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Saturday, 19 October 2019
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2012 jppc hamaker agHamaker constant dependence on size calculated

Dr. Pinchuk from the University of Colorado has theoretically calculated the dependence of Hamaker constant from the size of nanoparticles. Hamaker constant - the parameter showing the strength of van der Waals interaction between molecules or surfaces. The article shows that the Hamaker constant increases with the decrease of the size of silver nanoparticles. This finding is essential not only for understanding the fundamentals of behaviour of colloids, but also can help in applications, where the stable colloidal solution needs to be produced, or contrary, a selforganization of particles is required.

 

The size effect in silver nanoparticles is related to the internal size effect caused by the scattering of conduction electrons from the surface of the nanoparticles. The increased scattering rate results in larger damping and larger imaginary part of the complex size-dependent dielectric permittivity of silver. This size dependence in turn leads to larger integrands in the Lifshitz integrals and larger Lifshitz and Hamaker constants.

Further information can be found in the Journal of Physical Chemistry C.

Image is printed with permission of ACS
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