Table 2.

The key structural and interfacial characteristics of S. aureus and E. coli O157:H7 used in this study.

Bacteria	S. aureus	E. coli O157:H7
Type	Gram-positive	Gram-negative
Dimensions (µm)	D: 0.72 ± 0.04 (round-shaped)	W: 0.98 ± 0.15; L: 2.34 ± 0.19 (rod-shaped)
Contact angle of water (°)	33.2 ± 1.8	30.7 ± 2.8
Contact angle of DIM (°)	40.1 ± 2.2	42.0 ± 1.0
Surface energy (mJ/m2)	67.9 ± 1.6	67.1 ± 1.2
Zeta potential (mV)	−37.1 ± 0.6	−12.7 ± 0.5
Diffusion coefficient (m2/s)	3.0 × 10−13	1.8 × 10−13