Critical discussion of light scattering and microscopy techniques for CNC particle sizing

Fraschini, Carole; Chauve, Grégory; Berre, Jean-François Le; Ellis, Steven G.; Méthot, Myriam; O’Connor, Brian I.; Bouchard, Jean

doi:10.3183/npprj-2014-29-01-p031-040

Cited by 43 publications

(29 citation statements)

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“…Nevertheless, these measurements 247 provide a useful approximation to average particle size in order to establish comparisons 248 between similar samples (Fraschini et al 2014 found for 65% acid, although in this case, cellulase positively influenced this parameter, 260 as well as it interacted with both time and temperature. 261…”

Section: Starting Fibers and Enzymatic Treatment 198mentioning

confidence: 99%

“…Concerning average particle size, generally, DLS measurements do not provide a real 245 measurement of particle size, particularly when considering rod-like structures such as 246 nanocrystalline cellulose (Fraschini et al 2014). Nevertheless, these measurements 247 provide a useful approximation to average particle size in order to establish comparisons 248 between similar samples (Fraschini et al 2014 found for 65% acid, although in this case, cellulase positively influenced this parameter, 260 as well as it interacted with both time and temperature.…”

Section: Starting Fibers and Enzymatic Treatment 198mentioning

confidence: 99%

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Optimization of sulfuric acid hydrolysis conditions for preparation of nanocrystalline cellulose from enzymatically pretreated fibers

et al. 2016

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21NCC preparation using sulfuric acid hydrolysis from cellulase pretreated fibers was optimized in 22 order to obtain the highest possible yield with 62% and 65% wt. sulfuric acid throughout two 23 statistical plans. At optimal conditions (10U/g odp cellulase, 25 min hydrolysis, 47 ºC and 62 % 24 wt. H 2 SO 4 ) high yields were obtained (≥80%) including an increase produced by enzyme of ~9 %. 25Optimal conditions produced nanosized particles of around ~200 nm with a reduced surface 26 charge and sulfur content. The performed optimization allowed reducing the hydrolysis time in a 27 44%, and also increasing yield in more than 10% compared to results exposed in previous works.

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Section: Starting Fibers and Enzymatic Treatment 198mentioning

confidence: 99%

Section: Starting Fibers and Enzymatic Treatment 198mentioning

confidence: 99%

Optimization of sulfuric acid hydrolysis conditions for preparation of nanocrystalline cellulose from enzymatically pretreated fibers

et al. 2016

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“…É pertinente salientar a importância de estudos de produção de nanocristais de celulose com tamanhos específicos ou de seleção das dimensões desses durante seu processo de purificação. Fraschini et al (2014) reportaram que, como já se iniciou a produção industrial de NCC com uma fábrica da CelluForce TM Inc., o tamanho das partículas logo se tornará um parâmetro de controle de qualidade tendo em vista uma possível legislação regulatória no futuro. Além disso, os pesquisadores também indicam a necessidade de os whiskers estarem bem dispersos na matriz em que serão colocados para a síntese de compósitos e, entre outros fatores, o tamanho da carga influenciará na dispersão.…”

Section: Comprimentounclassified

Efeito Da Etapa De Centrifugação No Tamanho De Nanocristais De Celulose

Soares¹,

Martins²,

Puiatti³

et al. 2017

The Journal of Engineering and Exact Sciences

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RESUMO: Investigou-se, utilizando a técnica de espalhamento dinâmico de luz depolarizado, a relação das propriedades dinâmicas de suspensões de nanocristais de celulose (NCC) com a força G de centrifugação aplicada no processo de purificação das mesmas. Amostras contendo NCC foram preparadas por meio de hidrólise com ácido sulfúrico e centrifugadas nas intensidades de 1840, 4140, 7370, 11510 e 16580 de força G. Determinou-se os coeficientes de difusão translacionais e rotacionais e, a partir destes, calculou-se as larguras (d) e os comprimentos (L) dos NCC. Os valores de L e de

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“…In the very recent work by Gamelas et al the DLS hydrodynamic diameter, as an equivalent spherical diameter, was used to estimate the nanofibrils length assuming a cylinder with the same volume and with the diameter (width) assessed by AFM (Gamelas et al 2015). In the work by Fraschini et al with the anizometric cellulose microfibrils or whiskers, the hydrodynamic radius determined by DLS was considered only as an indicative measure of the 'apparent' size of the dynamic hydrated/solvated particle (Fraschini et al 2014). It was also pointed that in the case of rod-like particles, such as cellulose nanocrystals, a slight change in the length will directly affect the measured DLS size while changes in the cross-section will hardly affect the diffusion velocity.…”

Section: Analysis By Sem and Dlsmentioning

confidence: 99%

“…The size distribution profile of acetylated MFC indicated a slight shift towards lower sizes for both fractions. Despite of high demand, the standard methods or validated techniques for the size evaluation of polydisperse nanomaterials with a high aspect ratio, including cellulose nanocrystals and nanofibrils, are still under development (Gamelas et al 2015;Fraschini et al 2014). In the very recent work by Gamelas et al the DLS hydrodynamic diameter, as an equivalent spherical diameter, was used to estimate the nanofibrils length assuming a cylinder with the same volume and with the diameter (width) assessed by AFM (Gamelas et al 2015).…”

Section: Analysis By Sem and Dlsmentioning

confidence: 99%

Biocomposites of polyamide 4.10 and surface modified microfibrillated cellulose (MFC): influence of processing parameters on structure and thermomechanical properties

2015

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Novel bio-polyamides obtained from renewable resources, e.g. PA4.10, are considered nowadays as promising 'green' engineering materials consisting of building blocks derived from castor oil. In this work the composites of heterogeneously acetylated microfibrillated cellulose (MFC) and biopolyamide 4.10 have been prepared by melt blending. Thermoplastic processing of PA4.10/MFC composites was possible in a narrow temperature window due to significant improvement of thermal stability of acetylated MFC as compared to raw MFC. The increase of thermooxidative stability of filler was due to removal of non-cellulosic components from the raw material and introduction of acetic moieties that had additional slight stabilizing effect on MFC. Moreover, the modified MFC showed significant changes in morphology that favoured its dispersibility in viscous polymer melt. Combined treatment of MFC by chemical agents, which caused partial hydrolysis of amorphous regions, and physical disintegration by ultrasonic waves resulted in formation of fibrous material with low degree of entanglement and submicron or nanometric diameters. In the tested range of screw speeds it was found that at screw speed of 100 rpm the shearing forces were sufficient for dispersing MFC agglomerates and the melt pressure secured evacuation of gases introduced to plasticizing system of extruder with MFC-Ac aerogel. The dynamic mechanical properties of obtained (nano)-composites were influenced by both mechanical strengthening of rigid cellulose micro and nanofibers as well as susceptibility of biopolymers towards oxidation and thermomechanical degradation during processing.

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Critical discussion of light scattering and microscopy techniques for CNC particle sizing

Cited by 43 publications

References 0 publications

Optimization of sulfuric acid hydrolysis conditions for preparation of nanocrystalline cellulose from enzymatically pretreated fibers

Optimization of sulfuric acid hydrolysis conditions for preparation of nanocrystalline cellulose from enzymatically pretreated fibers

Efeito Da Etapa De Centrifugação No Tamanho De Nanocristais De Celulose

Biocomposites of polyamide 4.10 and surface modified microfibrillated cellulose (MFC): influence of processing parameters on structure and thermomechanical properties

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