Influence of Surface Wettability and Surface Charge on Microbial Adhesion of Electrospun Polyaniline Coatings

doi:10.7503/cjcu20220615

Abstract

Abstract:

The surface wettability and surface charge of the materials have a very important influence on the attachment of microorganisms to the material surfaces. In this paper， two kinds of polyaniline fiber coatings， hydrophobic and hydrophilic， were prepared on the surface of stainless steel electrodes by electrospinning. Electrochemical impedance spectroscopy was used to monitor the adhesion of Escherichia coli（E. coli） on the surfaces of the two polyaniline fiber coatings， and the results showed that the hydrophilic surface was beneficial to inhibit the adhesion of E. coli. Further， the hydrophilic surface was positively and negatively charged， respectively， by electrochemical polarization， and the bacteriostatic rate of two kinds of charge surface under different polarization times were studied by plate count method， and it was found that both positive and negative charges were beneficial to inhibit the attachment of microorganisms， and there was no significant difference between them. Moreover， under the same cathodic polarization conditions， the antibacterial properties of hydrophilic and hydrophobic polyaniline fiber coatings were not much different， indicating that the effect of electrochemical polarization on the inhibition of bacterial adhesion by electrospun polyaniline coatings is greater than that of surface wettability.

Key words: Surface wettability, Surface charge, Escherichia coli, Electrochemical impedance spectroscopy, Bacteriostatic rate

CLC Number:

O633

TrendMD:

BA Didi, ZHAO Haizhou, ZHANG Zhiming, YU Liangmin. Influence of Surface Wettability and Surface Charge on Microbial Adhesion of Electrospun Polyaniline Coatings[J]. Chem. J. Chinese Universities, 2023, 44(4): 20220615.

Figures/Tables 14

References 28

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Polarization time/min	Stainless steel		PANI⁃PS coating		PANI⁃PS⁃PMMA coating
Polarization time/min	R_ct/（Ω·cm²）	Error（%）	R_ct/（Ω·cm²）	Error（%）	R_ct/（Ω·cm²）	Error（%）
0	3631	0.05880	2510	0.05910	2820	0.09873
10	4039	0.09369	3131	0.04220	2996	0.09898
20	5059	0.07569	3482	0.08470	3075	0.09013
30	5328	0.04640	3964	0.05840	3146	0.09304
40	5678	0.05633	4187	0.09220	3220	0.09938
50	6067	0.04403	4199	0.065010	3288	0.09626
60	7506	0.06595	4257	0.08050	3532	0.07072
80	7809	0.03907	4270	0.06660	4077	0.08332
120	7955	0.04920	4279	0.03706	4099	0.09698
150	8013	0.04930	4582	0.09720	4122	0.06966
180	8407	0.05910	4942	0.01258	4549	0.09638
240	8773	0.07961	5401	0.09760	4632	0.09015
300	9561	0.07645	5457	0.03038	5007	0.06742

Polarization time/min	Stainless steel		PANI⁃PS coating		PANI⁃PS⁃PMMA coating
Polarization time/min	R_ct/（Ω·cm²）	Error（%）	R_ct/（Ω·cm²）	Error（%）	R_ct/（Ω·cm²）	Error（%）
0	3631	0.05880	2510	0.05910	2820	0.09873
10	4039	0.09369	3131	0.04220	2996	0.09898
20	5059	0.07569	3482	0.08470	3075	0.09013
30	5328	0.04640	3964	0.05840	3146	0.09304
40	5678	0.05633	4187	0.09220	3220	0.09938
50	6067	0.04403	4199	0.065010	3288	0.09626
60	7506	0.06595	4257	0.08050	3532	0.07072
80	7809	0.03907	4270	0.06660	4077	0.08332
120	7955	0.04920	4279	0.03706	4099	0.09698
150	8013	0.04930	4582	0.09720	4122	0.06966
180	8407	0.05910	4942	0.01258	4549	0.09638
240	8773	0.07961	5401	0.09760	4632	0.09015
300	9561	0.07645	5457	0.03038	5007	0.06742

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