Shish kebab‐like structures of cellulose

Buléon, A.; Chanzy, H.; Roche, E. J.

doi:10.1002/pol.1977.130150502

Cited by 24 publications

(18 citation statements)

References 8 publications

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“…Although not validated experimentally, a comparison with the literature indicates that the corresponding diffraction pattern would be a mixture of cellulose II ribbons and cellulose IVII lamellae 32 . In addition, elongated structures similar to the so-called shish-kebab arrangements obtained in the literature when growing crystallizing cellulose II on cellulose I seed could be observed 34 . Increasing the MCC consistency from 1.0 wt.% to 5.0 wt.% (Fig 20.c) resulted in similar particles, albeit with better formed lamellae.…”

Section: The Structure and Morphology Of Precipitatessupporting

confidence: 68%

“…In addition, it contains the first cross-team cooperation with the University of Valladolid and reconciliation of experimental results from that research group during the same period 29 . Furthermore, the results on LMWC precipitation were analyzed in light of the extensive and high-quality corpus of literature from the 1970s and 1980s on cellulose crystallization [31][32][33][34][35][36][37][38] . Finally, significant effort was put in characterizing the LMWC produced by supercritical water treatment and to compare it with microfibrillated nanocellulose produced from MCC by mechanical means 39,40 .…”

Section: Afmmentioning

confidence: 99%

“…In contrast, the literature on LMWC and cello-oligosaccharides (COS), the oligomers of cellulose, is significantly more limited in scale because there is today no simple and cost-efficient method to produce and isolate them 61,62 . However, a number of publications focused on LMWC in the 1970s and 1980s, as part of continued efforts to artificially crystallize cellulose in order to understand its structure [32][33][34][35][36] .…”

Section: Low-molecular-weight Cellulosementioning

confidence: 99%

“…In addition, the materials presented in this section did not undergo initial filtration after production, and thus are composed of both residual and LMWC fractions. The primary objective is to discuss the range of possible nanocellulosic products by correlating the structure and morphology of LMWC with yield, DP, and precipitation conditions, using some of the literature on LMWC crystallization presented in Section 3.2.3 as the basis for discussion [31][32][33][34] . The additional effects caused by the depressurization reactor under high cellulose consistency, such as shear-induced degradation, are the focus of Section 5.3.1.…”

Section: The Structure and Morphology Of Precipitatesmentioning

confidence: 99%

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The chemical-free production of nanocelluloses from microcrystalline cellulose and their use as Pickering emulsion stabilizer

Buffière

Balogh-Michels

Borrega

et al. 2017

Carbohydrate Polymers

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This paper takes a comparative approach in characterizing two types of nano-scale cellulosic particles obtained using chemical-free pathways, either by nearcritical water treatment or by high-shear homogenization from the same microcrystalline cellulose (MCC). The nearcritical water treatment efficiently depolymerized cellulose, producing a solid precipitated fraction of low-molecular-weight material containing cellulose II, while homogenization mechanically deconstructed MCC without altering its molecular structure. Both pathways yielded nanocellulose-like materials yet with different morphologies. The mechanically produced, rod-like particles were obtained with high yield. In contrast, the hydrothermal precipitate exhibited more hydrophobic ribbon-like particles that provided a greater level of particle-particle interaction. Both materials successfully acted as stabilizers for oil-in-water Pickering emulsions; however, the hydrothermally-produced material exhibited superior performance, with stable emulsions obtained upon addition of as low as 1.0wt.% cellulose. These two pathways are highly relevant for altering the structure and properties of MCC and for formulating new, sustainably produced nanocellulose-based materials.

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Section: The Structure and Morphology Of Precipitatessupporting

confidence: 68%

Section: Afmmentioning

confidence: 99%

Section: Low-molecular-weight Cellulosementioning

confidence: 99%

Section: The Structure and Morphology Of Precipitatesmentioning

confidence: 99%

See 2 more Smart Citations

The chemical-free production of nanocelluloses from microcrystalline cellulose and their use as Pickering emulsion stabilizer

Buffière

Balogh-Michels

Borrega

et al. 2017

Carbohydrate Polymers

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“…These cellulose II crystals were hooked perpendicular to the remaining microfibrillar cellulose I core in a "shish-kebab" type morphology (Chanzy and Roche, 1976). This revealed that the cellulose microfibril surface could promote the nucleation of cellulose II, when crystallizing from dilute cellulose solutions (Buléon et al ,1976).…”

Section: Cellulose Allomorphs Seen By Temmentioning

confidence: 97%

Transmission electron microscopy of cellulose. Part 1: historical perspective

2018

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Following the first electron micrographs of cotton in 1940, the development of transmission electron microscopy applied to native cellulose has been evolving in a series of successive advances. At first, faced with the weak contrast of the early images, the operators had to use specific electron dense contrasting agents to reveal the ultrastructure of their samples.It was thus found that all native celluloses consisted of microfibrils, with some size variations depending on the sample origin. Following this, a major advance was achieved when the electron microscopes could be adjusted with low electron doses, allowing the recording of diffraction diagrams from the electron beam-sensitive cellulose samples. Under these conditions, one could obtain information of cellulose itself and not, as before, of the contrasting agent. This important development applied to microdiffraction conditions revealed that some large cellulose microfibrils could yield spot diagrams typical of single crystals. Their recording led to a decisive progress for resolving the molecular and crystal structure of the two cellulose allomorphs, cellulose Ia and Ib. Using various combinations of diffracted beams to create the images, the so called "diffraction contrast images" could then be developed. These micrographs showed many aspects of the crystalline core of cellulose, including spectacular high-resolution images showing the molecular planes of cellulose in their crystalline environment. Today, electron diffraction, diffraction contrast imaging and low-dose electron microscopy have become major tools to follow the effect of various physical, chemical and biochemical processes at the cellulose crystalline level.

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Single crystals and oriented crystallization of ivory nut mannan

et al. 1979

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SynopsisThe preparation of lamellar single crystals of mannan[poly((l -4)-P-D-mannose)] is described. Electron diffractograms clearly identify the perpendicular orientation of the chain axis with respect to the lamellar surface. Since the degree of polymerization is 40 or less, no conclusion is made as to chain folding. The unit cell corresponds to the mannan I structure derived from x-ray fiber data on oriented algal mannan. The baseplane dimensions found were a = 7.22 8 and b = 8.92 8, and the systematic absences observed confirm the proposed P212121 group. It was found that cellulose microfibrils from Valonia uentricosa and bacterial cellulose could serve as extended chain nuclei for inducing oriented crystallization of mannan on cellulose. This produces a shish-kebab type of morphology.

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Shish kebab‐like structures of cellulose

Cited by 24 publications

References 8 publications

The chemical-free production of nanocelluloses from microcrystalline cellulose and their use as Pickering emulsion stabilizer

The chemical-free production of nanocelluloses from microcrystalline cellulose and their use as Pickering emulsion stabilizer

Transmission electron microscopy of cellulose. Part 1: historical perspective

Single crystals and oriented crystallization of ivory nut mannan

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