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. 2021 Mar 11;121(8):4561–4677. doi: 10.1021/acs.chemrev.0c00752

Figure 8.

Figure 8

(A) Schematic representation displaying the preparation process of pore size gradient by a centrifugation technique. Reprinted with permission from ref (175). Copyright 2007 American Chemical Society. (B) Schematic diagrams illustrating the fabrication of PCL roughness-gradient. Reprinted with permission from ref (181). Copyright 2014 Elsevier, Ltd. (C) Schematic drawing of the dip-coating process to prepare particle gradient. Reprinted with permission from ref (186). Copyright 2007 American Chemical Society. (D) Schematic diagram for producing a density gradient of microparticles by electrospray method. Reprinted with permission from ref (189). Copyright 2010 WILEY-VCH.