Preparation and Properties of Fluorescent Cellulosic Paper via Surface Coating of Anionic Cellulose Ethers/Rare Earth Metal Ions Composites

Abstract

Fluorescent paper made by coating cellulosic paper with fluorescent composites shows great potential in many fields, since this fluorescent paper could have both the intrinsic mechanical properties of the cellulosic paper and the fluorescent properties of the composites. In this research, we prepared fluorescent paper sheets by coating four new fluorescent composites, namely CMC/Eu(III), CMC/Tb(III), HPCMC/Eu(III), and HPCMC/Tb(III), onto a cellulosic paper. The analysis of the rheological behavior of the composites demonstrated that all fluorescent composites exhibited similar shear-shining and thixotropy properties as both the CMC and HPCMC solutions. This suggested that these fluorescent composites could be used as coating materials in the paper-making industry to make functional paper. The impacts of these coated composites on both the fluorescent and mechanical properties of the cellulosic paper were studied. Mechanical properties, including bursting strength, tensile strength, tensile rate, tearing strength, and folding strength, increased about 30% after the paper was coated with the fluorescent composites. In particular, both the tensile strength and the toughness of the fluorescent paper increased significantly. Emission spectra of all fluorescent paper sheets exhibited the characteristic emission of Tb 3+ ( 5 D 4 → 7 F 5 transition, 545 nm) or Eu 3+ ( 5 D 0 → 7 F 2 transition, 612 nm). Moreover, letters written with the composites suspensions on a common printing paper sheet were clearly observed by the naked eye under UV light at 254 nm. This study thus offers a simple and effective route to prepare quality fluorescent papers by coating fluorescent composites onto cellulosic papers, which could further guide the application of these fluorescent composites in the papermaking industry.

Fluorescent Composite Hydrogel of Carboxymethyl Celluose-Eu(Ⅲ)/Polyvinyl Alcohol and Its Application in Functional Paper

“…Preparation of CMC-Eu( ) composites 0.0318 mol/L EuCl 3 solutions were made according to the reference (Ye et al 2019). 1.0 g of CMC powder was dissolved in 100 ml of deionized water at room temperature.…”

Enhancement of Ultraviolet B Irradiation with a Photoluminescent Composite Film and Its Application in Photochemical Microfluidic Synthesis

“…For example, CsPbBr 3 perovskite quantum dots absorb UV light and emit visible radiation . Other photoluminescent materials, such as Ag-doped and rare-earth-doped (e.g., Y 2 O 3 :Eu 3+ ) luminescent particles, have also been successfully used in cell analysis, fluorescence labeling, and other medical applications. , Among these luminescent materials, LaB 3 O 6 :Gd,Bi has the ability to absorb the light with a wavelength of 254 nm and to emit 312 nm radiation. If this material is integrated with mercury lamps, the undesired 254 nm emission can be converted to 312 nm emission, causing an increased emission intensity in the UVB region and a decreased intensity in the undesired region.…”