New electromagnetic shielding materials based on viscose‐carbon nanotubes composites

Culica, Madalina Elena; Biliuță, Gabriela; Rotaru, Razvan; Lisă, Gabriela; Baron, Raluca Ioana; Coseri, Sergiu

doi:10.1002/pen.25149

Cited by 12 publications

(7 citation statements)

References 37 publications

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“…In a very recent review, cellulose is considered “a ubiquitous platform for ecofriendly metal nanoparticles preparation” [ 16 ] due to its versatility and efficiency to incorporate a wide range of metallic and metal oxide nanoparticles. Often, to impart a broader area of applicative domains, cellulose derivatives, including those carrying carboxyl groups as for example TEMPO-oxidized cellulosic materials in form of powder, fibers and films are prepared [ 17 , 18 , 19 , 20 ]. In this way, the newly introduced functionalities improve specific properties such as solubility in organic solvents and processability, also creating dedicated sites for anchoring various (bio)organic carriers.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…As shown in Figure 4D, the tensile strength of bioplastic (62.36 MPa) was higher than nanocellulose-based bioplastics. 46,47 It can be attributed to reduced intrinsic defect size and the reformed strong hydrogen bonding between the cellulose paper and OC. The average diameter of OC is 37.273 μm, which is smaller than that of cellulose-lignin mixture (CLM; 52.616 μm).…”

Section: Mechanical and Water Stability Of Hydrophobic Bioplasticmentioning

confidence: 99%

Oxidized cellulose as bio‐adhesive for hydrophobic lignocellulosic bioplastic

Xu,

Wang,

Alam

et al. 2024

Polymer Composites

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This study presents a novel hydrophobic lignocellulosic bioplastic from corn stover reinforced by oxidized cellulose and in situ regenerated lignin. Cellulose‐lignin mixture as a matrix was obtained by acid‐recyclable deep eutectic solvent (DES) pretreatment of corn stover in mild conditions. Triethoxy(octyl)silane (C14H32O3Si) was employed to improve the water stability of the bioplastic by vapor deposition. The results show that the hydrophobic bioplastic has a high tensile strength, measuring 62.36 MPa. The water contact angle of the bioplastic was increased from 8.50° to 121.9° after hydrophobic modification. We prepared oxidized cellulose‐reinforced cellulose paper by different particle size distributions of oxidized cellulose to investigate the reinforcement of oxidized cellulose. The tensile strength of oxidized cellulose cellulose paper increased from 14.41 to 21.18 MPa with the addition of oxidized cellulose. The zeta potential of oxidized cellulose is −47.99 mV, which shows a more negative charge due to carbonyl groups. The repulsive force of oxidized cellulose contributes to the formation of a brick‐and‐mortar microstructure with cellulose‐lignin mixture. It demonstrates that oxidized cellulose can act as bio‐adhesives and has a good toughening effect on the mechanical properties of bioplastic.Highlights Lignocellulosic bioplastic was prepared by DES pretreatment of corn stover. Oxidized cellulose was used to reinforce the lignocellulosic bioplastic. The tensile strength of the bioplastic was 62.36 MPa after the reinforcement process. Trieth‐oxy(octyl)silane was employed to improve water stability. The water contact angle of the bioplastic was increased from 8.50° to 121.9°.

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“…A recent study performed by Culica et al [ 56 ] shows that viscose fibers in their natural form or oxidized at C6 to introduce carboxyl groups are able to embed carbon nanotubes using ultrasonication process, see Figure 11 . The resulting composites possess electromagnetic shielding properties, especially in the industrial frequency range (50–55 Hz).…”

Section: Applications Of the Cellulose-based Materialsmentioning

confidence: 99%

Insights on Cellulose Research in the Last Two Decades in Romania

Coseri

2021

Polymers

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In the current global context, cellulose fulfills those characteristics that give it clear advantages over synthetic fibers, having a huge potential for substituting fossil-based materials which are polluting and harmful to ecosystems. Research conducted in most laboratories around the world in the field of cellulose is overwhelmingly aimed at industrial needs because features such as renewability and low cost are the most important attributes for economic success. In this global effort, Romanian researchers contribute through achievements that are briefly reviewed in this paper. These refer to the main achievements reported after 2000 in the field of cellulose characterization and cellulose functionalization, as well as the main areas where cellulose-based materials were applied.

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New electromagnetic shielding materials based on viscose‐carbon nanotubes composites

Cited by 12 publications

References 37 publications

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

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

Oxidized cellulose as bio‐adhesive for hydrophobic lignocellulosic bioplastic

Insights on Cellulose Research in the Last Two Decades in Romania

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