Effects of ultrasonic treatment during acid hydrolysis on the yield, particle size and structure of cellulose nanocrystals

Guo, Juan; Guo, Xuxia; Wang, Siqun; Yin, Yafang

doi:10.1016/j.carbpol.2015.08.068

Cited by 128 publications

(64 citation statements)

References 39 publications

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“…Three replications were applied in each group of experiments in order to confirm the good reproducibility. The yield of CNC Cr(NO3)3 was determined by gravimetric analysis, as described elsewhere [9]. …”

Section: Methodsmentioning

confidence: 99%

“…Due to its high availability and remarkable properties, nanocellulose is anticipated to be as cost effective as prominent candidates to replace conventional petroleum-based polymers in various potential applications, such as bio-nanocomposites, biodegradable composites, and polymer matrixes [8]. Other potential applications of this green material include barrier films, pharmaceutical and medical applications, surface coatings, textiles and fibers, separation membrane, electroactive polymers, supercapacitors, batteries, food packaging, food additive, drug delivery, biosensors and enzyme immobilizations [9,10]. Thus, nanocellulose manufacture is currently an interesting field to study.…”

Section: Introductionmentioning

confidence: 99%

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Easy Fabrication of Highly Thermal-Stable Cellulose Nanocrystals Using Cr(NO3)3 Catalytic Hydrolysis System: A Feasibility Study from Macro- to Nano-Dimensions

et al. 2017

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This study reported on the feasibility and practicability of Cr(NO3)3 hydrolysis to isolate cellulose nanocrystals (CNCCr(NO3)3) from native cellulosic feedstock. The physicochemical properties of CNCCr(NO3)3 were compared with nanocellulose isolated using sulfuric acid hydrolysis (CNCH2SO4). In optimum hydrolysis conditions, 80 °C, 1.5 h, 0.8 M Cr(NO3)3 metal salt and solid–liquid ratio of 1:30, the CNCCr(NO3)3 exhibited a network-like long fibrous structure with the aspect ratio of 15.7, while the CNCH2SO4 showed rice-shape structure with an aspect ratio of 3.5. Additionally, Cr(NO3)3-treated CNC rendered a higher crystallinity (86.5% ± 0.3%) with high yield (83.6% ± 0.6%) as compared to the H2SO4-treated CNC (81.4% ± 0.1% and 54.7% ± 0.3%, respectively). Furthermore, better thermal stability of CNCCr(NO3)3 (344 °C) compared to CNCH2SO4 (273 °C) rendered a high potential for nanocomposite application. This comparable effectiveness of Cr(NO3)3 metal salt provides milder hydrolysis conditions for highly selective depolymerization of cellulosic fiber into value-added cellulose nanomaterial, or useful chemicals and fuels in the future.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Easy Fabrication of Highly Thermal-Stable Cellulose Nanocrystals Using Cr(NO3)3 Catalytic Hydrolysis System: A Feasibility Study from Macro- to Nano-Dimensions

et al. 2017

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“…The Analysis of Variance (ANOVA), a particular form of statistical hypothesis testing for comparing three or more groups for statistical significance (Shapiro andWilk 1965, Yin et al 2011;Guo et al 2016), was also applied to our data using an SAS program (SAS Institute 9.0, USA). Least-significant-difference tests were used.…”

Section: Data Statistical Analysismentioning

confidence: 99%

The influence of thermo-hygro-mechanical treatment on the micro- and nanoscale architecture of wood cell walls using small- and wide-angle X-ray scattering

et al. 2016

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Tracking the changes of cellulose crystallites upon thermo-hygro-mechanical treatment is essential to understand the response of wood cell walls to steam and compression. In this paper the influence of Compression combined with Steam (CS) treatment on wood cellulose crystallites and pores structure of Chinese fir (Cunninghamia lanceolata) was studied under different steaming temperatures and compression ratios. Small-angle X-ray scattering and wide-angle X-ray scattering were used to investigate the changes of cellulose crystallites dimension, aspect ratio, fibril diameter distribution, non-crystalline fraction, the number of chains in each microfibril, as well as the fractal dimension and size of pores in response to CS treatment conditions. Results indicate that the crystallinity increased due to CS treatment, but did not show alteration with varying CS treatment conditions, i.e. seemed nearly unaffected by higher temperatures or compression ratio, both for earlywood and latewood. The cellulose crystallite diameter depended on processing parameters: it increased with increasing treatment temperature. No considerable differences were found for earlywood and latewood. We interpret our findings as a rearrangement of adjacent cellulose chains towards higher crystalline perfection attributing to the increase in crystallinity. The same effect allows a larger coherence length of crystalline order and therefore features an increasing cross-sectional dimension. In general we can state that the CS treatment leads to higher crystallinity and more perfectly arranged cellulose crystals, while it does not greatly affect the microfibril diameter but rather the amorphous regions of the microfibrils and the surrounding hemicellulose and lignin.

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“…3A. All of the diffractograms showed a sharp peak and a small peak at 21.5° and 34.9°, which represented the diffraction planes of (002) and (040), respectively, are characteristic of cellulose I (Cave 1997;Guo et al 2016). A weak peak in the diffraction pattern of typical cellulose I was not clearly observed in Fig.…”

Section: Xrd and Ftir Analysis Of The Corn Bran Samplesmentioning

confidence: 86%

Enhanced Polysaccharides Yield Obtained from Hydrothermal Treatment of Corn Bran via Twin-screw Extrusion

Liu¹,

Li²,

Wei³

2017

BioResources

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Lignocellulosic biomass, such as corn bran, has limited accessibility to solvents during thermal-chemical processes. However, a pretreatment can help to change the characteristics of the raw material and improve the yield of the polysaccharides. A twin-screw extrusion pretreatment was developed to enhance the polysaccharide yield and decrease the optimum temperature and time during the hydrothermal treatment of corn bran. The effects of temperature and time on the polysaccharide yield were investigated during the hydrothermal treatment with pretreated and unpretreated corn bran. All samples were comparatively analyzed by Xray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and thermogravimetric analysis to investigate the changes in the chemical and physical characteristics. The results showed that the twin-screw extrusion pretreatment changed the main physical structure and thermochemical behavior of corn bran, which confirmed that it could enhance the polysaccharide yield and decrease the optimum treatment temperature and reduce the process duration. The pretreatment and the hydrothermal treatment temperature also had a synergetic effect on extraction yield and the composition of polysaccharide fractions of corn bran compared to the unpretreated sample. This study contributes to the knowledge improvement of corn bran pretreatments, which can be used for the efficient production of polysaccharides.

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Effects of ultrasonic treatment during acid hydrolysis on the yield, particle size and structure of cellulose nanocrystals

Cited by 128 publications

References 39 publications

Easy Fabrication of Highly Thermal-Stable Cellulose Nanocrystals Using Cr(NO3)3 Catalytic Hydrolysis System: A Feasibility Study from Macro- to Nano-Dimensions

Easy Fabrication of Highly Thermal-Stable Cellulose Nanocrystals Using Cr(NO3)3 Catalytic Hydrolysis System: A Feasibility Study from Macro- to Nano-Dimensions

The influence of thermo-hygro-mechanical treatment on the micro- and nanoscale architecture of wood cell walls using small- and wide-angle X-ray scattering

Enhanced Polysaccharides Yield Obtained from Hydrothermal Treatment of Corn Bran via Twin-screw Extrusion

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