Dispersibility of Nanocrystalline Cellulose in Organic Solvents

Воронова, М. И.; Суров, О. В.; Рублева, Н. В.; Кочкина, Наталья Евгеньевна; Захаров, А. Г.

doi:10.14258/jcprm.2019014240

Cited by 1 publication

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References 45 publications

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“…10a and 10b of the CNC lm surface indicate individual rod-like CNC particles as well as particle aggregates. Few researches found particle aggregation as well [17,37]. Clear aggregation is visible in Fig.…”

Section: Atomic Force Microscopy (Afm) Analysismentioning

confidence: 95%

Morphological, Spectroscopic and Thermal Analysis of Cellulose Nanocrystals Extracted from Waste Jute Fiber by Acid Hydrolysis

Rana

Mosharraf

Rahim

et al. 2022

Preprint

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Natural cellulose, a sustainable bioresource, is highly abundant in nature. Cellulosic materials, particularly those that explore and employ such materials for industrial use, have recently attracted significant global attention in the field of material science because of the special properties of cellulose. The hydroxyl groups enable the formation of intra- and intermolecular hydrogen bonding as well as the arrangement of cellulose chains in a highly ordered crystalline zone, with the remaining disordered structure being referred to as an amorphous region. The crystalline areas of cellulose are well-known as cellulose nanocrystals (CNCs). In the present study, we extracted CNCs from pure cellulose isolated from waste jute fibers by sulphuric acid hydrolysis followed by characterization. Pure cellulose was isolated from jute fibers by treating with sodium hydroxide (20% w/w) and anthraquinone (0.5%) solution at 170 ⁰C for 2 hours, followed by bleaching with chlorine dioxide and hydrogen peroxide solution. CNCs were isolated from pure cellulose by treating with different concentrations (58–62%) of sulphuric acid at different time intervals (20 min to 45 min). FTIR study of the CNCs reveals no peak at 1738 cm− 1 which confirms the absence of hemicellulose in the samples. The CNCs obtained after 45 mins of acid hydrolysis are rod-shaped, having an average length of 800 ± 100 nm and width of 55 ± 10 nm with high crystallinity index (90%). Zeta potential greatly increased due to the attachment of SO42− ion on the surface of CNC from − 1.0mV to about − 30mV with the increment of reaction time from 20 min to 45 min, which proved the higher stability of CNC suspension. Crystallinity increased from 80–90% when the reaction time was increased from 20 to 45 mins, respectively, while crystallite size from 2.705 to 4.56 nm was obtained with an increment of acid concentration. Acid hydrolysis enhanced crystallinity but attenuated the temperature corresponding to major decomposition (Tmax) at 260 ⁰C and beginning of degradation (Ti) at 200 ⁰C due to the attachment of SO42− ion on the surface decreased the thermal stability of CNC. The second degradation at 360 ⁰C indicated the stable crystal structure of CNC. The endothermic peak at 255 ⁰C in the DTA study provided evidence of sulphated nanocrystal decomposition and the recrystallization of Cellulose Ⅰ to cellulose Ⅱ, the most stable structure among the other four cellulose.

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Section: Atomic Force Microscopy (Afm) Analysismentioning

confidence: 95%