Effects of starch nanoparticles on phase inversion of Pickering emulsions

2018 ◽  
Vol 96 (5) ◽  
pp. 1089-1097 ◽  
Author(s):  
Sileola B. Ogunlaja ◽  
Rajinder Pal ◽  
Kaveh Sarikhani
Keyword(s):  
Phase Inversion ◽  
Pickering Emulsions ◽  
Starch Nanoparticles

scholarly journals Rheology and Catastrophic Phase Inversion of Emulsions in the Presence of Starch Nanoparticles

2020 ◽  
Vol 4 (4) ◽  
pp. 57
Author(s):  
Upinder Bains ◽  
Rajinder Pal
Keyword(s):  
Electrical Conductivity ◽  
Aqueous Phase ◽  
Phase Inversion ◽  
Volume Fraction ◽  
Shear Thickening ◽  
Viscosity Data ◽  
Pickering Emulsions ◽  
Sharp Drop ◽  
Starch Nanoparticles ◽  
High Concentrations

Emulsions stabilized by solid nanoparticles, referred to as Pickering emulsions, are becoming increasingly important in applications as they are free of surfactants. However, the bulk properties and stability of Pickering emulsions are far from being well understood. In this work, the rheological behavior and catastrophic phase inversion of emulsions in the presence of starch nanoparticles were studied using in-situ measurements of viscosity and electrical conductivity. The aqueous phase consisting of starch nanoparticles was added sequentially in increments of 5% vol. to the oil phase under agitation condition to prepare the emulsions. The emulsions were water-in-oil (W/O) type at low to moderate concentrations of aqueous phase. At a certain critical volume fraction of aqueous phase, catastrophic phase inversion of W/O emulsion to oil-in-water (O/W) emulsion took place accompanied a sharp jump in the electrical conductivity and a sharp drop in the emulsion viscosity. The W/O emulsions were nearly Newtonian at low concentrations of aqueous phase. At high concentrations of aqueous phase, prior to phase inversion, the W/O emulsions exhibited a shear-thickening behavior. The O/W emulsions produced after phase inversion were shear-thinning in nature. The comparison of the experimental viscosity data with the predictions of emulsion viscosity model revealed only partial coverage of droplet surfaces with nanoparticles. With the increase in the concentration of starch nanoparticles (SNPs) in the aqueous phase of the emulsions, the phase inversion of W/O emulsion to O/W emulsion was delayed to higher volume fraction of aqueous phase. Thus SNPs imparted some stability to W/O emulsions against coalescence and phase inversion.

scholarly journals Mechanical phase inversion of Pickering emulsions via metastable wetting of rough colloids

Soft Matter ◽  
2019 ◽  
Vol 15 (39) ◽  
pp. 7888-7900 ◽  
Author(s):  
Michele Zanini ◽  
Alberto Cingolani ◽  
Chiao-Peng Hsu ◽  
Miguel Ángel Fernández-Rodríguez ◽  
Giuseppe Soligno ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Phase Inversion ◽  
Mechanical Energy ◽  
Pickering Emulsions ◽  
Energy Inputs ◽  
Wetting Hysteresis

We exploit the surface-roughness-induced wetting hysteresis of individual colloids to achieve Pickering emulsions undergoing phase inversion upon mechanical energy inputs.

Characterizations of Pickering emulsions stabilized by starch nanoparticles: Influence of starch variety and particle size

2017 ◽  
Vol 234 ◽  
pp. 339-347 ◽  
Author(s):  
Shengju Ge ◽  
Liu Xiong ◽  
Man Li ◽  
Jing Liu ◽  
Jie Yang ◽  
...  
Keyword(s):  
Particle Size ◽  
Pickering Emulsions ◽  
Starch Nanoparticles

scholarly journals Engineering hybrid microgel as particulate emulsifier for reversible Pickering emulsions

2021 ◽  
Author(s):  
To Ngai ◽  
Hang Jiang ◽  
Shengwei Zhang ◽  
Guanqing Sun ◽  
Yunxing Li ◽  
...  
Keyword(s):  
Phase Inversion ◽  
The State ◽  
Pickering Emulsions ◽  
Stimuli Sensitive

Thermo-responsive microgels are unique stabilizers for stimuli-sensitive Pickering emulsions that can be switched between the state of emulsification and demulsification by changing temperature. However, directly temperature-triggering phase inversion of microgel...

Phase Inversion of Pickering Emulsions by Electrolyte for Potential Reversible Water-in-Oil Drilling Fluids

2020 ◽  
Vol 34 (2) ◽  
pp. 1317-1328 ◽  
Author(s):  
Lu Liu ◽  
Xiaolin Pu ◽  
Yan Zhou ◽  
Xiaodong Wu ◽  
Dan Luo ◽  
...  
Keyword(s):  
Phase Inversion ◽  
Drilling Fluids ◽  
Pickering Emulsions ◽  
Oil Drilling

scholarly journals Structure and rheology during catastrophic phase inversion of Pickering emulsions stabilized with fumed silica particles

2020 ◽  
Vol 593 ◽  
pp. 124630
Author(s):  
Frederico Macedo Fernandes Barros ◽  
Christophe Chassenieux ◽  
Marli Miriam de Souza Lima ◽  
Lazhar Benyahia
Keyword(s):  
Fumed Silica ◽  
Phase Inversion ◽  
Silica Particles ◽  
Pickering Emulsions
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