Comparative study of cellulosic components isolated from different Eucalyptus species

Carrillo, Isabel; Mendonça, Regis Teixeira; Ago, Mariko; Rojas, Orlando J.

doi:10.1007/s10570-018-1653-2

Cited by 91 publications

(52 citation statements)

References 83 publications

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“…The data show a main peak at 2θ = 22.7 • , which is consistent with crystalline the 002 plane. Two smaller peaks can be observed at 2θ = 15.0 • and 2θ = 16.6 • corresponding to the 101 and planes, respectively [29]. These results correspond to the characteristic peaks of cellulose type I, which allow to conclude that the cellulose structure remains stable after the acidic hydrolysis process [30].…”

Section: Characterizationmentioning

confidence: 56%

Photonic composite materials from cellulose nanorods and clay nanolayers

Trindade

Carreto

Helgesen

et al. 2020

Eur. Phys. J. Spec. Top.

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Cellulose nano crystals (CNCs) are promising materials for energy efficient buildings related to the control of reflectivity and heat absorption/reflection of light. In this sense it is important to improve CNCs films fire retardant properties, which can be achieved by adding clays. Cellulose nanocrystals (CNCs) and nanolayers obtained from Sodium Fluorohectorite (NaFh) synthetic clay are both known to form liquid crystalline phases in aqueous suspensions. CNCs form cholesteric phases, which structure is preserved after water evaporation, while dry NaFh nanolayers aligned films collapse. In this initial work, it is shown that CNCs are compatible with NaFh clay. We demonstrate that the liquid crystalline phase of CNCs in water is not destroyed by the presence of NaFh nanolayers. The NaFh nanolayers act as planar anchoring surfaces to the cellulose nanorods and, after evaporation of the water coloured films are obtained. The precursor solutions and the photonic films were investigated by Describe several techniques.

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Section: Characterizationmentioning

confidence: 56%

Photonic composite materials from cellulose nanorods and clay nanolayers

Trindade

Carreto

Helgesen

et al. 2020

Eur. Phys. J. Spec. Top.

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“…The stretching frequency at 2900 cm −1 was due to the symmetric C-H vibrations. The bond observed in the range of 1420-1430 cm −1 was attributed to the symmetric bending of CH 2 and was also related to cellulose type I [41,42], the band at 1330-1380 cm −1 corresponded to the bending vibrations of the C-H and C-O groups of the polysaccharides [21,43], and the band at 1160 cm −1 is due to C-O-C asymmetric vibrations associated with cellulose I and cellulose II [29,43]. The band at 900 cm −1 indicates the typical structure of cellulose with β-glycoside bonds of glucose ring within the cellulose structure [23,44,45].…”

Section: Ftir Analysismentioning

confidence: 89%

“…Unlike the previously-mentioned study, a positive correlation was found in our data; this result can be attributed to various causes and the cellulose´s source might probably be the most important one. An investigation reported by Carrillo et al [42] mentioned that celluloses obtained from different species of eucalyptus wood shows different crystalline structures and therefore influence their subsequent processing.…”

Section: Relationship Between Cncs Featuresmentioning

confidence: 99%

Relationship between Structural Characteristics of Cellulose Nanocrystals Obtained from Kraft Pulp

et al. 2020

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Kraft pulp cellulose was hydrolyzed using sulfuric acid, under different thermophysical conditions of temperature, time, pulp concentration, and sonication time. The experimental design revealed the effect of these conditions and their interaction on the hydrolysis yield obtained. In addition, the top five cellulose nanocrystals (CNCs) yields from this experiment design were analyzed. The results obtained indicated that CNCs possess a morphology that can be described as individualized rod particles, with average diameters less than 50 nm and different size distribution. In the analysis of CNCs features, significant Pearson correlations were established between the crystallinity of the CNC, CNC yield, and interplanar crystallites distance (Δd/d). The thermogravimetric (DTG) profiles exhibited two CNCs degradation stages, where the second stage CNCs degradation showed a significative correlation with CNC sulfur content. In our analysis, the crystallographic parameters exhibited a correlation with the mechanical behavior of the CNC, since the potential variation between the distances of the crystalline planes is related to the stress and deformation present in the crystallites of CNCs. This study provides new knowledge regarding CNCs, further enhancing information for CNC-based industries and the processability of CNCs for the development of new materials.

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“…All peaks present in the coatings over aluminum substrates could not be observed due to overlapping with jarina seed peaks. The seed presents a similar spectrum to cellulose, [48,49] with peaks associated with OH (3,700-3,000, 1,641 cm −1 ), CH 2 (2,912, 2,875 cm −1 ), CH 3 (2,930, 2,894 cm −1 ), C-O-C (1,178 cm −1 ), and C-O (1,062 cm −1 ) bonds. However, peaks corresponding to crystalline mannan (3,492,3,297, and 3,359 cm −1 ), Dmannopyranose units (870 cm −1 ), and α-mannose (800 cm −1 ) confirm that the seed is constituted by mannan polysaccharide.…”

Section: Chemical Compositionmentioning

confidence: 99%

Antibacterial coatings on vegetable ivory obtained by cold plasma jet activation of silicone and copaiba oils

Silva

Queiroz

Kling

et al. 2020

Plasma Processes & Polymers

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Vegetable ivory obtained from the endosperm of jarina seeds (Phytelephas macrocarpa), native to the Amazon region, has been regarded as a sustainable alternative to elephant ivory; however, it is vulnerable to biodegradation due to its mannan polysaccharide composition. In this study, vegetable ivory was coated by atmospheric air plasma jet activation of silicone and copaiba oils. Stable, smooth, and crosslinked micrometric coatings were formed after 80 s of plasma activation. Water contact angle results show that hydrophobicity was enhanced without detrimental effects on the surface reflectance. The best antibacterial performance against Staphylococcus aureus and Escherichia coli was obtained for a 1:1 mixture of both oils due to the synergetic action of silicone hydrophobicity and copaiba bioactivity.

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Comparative study of cellulosic components isolated from different Eucalyptus species

Cited by 91 publications

References 83 publications

Photonic composite materials from cellulose nanorods and clay nanolayers

Photonic composite materials from cellulose nanorods and clay nanolayers

Relationship between Structural Characteristics of Cellulose Nanocrystals Obtained from Kraft Pulp

Antibacterial coatings on vegetable ivory obtained by cold plasma jet activation of silicone and copaiba oils

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