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Figure 4 | Nanoscale Research Letters

Figure 4

From: Electrostatic complexation of polyelectrolyte and magnetic nanoparticles: from wild clustering to controllable magnetic wires

Figure 4

D H versus I S during the dilution process. Ionic strength dependence of the hydrodynamic diameter D H for a dispersion containing γ-Fe2O3-PAA2K particles and oppositely charged PTEA11K-b-PAM30K (black closed symbols), PDADMAC (red closed symbols), and PEI (blue closed symbols) at Z = 0.3, Z = 1, and Z = 7. At Z = 1, with decreasing I S , an abrupt transition was observed at a critical ionic strength at 0.38 ± 0.01 M, 0.54 ± 0.01 M, and 2.3 ± 0.01 M for the solution containing PTEA11K-b-PAM30K, PDADMAC, and PEI, respectively. At Z = 0.3 and Z = 7, their critical ionic strength was found to be 0.40 ± 0.01 M, 0.54 ± 0.01 M, 2.5 ± 0.01 M, 0.49 ± 0.01 M, and 2.1 ± 0.01 M respectively. At Z = 1, because of their maximum complexation, the size of clusters based on PDADMAC and PEI are superior to 1 μm at the end of dilution, which induced a macroscopic phase separation (marked by the empty symbols and patterned area).

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