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            文件名稱: Luminescent?and?Transparent?Nanopaper?Based?on?Rare-Earth?Up-Converting?Nanoparticle?Grafted?Nanofib
            公司名稱: PhD Technology LLC
            下載次數: 1390
             ABSTRACT: Highly flexible, transparent, and luminescent
          nanofibrillated cellulose (NFC) nanopaper with heterogeneous
          network, functionalized by rare-earth up-converting
          luminescent nanoparticles (UCNPs), was rapidly synthesized
          by using a moderate pressure extrusion paper?making process.
          NFC was successfully prepared from garlic skin using an
          efficient extraction approach combined with high frequency
          ultrasonication and high pressure homogenization after
          removing the noncellulosic components. An efficient epoxidation treatment was carried out to enhance the activity of the
          UCNPs (NaYF4:Yb,Er) with oleic acid ligand capped on the surface. The UCNPs after epoxidation then reacted with NFC in
          aqueous medium to form UCNP-grafted NFC nanocomposite (NFC?UCNP) suspensions at ambient temperature. Through
          the paper-making process, the assembled fluorescent NFC?UCNP hybrid nanopaper exhibits excellent properties, including high
          transparency, strong up?conversion luminescence, and good flexibility. The obtained hybrid nanopaper was characterized by
          transmission electron microscopy (TEM), atomic force microscope (AFM), Fourier transform infrared spectroscopy (FTIR),
          field emission-scanning electron microscope (FE-SEM), up?conversion luminescence (UCL) spectrum, and ultraviolet and
          visible (UV?vis) spectrophotometer. The experimental results demonstrate that the UCNPs have been successfully grafted to
          the NFC matrix with heterogeneous network. And the superiorly optical transparent and luminescent properties of the
          nanopaper mainly depend on the ratio of UCNPs to NFC. Of importance here is that, NFC and UCNPs afford the nanopaper a
          prospective candidate for multimodal anti-counterfeiting, sensors, and ion probes applications.
          KEYWORDS: nanofibrillated cellulose, luminescent nanopaper, garlic skin, rare-earth up-converting nanoparticles, extrusion