Correction: Co-nonsolvency of PNiPAM at the transition between solvation mechanisms

Abstract

Correction for ‘Co-nonsolvency of PNiPAM at the transition between solvation mechanisms’ by I. Bischofberger et al., Soft Matter, 2014, 10, 8288–8295.

---

Some labels of the x-axes in Figures 3 and 4 were incorrectly rendered. Please see the corrected figures below.

Fig. 3 Radius of gyration R_g of PNiPAM microgels at a concentration of c = 2.4 × 10⁻⁶ g ml⁻¹. (a) Dependence of R_g on the alcohol molar fraction X at a fixed temperature of T = 12.5 °C for water–methanol mixtures (black pluses) and water–ethanol mixtures (red crosses). (b) Temperature dependence of R_g in the low X-regime: X = 0 (blue triangles), X_MeOH = 0.08 (black squares) and X_EtOH = 0.06 (red circles). PNiPAM exhibits a coil-to-globule transition that coincides with the LCST, which is denoted by arrows. (c) Temperature dependence of R_g in the high X-regime: X_MeOH = 0.37 (black squares) and X_EtOH = 0.275 (red circles). The arrows indicate the critical solution temperatures, corresponding to a LCST for X_MeOH = 0.37 and to an UCST for X_EtOH = 0.275. Dotted black and red lines denote respectively the magnitudes of the microgel radii in pure methanol and ethanol. (d) Reporting R_g as a function of the reduced temperature ΔT = T_c − T collapses all data obtained for X < X*. As in (a) the black pluses and red crosses denote the data obtained at a fixed temperature of T = 12.5 °C and varying X. As in (b) the full symbols denote the data obtained at fixed X and varying temperatures.

Fig. 4 (a–c) Dependence of the critical solution temperature T_c on solvent composition for a fixed concentration and molecular weight of a linear PNiPAM, c = 10⁻² g ml⁻¹ and M_v = 39 000 g mol⁻¹ (PNiPAM 1). The solvent mixtures are water–methanol (black squares), water–ethanol (red circles), water–isopropanol (purple triangles up) and water–propanol mixtures (blue triangles down). Full and open symbols denote respectively LCST and UCST. (d–f) Dependence of PNiPAM microgel dimensions on solvent composition at a fixed temperature of T = 12.5 °C in water–methanol (black pluses) and water–ethanol mixtures (red crosses). For both series of experiments reporting the data as a function of X/X* leads to a collapse of the different data sets in the low X-regime, while reporting the data as a function of ϕ_a leads to a collapse of the different data sets in the high X-regime.

The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.

---