2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Stimulated Self-assembly from Clay Nanoplatelets

J.O. Fossum
Norwegian University of Science and Technology (NTNU), NO

self-assembly, clay particles, responsive particles, smart structures

In the general context of self-assembly of nanoparticles, we have studied interconnected complex physical phenomena such as: (i) Phase separation and nematic self-assembly in gravity of clay particles suspended in salt water. (ii) Transitions from biaxial to uniaxial nematics by application of external magnetic field in selfassembled systems of clay nanoparticle systems. (iii) Guided self-assembly into chainlike structures of clay nanoparticles suspended in oil subjected to external electrical fields (electrorheological structures of polarized nanoparticles), and then the stability of, such structures, when subjected to external mechanical stresses. The particles we have been studying in all cases (i) - (iii) are smectite clay platelet particles (fluorohectorite or laponite), and the experimental techniques include synchrotron X-ray scattering, neutron scattering, rheometry. microscopy and magnetic resonance. We have demonstrated that clays may be used as good model systems for studies of selfassembled nanostructured soft and complex matter. Self-assembly and related transitions in clay systems in particular, may have practical relevance for nano-patterning, properties of nanocomposites, and macroscopically anisotropic gels, among many other applications.

Nanotech 2008 Conference Program Abstract