Dawn Bonnell is a notable figure in the field of materials science and engineering, particularly recognized for her work in nanotechnology and surface science. She has contributed significantly to the understanding of nanoscale materials and their properties. Bonnell is often associated with her role in academia, where she has held professorships and leadership positions at universities, including the University of Pennsylvania.
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Dawn Bonnell coauthored a quantitative analysis of piezoresponse force microscopy on ferroelectric surfaces. A signal from a biased probe can contain both electrostatic forces and a genuine electromechanical response; the observed contrast does not uniquely identify one mechanism. The analysis combines tip-field calculations and contact mechanics to map regimes where different contributions dominate. Comparing these predictions with temperature-dependent barium titanate domain measurements helps determine when the microscope can report material properties quantitatively.[ref]
Imaging mechanism of piezoresponse force microscopy of ferroelectric surfaces by Sergei V. Kalinin and Dawn A. Bonnell. Physical Review B 65, 125408 (2002), abstract and contrast-mechanism maps
Portrait of Dawn Bonnell
. Douglas A. Lockard / Science History Institute. CC BY-SA 3.0, via Wikimedia Commons. Source.