Processing and functional assessment of anisotropic cellulose nanofibril/Alolt/sodium silicate: based aerogels as flame retardant thermal insulators

Gorgieva, Selestina; Jančič, Urška; Hribernik, Silvo; Fakin, Darinka; Kleinschek, Karin Stana; Medved, Sergej; Fakin, Tomaž; Božič, Mojca

doi:10.1007/s10570-019-02901-3

Cited by 21 publications

(14 citation statements)

References 58 publications

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“…The in ection point of both nanocomposite lms occurred at around 330°C, given a weight loss of around 60% in the case of MFC-ATH40w, and around 40% for MFC-ATH20p lms, while, for the pure MFC sample, this temperature was at around 350°C with 59% of weight loss. The addition of ATH nanoparticles also had a noticeable effect on the amount of residue after thermal decomposition, which increased from ∼1.8% for pure MFC lm to around 10% already with 30 w/w% addition of ATH40w and ATH20p, and further, to even ∼20-23% for lms containing the highest (50 w/w%) ATH concentrations, which is comparable with the other cellulose based materials containing different ATH nanoparticles (Gorgieva et al 2020;Zhang et al 2017;Yang et al 2017). The higher residue amount means that the ATH nanoparticles had suppressed the lm' degradation successfully with the dilution of radicals in ame, while the residue of alumina formed the protective layer (Hull et al 2011).…”

Section: Mechanical Properties Of the Lmssupporting

confidence: 53%

“…The FTIR spectrum of pure MFC lm shows typical cellulose bands: A broad band at ∼3323 cm − 1 for hydrogen bonded OH stretching, at ∼2892 cm − 1 for CH stretching, at ∼1640 cm − 1 for OH bending of absorbed water, at ∼1420 cm − 1 for CH 2 bending, at ∼1026 cm − 1 for C-O bending, and at ∼897 cm − 1 for CH or CH 2 stretching (Lu et al 2008;Gorgieva et al 2020). The presence of ATH40w in the MFC intensi ed its peak related to the OH groups over the range of 3616 − 3349 cm − 1 , also showing three shoulders typical for Al-OH interactions on its backbone, as well as a characteristic peak for Al-O stretching of ATH40w at ∼1018 cm − 1 (Gorgieva et al 2020). This may indicate the hydrogen bonding between the -OH groups of ATH particles and the cellulose backbone of MFC, covering the brils` surfaces.…”

Section: Surface Morphological and Physico-chemical Properties Of Thementioning

confidence: 99%

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Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Kolar

Mušič²,

Korošec

et al. 2021

Preprint

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Differently structured aluminum (tri/mono) hydroxide (Al(OH)3 / AlO(OH)) nanoparticles were prepared and used as thermal-management additives to microfibrillated cellulose (MFC), cast-dried in thin-layer films. Both particles increased the thermal stability of the MFC film, yielding 20–23% residue at 600 °C, and up to 57% lowered enthalpy (to 5.5–7.5 kJ/g) at 0.15 wt% of loading, while transforming to Al2O3. However, the film containing 40 nm large Al(OH)3 particles decomposed in a one-step process, and released up to 20 % more energy between 300–400°C as compared to the films prepared from smaller (21 nm) and meta-stable AlO(OH), which decomposed gradually with an exothermic peak shifted to 480 °C. The latter resulted in a highly flexible, optically transparent (95%), and mechanically stronger (5.7 GPa) film with a much lower specific heat capacity (0.31 − 0.28 J/gK compared to 0.68–0.89 J/gK for MFC-Al(OH)3 and 0.87–1.26 for MFC films), which render it as an effective heat-dissipating material to be used in flexible opto-electronics. Low oxygen permeability (2192.8 cm3/m2day) and a hydrophobic surface (>60°) rendered such a film also useful in ecologically-benign and thermosensitive packaging.

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Section: Mechanical Properties Of the Lmssupporting

confidence: 53%

Section: Surface Morphological and Physico-chemical Properties Of Thementioning

confidence: 99%

Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Kolar

Mušič²,

Korošec

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…5 a, the first stage (in the region 25–140 °C) showed the loss of moisture in the samples, which indicated that they had good water retention (Teng et al 2018 ). Decomposition of the sample took place mainly in the second stage (within the range of 220–400 °C), due to depolymerization of the cellulose, caused by breaking of β (1 → 4) glycosidic ether bonds, forming levoglucosan (1,6-anhydro-β-d-glucopyranose) and carbon residues (Gorgieva et al 2020 ). In the third stage, the residues of the sample slowly decreased with increasing temperature because the remaining residues were further oxidized.…”

Section: Resultsmentioning

confidence: 99%

Facile preparation and performance study of antibacterial regenerated cellulose carbamate fiber based on N-halamine

Zhu

et al. 2021

Cellulose

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With the outbreak of coronavirus disease (COVID-19) which has incalculable disasters and economic losses, people have given increasing attention to the health and safety of textile and fiber materials. In this study, an eco-friendly, facile, and cost-effective wet-spinning cellulose carbamate fiber technology was developed, and N-halamine regenerated cellulose fiber (RCC-Cl) with rechargeable and rapid bactericidal properties were prepared by the Lewis acid-assisted chlorination method. The chemical properties of the fibers were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetric analysis, and energy-dispersive X-ray spectroscopy. The mechanical and surface topography of the treated fiber was investigated by tensile testing and scanning electron microscopy. The results showed that the mechanical properties of RCC-Cl fibers can reach a breaking strength of 12.1 cN/tex and a breaking elongation of 41.4% with the optimized spinning process. Furthermore, RCC-Cl showed excellent antimicrobial activities, which can inactivate Escherichia coli and Staphylococcus aureus at a concentration of 10 7 CFU/mL within 1 min. This work provided a novel approach to produce regenerated cellulose fibers with antibacterial properties, showing great potential in the field of functional textiles.

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“…To have a look at the behaviour of the films when they are exposed to open flame, the photographs were taken according to the procedure adapted from (Gorgieva et al 2020). As can be seen from photographs in Fig.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

High oxygen barrier chitosan films neutralized by alkaline nanoparticles

Jančič

Božič²,

Hribernik

et al. 2021

Cellulose

Self Cite

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The most frequent neutralisation procedure, applied on chitosan (CS) films includes treatment with NaOH base. Such treatment endows CS films with stability in water, yet, same can significantly decrease the film performance. In the present paper, we investigate Mg(OH)2 nanoparticles as a neutralisation agent for CS solutions followed by casting into films. This is combined and compared with classical casting and film drying from non-neutralized solutions followed by NaOH treatment after film formation. The influence on the properties of resulting films is investigated in detail and large differences are found for structure and barrier properties. The stable, opaque-to-transparent CS films (depending on Mg(OH)2 content and post-treatment) were obtained by facile casting method of neat CS or CS–Mg(OH)2 dispersions, in the complete absence of cross-linkers and plasticizers. FTIR data demonstrate the Mg(OH)2 and NaOH deprotonation effect, and strongly suggest intensive H-bonding interaction between CS and Mg(OH)2. X-ray photoelectron spectroscopy showed differences in the hydroxide content and protonation of CS nitrogen. The reduction of surface roughness and increase of homogeneity, the tensile strength and elongation, as well as thermal stability and excellent oxygen barrier properties were measured for CS enclosing the Mg(OH)2 nanoparticles. Further treatment with 1 M NaOH causes re-packing of CS polymer chains, improving the crystallinity and water vapour barrier properties, degrading the mechanical properties by increasing the films brittleness and increasing the char formation due to reduced thermal stability. Graphic abstract

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Processing and functional assessment of anisotropic cellulose nanofibril/Alolt/sodium silicate: based aerogels as flame retardant thermal insulators

Cited by 21 publications

References 58 publications

Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Addition of Al(OH)3 vs. AlO(OH) nanoparticles on the optical, thermo-mechanical and heat/oxygen transmission properties of microfibrillated cellulose films

Facile preparation and performance study of antibacterial regenerated cellulose carbamate fiber based on N-halamine

High oxygen barrier chitosan films neutralized by alkaline nanoparticles

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