Probing the Binding Modes and Dynamics of Histidine on Fumed Silica Surfaces by Solid-state NMR Haley L. Swanson, a Chengchen Guo, b Michael Cao, a J. Bennett Addison a and Gregory P. Holland* a a Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Drive, San Diego CA 92182-1030, USA b Department of Biomedical Engineering, Tufts University, Medford MA 02155, USA Supporting Information Table S1. Sample abbreviations and preparation methods. Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics. This journal is © the Owner Societies 2020