With the expansion of the security market, the demand of the anti-counterfeiting technology is becoming more and more big, and the requirement of the anti-counterfeiting technology is becoming more and more is also high. In this paper, a simple summary of the application of fluorescent material in the anti-counterfeiting field is finished. And analysis of the current situation and development tendency of fluorescent material at home and abroad is given in this paper.
Using starch as the stabilizing agent, glucose as reducing agent, nano-size silver particles colloidal sols have been synthesized via ultrasonic irritation in aqueous solution. The synthesis process is completely green and the colloidal sols are safe to environment and human, and can be used as antibacterial agent in biology, medicine, food packaging and hauseware fields. The synthesis technology parameters for the silver particles with diameter of 15 to 45 nm, such as the ultrasonic power, reaction time, reaction temperature, concentrations of silver nitrate and capping agent were determined and discussed. The typical colloidal was characterized by ultraviolet-visible spectroscopy (UV-Vis), transmission electron microscope (TEM), X-ray powder diffractometer (XRD) and Zeta Sizer Nano Series.
Using starch as the stabilizing agent, glucose as reducing agent, nano-size silver particles colloidal sols have been synthesized via ultrasonic irritation in aqueous solution. The nanoparticles size distribution in typical colloidal sol is from 15 to 45 nm. The silver nanoparticles-PE blend film with silver content of 86 ppm was prepared by mixing silver nanoparticles colloids sol with the PE master batch and then by film blowing. The silver nanoparticles-PE blend film and the prepared nano-silver sol show effective antibacteial activity to the Staphylococcus aureus and Escherichia coli. The pear fruit package application of the silver nanoparticles-PE blend film has demonstrated that the film has effective fresh preservation ability for the packaged fruits and vegetables.
Metal packaging waste accounts for about 10% of total packaging waste and possesses the quality of high resource-consumption and high environmental pollution. This paper presents: 1) the design of the production process, based on the core of easy recycling in the metal packaging life cycle; 2) improve the legal framework, strengthen publicity and management, further refine metal packaging waste classification, encourage people participate in recycling through interest, set up model demonstrations; 3) through scientific and technological innovation, advance recycling level to improve the current situation of low recovery, low utilization level.
A paste with as low as 300°C sintering temperature was prepared by using nano silver particles and nitrocellulose ethyl acetate solution. The rheological and thixotropic behaviors of the typical paste were characterized and their effects on the screen printing ability were analyzed in details. The paste demonstrates a typical shear thinning rheological behavior and thixotropic of pseudoplastic fluid. The apparent viscosity decreased rapidly with the increase of the shear rate. The paste is proper for the manufacturing electrical components at a low sintering temperature as low as 300°C.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.