Stretchable, flexible, and transparent SrAl2O4:Eu2+@TPU ultraviolet stimulated anti-counterfeiting film

Amorphous Alumina: A Bright Red Matrix for Flexible and Transparent Anti-counterfeiting

“…As the annealing temperature increases, amorphous alumina gradually transforms into γ-Al 2 O 3 and α-Al 2 O 3 . Since ionic radii have a large variation between Eu 3+ and Al 3+ , Eu 3+ cannot enter the lattice structure, resulting in a decrease in luminous intensity, which is the same as the previous study …”

Lattice-site engineering in ZnGa2O4:Cr3+ through Li+ doping for dynamic luminescence and advanced optical anti-counterfeiting

“…Therefore, particle complexes are usually combined with inorganic or organic materials to overcome the problem of poor stability of materials. 8 In recent years, films have been used in products because of their excellent properties of being colorless and transparent under ordinary natural light, but showing predetermined anti-counterfeiting patterns with UV light. 9,10 In addition, transparent optical ink in the anti-counterfeiting aspect also has potential application value, but most of the manufacturing processes are time-consuming, and the use of toxic organic solvents, such as dimethylformamide (DMF), dimethyl sulfoxide (DMSO), toluene, and acetone, make the non-toxic transparent ink research need to be further developed.…”

Graphene oxide/thermoplastic polyurethane wrinkled foams with enhanced compression performance fabricated by dynamic supercritical CO2 foaming

“…Thermoplastic polyurethane (TPU) is an essential industrial elastomer with excellent elasticity, aging resistance, abrasion resistance, biocompatibility, and lowtemperature flexibility. 1,2 Supercritical carbon dioxide (scCO 2 ) is a promising foaming agent with high solubility and diffusivity in polymers, as well as non-toxic and environmentally friendly characteristics. 3 Producing TPU foams using scCO 2 foaming is a cost-effective green approach that has been widely used in the production of sports shoe soles, cushion gaskets, packaging and transportation, automotive interiors, and medical products.…”