Fig. 6
From: Hybrid nanogels and their roles in eliminating soot stains from historical paper manuscripts
SEM micrograph of aged un-cleaned paper sample before treatment (A); B Cleaned sample with low viscosity TiO2/carbopol hybrid nanogel. C Aged cleaned sample with low viscosity TiO2/carbopol hybrid nanogel. D Cleaned sample with high viscosity TiO2/carbopol hybrid nanogel. E Aged cleaned sample with high viscosity TiO2/carbopol hybrid nanogel. F Cleaned sample with low viscosity ZnO/carbopol hybrid nanogel. G Aged cleaned sample with low viscosity ZnO/carbopol hybrid nanogel. H Cleaned sample with high viscosity ZnO/carbopol hybrid nanogel. I Aged cleaned sample with high viscosity ZnO/carbopol hybrid nanogel. J Cleaned sample with low viscosity Fe3O4/carbopol hybrid nanogel. K Aged cleaned sample with low viscosity Fe3O4/carbopol hybrid nanogel. L Cleaned sample with high viscosity Fe3O4/carbopol hybrid nanogel. M Aged cleaned sample with high viscosity Fe3O4/carbopol hybrid nanogel