| 초록 |
We describe two strategies for controlling over the thermally responsive wettability on nanoporous organic/inorganic multilayer films. First, for “grafting to” approach, a poly(allylamine hydrochloride)-g-poly(N-isopropylacrylamide) (PAH-g-PNIPAAm) copolymer was synthesized by grafting of PNIPAAm having carboxylic groups at one end onto PAH in which the PAH acts as the cationic polyelectrolyte. In a second approach, SI-ATRP method was used to graft PNIPAAm to rough silica nanoparticle substrates. In this method, reversible switching between superhydrophilicity and superhydrophobicity can be achieved in a narrow temperature range of about 10℃, which is considered to result from the combined effect of the chemical variation of the surface and surface roughness. Such switchable surfaces may have wide applications in functional textiles, intelligent microfluidic switching, controllable drug release and thermally responsive filters. |
