Fig. 5

Raman spectra of D24 systems, pure mineral oil, and mineral oil adsorbed by D24 systems in increasingly low concentrations (a). Optical image of D24 systems after incubation with mineral oil and sedimentation (b). Raman maps of mineral oil adsorbed by a D24 micro device acquired at f = 1450 cm⁻¹ (c) and f = 2900 cm⁻¹ (d)