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Journal of Chemical Physics / Volume 132 / Issue 19 / ARTICLES / Polymers and Complex Systems

J. Chem. Phys. 132, 194903 (2010); http://dx.doi.org/10.1063/1.3425883 (6 pages)

Dynamic light scattering investigations of nanoparticle aggregation following a light-induced pH jump

Ryan J. Murphy, Denis Pristinski, Kalman Migler, Jack F. Douglas, and Vivek M. Prabhu

Polymers Division, National Institute of Standards and Technology, 100 Bureau Dr., Gaithersburg, Maryland 20899-8541, USA

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(Received 17 March 2010; accepted 15 April 2010; published online 19 May 2010)

There are many important processes where the stability of nanoparticles can change due to changes in solution environment. These processes are often difficult to study under controlled changes to the solution conditions. Dynamic light scattering was used to measure the initial kinetics of aggregation of carboxylated polystyrene nanoparticles after well-defined pH jumps using aqueous solutions of photoacid generator (PAG). With this approach, the pH of the solution was controlled by exposure to ultraviolet (UV) light without the delays from mixing or stirring. The aggregation kinetics of the nanoparticles was extremely sensitive to the solution pH. The UV exposure dose is inversely correlated with the resulting surface charge of the nanoparticles. Decreasing pH decreases the electrostatic repulsion force between particles and leads to aggregation. The reaction-limited or diffusion-limited aggregation kinetics was sensitive to the pH quench depth, relative to the acid-equilibrium constant (pKa) of the surface carboxylic acid groups on the nanoparticles. Since numerous PAGs are commercially available, this approach provides a flexible method to study the aggregation of a variety of solvent-dispersed nanoparticle systems.

© 2010 U.S. Government

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL
    1. Materials
    2. pH jump
    3. DLS
  3. RESULTS AND DISCUSSIONS
    1. pH quench methodology
    2. Nanoparticle suspension stability
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

aggregation, chemical equilibrium, light scattering, nanoparticles, pH, polymers, radiation quenching, surface scattering, ultraviolet radiation effects

PACS

  • 82.70.-y

    Disperse systems; complex fluids

  • 82.60.Hc

    Chemical equilibria and equilibrium constants

  • 78.66.Qn

    Polymers; organic compounds

  • 73.25.+i

    Surface conductivity and carrier phenomena

  • 61.80.Ba

    Ultraviolet, visible, and infrared radiation effects (including laser radiation)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3425883

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef U.S. Government

For access to fully linked references, you need to log in.
    M. Y. Lin, H. M. Lindsay, D. A. Weitz, R. C. Ball, R. Klein, and P. Meakin, Phys. Rev. A 41, 2005 (1990).

    P. Štepánek, J. Chem. Phys. 99, 6384 (1993)JCPSA6000099000009006384000001.


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