VENUE CHANGE!!  Parker H. Petit Room 1128

Speaker for September 24: Tina Salguero, University of Georgia, Department of Chemistry

Nanoscience of Metal Silicate-Based Pigments:

The colored component of several important ancient pigments, including Egyptian blue and Han blue, are based on alkali earth copper tetrasilicate materials. In recent work, we have found that these layered materials can be chemically exfoliated into their constituent monolayers to provide alkali earth copper tetrasilicate nanosheets—defined by nanometer thickness and lateral dimensions that are on the order of several microns. The facile exfoliation of these materials into nanosheets is especially surprising in view of their long history on artifacts under a variety of environmental conditions, and we have examined the issue of whether archaeological samples are affected by this exfoliation mechanism. We have characterized the properties of these nanosheets by an array of analytical techniques, including powder x-ray diffraction, photoluminescence measurements, and Raman spectroscopy. In all cases, we observe differences between nanosheet and bulk samples that originate from the loss of coupling between layers when going from three-dimensional to two- dimensional structures. Both CaCuSi4O10 nanosheets (derived from Egyptian blue) and BaCuSi4O10 nanosheets (derived from Han blue) have strong near-infrared luminescence properties like their bulk counterparts, yet they are amenable to modern solution processing methods. We have demonstrated ink jet printing with CaCuSi4O10 nanosheet inks, as well as the fabrication of nanosheet-based papers. Potential applications for these materials include NIR-based biomedical imaging and security inks.

Professor Tina Salguero has extensive experience in the preparation and characterization of molecules and materials, ranging from organometallics to nanomaterials and including both organic and inorganic substances. Since arriving at the University of Georgia in 2010, she has established a research program based on two-dimensional inorganic nanomaterials that are synthetically challenging targets and have the potential for remarkable properties. In her previous position at HRL Laboratories, LLC (Malibu, CA), Prof. Salguero focused on the development of energy technologies for commercial and military applications, including hydrogen storage with metal hydride materials, microbial fuel cells, and novel PEM fuel cell materials.    Prof. Salguero was a postdoctoral researcher at the University of California, Santa Barbara, where she was supported by a Damon Runyon Cancer Research Foundation Fellowship. Prof. Salguero received her Ph.D. in chemistry from the California Institute of Technology as a U.S. Department of Defense National Defense Science and Engineering Graduate Fellow. She received her B.A. in chemistry from Columbia University. Prof. Salguero’s accomplishments include several national-level honors, most recently a Department of Energy Early Career Award.

Nano@Tech

Sharing Our Knowledge, Shaping the Future

Nano@Tech is an organization comprised of professors, graduate students and undergraduate students from the Georgia Tech and Emory campuses and professionals from the corresponding scientific community who are interested in Nanotechnology.

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Meetings are held on the second and fourth Tuesday of the month at noon, during the academic year. This meeting will be held in Parker H. Petit Room 1128.

Pizza lunch is provided, however we ask that you limit yourself to two slices so as many attendees as possible can be accommodated.