Impact of Carboxymethylation Pretreatment on the Rheology of Cellulose Nanofiber from Bleached Rice Hull

Zahra, Audrey; Gao, Shangmin; Park, Jong; Shin, Soo‐Jeong

doi:10.7584/jktappi.2022.06.54.3.63

Cited by 1 publication

(2 citation statements)

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“…This decrease in zeta potential is due to the increased carboxyl group composition. Similarly, carboxymethylated bleached rice hulls CNF exhibited the same decreasing trend as the DS increased from DS 0.2 (−49.1 mV) to DS 0.4 (−55.8 mV) [13]. However, the decrease in zeta potential is attributed to the varying compositions of these materials.…”

Section: Zeta Potential Of Various Lcnf Ds Desilicated Rice Hullmentioning

confidence: 75%

“…Therefore, chemical pretreatment is a viable method for achieving nano fibrillation in cellulosic materials, as it reduces the energy required for the process. Carboxymethylation and TEMPO-oxidation are the most commonly used chemical pretreatment methods [12,13]. After pretreatment, cellulose material was nanofibrillated by the mechanical process using a grinding by supermass-collider or high-pressure homogenization processes [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Lignocellulose Nanofibril from Desilicated Rice Hull with Carboxymethylation Pretreatment

Zahra,

Lim,

Shin

2024

Polysaccharides

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Rice hulls have a high-value potential, and the lignocellulose components are underutilized compared to other biomass resources. Pretreatments such as carboxymethylation of the degree of substitutions (DS) are used to prepare lignocellulose nanofibril (LCNF) from desilicated rice hull (DSRH). High-pressure homogenization (HPH) and grinding are used to process nano fibrillation. The composition of LCNF DS of desilicated rice hull was identified using 1H NMR for polysaccharide composition and DS determination, acetone and hot water extraction to evaluate extractives, and Klason lignin for lignin content. LCNF was prepared using various DS from 0.2 until DS 0.4. The results showed that LCNF DS has a more than −30 mV zeta potential, suitable for stable nanoemulsion formulations. The particle size of LCNF DS decreases with an increasing carboxyl content in the hydrogel and an increasing number of passes through grinding and high-pressure homogenization, of which LCNF DS 0.4 had the smallest width and length. Mechanical processes further reduced the size.

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Section: Zeta Potential Of Various Lcnf Ds Desilicated Rice Hullmentioning

confidence: 75%