A Simple Model for the Viscosity of Pickering Emulsions
A new model is proposed for the viscosity of Pickering emulsions at low shear rates. The model takes into consideration the increase in the effective volume fraction of droplets, due to the presence of an interfacial layer of solid nanoparticles at the oil-water interface. The model also considers a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-12-01
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| Series: | Fluids |
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| Online Access: | https://www.mdpi.com/2311-5521/3/1/2 |
| _version_ | 1818158408639971328 |
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| author | Rajinder Pal |
| author_facet | Rajinder Pal |
| author_sort | Rajinder Pal |
| collection | DOAJ |
| description | A new model is proposed for the viscosity of Pickering emulsions at low shear rates. The model takes into consideration the increase in the effective volume fraction of droplets, due to the presence of an interfacial layer of solid nanoparticles at the oil-water interface. The model also considers aggregation of droplets and eventual jamming of Pickering emulsion at high volume fraction of dispersed phase. According to the proposed model, the relative viscosity of a Pickering emulsion at low shear rates is dependent on three factors: contact angle, ratio of bare droplet radius to solid nanoparticle radius, and the volume fraction of bare droplets. For a given radius of nanoparticles, the relative viscosity of a Pickering emulsion increases with the decrease in bare droplet radius. For O/W Pickering emulsions, the relative viscosity decreases with the increase in contact angle. The W/O Pickering emulsion exhibits an opposite behavior in that the relative viscosity increases with the increase in contact angle. The proposed model describes the experimental viscosity data for Pickering emulsions reasonably well. |
| first_indexed | 2024-12-11T15:29:37Z |
| format | Article |
| id | doaj.art-ecd84cedf97741f4a68f620baaf09937 |
| institution | Directory Open Access Journal |
| issn | 2311-5521 |
| language | English |
| last_indexed | 2024-12-11T15:29:37Z |
| publishDate | 2017-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj.art-ecd84cedf97741f4a68f620baaf099372022-12-22T01:00:06ZengMDPI AGFluids2311-55212017-12-0131210.3390/fluids3010002fluids3010002A Simple Model for the Viscosity of Pickering EmulsionsRajinder Pal0Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, CanadaA new model is proposed for the viscosity of Pickering emulsions at low shear rates. The model takes into consideration the increase in the effective volume fraction of droplets, due to the presence of an interfacial layer of solid nanoparticles at the oil-water interface. The model also considers aggregation of droplets and eventual jamming of Pickering emulsion at high volume fraction of dispersed phase. According to the proposed model, the relative viscosity of a Pickering emulsion at low shear rates is dependent on three factors: contact angle, ratio of bare droplet radius to solid nanoparticle radius, and the volume fraction of bare droplets. For a given radius of nanoparticles, the relative viscosity of a Pickering emulsion increases with the decrease in bare droplet radius. For O/W Pickering emulsions, the relative viscosity decreases with the increase in contact angle. The W/O Pickering emulsion exhibits an opposite behavior in that the relative viscosity increases with the increase in contact angle. The proposed model describes the experimental viscosity data for Pickering emulsions reasonably well.https://www.mdpi.com/2311-5521/3/1/2Pickering emulsionscontact anglenanoparticlesinterfacerheologyviscosity |
| spellingShingle | Rajinder Pal A Simple Model for the Viscosity of Pickering Emulsions Fluids Pickering emulsions contact angle nanoparticles interface rheology viscosity |
| title | A Simple Model for the Viscosity of Pickering Emulsions |
| title_full | A Simple Model for the Viscosity of Pickering Emulsions |
| title_fullStr | A Simple Model for the Viscosity of Pickering Emulsions |
| title_full_unstemmed | A Simple Model for the Viscosity of Pickering Emulsions |
| title_short | A Simple Model for the Viscosity of Pickering Emulsions |
| title_sort | simple model for the viscosity of pickering emulsions |
| topic | Pickering emulsions contact angle nanoparticles interface rheology viscosity |
| url | https://www.mdpi.com/2311-5521/3/1/2 |
| work_keys_str_mv | AT rajinderpal asimplemodelfortheviscosityofpickeringemulsions AT rajinderpal simplemodelfortheviscosityofpickeringemulsions |