Figure 1
From: Multilayer fabrication of unobtrusive poly(dimethylsiloxane) nanobrush for tunable cell adhesion
Fabrication scheme and material characteristics for the PDMS nanobrush layer on a glass substrate. (a) Schematic process and corresponding chemical structures. The PDMS nanobrush layer is fabricated on a glass substrate using an amine-epoxy reaction (①: Oxygen plasma, ②: 3-aminopropyl trimethoxysilane (APTES), ③: monoglycidyl ether-terminated PDMS (n ~ 6,000) at 80 °C for 4 hours). (b) Attenuated total reflectance (ATR) and infrared (IR) spectra of bulk PDMS (black) and PDMS nanobrush (red). (c) High-resolution X-ray photoelectron spectroscopy (XPS) Si2p (top) and C1s (bottom) narrow spectrum for bulk PDMS (black) and PDMS nanobrush (red). (d) Water contact angle for the glass substrate, PDMS nanobrush, and bulk PDMS. All measurements were replicated on at least three different samples (nmin = 3) and error bars denote standard deviations (SD) of the means.
