The contamination of heavy metal ions in water resources poses a threat to both human health and the environment. Fluorescent sensing technologies based on rare earth elements can be widely applied for the accurate detection and quantitative analysis of metal ions. A fluorescent nanofiber membrane material with sensitivity to copper ions was developed. The Eu(TTA) 3 ·2H 2 O complex was formed through a complexation reaction between europium (Eu) and 2-thenoyltrifluoroacetone (TTA). This complex was then co-spuned with a solution of PEG-modified PET (GPET) using the centrifugal electrostatic spinning method to create a fluorescent PET fiber membrane (GPET@Eu-NFM). Results show that the fluorescence intensity of GPET@Eu-NFM is enhanced compared to the Eu(TTA) 3 ·2H 2 O complex. As the concentration of the copper ion solution increases, the fluorescence intensity of the film presents a linear decreasing trend, and it also has a linear relationship with pH. This indicates that the fluorescent polyester fiber membrane exhibits dual responsiveness to copper ions and pH. An effective, quick, and convenient method for the monitoring and analysis of copper ions can be proposed by utilizing the fluorescence quenching phenomenon observed when the super hydrophilic surface of functionalized GPET@Eu-NFM comes into contact with copper ions.
Xiong Zheng,Xuzhen Zhang,Jiaoxue Shi,Zhichao Yang,Shuyang Li,Yu Zhang,Xiuhua Wang
Fluorescent materials are extensively utilized in anti-counterfeiting and security applications, and surface cleanliness is crucial for preserving their functionality. This study presents a novel hydrophobic fluorescent coating characterized by a morphology in which particles are semi-embedded and evenly dispersed within the primer. The coating was developed using an innovative method that involves spraying hydrophobic silica onto a microscopically dissolved fluorescent polyethylene terephthalate (PET) primer. The coating demonstrates superior hydrophobicity, with a water contact angle (WCA) of 165.0° ± 5.0° and a sliding angle of 3.0°, as well as an outstanding luminous intensity 541.4 mcd/m 2 . Due to strong primer and semi-embedded particle binding, the coating shows good durability. After 80 wear treatment, the hydrophobic properties of the fluorescent coating were largely maintained. After 32 days of exposure to 0.68 W/m 2 ultraviolet light, the contact angle decreased from 160.0° to 154.7° (with a sliding angle of 8.0°). In addition, the firmness, transparency, and self-cleaning function of the coating can be effectively maintained. The coating in this work has solved the inherent problems of functionality, hydrophobicity, and durability in the coating field, and has a wide range of applications including flexible fabrics, road safety field, and building exterior materials.
危险品化学品经营许可证（带存储）