Facile in situ synthesis of nickel/cellulose nanocomposites: mechanisms, properties and perspectives

Use of CeO2 Nanoparticles to Enhance UV-Shielding of Transparent Regenerated Cellulose Films

“…Moreover, the calculated results revealed that with porous RC film as support, the precursor concentration had little influence on the crystalline size of in-situ synthesized CeO 2 NPs except at high Ce 3+ concentrations. At low Ce 3+ ions concentrations, due to the electron-rich oxygen atoms of polar hydroxyl and ether groups of the cellulose macromolecule, predictable interaction between the porous RC film and electropositive Ce 3+ ions would prevent the growth of larger crystals [30]. However, when the concentration of Ce 3+ ions was so high that the porous cellulose had difficulty to exert effective electrostatic action on excessive metal ions, its control effect on the crystal size was weakened.…”

“…In addition, the peak at 528 cm −1 , corresponding to Ce–O stretching [20], could be observed in the spectra of the CeO 2 , and nanocomposite films, indicating the successful in-situ synthesis of CeO 2 . Furthermore the stretching vibration bands of the hydroxyl groups of cellulose at 3300–3650 cm −1 was shifted to a higher wavenumber with increasing Ce 3+ concentration form 0 to 0.3 mol/L, suggesting a reduction in hydrogen bonding between cellulose molecules and an increased interaction between the hydroxyl group of cellulose and CeO 2 NPs [30]. However, as the Ce 3+ concentration reached 0.5 mol/L, the OH peak shifted to a lower wavenumber, indicating a reduction of the interaction between CeO 2 NPs and RC, due to aggregation of CeO 2 NPs, as shown in SEM (Figure 4).…”

Selective synthesis of Fe3O4, γ-Fe2O3, and α-Fe2O3 using cellulose-based composites as precursors

“…Cellulose composites have been receiving more and more attention due to their wide applications in biomedical, electrically conductive, catalysis, optical, separating, antimicrobial, and thermo-responsive elds. 1,2 Until now, rapid progress has been made in the preparation of cellulose composites including cellulose/Ni, 3 cellulose/l-Fe 2 O 3 , 4 cellulose/Fe 3 O 4 /Ag, 5 cellulose/ reduced graphene oxide, 6 cellulose/Ag 3 PO 4 , 7 cellulose/CaCO 3 , 8 etc. It was reported that various methods such as the biomimetic method, 9 sol-gel, 10 (co-)precipitation method, 11 hydrothermal method, 12 freeze-drying method, 13 microwave-assisted method, 14 and ultrasound method 15 were employed for the synthesis of cellulose composites.…”

Facile approach of Ni/C composites from Ni/cellulose composites as broadband microwave absorbing materials

“…9 We previously fabricated Ni/ cellulose composites with tunable magnetic and electrical properties by a facile in situ synthetic route. 10 We found that although the Ni nanoparticles were uniformly dispersed in and immobilized by the cellulose matrix, the prepared Ni/cellulose composites did not exhibit a strong response in the microwave region due to the cellulose not being an absorber of microwave radiation. In the current work, Ni/C composites were prepared by carrying out a direct carbonation reaction using the nickel/cellulose composites as reactants.…”

“…First, Ni/cellulose composites were fabricated by following a facile in situ synthetic route based on our previous work. 10 Then, the obtained Ni/cellulose composites were subjected to carbonization by being heated at 800 C for 4 h in a owing H 2 /Ar (5 : 95) mixture gas to produce Ni/C composites.…”