Single-particle tracking of the formation of a pseudo-equilibrium state prior to interfacial charged microgel cluster formation
The interaction between micron-sized particles and their self-assembly properties at fluid interfaces are important in several applications including the stabilization of Pickering emulsions and creation of colloidosomes. In this study, through real time visualization of the diffusion of microgel pa...
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| Other Authors: | |
| Format: | Conference Paper |
| Language: | English |
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2020
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| Online Access: | https://hdl.handle.net/10356/144274 |
| _version_ | 1826110852399366144 |
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| author | Yeow, Edwin K. L. |
| author2 | Asian Spectroscopy Conference 2020 |
| author_facet | Asian Spectroscopy Conference 2020 Yeow, Edwin K. L. |
| author_sort | Yeow, Edwin K. L. |
| collection | NTU |
| description | The interaction between micron-sized particles and their self-assembly properties at fluid interfaces are important in several applications including the stabilization of Pickering emulsions and creation of colloidosomes. In this study, through real time visualization of the diffusion of microgel particles at the air-water interface of an aqueous pendant drop, the formation of a pseudo-equilibrium state is observed prior to particle coalescence. It is shown here that at the microscopic level, a pendant drop surface has non-uniform principal curvatures and exhibits positive deviatoric curvature (+Δc) gradients. The +Δc gradients confer super-diffusive motion to single ionic microgel particles and are responsible for bringing particles, initially far apart, to common sites on the interface with high curvatures. Prior to two-particle cluster formation, the balance between pair-wise repulsion, capillary attraction and +Δc-induced energy pushing the pair of particles to high curvature creates a pseudo-equilibrium state where the inter-particle distance remains relatively invariant for a long period of time. This observation is also noted during higher cluster formation. Thereafter, a sufficiently strong long-ranged attraction potential is activated to facilitate cluster formation. The real-time tracking of the evolution of cluster formation provides useful insights into the interplay between various interactions experienced by the ionic microgels. |
| first_indexed | 2024-10-01T02:40:57Z |
| format | Conference Paper |
| id | ntu-10356/144274 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:40:57Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1442742020-10-29T20:10:36Z Single-particle tracking of the formation of a pseudo-equilibrium state prior to interfacial charged microgel cluster formation Yeow, Edwin K. L. Asian Spectroscopy Conference 2020 Institute of Advanced Studies Science::Chemistry Wide-field Microscopy Micorgel The interaction between micron-sized particles and their self-assembly properties at fluid interfaces are important in several applications including the stabilization of Pickering emulsions and creation of colloidosomes. In this study, through real time visualization of the diffusion of microgel particles at the air-water interface of an aqueous pendant drop, the formation of a pseudo-equilibrium state is observed prior to particle coalescence. It is shown here that at the microscopic level, a pendant drop surface has non-uniform principal curvatures and exhibits positive deviatoric curvature (+Δc) gradients. The +Δc gradients confer super-diffusive motion to single ionic microgel particles and are responsible for bringing particles, initially far apart, to common sites on the interface with high curvatures. Prior to two-particle cluster formation, the balance between pair-wise repulsion, capillary attraction and +Δc-induced energy pushing the pair of particles to high curvature creates a pseudo-equilibrium state where the inter-particle distance remains relatively invariant for a long period of time. This observation is also noted during higher cluster formation. Thereafter, a sufficiently strong long-ranged attraction potential is activated to facilitate cluster formation. The real-time tracking of the evolution of cluster formation provides useful insights into the interplay between various interactions experienced by the ionic microgels. Published version 2020-10-26T07:05:20Z 2020-10-26T07:05:20Z 2020 Conference Paper Yeow, E. K. L. (2020). Single-particle tracking of the formation of a pseudo-equilibrium state prior to interfacial charged microgel cluster formation. Proc. Of the 7th Asian Spectroscopy Conference (ASC 2020). doi:10.32655/ASC_8-10_Dec2020.33 https://hdl.handle.net/10356/144274 10.32655/ASC_8-10_Dec2020.33 en © 2020 Nanyang Technological University. application/pdf |
| spellingShingle | Science::Chemistry Wide-field Microscopy Micorgel Yeow, Edwin K. L. Single-particle tracking of the formation of a pseudo-equilibrium state prior to interfacial charged microgel cluster formation |
| title | Single-particle tracking of the formation of a pseudo-equilibrium state prior to interfacial charged microgel cluster formation |
| title_full | Single-particle tracking of the formation of a pseudo-equilibrium state prior to interfacial charged microgel cluster formation |
| title_fullStr | Single-particle tracking of the formation of a pseudo-equilibrium state prior to interfacial charged microgel cluster formation |
| title_full_unstemmed | Single-particle tracking of the formation of a pseudo-equilibrium state prior to interfacial charged microgel cluster formation |
| title_short | Single-particle tracking of the formation of a pseudo-equilibrium state prior to interfacial charged microgel cluster formation |
| title_sort | single particle tracking of the formation of a pseudo equilibrium state prior to interfacial charged microgel cluster formation |
| topic | Science::Chemistry Wide-field Microscopy Micorgel |
| url | https://hdl.handle.net/10356/144274 |
| work_keys_str_mv | AT yeowedwinkl singleparticletrackingoftheformationofapseudoequilibriumstatepriortointerfacialchargedmicrogelclusterformation |