Microfluidic synthesis of silica-based biomaterials for ions and molecules adsorption. (A) Droplet flow synthesis of hollow silica microspheres for iodine adsorption. Reproduced with permission from ref.87. (B) Droplet synthesis of porous photonic encoding magnetized silica microspheres (PEMSMs) for OTA enrichment. Figures i-iv are carbonylated surfaces of PEMSMs, physical adsorption of OTA aptamer on the surface of PEMSMs, covalent bonding of OTA aptamer on the surface of PEMSMs with NHS/EDC activation, and covalent bonding of OTA aptamer with biotin-streptavidin link system on the surface of PEMSMs, respectively. Reproduced with permission from ref.118. (C) Microfluidic synthesis of two-dimensional hollow sandwich-like mesoporous silica nanosheet with water ripple-like surface for on-chip enrichment of Rhodamine B, BSA-FITC, and Doxorubicin. Reproduced with permission from ref.60.