A technique for production of nanocrystalline cellulose with a narrow size distribution

Bai, Wen Jie; Holbery, James D.; Li, Kaichang

doi:10.1007/s10570-009-9277-1

Cited by 263 publications

(125 citation statements)

References 18 publications

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“…On a laboratory scale, centrifugation is often used to increase the solid content during washing of the particles, however, the solid content is typically remains in the range 0.2-3 wt% (e.g. Á vila Ramírez et al 2017;Bai et al 2009;Cranston and Gray 2006;Kedzior et al 2016). Many industrial applications require that this solid content is increased and different drying methods, such as thermal, freeze and supercritical drying, can be used to obtain a dry material (Peng et al 2012(Peng et al , 2013.…”

Section: Introductionmentioning

confidence: 99%

Electroosmotic dewatering of cellulose nanocrystals

et al. 2018

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One of the main challenges for industrial production of cellulose nanocrystals is the high energy demand during the dewatering of dilute aqueous suspensions. It is addressed in this study by utilising electroosmotic dewatering to increase the solid content of suspensions of cellulose nanocrystals. The solid content was increased from 2.3 up to 15.3 wt%, i.e. removal of more than 85% of all the water present in the system, at a much lower energy demand than that of thermal drying. Increasing the strength of the electric field increased not only the dewatering rate but also the specific energy demand of the dewatering operation: the electric field strength used in potential industrial applications is thus a trade-off between the rate of dewatering and the energy demand. Additionally, it was found that high local current intensity had the potential of degrading cellulose nanocrystals in contact with the anode. The maximum strength of the electric field applied should therefore be limited depending on the equipment design and the suspension conditions.

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Section: Introductionmentioning

confidence: 99%

Electroosmotic dewatering of cellulose nanocrystals

et al. 2018

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“…[4][5][6][7][8][9][10][11][12]. These particles can be made by treatment of initial cellulose samples with concentrated sulfuric acid (SA) at various temperatures and following mechanical or ultrasound disintegration of the acid-treated cellulose in water [2,[13][14][15][16][17][18][19][20][21]. For disintegration step the high-pressure homogenizers, high-shear mills or ultrasound disintegrators giving an increased local pressure P ≥ 50MPa are used.…”

Section: Introductionmentioning

confidence: 99%

Optimal Conditions for Isolation of Nanocrystalline Cellulose Particles

Ioelovich¹

2012

116

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Nanocrystalline cellulose particles are new class of cellulose materials that can find the wide application in various technical areas, biotechnology and medicine. The nanoparticles are usually made by treatment or initial cellulose samples with concentrated sulfuric acid (SA) at various temperatures and following mechanical or ultrasound disintegration. Unfortunately, conditions of existing methods for preparation of nanocellulose are multifarious and give both crystalline and amorphous nanoparticles. Therefore in this paper the optimal conditions for obtaining just of nanocrystalline cellulose particles (NCP) have been studied. The experiment showed that isolation of NCP is carried out in narrow interval of the acid concentration: from 50 to about 61 wt. %. If concentration of SA is less than 50 wt. % then micro-scale particles are isolated. On the other hand, if concentration of SA is higher than 63 wt. % the cellulose completely dissolves, and as a result instead of nanocrystalline the amorphous particles are formed with decreased yield. In the range of the acid concentration from 55 to 61 wt. %, a low decrystallization of the initial cellulose is taken place that contributes to forming of rod-like nanocrystalline cellulose particles. The following optimal conditions of the acidic treatment for isolation of NCP were proposed: concentration of sulfuric acid 57-60 wt. %, acid to cellulose ratio 8-10, temperature [45][46][47][48][49][50][51][52][53][54][55] o C, time 40-60 min. These optimal conditions in combination with the high-power disintegration permit obtaining the rod-like nanocrystalline cellulose particles (150-200 x 10-20 nm) with the increased yield (70-75%).

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“…The nature of the acid and the acid-to-cellulosic fibers ratio are also important parameters that affect the preparation of NCCs (Elazzouzi-Hafraoui et al, 2007;Son & Seo, 2015). A resulting suspension is subsequently diluted with water and washed with successive centrifugations (Bai, Holbery, & Li, 2009). Dialysis against distilled water is then performed to separate the NCC from the acid solution (de Souza Lima & Borsali, 2002).…”

Section: Introductionmentioning

confidence: 99%