Poly(N-isopropylacrylamide)-grafted gold nanoparticles at the vapor/water interface

Minier, Samuel; Kim, Hyeong Jin; Zaugg, Jonathan; Mallapragada, Surya K.; Vaknin, David; Wang, Wenjie

doi:10.1016/j.jcis.2020.11.080

Poly(N-isopropylacrylamide)-grafted gold nanoparticles at the vapor/water interface

Journal Article · Thu Nov 26 23:00:00 EST 2020 · Journal of Colloid and Interface Science

DOI:https://doi.org/10.1016/j.jcis.2020.11.080· OSTI ID:1735334

Minier, Samuel ^[1]; Kim, Hyeong Jin ^[2]; Zaugg, Jonathan ^[1]; Mallapragada, Surya K. ^[2]; Vaknin, David ^[3]; Wang, Wenjie ^[2]

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)

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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1735334

Alternate ID(s):: OSTI ID: 1775885

Report Number(s):: IS--J-10,367

Journal Information:: Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Vol. 585; ISSN 0021-9797

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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