Colloidal stability of self-assembled monolayer-coated gold nanoparticles: The effects of surface compositional and structural heterogeneity

Rixiang Huang, Randy Carney, Francesco Stellacci, Boris L T Lau

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Surface heterogeneity plays an important role in controlling colloidal phenomena. This study investigated the self-aggregation and bacterial adsorption of self-assembled monolayer coated gold nanoparticles (AuNPs) with different surface compositional and structural heterogeneity. Evaluation was performed on AuNPs coated with (1) one ligand with charged terminals (MUS), (2) two homogeneously distributed ligands with respectively charged and nonpolar terminals (brOT) and (3) two ligands with respectively charged and nonpolar terminals with stripe-like distribution (OT). The brOT particles have less negative electrophoretic mobility (EPM) values, smaller critical coagulation concentration (CCC) and larger adsorption rate on Escherichia coli than that of AuNPs with homogeneously charged groups, in good agreement with DLVO predictions. Although the ligand composition on the surface of AuNPs is the same, OT particles have less negative EPM values and faster rate of bacterial adsorption, but much larger CCC compared to brOT. The deviation of OT particles from brOT and MUS in their self-aggregation behavior reflects the effects of surface heterogeneity on electrical double layer structures at the interface. Results from the present study demonstrated that, besides chemical composition, organization of ligands on particle surface is important in determining their colloidal stability.

Original languageEnglish (US)
Pages (from-to)11560-11566
Number of pages7
JournalLangmuir
Volume29
Issue number37
DOIs
StatePublished - Sep 17 2013
Externally publishedYes

Fingerprint

Self assembled monolayers
Gold
Ligands
gold
Nanoparticles
nanoparticles
ligands
Electrophoretic mobility
coagulation
Coagulation
Adsorption
adsorption
Agglomeration
Escherichia
Chemical analysis
Escherichia coli
chemical composition
deviation
evaluation
predictions

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Colloidal stability of self-assembled monolayer-coated gold nanoparticles : The effects of surface compositional and structural heterogeneity. / Huang, Rixiang; Carney, Randy; Stellacci, Francesco; Lau, Boris L T.

In: Langmuir, Vol. 29, No. 37, 17.09.2013, p. 11560-11566.

Research output: Contribution to journalArticle

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