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Schematic of the fabrication procedures for (a1,a2) preparing D-phase containing the (b) TiO2 with a bandgap of 3 ev (Tauc plot) and (c1) PMMA fiber extrusion, (c2) dip coating of extruded PMMA fiber and (c3) phase conversion for M-phase fibers. (d) Differential scanning calorimetry (DSC) of polymethyl methacrylate (PMMA) raw material. (e) Back-to-back thermogravimetric analysis (TGA) conducted to quantify TiO2 retention after wet phase inversion.
