Fractal Characteristics of Porosity of Electrospun Nanofiber Membranes

Table 2

Results of porosity of the electrospun nanofiber membrane.

Number of samples	Threshold		Porosity (%)		Ratio
	Whole-image average gray value	Image binarization selected threshold	Mercury intrusion method	Image processing	Image selection threshold/whole-image average gray value	Mercury intrusion method/image processing
5	116.357832	98	83.0	33.9032	0.8508	2.4461
11	119.866425	100	66.1	28.2820	0.8509	2.3126
19	106.131277	80	83.5	33.7828	0.8480	2.4717
20	127.836432	115	85	27.9989	0.8527	2.8793
28	115.542275	98	78.8	30.1811	0.8482	2.6109
Average					0.8501	2.5432