Journal ArticleDOI
Green Strategy Guided by Raman Spectroscopy for the Synthesis of Ammonium Carboxylated Nanocrystalline Cellulose and the Recovery of Byproducts
Edmond Lam,Alfred C. W. Leung,Yali Liu,Ehsan Majid,Sabahudin Hrapovic,Keith B. Male,John H. T. Luong +6 more
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TLDR
In this article, a one-pot green procedure for the treatment of cellulosic biomass with ammonium persulfate (APS) was developed for the synthesis of highly crystalline carboxylated nanocrystalline cellulose (NCC-COOH), an emerging nanomaterial with a plethora of diversified applications.Abstract:
A one-pot green procedure for the treatment of cellulosic biomass with ammonium persulfate (APS) was developed for the synthesis of highly crystalline carboxylated nanocrystalline cellulose (NCC–COOH), an emerging nanomaterial with a plethora of diversified applications. Raman spectroscopy proved applicable for monitoring the fate of APS and its two byproducts during the production of NCC–COOH from microcrystalline cellulose (MCC). The two main byproducts were then identified and quantified as ammonium sulfate (AS) and H2SO4 with the latter accounted for 60% of the total sulfate ions in solution. On the basis of such findings, one-step neutralization of H2SO4 and NCC with NH4OH immediately after reaction was implemented for the formation of additional AS, followed by its quantitative recovery by precipitation. This was a very effective and critical step in waste stream management and cost reduction for the large scale production of NCC. In addition, the process resulted in highly crystalline NCC with COO–...read more
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Facile One-step Fabrication of Functional Cellulose Nanocrystals with High Efficiency under Microwave-ultrasound Synergy
TL;DR: Based on the mechanochemical mechanism, an efficient and green approach to cleave hydrogen bonds and fabricate functional cellulose nanocrystals was realized via microwave-ultrasound synergy as discussed by the authors.
Journal ArticleDOI
One-step extraction of cellulose nanocrystals from high lignin biomass through ammonium persulfate oxidation method
TL;DR: In this article , ammonium persulfate (APS) was used to oxidize empty fruit bunch (EFB), an agricultural waste from palm oil, for 15 h to undergo the oxidation process, and the result showed that lignin and hemicellulose in the EFB were successfully removed with minimum APS concentration of 1.5 M.
Journal ArticleDOI
Unbleached cellulose from waste corncob for isolation of cellulose nanocrystals
Santos VenturaEdgar Mauricio,Escalante ÁlvarezMarcos Alfredo,Gutiérrez BecerraAlberto,Sulbarán-RangelBelkis +3 more
TL;DR: Unbleached cellulose obtained from corncobs was used to synthesize cellulose nanocrystals (CNCs) as discussed by the authors, which is an agro-industrial residue that has a high cellulose content and can be used as a raw material.
Journal ArticleDOI
Bacterial nanocellulose as green support of platinum nanoparticles for effective methanol oxidation.
Marijana Ponjavic,R.M. Stevanović,Jasmina Nikodinovic-Runic,Sanja Jeremic,Vladan Ćosović,Vesna Maksimović +5 more
TL;DR: In this paper , microwave assisted synthesis for the first time for platinum nanoparticles supported on BNC as green material has been reported, where Pt/BNC catalyst has high electrocatalytic performance in methanol oxidation reaction.
Journal ArticleDOI
Large-Scale Preparation of Carboxylated Cellulose Nanocrystals and Their Application for Stabilizing Pickering Emulsions
TL;DR: In this paper , a high-efficiency and large-scale preparation strategy was developed to produce carboxylated cellulose nanocrystals (Car-CNCs) via carboxymethylation-enhanced ammonium persulfate (APS) oxidation.
References
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Journal ArticleDOI
An Empirical Method for Estimating the Degree of Crystallinity of Native Cellulose Using the X-Ray Diffractometer
TL;DR: In this paper, an empirical method for determining the crystallinity of native cellulose was studied with an x-ray diffractometer using the focusing and transmission techniques, and the influence of fluctuations in the primary radiation and in counting and recording processes have been determined.
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Cellulose nanomaterials review: structure, properties and nanocomposites
Robert J. Moon,Robert J. Moon,Ashlie Martini,John A. Nairn,John Simonsen,Jeffrey P. Youngblood +5 more
TL;DR: This critical review provides a processing-structure-property perspective on recent advances in cellulose nanoparticles and composites produced from them, and summarizes cellulOSE nanoparticles in terms of particle morphology, crystal structure, and properties.
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Cellulose nanocrystals: chemistry, self-assembly, and applications.
TL;DR: Dr. Youssef Habibi’s research interests include the sustainable production of materials from biomass, development of high performance nanocomposites from lignocellulosic materials, biomass conversion technologies, and the application of novel analytical tools in biomass research.
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Nanocelluloses: A New Family of Nature-Based Materials
D. Klemm,Friederike Kramer,Sebastian Moritz,Tom Lindström,Mikael Ankerfors,Derek G. Gray,Annie Dorris +6 more
TL;DR: This Review assembles the current knowledge on the isolation of microfibrillated cellulose from wood and its application in nanocomposites; the preparation of nanocrystalline cellulose and its use as a reinforcing agent; and the biofabrication of bacterial nanocellulose, as well as its evaluation as a biomaterial for medical implants.
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Homogeneous suspensions of individualized microfibrils from TEMPO-catalyzed oxidation of native cellulose.
TL;DR: Never-dried native celluloses (bleached sulfite wood pulp, cotton, tunicin, and bacterial cellulose) were disintegrated into individual microfibrils after oxidation mediated by the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical followed by a homogenizing mechanical treatment.