Modified ammonium persulfate oxidations for efficient preparation of carboxylated cellulose nanocrystals

Liu, Yunxiao; Liu, Lehuan; Wang, Kuntao; Zhang, Hui; Yuan, Yuan; Wei, Hongxiu; Wang, Xin; Duan, Yongxin; Zhou, Lijuan; Zhang, Jianming

doi:10.1016/j.carbpol.2019.115572

Cited by 71 publications

(33 citation statements)

References 37 publications

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“…A limitation to the APS method by Luong and co-workers is the large amount of APS required for biomass conversion (22.8 g APS per g of biomass) and the long reaction time (minimum of 16 h) [ 20 ]. Liu and co-workers investigated the use of N , N , N ’, N ’-tetramethylethylenediamine (TMEDA) and ultrasonic-assisted disintegration to address the economic issues of the APS oxidation [ 37 ]. Under the conventional APS method, a single type of free radical is produced (SO 4 · − ), which Liu et al believe results in the relatively weak hydrolysis ability of APS, necessitating a higher loading of the oxidant and longer reaction times to produce cCNCs.…”

Section: Production Of Ccncsmentioning

confidence: 99%

Preparation and Surface Functionalization of Carboxylated Cellulose Nanocrystals

Lam

Hemraz

2021

Nanomaterials

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In recent years, cellulose nanocrystals (CNCs) have emerged as a leading biomass-based nanomaterial owing to their unique functional properties and sustainable resourcing. Sulfated cellulose nanocrystals (sCNCs), produced by sulfuric acid-assisted hydrolysis of cellulose, is currently the predominant form of this class of nanomaterial; its utilization leads the way in terms of CNC commercialization activities and industrial applications. The functional properties, including high crystallinity, colloidal stability, and uniform nanoscale dimensions, can also be attained through carboxylated cellulose nanocrystals (cCNCs). Herein, we review recent progress in methods and feedstock materials for producing cCNCs, describe their functional properties, and discuss the initial successes in their applications. Comparisons are made to sCNCs to highlight some of the inherent advantages that cCNCs may possess in similar applications.

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Section: Production Of Ccncsmentioning

confidence: 99%

Preparation and Surface Functionalization of Carboxylated Cellulose Nanocrystals

Lam

Hemraz

2021

Nanomaterials

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“…This effect resulted from the surface charge difference between APS and AIBN. It is noted that APS is negatively charged due to the presence of persulfate anions generated from the following decomposition process [ 30 ], as shown in Figure 7 , whereas AIBN exhibits neutral surface charge.…”

Section: Resultsmentioning

confidence: 99%

Development of Thermally Responsive PolyNIPAm Microcarrier for Application of Cell Culturing—Part I: A Feasibility Study

et al. 2021

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Poly(N-isopropylacrylamide) (polyNIPAm) microspheres were synthesized via the suspension polymerization technique. Thermal and redox initiators were compared for the polymerization, in order to study the effect of initiator type on the surface charge and particle size of polyNIPAm microspheres. The successful polymerization of NIPAm was confirmed by FTIR analysis. Microspheres of diameter >50 µm were synthesized when a pair of ammonium persulfate (APS) and N,N,N’,N’-tetramethylene-diamine (TEMED) redox initiators was used, whilst relatively small microspheres of ~1 µm diameter were produced using an Azobis-isobutyronitrile (AIBN) thermal initiator. Hence, suspension polymerization using a redox initiator pair was found to be more appropriate for the synthesis of polyNIPAm microspheres of a size suitable for human embryonic kidney (HEK) cell culturing. However, the zeta potential of polyNIPAm microspheres prepared using an APS/TEMED redox initiator was significantly more negative than AIBN thermal initiator prepared microspheres and acted to inhibit cell attachment. Conversely, strong cell attachment was observed in the case of polyNIPAm microspheres of diameter ~90 µm, prepared using an APS/TEMED redox initiator in the presence of a cetyl trimethyl ammonium bromide (CTAB) cationic surfactant; demonstrating that surface charge modified polyNIPAm microspheres have great potential for use in cell culturing.

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“…Furthermore, the peak observed at 900-895 cm -1 in all spectra could be attributed to the glycosidic bonds related to C 1 -H deformation vibrations which are symmetric in polysaccharides, represents the β -glucosidic linkage between the anhydroglucose rings in the cellulose chains (El Achaby et al, 2018;Jiang et al, 2017;Liu et al, 2019;Ng et al, 2015;Oun and Rhim, 2017).…”

Section: Atr-ftir Analysis Of Recycled Mdf Fibers and Carboxylated-cncsmentioning

confidence: 99%

Characterization of Carboxylated Cellulose Nanocrystals from Recycled Fiberboard Fibers Using Ammonium Persulfate Oxidation

Khanjanzadeh¹,

Park²

2020

Journal of the Korean Wood Science and Technology

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As a way of finding value-added materials from waste medium density fiberboard (MDF), this study characterized cellulose nanocrystals (CNCs) isolated by ammonium persulfate (APS) oxidation using recycled MDF fibers. Chemical composition of the recycled MDF fibers was done to quantify α-cellulose, hemicellulose, lignin, nitrogen, ash and extractives. The APS oxidation was performed at 60 °C for 16 h, followed by ultrasonication, which resulted in a CNC yield of 11%. Transmission electron microscope images showed that rod-like CNCs had an average length and diameter of 167±47 nm and 8.24±2.28 nm, respectively, which gave an aspect ratio of about 20. The conductometric titration of aqueous CNCs suspension resulted in a carboxyl content of 0.24 mmol/g and the degree of oxidation was 0.04. Attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy clearly showed the presence of carboxyl group on the CNCs prepared by the APS oxidation. The change of pH of the aqueous CNC suspension from 4 to 7 converted the carboxyl group to sodium carboxylate group. These results showed that the APS oxidation was facile and CNCs had a one-step preparation method, and thus suggested an optimization of the oxidation condition in future.

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Modified ammonium persulfate oxidations for efficient preparation of carboxylated cellulose nanocrystals

Cited by 71 publications

References 37 publications

Preparation and Surface Functionalization of Carboxylated Cellulose Nanocrystals

Preparation and Surface Functionalization of Carboxylated Cellulose Nanocrystals

Development of Thermally Responsive PolyNIPAm Microcarrier for Application of Cell Culturing—Part I: A Feasibility Study

Characterization of Carboxylated Cellulose Nanocrystals from Recycled Fiberboard Fibers Using Ammonium Persulfate Oxidation

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