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Title: Polyethylene-Glycol-Mediated Self-Assembly of Magnetite Nanoparticles at the Liquid/Vapor Interface

It is shown that magnetite nanoparticles (MagNPs) grafted with polyethylene glycol (PEG) self-assemble and short-range-order as 2D films at surfaces of aqueous suspensions by manipulating salt concentrations. Synchrotron X-ray reflectivity and grazing-incidence small angle X-ray scattering studies reveal that K 2CO 3 induces the migration of the PEG-MagNPs to the liquid/vapor interface to form a Gibbs layer of monoparticle in thickness. As the salt concentration and/or nanoparticle concentration increase, the surface-adsorbed nanoparticles become more organized. And further increase in salt concentration leads to the growth of an additional incomplete nanoparticle layer contiguous to the first one at the vapor/liquid interface that remains intact.
ORCiD logo [1] ;  [2] ;  [1] ;  [3]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  2. Ames Lab., Ames, IA (United States). Division of Materials Sciences and Engineering
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Materials Science and Engineering
Publication Date:
Report Number(s):
Journal ID: ISSN 2196-7350
Grant/Contract Number:
AC02-07CH11358; AC02-06CH11357
Accepted Manuscript
Journal Name:
Advanced Materials Interfaces
Additional Journal Information:
Journal Volume: 5; Journal Issue: 6; Journal ID: ISSN 2196-7350
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
Country of Publication:
United States
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; PEG‐functionalized nanoparticles; grazing‐incidence X‐ray diffraction at small angles (GISAXS); magnetitite nanoparticles; nanoparticle self‐assembly; X‐ray reflectivity
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1417716