Improving the conductivity stability of flexible conductors has a positive impact on the working performance and service life of portable electronic devices. However, designing a conductor material with both conductivity-stable and flexible performance is still not an easy task because of the conductive network damage under large deformation or high humidity conditions. Here, we surmount this challenge by developing an interfacial assembly/encapsulation integration strategy for the construction of flexible, transparent, and conductivity-stable film. Under the synergistic effect of coordination complexation and hydrogen bonding, silver nanowires (AgNWs) are sandwiched encapsulated by regenerated cellulose film (as flexible substrate) and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) nanosheets (as sealing coat). The resulting hybrid film has a robust interfacial structure and prominently stable properties. Even when subjected to harsh condition such as a high-moisture environment of 90% relative humidity and 65 °C temperature for up to 60 days, repeated bending for 500 times, peeling over 400 times or soaking in water for 30 days, the film still exhibits a high and stable conductivity, better than most previously reported values for AgNWs-based films. With this strategy as base, we demonstrate a flexible, transparent and biocompatible strain-to-electricity sensor with high working stability and performance.
Kuo Wu,Hao Wang,Zhikun Zhang,Hong Cai,Kunpeng Qian,Wenya Ma,Min Fan,Li Li
Smart packaging systems for real-time visual monitoring of food freshness play a crucial role in food safety. However, the intelligent packaging film is prepared by solution casting and extrusion moulding, the low efficacy limited the application. In this study, a pH colorimetric indicator film based on gelatin, anthocyanin and diatomite was fabricated via the industrial method of melt extrusion. The film exhibited good mechanical properties as well as excellent water resistance and antioxidant properties. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray diffraction (XRD) indicated that the fish gelatin (FG) interaction with anthocyanin/diatomite ( AD ) reduced the crystallinity and influenced the microstructure and mechanical properties of the thin film. The film exhibited high sensitivity to volatile amines with visible colour changes. When used to monitor the freshness of Litopenaeus vannamei from day 0 to 10 , the colour of the film shifted from purplish-red to brownish-yellow. Pearson correlation analysis indicated that the colour changes on films are closely related to the variations in TVB-N ( r = 0.98, p < 0.001) and pH ( r = 0.93, p < 0.01) values of L. vannamei . Therefore, the film can be utilized to monitor the freshness of L. vannamei and holds significant potential for large-scale industrial production.
Yakun Li,Pinhua Rao,Jincheng Wang,Shiqiang Song,Runkai Wang,Shihui Liu,Lei Che
All kinds of soil conditioners have been used to improve soil quality. The application of many traditional soil conditioners was limited by single performance. In this study, a novel multifunctional microspheric soil conditioner was prepared based on Arabic gum , gelatin, chitosan and β-cyclodextrin. Arabic gum and gelatin (AG-GL) microspheric carriers, which could load ferrous sulfate (FS), were synthesized via complex coagulation method. The AG-GL(FS) microspheres were covered by chitosan quaternary ammonium salt (CQAS) through single coagulation method. And β-cyclodextrin (β-CD) was used as the outermost shell to improve chemical stability of the soil conditioner by saturated solution method. Finally, the novel multifunctional microspheric soil conditioner AG-GL/CQAS/β-CD-FS was obtained and characterized by Fourier transform infrared spectroscopy , thermogravimetric analyzer, polarizing microscope, scanning electron microscope and particle size analyzer. The novel soil conditioner shows good nutrient slowly-releasing, water retention, heavy metal ions adsorption and antibacterial performances with the particle size of 14–17 μm and high thermal decomposition temperature, which has the potential application in improving soil quality.
危险品化学品经营许可证（带存储）