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3D-printed glass structures. (a) Final 2-step procedure of manufacture of fused silica glass from 3D-printed yellow scaffold mixture of HEMA and silica nanoparticles (Reprinted with permission from ref 103 Copyright 2017 Springer). (b) Printed glass doped with TiO2 to modify the refractive index. reservoirs (Reprinted with permission from ref 105 Copyright 2018 Wiley).
