Poly(N-isopropylacrylamide)-grafted gold nanoparticles at the vapor/water interface
Abstract
Hypothesis: Grafting nanoparticles surfaces with water-soluble polymers modify interparticle interactions that are pivotal for assembling them into ordered phases. By manipulating salt concentrations of gold nanoparticles (AuNPs) that are grafted with poly(N-isopropylacrylamide) (PNIPAM-AuNPs), we hypothesize that various aggregated phases form at the suspension/vapor interface or in the bulk that depend on the molecular weight (MW) of PNIPAM and on salt concentrations. Experiments: AuNPs are grafted with thiolated PNIPAM of molecular weights of 3 or 6 kDa, and grafting is confirmed by dynamic light scattering. Liquid-surfaces X-ray reflectivity and grazing incidence small-angle X-ray scattering are used to determine the density profiles of the suspension/vapor interface and their inplane structure as salt is added to the suspensions. Findings: We observe that surface enrichment is induced by adding NaCl to the suspensions, and that at low salt concentrations, the monoparticle layer formed is dispersed, and above a threshold salt concentration, depending on MW of PNIPAM, the PNIPAM-AuNPs order in a hexagonal structure. We show that the lattice constant of the two-dimensional hexagonal structure varies with salt concentration, and more significantly with MW of PNIPAM.
- Authors:
-
- Ames Lab., Ames, IA (United States)
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
- Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE
- OSTI Identifier:
- 1735334
- Alternate Identifier(s):
- OSTI ID: 1775885
- Report Number(s):
- IS-J-10,367
Journal ID: ISSN 0021-9797
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Colloid and Interface Science
- Additional Journal Information:
- Journal Volume: 585; Journal ID: ISSN 0021-9797
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; PNIPAM-grafted nanoparticles; Interfacial superlattice; X-ray reflectivity; Grazing incidence small angle X-ray scattering (GI-SAXS)
Citation Formats
Minier, Samuel, Kim, Hyeong Jin, Zaugg, Jonathan, Mallapragada, Surya K., Vaknin, David, and Wang, Wenjie. Poly(N-isopropylacrylamide)-grafted gold nanoparticles at the vapor/water interface. United States: N. p., 2020.
Web. doi:10.1016/j.jcis.2020.11.080.
Minier, Samuel, Kim, Hyeong Jin, Zaugg, Jonathan, Mallapragada, Surya K., Vaknin, David, & Wang, Wenjie. Poly(N-isopropylacrylamide)-grafted gold nanoparticles at the vapor/water interface. United States. https://doi.org/10.1016/j.jcis.2020.11.080
Minier, Samuel, Kim, Hyeong Jin, Zaugg, Jonathan, Mallapragada, Surya K., Vaknin, David, and Wang, Wenjie. Fri .
"Poly(N-isopropylacrylamide)-grafted gold nanoparticles at the vapor/water interface". United States. https://doi.org/10.1016/j.jcis.2020.11.080. https://www.osti.gov/servlets/purl/1735334.
@article{osti_1735334,
title = {Poly(N-isopropylacrylamide)-grafted gold nanoparticles at the vapor/water interface},
author = {Minier, Samuel and Kim, Hyeong Jin and Zaugg, Jonathan and Mallapragada, Surya K. and Vaknin, David and Wang, Wenjie},
abstractNote = {Hypothesis: Grafting nanoparticles surfaces with water-soluble polymers modify interparticle interactions that are pivotal for assembling them into ordered phases. By manipulating salt concentrations of gold nanoparticles (AuNPs) that are grafted with poly(N-isopropylacrylamide) (PNIPAM-AuNPs), we hypothesize that various aggregated phases form at the suspension/vapor interface or in the bulk that depend on the molecular weight (MW) of PNIPAM and on salt concentrations. Experiments: AuNPs are grafted with thiolated PNIPAM of molecular weights of 3 or 6 kDa, and grafting is confirmed by dynamic light scattering. Liquid-surfaces X-ray reflectivity and grazing incidence small-angle X-ray scattering are used to determine the density profiles of the suspension/vapor interface and their inplane structure as salt is added to the suspensions. Findings: We observe that surface enrichment is induced by adding NaCl to the suspensions, and that at low salt concentrations, the monoparticle layer formed is dispersed, and above a threshold salt concentration, depending on MW of PNIPAM, the PNIPAM-AuNPs order in a hexagonal structure. We show that the lattice constant of the two-dimensional hexagonal structure varies with salt concentration, and more significantly with MW of PNIPAM.},
doi = {10.1016/j.jcis.2020.11.080},
journal = {Journal of Colloid and Interface Science},
number = ,
volume = 585,
place = {United States},
year = {Fri Nov 27 00:00:00 EST 2020},
month = {Fri Nov 27 00:00:00 EST 2020}
}
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