Shrink packaging is a packaging way which is widely used in the field of modern goods packaging. Its packaging forms, the development of new technology and application field ware summarized. Its outstanding features, such as transparent and intuitive, efficient, seal and moistureproof, flexible and convenient operation ware analyzed. A broader development prospect of shrink packaging used in various industry products in the form of sales packaging and transport packaging was pointed out.
Abstract. After nanguo pear respectively were dealt with water to wash, base paper packaging and nano-TiO 2 /chitosan coated antibacterial paper packaging, and stored for some time, its sensory index and physiological index were measured and made comparative analysis. The determination results based on sensory index indicated that: nanguo pear packaged in coated antibacterial paper are small weight loss rate, moderate moisture, and can reduce the yellow index of fruit and prevent fruit rot. The determination results based on physiological indexes indicated that: the antibacterial effect of coated antibacterial paper is superior, can effectively maintain the nanguo pear taste. The experiment results show that the preservation effect of nano-TiO 2 /chitosan coated antibacterial paper for fruits and vegetables is obvious, can be used for modified preservation packaging of nanguo pears and other fruits.
The quality of perovskite layers has a great impact on the performance of perovskite solar cells (PSCs). However, defects and related trap sites are generated inevitably in the solutionprocessed polycrystalline perovskite films. It is meaningful to reduce and passivate the defect states by incorporating additive into the perovskite layer to improve perovskite crystallization. Here an environmental friendly 2D nanomaterial protonated graphitic carbon nitride (p-g-C3N4) was successfully synthesized and doped into perovskite layer of carbon-based PSCs. The addition of p-g-C3N4 into perovskite precursor solution not only adjusts nucleation and growth rate of methylammonium lead tri-iodide (MAPbI3) crystal for obtaining flat perovskite surface with larger grain size, but also reduces intrinsic defects of perovskite layer. It is found that the p-g-C3N4 locates at the perovskite core, and the active groups -NH2/NH3 and NH have a hydrogen bond strengthening, which effectively passivates electron traps and enhances the crystal quality of perovskite. As a result, a higher power conversion efficiency of 6.61% is achieved, compared with that doped with g-C3N4 (5.93%) and undoped one (4.48%). This work demonstrates a simple method to modify the perovskite film by doping new modified additives and develops a low-cost preparation for carbon-based PSCs.
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