All mixtures, both in-situ and ex-situ, were mixed with Ultra Turrax for 30 min before sheet preparation to make them homogeneous. The total volume of the aqueous dispersions was 9 L to achieve long dewatering times and secure the homogeneity of the sheets. The dispersions were vacuum filtered through poly(vinylidene fluoride) filters (PVDF, pore diameter 0.65 μm, Merck) to minimize the material losses. The papers were dried at 93 °C for 10 min under the pressure of 1 bar.