Assessing the pair interactions of pNIPAM microgel particles using optical tweezers
Fuente:
arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | |
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| _version_ | 1866929525658484736 |
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| author | Muñetón-Díaz, José Zhang, Chi Priti, Priti Mohanty Scheffold, Frank |
| author_facet | Muñetón-Díaz, José Zhang, Chi Priti, Priti Mohanty Scheffold, Frank |
| contents | We experimentally study the pairwise interactions between poly(N-isopropylacrylamide) (pNIPAM) microgel particles using line optical tweezers. To measure their interaction potentials under controlled conditions, we trap two microgel particles in the tweezer and analyze their thermal positional fluctuations near contact. The pair interaction potential is modeled using a Hertzian core polymer brush corona framework, capturing the complexity of particle interactions by accounting for both the deformable, elastic core and the steric effects of the polymer brush-like shell. Our experimental results demonstrate that the brush corona interactions soften as the system approaches the lower critical solution temperature (LCST) of the microgels, consistent with the decay of the polymer's second virial coefficient. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_02641 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Assessing the pair interactions of pNIPAM microgel particles using optical tweezers Muñetón-Díaz, José Zhang, Chi Priti, Priti Mohanty Scheffold, Frank Soft Condensed Matter We experimentally study the pairwise interactions between poly(N-isopropylacrylamide) (pNIPAM) microgel particles using line optical tweezers. To measure their interaction potentials under controlled conditions, we trap two microgel particles in the tweezer and analyze their thermal positional fluctuations near contact. The pair interaction potential is modeled using a Hertzian core polymer brush corona framework, capturing the complexity of particle interactions by accounting for both the deformable, elastic core and the steric effects of the polymer brush-like shell. Our experimental results demonstrate that the brush corona interactions soften as the system approaches the lower critical solution temperature (LCST) of the microgels, consistent with the decay of the polymer's second virial coefficient. |
| title | Assessing the pair interactions of pNIPAM microgel particles using optical tweezers |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2410.02641 |