Construction of Multifunctional Hierarchical Biofilms for Highly Sensitive and Weather-Resistant Fire Warning.
Tongtong MaQianqian ZhouChaozheng LiuLiping LiChuigen GuoChangtong MeiPublished in: Polymers (2023)
Multifunctional biofilms with early fire-warning capabilities are highly necessary for various indoor and outdoor applications, but a rational design of intelligent fire alarm films with strong weather resistance remains a major challenge. Herein, a multiscale hierarchical biofilm based on lignocellulose nanofibrils (LCNFs), carbon nanotubes (CNTs) and TiO 2 was developed through a vacuum-assisted alternate self-assembly and dipping method. Then, an early fire-warning system that changes from an insulating state to a conductive one was designed, relying on the rapid carbonization of LCNFs together with the unique electronic excitation characteristics of TiO 2 . Typically, the L-CNT-TiO 2 film exhibited an ultrasensitive fire-response signal of ~0.30 s and a long-term warning time of ~1238 s when a fire disaster was about to occur, demonstrating a reliable fire-alarm performance and promising flame-resistance ability. More importantly, the L-CNT-TiO 2 biofilm also possessed a water contact angle (WCA) of 166 ± 1° and an ultraviolet protection factor (UPF) as high as 2000, resulting in excellent superhydrophobicity, antifouling, self-cleaning as well as incredible anti-ultraviolet (UV) capabilities. This work offers an innovative strategy for developing advanced intelligent films for fire safety and prevention applications, which holds great promise for the field of building materials.
Keyphrases
- carbon nanotubes
- candida albicans
- quantum dots
- visible light
- pseudomonas aeruginosa
- staphylococcus aureus
- room temperature
- air pollution
- drug delivery
- biofilm formation
- particulate matter
- cancer therapy
- high resolution
- reduced graphene oxide
- gold nanoparticles
- molecularly imprinted
- big data
- sensitive detection
- risk assessment
- deep learning
- machine learning
- health risk
- loop mediated isothermal amplification