Dense non-aqueous phase liquids (DNAPLs), such as trichloroethylene (TCE), are a persistent source of mobile contamination at thousands of sites in the U.S. Current remediation technologies such as “pump and treat” only target the dissolved phase plume, leaving the majority of the source pollutant intact. Nanoscale zero valent iron (NZVI) particles have been shown to effectively dechlorinate TCE, but their poor colloidal stability and transport properties limit their effectiveness as in situ treatment agents. Modifying the surfaces of these nano-iron particles could allow for an aggressive source-zone targeting approach that should expedite site clean and lower cleanup costs. Using atom transfer radical polymerization (ATRP), we have synthesized poly(methacrylic acid)-b-poly(methyl or butyl methacrylate)-b-poly(styrene sulfonate) triblock copolymers as NZVI coatings. Adsorption of these triblock copolymer amphiphiles on NZVI significantly enhances NZVI colloidal stability. Using quartz crystal microgravimetry (QCM) and ellipsometry, we monitor the adhesion of NZVI particles with several different block copolymer surface modifiers on to silica under varying ionic strength conditions that mimic those found in groundwater. In addition to stabilizing colloidal suspensions, the polymeric coatings effectively eliminate NZVI adhesion to silica. The effect of silica hydrophobization on nano-iron adhesion will also be addressed to estimate the ability of the block copolymer coatings to promote NZVI adhesion on DNAPL (oil)/water interfaces.