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Composite up-conversion luminescent films containing a nanocellulose and SrF2:Ho particles
摘要： The synthesis of up-conversion luminescent composite films based on a nanocellulose matrix containing Sr1-xHoxF2+x particles was proposed. The combination of sulfuric acid hydrolysis and ultrasonication allowed us to synthesize a series of stable nanocellulose dispersions from various raw materials (powdered sulphate bleached wood pulp, Blue Ribbon filter paper, and microcrystalline cellulose Avicel). The size distribution of cellulose nanoparticles in the aqueous dispersions was determined. Cellulose nanocrystals (CNC) and/or cellulose nanofibrils (CNF) dispersions were used to fabricate thin films by solution casting followed by solvent evaporation under ambient conditions. The size and shape of cellulose nanoparticles, surface morphology, crystallinity index of nanocellulose, polymerization degree, and optical properties were studied. By mixing aqueous dispersions of CNC with up-conversion Sr1-xHoxF2+x particles, homogeneous suspensions were obtained. Finally, a solution casting technique was used to prepare CNC/Sr1-xHoxF2+x and CNC/CNF/Sr1-xHoxF2+x nanocomposite films. CNC/CNF dispersions were utilized for the production of flexible, durable, transparent composite films. The synthesized nanocomposites demonstrated intense red luminescence upon Ho3+ excitation by 1912 nm laser radiation. The obtained up-conversion luminescent composite films can be considered as a promising material for photonics, in particular for near-IR laser labeling and radiation visualization, luminescent sensorics.
关键词： Nanocomposites,Up-conversion luminescent films,Cellulose nanofibrils,Cellulose nanocrystals,SrF2:Ho3+
更新于2025-09-23 15:23:52
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A 3D net-like structured fluorescent aerogel based on carboxy-methylated cellulose nanofibrils and carbon dots for a highly effective adsorbent and sensitive optical sensor of Cr(VI)
摘要： To effectively detect and remove Cr(VI) from aqueous solution, a 3D net-like structured fluorescent aerogel was designed and synthesized using highly photoluminescent carbon dots (CDs) and renewable natural carboxy-methylated cellulose nanofibrils (CM-CNF). The surface morphology, microstructure, chemical elements and fluorescence properties of this novel aerogel were studied. Sorption experiments were designed to investigate the sorption properties of Cr(VI) onto this fluorescent aerogel. The adsorption process was described by pseudo-second-order kinetic model and Freundlich model, and the maximum adsorption capacity for Cr(VI) reached 433.5 mg g–1. Furthermore, this novel aerogel emitted bright blue fluorescence with a quantum yield of 11.8 % when applied to Cr(VI) sensing, and a good linear relationship between the quantum yield and Cr(VI) concentration was demonstrated. Accordingly, this novel 3D net-like structured fluorescent aerogel should be a promising smart sorbent for the removal of Cr(VI) with advantages of the 3D net-like structure and rich functional groups that accelerate Cr(VI) sorption and the wrapped fluorescent probe that improves Cr(VI) sensing.
关键词： optical sensor,Cr(VI) removal,3D net-like structured fluorescent aerogel,carboxy-methylated cellulose nanofibrils,carbon dots
更新于2025-09-19 17:13:59
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Transparent Cellulose Nanofibrils Composites with Two-layer Delignified Rotary-cutting Poplar Veneers (0?°-layer and 90?°-layer) for Light Acquisition of Solar Cell
摘要： Our transparent cellulose nanofibrils composites (TCNC) directly from rotary-cutting poplar veneer (RPV) whose lignin can be easily stripped by our treatment. This TCNC is prepared by stripping lignin of original RPV and infiltrating epoxy resin (ER) into delignified RPV. This TCNC with two-layer delignified RPVs whose grains perpendicular (0/90°) to each other, which were solidified on solar cell while infiltrating ER. This TCNC with high transmittance (~90%), high haze (~90%), and equal refractive index fluctuation. Comparing with epoxy resin (ER), this TCNC can enhance open circuit voltage (VOC) from 1.16 to ~1.36 and short circuit density (JSC) from 30 to ~34 for the solar cell, and can enhance test fore from 0.155 kN to ~0.185 kN and displacement from 43.6 mm to ~52.5 mm.
关键词： light acquisition,rotary-cutting poplar veneer,delignification,epoxy resin,solar cell,transparent cellulose nanofibrils composites
更新于2025-09-19 17:13:59