S1 Supporting Information Millifluidics for Time-resolved Mapping of the Growth of Gold Nanostructures Katla Sai Krishna, †, ∥ Chelliah V. Navin, †, ‡ Sanchita Biswas, † Varshni Singh, † Kyungmin Ham, † G. Lisa Bovenkamp, † Chandra S. Theegala, ‡ Jeffery T Miller, § James J. Spivey, ∥ Challa S. S. R. Kumar, *,†, ∥ † Center for Advanced Microstructures and Devices (CAMD), Louisiana State University, Baton Rouge, LA 70806, USA ‡ Department of Biological and Agricultural Engineering, Louisiana State University and LSU AgCenter, Baton Rouge, LA 70803, USA § Argonne National Laboratory, 9700 South Cass Avenue, CSE, Argonne, IL 60439-4837, USA ∥ Center for Atomic-Level Catalyst Design, #324, Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA Corresponding author: ckumar1@lsu.edu