A variable pressure method for characterizing nanoparticle surface charge using pore sensors

Vogel, Robert, Anderson, Will, Eldridge, James, Glossop, Ben and Willmott, Geoff (2012) A variable pressure method for characterizing nanoparticle surface charge using pore sensors. Analytical Chemistry, 84 7: 3125-3131.


Author Vogel, Robert
Anderson, Will
Eldridge, James
Glossop, Ben
Willmott, Geoff
Title A variable pressure method for characterizing nanoparticle surface charge using pore sensors
Journal name Analytical Chemistry  (ERA 2012 Listed)    (ERA 2010 Rank A*)   Check publisher's open access policy
Publication date 2012-04
Sub-type Article
DOI 10.1021/ac2030915
Volume number 84
Issue number 7
ISSN 0003-2700
1520-6882
Start page 3125
End page 3131
Total pages 7
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2013
Language eng
Abstract A novel method using resistive pulse sensors for electrokinetic surface charge measurements of nanoparticles is presented. This method involves recording the particle blockade rate while the pressure applied across a pore sensor is varied. This applied pressure acts in a direction which opposes transport due to the combination of electro-osmosis, electrophoresis, and inherent pressure. The blockade rate reaches a minimum when the velocity of nanoparticles in the vicinity of the pore approaches zero, and the forces on typical nanoparticles are in equilibrium. The pressure applied at this minimum rate can be used to calculate the zeta potential of the nanoparticles. The efficacy of this variable pressure method was demonstrated for a range of carboxylated 200 nm polystyrene nanoparticles with different surface charge densities. Results were of the same order as phase analysis light scattering (PALS) measurements. Unlike PALS results, the sequence of increasing zeta potential for different particle types agreed with conductometric titration.
Keyword Resistive Pulse Technique
Submicron Particles
Coulter-Counter
Transport
Flow
Size
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Publication Date (Web): 27 February 2012.

 
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