Nanofibrillated cellulose-based superhydrophobic coating with antimicrobial performance

Abstract

Superhydrophobic coatings have been widely developed to endue the materials with antibacterial, selfcleaning, antiseptic, and some other multi-functionalities. Fluorochemicals are the most commonly used superhydrophobic coatings, however, the released toxic substances from uorinated polymers are a signi cant source of water pollution and even a threat to human health. With the increasingly great attention to the environment, it is imperative to exploit green and effective hydrophobic coatings. Here, a nano brillated lignocellulose-based multifunctional superhydrophobic coating (NMSC) was fabricated by using an e cient silylation process from cellulose, tetraethyl orthosilicate, and cetyl trimethoxysilane. Microscopic, chemical structural, and thermal properties analyses revealed that the NMSC has nano roughness, low surface energy, and good thermal stability. More importantly, the NMSC displayed an unprecedented hydrophobic and self-cleaning performance (water contact angle ~ 165°). The NMSC superhydrophobic coating can realize long-term effective barriers to many uids, including strong acid (pH = 1), strong alkali (pH = 13), alcohols, alkanes, esters, and some other organic solvents. Moreover, the NMSC also showed good antibacterial properties with E. coli and S. aureus. This work not only improved the high-value application of lignocellulose but also provides a good pathway for the development of ecological and sustainable multi-functional coatings.

Micro-/nanofiber-coupled superhydrophobic and conductive textile for underwater wearable strain sensors with full-scale human motion detection ability

“…For example, Wang et al 36 deposited chemically modified SiO 2 nanoparticles on MXene/Au nanoparticles/waterborne polyurethane composite coating, achieving a superhydrophobicity surface with a contact angle of 153°. Ye et al 37 fabricated a nanofibrillated cellulose-based multifunctional superhydrophobic coating using an efficient silylation process, and it achieved excellent self-cleaning performance. Shao et al 38 prepared a superhydrophobic coating by polytetrafluoroethylene composited with graphene, and it also exhibited good adhesion, corrosion resistance, and self-cleaning performance.…”

Preparation and Properties of Modified Lignin/Triphenol Epoxy Composite Coatings for Superhydrophobicity and Corrosion Protection

“…This is because the hydroxyl groups on the surface of lignin were replaced by hydrophobic groups, the adsorption force to water molecules was reduced, and the surface water content was correspondingly reduced . Due to the fact that silane chains have stronger thermal stability than hydroxyl groups, , pyrolysis of the modified lignin started at around 260 °C. The carbonization stage started after 540 °C due to the decomposition of silane chains grafted on the surface of the lignin.…”

Anticorrosion Properties of Robust and UV-Durable Poly(vinylidene fluoride-co-hexafluoropropylene)/Carbon Nanotubes Superhydrophobic Coating

“…Some existing synthetic applications fall into this category. A reliable antiwetting behavior of surfaces over extended periods is essential for many industrial applications of nonwetting surfaces. − Wear, erosion, corrosion, and oxidation are some of the degradation processes that surfaces experience in industrial applications. − In addition, UV degradation is another challenge for SHCs. During the day, sunlight produces a large dose of UV light, generating free radicals on polymeric surfaces .…”