An advantage of the poly(S-r-limonene) oligomers is their solubility in organic solvents, facilitating use as a coating. To prepare poly(S-r-limonene) coated silica gel, 13.89 g of the oligomer was dissolved in 300 mL of dichloromethane and poured over 138.9 g of silica in a 1 L round bottom flask. The polymer was dry-loaded to the surface of the silica gel by rotary evaporation-rotating the sample while distilling the solvent at 40 °C and reduced pressure (800 mbar). The coated silica was then dried further under high vacuum to remove any remaining solvent. The product was a free-flowing orange powder (Figs 1 and S19). Examination under an electron microscope reveals no morphological differences between the coated and uncoated silica (Figs. ). Surface area of the coated silica was 273.40 m 2 /g, as determined by Brunauer-Emmett-Teller (BET) analysis of nitrogen adsorption isotherms. The uncoated silica had a measured surface area of 444.16 m 2 /g (Fig. ). The reduction in surface area for the coating sample is likely the result of the coating filling in some pores of the silica. Figure summarizes the synthesis of poly(S-r-limonene) and shows the final sorbent after dry-loading the oligomer on silica. fully soluble in organic solvents and can be coated onto silica gel using the dry loading method.