Figure 4.

(a) Fused poly (D, L-Lactide) (PDLA) microspheres coated with TiO₂ nanoparticles at 90 °C for 45 min and (b) detail of the pore size gradient of the scaffold obtained by the heat sintering method [49]. Figure reprinted from Nanomedicine: Nanotechnology, Biology and Medicine, 13, Morteza Rasoulianboroujeni, Mostafa Yazdimamaghani, Payam Khoshkenar, Venkata Raveendra Pothineni, Kwang Min Kim, Teresa A. Murray, Jayakumar Rajadas, David K. Mills, Daryoosh Vashaee, Keyvan Moharamzadeh, Lobat Tayebi, From solvent-free microspheres to bioactive gradient scaffolds, 1157–1169, 2017, with permission from Elsevier.