of nanocomposite hard magnetic Nd-Fe-B-(Re, Ti) materials with different Nd and Fe contents are studied. The role of Re and Ti addition in phase composition and volume fraction of the Nd-Fe-B phase is determined. All samples are annealed at the same temperature of 993 K for 10 min. Mössbauer spectroscopy shows that the addition of 4 at.% of Re to the Nd8Fe78B14 alloy leads to creation of an ineligible amount of the magnetically hard Nd2Fe14B phase. Moreover, the microstructure and magnetic characteristics recorded in a wide range of temperatures for the Nd8Fe79−xB13Mx (x = 4; M = Re or Ti) alloys are also analyzed.

Water and Oil Dual-Absorption Composite Resins Prepared from High Internal Phase Emulsion

2014 ◽  
Vol 884-885 ◽  
pp. 186-189 ◽  
Author(s):  
San Zhu ◽  
Xiao Gang Luo ◽  
Li Bin Ma ◽  
Ya Nan Xue ◽  
Ning Cai ◽  
...  
Keyword(s):  
Composite Resins ◽  
Butyl Methacrylate ◽  
Oil Uptake ◽  
Absorption Properties ◽  
High Internal Phase Emulsion ◽  
Saturated Water ◽  
Internal Phase ◽  
External Phase ◽  
Potential Applications ◽  
Scanning Electron

Novel composite resins with dual absorption properties of water and oil are prepared by the polymerization of high internal phase emulsion (HIPEs) with n-butyl methacrylate as the external phase monomer and acrylamide as the internal phase monomer. The subsequent polymerization leads to the formation of water and oil dual-absorption composite resins. The morphology of porous structure and microcosmic phase separation after water/oil uptake is observed by scanning electron microscopy (SEM). The water and oil absorbency strongly depend on composition. The composites with saturated water uptake could absorb the chloroform again but cant absorb water if saturated with chloroform first. And the resins exhibit great reusability, keeping almost constant absorbency. The present methodology could be a potential approach to obtain amphiphilic composites, which possess potential applications in the bioengineering, medical and industrial fields.

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