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SEM microstructure of MPs gels induced by different combinations of pressure and heating; scale bars are 5 μm. (A). 0.1 MPa, 75 °C, 30 min; (B). 200 MPa, 20 °C, 30 min, then 0.1 MPa, 75 °C, 30 min; (C). 400 MPa, 20 °C, 30 min, then 0.1 MPa, 75 °C, 30 min; (D). 200 MPa, 75 °C, 30 min; (E). 400 MPa, 75 °C, 30 min. This figure was cited from reference [44].
