The zeta potential of surface-functionalized metallic nanorod particles in aqueous solution

George M. Dougherty, Klint A. Rose, Jeffrey B H Tok, Satinderpall S. Pannu, Frank Chuang, Michael Y. Sha, Gabriela Chakarova, Sharron G. Penn

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Metallic nanoparticles suspended in aqueous solutions and functionalized with chemical and biological surface coatings are important elements in basic and applied nanoscience research. Many applications require an understanding of the electrokinetic or colloidal properties of such particles. We describe the results of experiments to measure the zeta potential of metallic nanorod particles in aqueous saline solutions, including the effects of pH, ionic strength, metallic composition, and surface functionalization state. Particle substrates tested include gold, silver, and palladium monometallic particles as well as gold/ silver bimetallic particles. Surface functionalization conditions included 11-mercaptoundecanoic acid (MUA), mercaptoethanol (ME), and mercaptoethanesulfonic acid (MESA) self-assembled monolayers (SAMs), as well as MUA layers subsequently derivatized with proteins. For comparison, we present zeta potential data for typical charge-stabilized polystyrene particles. We compare experimental zeta potential data with theoretically predicted values for SAM-coated and bimetallic particles. The results of these studies are useful in predicting and controlling the aggregation, adhesion, and transport of functionalized metallic nanoparticles within microfluidic devices and other systems.

Original languageEnglish (US)
Pages (from-to)1131-1139
Number of pages9
JournalElectrophoresis
Volume29
Issue number5
DOIs
StatePublished - Mar 2008

Fingerprint

Metal Nanoparticles
Nanotubes
Lab-On-A-Chip Devices
Zeta potential
Nanorods
Silver
Gold
Self assembled monolayers
Acids
Mercaptoethanol
Polystyrenes
Palladium
Sodium Chloride
Osmolar Concentration
Nanoparticles
Nanoscience
Surface states
Ionic strength
Microfluidics
Chemical elements

Keywords

  • Aqueous solution
  • Nanoparticle
  • Nanorod
  • Self-assembled monolayer
  • Zeta potential

ASJC Scopus subject areas

  • Clinical Biochemistry

Cite this

Dougherty, G. M., Rose, K. A., Tok, J. B. H., Pannu, S. S., Chuang, F., Sha, M. Y., ... Penn, S. G. (2008). The zeta potential of surface-functionalized metallic nanorod particles in aqueous solution. Electrophoresis, 29(5), 1131-1139. https://doi.org/10.1002/elps.200700448

The zeta potential of surface-functionalized metallic nanorod particles in aqueous solution. / Dougherty, George M.; Rose, Klint A.; Tok, Jeffrey B H; Pannu, Satinderpall S.; Chuang, Frank; Sha, Michael Y.; Chakarova, Gabriela; Penn, Sharron G.

In: Electrophoresis, Vol. 29, No. 5, 03.2008, p. 1131-1139.

Research output: Contribution to journalArticle

Dougherty, GM, Rose, KA, Tok, JBH, Pannu, SS, Chuang, F, Sha, MY, Chakarova, G & Penn, SG 2008, 'The zeta potential of surface-functionalized metallic nanorod particles in aqueous solution', Electrophoresis, vol. 29, no. 5, pp. 1131-1139. https://doi.org/10.1002/elps.200700448
Dougherty, George M. ; Rose, Klint A. ; Tok, Jeffrey B H ; Pannu, Satinderpall S. ; Chuang, Frank ; Sha, Michael Y. ; Chakarova, Gabriela ; Penn, Sharron G. / The zeta potential of surface-functionalized metallic nanorod particles in aqueous solution. In: Electrophoresis. 2008 ; Vol. 29, No. 5. pp. 1131-1139.
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