Determination of polymorphic changes in cellulose from Eucalyptus spp. fibres after alkalization

Carrillo-Varela, Isabel; Pereira, Miguel; Mendonça, Regis Teixeira

doi:10.1007/s10570-018-2060-4

Cited by 54 publications

(23 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Referring to past and recent literature data of French et Santiago Cintron 2013 18 , Nam et al 2016 20 , Ling et al 2019 22 and French 2014 28 , all our X-ray pattern samples showed similar characteristic peaks at 2 of 14.5 , 16.5 , 21.6 , 22.9 and 34.5 corresponding to the (101), (110) and (020), (200) and (004) crystallographic planes, respectively 20,21,28 . The shoulder at 2 =20.6 that ascribes the (102) lattice plane reflection can also be observed.…”

Section: X-raysupporting

confidence: 81%

“…The shoulder at 2 =20.6 that ascribes the (102) lattice plane reflection can also be observed. According to the literature data, these diffractions correspond to the typical profile of the cellulose I allomorph 7,21,28,29 . The trough peaks at 2 =18 between the 110 and the 200 crystallographic planes were assumed to account for the amorphous portion of cellulose 20 .…”

Section: X-raysupporting

confidence: 57%

“…The crystallinity index Cr.I. % (sometimes called Segal index) 17 of hardwood samples was calculated from diffraction intensity data using the following empirical equation 1 18,19,20,21,22 : Where I 200 is the total intensity of diffraction of the (200) lattice peak at a 2 ~22.6 for cellulose I (I) and of the (020) lattice peak for cellulose II at a 2 ~21.6 , and I am is the intensity of diffraction of amorphous cellulose content at a 2 ~18 for cellulose I (I) and at a 2 ~16 for cellulose II (minimum intensity in this region) 18 .…”

Section: Crystallinity Index Crimentioning

confidence: 99%

“…The crystalline size D (hkl) was calculated by the Scherrer equation 2 23 perpendicularly to different lattice planes D (hkl) from the 101, 1 ̅ 0, 002 and 004 18,20,21,22,24 .…”

Section: Crystalline Size D (Hkl)mentioning

confidence: 99%

“…1. This range is more reliable to cover all of the significant intensities from both crystalline and amorphous fraction of cellulose, while the peak located in the 2 area ranging from 34.5 to 35.2  was reserved to a mixture of the crystalline fraction (cellulose I, II, I) 20,21,25 . Concerning the aged samples, a significant decrease in the intensities (2 ranging from 10 to 18 and 34.5 ) was observed from A r to A 5 , more pronounced in the case of (A 4 ).…”

Section: X-raymentioning

confidence: 99%

See 4 more Smart Citations

The effect of the natural degradation process on the cellulose structure of Moroccan hardwood fiber: a survey on spectroscopy and structural properties

Boukir¹,

Mehyaoui²,

Fellak³

et al. 2019

Mediterr.J.Chem.,

View full text Add to dashboard Cite

The aim of this work is to study the effect of natural degradation on the cellulose structure conformation changes of 2 ageing Moroccan hardwoods (400 and 500 years) compared to recent one considered as a reference; and to provide information on the polymorphs content variability from two-phases material (crystalline and amorphous) influenced by a long time of ageing and environmental degradation effects. In order to investigate the effects of both natural degradation conditions and a long time of exposure on cellulose structure conformation (examined samples) with estimating their content (crystalline and amorphous cellulose), three combined techniques XRD, ATR-FTIR and FT-Raman spectroscopy were used. XRD results associated with the crystallographic planes and Miller indices provide information on the presence of a mixture of cellulose polymorphs (crystalline cellulose I, II, I  and amorphous phase). The decrease in crystallinity-index values from recent to aged ones (38 to 19.5%) confirms well the occurred alteration of crystalline cellulose fibres and their evolution towards a high content of the amorphous form. The prominent regression in the intensities of three FTIR fingerprint cellulose regions evolving towards an overall increase in the intensities of C=O area (1733-1630 cm-1) is a sign on the introduced changes on cellulose conformation and cellulose fibres degradation more accentuated in the case of the very aged sample (500 years). Similar results were confirmed by combining FT-Raman spectroscopy as a vibrational technique. No work has been done on this genus of degraded Moroccan hardwood and the relevance of this study is to investigate the compositional content and structural conformation, to determine the variability in the forms of both crystalline and amorphous cellulose phases with estimating the evolution of their polymorphism, and to monitor the degree of crystalline cellulose fibres deterioration.

show abstract

Section: X-raysupporting

confidence: 81%

Section: X-raysupporting

confidence: 57%

Section: Crystallinity Index Crimentioning

confidence: 99%

“…The crystalline size D (hkl) was calculated by the Scherrer equation 2 23 perpendicularly to different lattice planes D (hkl) from the 101, 1 ̅ 0, 002 and 004 18,20,21,22,24 .…”

Section: Crystalline Size D (Hkl)mentioning

confidence: 99%

Section: X-raymentioning

confidence: 99%

See 3 more Smart Citations

The effect of the natural degradation process on the cellulose structure of Moroccan hardwood fiber: a survey on spectroscopy and structural properties

Boukir¹,

Mehyaoui²,

Fellak³

et al. 2019

Mediterr.J.Chem.,

View full text Add to dashboard Cite

show abstract

Defibrillated Lignocellulose Recovery Guided by Plant Chemistry and Anatomy – A Pioneering Study with Lupinus angustifolius

Schmidt,

Choong,

Richter‐Dahlfors

et al. 2024

Advanced Sustainable Systems

View full text Add to dashboard Cite

The strive toward sustainability increases the demand for bio‐based material production, forcing expansion of the biorefinery feedstock supply from forest wood to non‐woody materials such as agricultural residues. As a model organism for legume crops, the aptness of agricultural lupins as a lignocellulose feedstock is investigated. Principle chemical analysis combined with optotracing, in which the fluorescent tracer molecule Carbotrace 680 generates a visual map of the native tissues’ lignocellulose anatomy at sub‐cellular resolution, enables informed design of a mild recovery process. A streamlined conversion approach is then designed, yielding lignin‐containing microfibrillated cellulose. By monitoring defibrillation and delignification throughout the extraction process, the use of optotracing for non‐destructive fiber analytics at unprecedented details across all hierarchical structures of lignocellulosic materials is demonstrated. This crop valorization is a prime illustration of a holistic use of lupin biomass, with seeds serving as plant‐based food sources, and other parts as sources for lignocellulose‐based materials, thereby expanding both the biorefinery concept and feedstock supply.

show abstract

Modifications of Alfa fibers by alkali and hydrothermal treatment

et al. 2018

View full text Add to dashboard Cite

Determination of polymorphic changes in cellulose from Eucalyptus spp. fibres after alkalization

Cited by 54 publications

References 62 publications

The effect of the natural degradation process on the cellulose structure of Moroccan hardwood fiber: a survey on spectroscopy and structural properties

The effect of the natural degradation process on the cellulose structure of Moroccan hardwood fiber: a survey on spectroscopy and structural properties

Defibrillated Lignocellulose Recovery Guided by Plant Chemistry and Anatomy – A Pioneering Study with Lupinus angustifolius

Modifications of Alfa fibers by alkali and hydrothermal treatment

Contact Info

Product

Resources

About