Cellulose Acetate Incorporating Organically Functionalized CeO2 NPs: Efficient Materials for UV Filtering Applications

Abstract

<jats:p>One of the major issues faced when constructing various materials incorporating inorganic nanoparticles (NPs) is aggregation leading to loss of their final activity. In our work, cellulose acetate (CA) has been used to serve as matrix for the synthesis of UV-shielding and transparent films containing various amounts (1–5 wt.%) of cerium oxide (CeO2) NPs. In order to attain an improved dispersion and a better connectivity between NPs and the cellulose matrix, the surface of CeO2 NPs have been previously functionalized by the reaction with 3-aminopropyl(diethoxy)methylsilane (APDMS). The uniform dispersion of the NPs in the homogeneous thin films has been evidenced by using Transmission Electron Microscopy (TEM) and Fourier Transformation Infrared Spectroscopy (FTIR) characterization. The investigation of the optical properties for the hybrid films through UV-Vis spectroscopy revealed that the presence of CeO2 NPs in the CA matrix determined the appearance of strong UV absorption bands in the region 312–317 nm, which supports their use as efficient UV absorbers. This study has shown that UV shielding ability of the nanocomposites can be easily tuned by adjusting the numberof inorganic NPs in the CA template.</jats:p>

CeO2-Blended Cellulose Triacetate Mixed-Matrix Membranes for Selective CO2 Separation

“…The bulk/aggregated particles might have instantaneously broken and segregated into their smallest forms due to rigorous ultrasonication force, hence facilitating the dispersion of filler particles. This good distribution due to the high compatibility between the polymer and CeO 2 nanoparticles was expected because of the favorable interaction between the acetate group (anionic) in the CTA polymer, which is capable of forming highly oriented hydrogen bonding and CeO 2 via direct coordination to the central Ce metal ion or through the peripheral oxygen, forming a CTA-O-Ce hybrid [ 36 , 37 ]. Moreover, some aggregation of CeO 2 nanoparticles after embedding can be observed for CTA with 0.9 wt.% loading.…”

“…On the other hand, CTA without entrapped solvents has been reported to show no substantial weight loss before 190 °C [ 42 ]. The decrease in weight loss with the addition of CeO 2 nanoparticles is attributed to the stabilization of the organic matrix because of the interaction with the CeO 2 component [ 37 ]. The initiation of the more pronounced degradation process is observed at around 300 °C.…”

Preparation and Biocompatibility of Poly Methyl Methacrylate (PMMA)-Mesoporous Bioactive Glass (MBG) Composite Scaffolds

“…All of the prepared scaffolds ( Figure 1 ) show the absorption bands at 2992, 2952 cm −1 assigned to C–H stretching vibrations related to the polymer matrix. The presence of hydrocarbon is indicated by the band at 1434 cm −1 due to the CH asymmetric bending vibration of CH 2 [ 20 ]. Furthermore, the band at 1734 cm −1 correspond to the stretching vibration of the carbonyl (C=O) group while the band at 1638 cm −1 is due to C=C stretching vibration.…”

CO2 Capture by Reduced Graphene Oxide Monoliths with Incorporated CeO2 Grafted with Functionalized Polymer Brushes

“…At the The FTIR results clearly demonstrate the successful synthesis of the polymer brushes. First, in the area of 3800-2800 cm −1 (Figure 4a), the stretching vibration of the OH groups can be seen (3400-3300 cm −1 ) (Figure 4a) [25][26][27]. In addition, the peak centered at 2985 cm −1 (Figure 4a) was assigned to C-N + stretching vibration.…”