Fig. 1

a Schematic illustration of preparing an nFH dispersion. b An scanning electron microscopy image of electrospun PVA-PAA nanofibers. Confocal microscopic image of c crosslinked PVA-PAA nanofibers, d nFHs, and e) homogenized nFHs. All scale bars denote 3 μm. f Diameters of nanofibers in b to e). g Photographic images of precipitated nFH dispersions after centrifugation. h Plots of optical transmittance of nFH dispersions after centrifugation as a function of height from the cuvette bottom. g-force was varied from 2000 to 4500 rpm with the increment of 500 rpm