Supporting Information for Enhanced Trapping Efficiency in Acid-treated Silica Nanostructures Subhasree Banerjee, Surajit Maity, Anindya Datta* Department of Chemistry Indian Institute of Technology Bombay Powai, Mumbai 400 076, India Phone: +91 22 2576 7149, Fax: +91 22 2570 3480 e-mail: anindya@chem.iitb.ac.in