Effect of Polymer Chain Length on the Superlattice Assembly of Functionalized Gold Nanoparticles

Date
2021-08-24
Authors
Kim, Hyeong Jin
Wang, Wenjie
Zhang, Honghu
Freychet, Guillaume
Ocko, Benjamin
Travesset, Alex
Mallapragada, Surya
Vaknin, David
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Ames LaboratoryPhysics and AstronomyNeuroscienceMaterials Science and EngineeringChemical and Biological Engineering
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.

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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.

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