RESUMO
A single step, scalable and green strategy has been developed to obtain reduced graphene oxide layers in water dispersion through nanosecond laser pulse irradiation of carbon targets. The layers spontaneously migrate at the water-air interface, forming sheets of several tens of micrometers and show intense ultraviolet photoluminescence. This unique condition offers an intriguing environment where opposing dielectric media meet and can be used in all those processes where molecular interactions such as hydrogen bonding and electrostatic interactions are greatly enhanced.
RESUMO
By a simple process poly(amido-amine) chains have been grafted on the surface of poly(vinyl chloride). Grafted poly(vinyl chloride) is able to adsorb heparin, thus providing potentially non-thrombogenic surfaces. The grafting of poly(amido-amine), and the heparin adsorption have been studied by ESCA. It has been found that the total amount of grafted poly(amido-amine) depends on the molecular weight of the poly(amido-amine) used in the grafting reaction, but the amount of heparin adsorbed on the grafted material is relatively independent of the length of the poly(amino-amine) grafted chains.
