Abstract: The invention provides a silver-plated conductive nylon fiber and a preparation method thereof. The method includes: immersing a nylon fiber in an aqueous solution containing a polyphenolic compound at 60° C. to 70° C., adding a water-soluble oxidant into the solution, continuously reacting at 70° C. to 80° C., and obtaining a polyphenol grafted nylon fiber, where the polyphenolic compound contains a catechol group; immersing the polyphenol grafted nylon fiber into a solution containing silver ions at 15° C. to 25° C. for reaction, and raising the temperature to 70° C. to 80° C. for continuous reaction to obtain a surface-activated nylon fiber; and carrying out chemical silver plating treatment on the surface-activated nylon fiber to obtain the silver-plated conductive nylon fiber. The method does not require a heavy metal sensitizer and therefore is non-toxic and environment-friendly, and the fiber strength is maintained.

Abstract: The invention provides a silver-plated conductive nylon fiber and a preparation method thereof. The method includes: immersing a nylon fiber in an aqueous solution containing a polyphenolic compound at 60° C. to 70° C., adding a water-soluble oxidant into the solution, continuously reacting at 70° C. to 80° C., and obtaining a polyphenol grafted nylon fiber, where the polyphenolic compound contains a catechol group; immersing the polyphenol grafted nylon fiber into a solution containing silver ions at 15° C. to 25° C. for reaction, and raising the temperature to 70° C. to 80° C. for continuous reaction to obtain a surface-activated nylon fiber; and carrying out chemical silver plating treatment on the surface-activated nylon fiber to obtain the silver-plated conductive nylon fiber. The method does not require a heavy metal sensitizer and therefore is non-toxic and environment-friendly, and the fiber strength is maintained.

Abstract: The present invention provides a method for preparing a conductive silk fibroin material, comprising the steps of: (1) preparation of a high-molecular-weight silk fibroin solution; (2) preparation of an insoluble silk fibroin material; (3) surface treatment of the silk fibroin material; (4) oxidation of the silk fibroin material; and (5) in-situ oxidative polymerization of 3,4-ethylenedioxythiophene on the surface of the graft-modified silk fibroin material. In the present invention, a conductive composite film grafted with 3,4-ethylenedioxythiophene on the surface is prepared, and the surface resistance is 100 to 5000 ohms. The preparation process is simple and mild, and the obtained conductive silk fibroin material can be used as a flexible electronic device, especially as a device for measuring human blood glucose level and heartbeat.

Abstract: The low-field nuclear magnetic resonance (LF-NMR) is used in the design of a formula of a water-based printing ink and selection of the water-based printing ink or a wetting agent. The water-based printing ink or the wetting agent is quickly selected through the inversion data of an LF-NMR transverse relaxation time (T2). By using LF-NMR to detect the distribution of water in the water-based printing ink or wetting agent, the water-based printing ink is quickly detected in real-time and a high-quality water-based printing ink is selected, which contributes to the design and development of water-based printing inks. The state of water in the ink also is adjusted based on the relationship between the distribution state of water in the printing ink and the definition of the printed pattern, thereby ensuring the definition of the printed pattern.

Abstract: The present invention provides a method for preparing a conductive silk fibroin material, comprising the steps of: (1) preparation of a high-molecular-weight silk fibroin solution; (2) preparation of an insoluble silk fibroin material; (3) surface treatment of the silk fibroin material; (4) oxidation of the silk fibroin material; and (5) in-situ oxidative polymerization of 3,4-ethylenedioxythiophene on the surface of the graft-modified silk fibroin material. In the present invention, a conductive composite film grafted with 3,4-ethylenedioxythiophene on the surface is prepared, and the surface resistance is 100 to 5000 ohms. The preparation process is simple and mild, and the obtained conductive silk fibroin material can be used as a flexible electronic device, especially as a device for measuring human blood glucose level and heartbeat.

Abstract: The present invention relates to use of low-field nuclear magnetic resonance (LF-NMR) in the design of a formula of a water-based printing ink and selection of a water-based printing ink or a wetting agent. The present invention quickly selects a water-based printing ink or a wetting agent through the inversion data of an LF-NMR transverse relaxation time (T2). By using LF-NMR to detect the distribution of water (free water, hydrogen bonded water and bound water) in the water-based printing ink or wetting agent, the present invention achieves rapid real-time detection and selects a high-quality water-based printing ink, which contributes to the design and development of water-based printing inks. The present invention can also adjust the state of water in the ink based on the relationship between the distribution state of water in the printing ink and the definition of the printed pattern, thereby ensuring the definition of the printed pattern.