Negatively Charged Carbon Nanodots with Bacteria Resistance Ability for High‐Performance Antibiofilm Formation and Anticorrosion Coating Design

Abstract

Multifunctional coatings, especially those with simultaneous antibiofilm formation and anticorrosion properties are of great significance for the marine industry. Inspired by the function of fish mucus of blackhead fish, a biological epidermal secretion with negative surface potential that protects blackhead fish from colonization of microorganisms, a concept is introduced to use negatively charged carbon nanodots (CDs) as a secure and economical dual‐functional additive to prepare protective coatings. The prepared CDs with strong negative surface potential initiate robust antibiofilm formation (antiadhesion and antibacteria) and anticorrosion properties (about 60 days' durability in seawater) of polymeric coatings. The incorporated CDs with negative surface potential take effect in the following ways: 1) suppressing bacterial adhesion by virtue of strong electrostatic repulsion; 2) sterilizing anchored bacteria via destroying bacterial cell walls; 3) impeding electron ejection from the metallic surface; and 4) blocking aggressive species (H2O and O2) by narrowing the microchannels. This work provides a new train of thought propelling the development of potential materials for industrial and engineering applications.

Carbon Dots: A New Type of Carbon-Based Nanomaterial with Wide Applications

“…Besides being carriers, CDs themselves behave with therapeutic performances such as antibacterial activity, ,− anticancer activity, , antiviral activity, , and antioxidant activity. − …”

Carbon Nanodots in Photodynamic Antimicrobial Therapy: A Review

“…These effects are discussed in a review by Anand et al [ 31 ] and have been mentioned by others [ 61 , 62 , 63 , 64 , 65 , 66 ]; they include cell well disruption [ 61 , 62 , 63 , 64 ] and DNA/RNA damage [ 61 , 65 , 66 ] to name a few. Nonetheless, studies demonstrate significant bactericidal capabilities from photosensitization using carbon dots; strains studied by the reports summarized herein are compiled in Figure 4 d, including multi-drug resistant (MDR) E. coli for one study and methicillin-resistant Staphylococcus aureus (MRSA) as well [ 19 ].…”

Stimuli-Responsive Lysozyme Nanocapsule Engineered Microfiltration Membranes with a Dual-Function of Anti-Adhesion and Antibacteria for Biofouling Mitigation

“…The zeta potential was observed to become negative after incorporation of B/C@L nanocapsules, corresponding to the high negative charge of nanocapsules. Since the bacteria are generally negatively charged at pH from 4 to 9, the negatively charged membrane can induce an electric repulsive force to limit bacterial attachment and deposition, thereby resulting in less biofouling.…”