1 Supporting Information Carboxylic Acid-directed Clustering and Dispersion of ZrO 2 Nanoparticles in Organic Solvents: A Study by Small-angle X-ray/Neutron Scattering and NMR Sho-Hsun Wang, Ya-Sen Sun*, Anthony Shiaw-Tseh Chiang, Hui-Fang Hung, Ming-Chou Chen and Kathleen Wood Wavenumber (cm -1 ) 500 1000 1500 2000 2500 3000 3500 4000 (a) Ac-ZrO 2 (c) AA-ZrO 2 (d) MA-ZrO 2 (e) BA-ZrO 2 (f) LOA-ZrO 2 (b) PA-ZrO 2 Figure S1. FTIR spectra of carboxylic acid modified ZrO 2