Salt-Induced Liquid–Liquid Phase Separation and Interfacial Crystal Formation in Poly(N-isopropylacrylamide)-Capped Gold Nanoparticles
dc.contributor.author | Londoño-Calderon, Alejandra | |
dc.contributor.author | Wang, Wenjie | |
dc.contributor.author | Lawrence, Jack | |
dc.contributor.author | Bu, Wei | |
dc.contributor.author | Vaknin, David | |
dc.contributor.author | Prozorov, Tanya | |
dc.contributor.department | Ames National Laboratory | |
dc.contributor.department | Physics and Astronomy | |
dc.date | 2021-03-13T06:27:19.000 | |
dc.date.accessioned | 2021-04-29T23:39:23Z | |
dc.date.available | 2021-04-29T23:39:23Z | |
dc.date.embargo | 2022-03-01 | |
dc.date.issued | 2021-03-01 | |
dc.description.abstract | <p>We report on the dynamic response of aqueous solution containing poly(<em>N</em>-isopropylacrylamide)-capped gold (pNIPAM-capped Au) nanoparticles to the introduction of NaCl. The addition of NaCl increases the density of the solution and prompts the liquid–liquid phase separation process, confining the polymer to a lower-density salt-deficient aqueous phase. As the pNIPAM-occupied aqueous phase becomes excluded from the higher-density NaCl-rich bulk solution, the pNIPAM-capped Au nanoparticles follow liquid–liquid phase separation and reside on the surface of the formed pNIPAM-filled globes at the interface between the NaCl-rich bulk solution and the pNIPAM-containing solution, exhibiting a hexagonal packing with interparticle distance of ∼23 nm. Driven by the minimization of hydrophobic interactions, the buoyant Au-decorated globular assemblies filled with aqueous pNIPAM solution escape to the air/water interface, collapse at the interface, and form planar hexagonal crystalline domains of different sizes, depending on NaCl concentration. At low NaCl concentrations, the collapse of the Au-decorated aqueous pNIPAM-filled globes at the air/water interface produces an interfacial two-dimensional (2D) hexagonal lattice of pNIPAM-capped Au nanoparticles with an interparticle distance of 25–27 nm. The increase in NaCl concentration leads to a formation of smaller globes escaping to, and collapsing at the air/water interface and yielding smaller two-dimensional hexagonal domains.</p> | |
dc.identifier | archive/lib.dr.iastate.edu/ameslab_manuscripts/846/ | |
dc.identifier.articleid | 1855 | |
dc.identifier.contextkey | 22041399 | |
dc.identifier.s3bucket | isulib-bepress-aws-west | |
dc.identifier.submissionpath | ameslab_manuscripts/846 | |
dc.identifier.uri | https://dr.lib.iastate.edu/handle/20.500.12876/104488 | |
dc.language.iso | en | |
dc.relation.ispartofseries | IS-J 10439 | |
dc.source.bitstream | archive/lib.dr.iastate.edu/ameslab_manuscripts/846/IS_J_10439.pdf|||Sat Jan 15 02:11:48 UTC 2022 | |
dc.source.uri | 10.1021/acs.jpcc.0c11307 | |
dc.subject.disciplines | Nanoscience and Nanotechnology | |
dc.subject.disciplines | Physical Chemistry | |
dc.subject.disciplines | Polymer Chemistry | |
dc.subject.keywords | Interfaces | |
dc.subject.keywords | Metal nanoparticles | |
dc.subject.keywords | Thermoresponsive polymers | |
dc.subject.keywords | Nanoparticles | |
dc.subject.keywords | Lattices | |
dc.title | Salt-Induced Liquid–Liquid Phase Separation and Interfacial Crystal Formation in Poly(N-isopropylacrylamide)-Capped Gold Nanoparticles | |
dc.type | article | |
dc.type.genre | article | |
dspace.entity.type | Publication | |
relation.isOrgUnitOfPublication | 25913818-6714-4be5-89a6-f70c8facdf7e | |
relation.isOrgUnitOfPublication | 4a05cd4d-8749-4cff-96b1-32eca381d930 |
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