Material Characterization.
(A) The XRD patterns of BaTiO3, BM (BaTiO3/MWCNTs), MC (MWCNTs/Col), and BMC (BaTiO3/MWCNTs/Col) nanocomposite membranes are presented. (B) Raman spectra of BM, MC, and BMC nanocomposite membranes. (C) The water contact angle of various membranes; n = 6. (D) SEM images of BM, MC, and BMC nanocomposite membranes at different magnifications. (E) Young's modulus of the various membranes; n = 6. (F) Nanoindentation hardness of BM, MC, and BMC nanocomposite membranes; n = 6. (G) The piezoelectric coefficient d33 for the membranes; n = 3. (H) The output voltage of various membranes with or without LIPUS. L, LIPUS stimulation; *P < 0.05, ****P < 0.0001.