Campus Units

Chemical and Biological Engineering, Materials Science and Engineering, Neuroscience, Ames Laboratory, Physics and Astronomy

Document Type

Article

Research Focus Area

Advanced and Nanostructured Materials

Publication Version

Submitted Manuscript

Publication Date

8-24-2021

Journal or Book Title

Langmuir

Volume

37

Issue

33

First Page

10143

Last Page

10149

DOI

10.1021/acs.langmuir.1c01547

Abstract

We report on the assembly of gold nanoparticle (AuNPs) superlattices at the liquid/vapor interface and in the bulk of their suspensions. Interparticle distances in the assemblies are achieved on multiple length scales by varying chain lengths of surface grafted AuNPs by polyethylene glycol (PEG) with molecular weights in the range 2000–40,000 Da. Crystal structures and lattice constants in both 2D and 3D assemblies are determined by synchrotron-based surface-sensitive and small-angle X-ray scattering. Assuming knowledge of grafting density, we show that experimentally determined interparticle distances are adequately modeled by spherical brushes close to the θ point (Flory–Huggins parameter, ) for 2D superlattices at a liquid interface and a nonsolvent (χ = ∞) for the 3D dry superlattices.

Comments

This is a manuscript of an article published as Kim, Hyeong Jin, Wenjie Wang, Honghu Zhang, Guillaume Freychet, Benjamin M. Ocko, Alex Travesset, Surya K. Mallapragada, and David Vaknin. "Effect of Polymer Chain Length on the Superlattice Assembly of Functionalized Gold Nanoparticles." 37, no. 33 Langmuir (2021): 10143–10149. DOI: 10.1021/acs.langmuir.1c01547. Posted with permission.

Copyright Owner

American Chemical Society

Language

en

File Format

application/pdf

Published Version

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