Forming Stable Dispersions of Nanoparticles

Rawle, Alan F.. (2009) Forming Stable Dispersions of Nanoparticles. In: IGERT Seminar Series, 2008 - 2009, University of Massachusetts Amherst. (Unpublished)

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Abstract

Discrete and stable dispersions (solid particles in a liquid carrier) of nanoparticles are required for a wide range of applications. Pertinent examples include: (1) Titanium dioxide of 20 – 50nm used for UV absorbing properties in transparent varnishes, (2) Colloidal gold used to carry drugs through a biological barrier, (3) Quantum dots where the size of particle dictates the observed color. Top down (for example comminution) processes from bulk or powdered materials are often used in attempts to produce dispersions. Such dispersions usually are not truly ‘nano’ (100% < 100nm) and suffer from sedimentation or agglomeration issues. The basics of particle-particle interactions (van der Waals forces) in the dry state will be discussed together with the fundamental mechanisms for keeping particles from interacting and agglomerating (adequate zeta potential). These fundamental forces predominate over inertial forces on the small scale. This means that classic technology on the micron scale is dangerous if used to extrapolate to the nanoscale. Typically this favors the production of stable nanosystems by means of bottom-up approaches such as sol gel and chemical reduction stages. This talk will focus on the key issues in producing and characterizing stable nanoparticulate dispersions.

Item Type: Conference or Workshop Item (Lecture)
InterNano Taxonomy: Nanoscale Objects and Nanostructured Materials > Nanoparticles
Collections: IGERT Seminar Series
Depositing User: Rebecca Reznik-Zellen
Date Deposited: 30 Jan 2009 17:38
Last Modified: 30 Jan 2009 17:38
URI: http://eprints.internano.org/id/eprint/37

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