“…Hydrophilic polymers can be useful at the surface of NPs by adsorption of surfactants or by utilize of block copolymers or branched copolymers (Stolnik et al, 1995;Storm et al, 1995;Torchilin and Trubetskoy, 1995;Mahapatro and Singh, 2011). Surface chemistry Analysis is determined by X-ray photoelectron spectroscopy (Mu and Feng, 2003;Si-Shen et al, 2004;Kim et al, 2005), Fourier transform infrared spectroscopy (Li et al, 2001;Choi and Kim, 2007;Yang et al, 2007) and Nuclear magnetic resonance spectroscopy (Li et al, 2001;Avgoustakis et al, 2002;Cheng et al, 2007;Dinarvand et al, 2011).…”