EPR spectroscopy applied to the study of the TEMPO mediated oxidation of nanocellulose

Buffa, Juan Manuel; Grela, M. A.; Aranguren, Mirta I.; Mucci, Verónica Luján

doi:10.1016/j.carbpol.2015.09.094

Cited by 24 publications

(6 citation statements)

References 26 publications

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“…After that, oxoammonium was reduced to form hydroxylamine (TEMPOH) as shown in Figure 4 (b). In this reaction, TEMPOH will be oxidized and TEMPO + will be recycled in the system (Buffa et al 2016).…”

Section: Resultsmentioning

confidence: 99%

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Surface Modification of Cellulose Nanomaterial for Urea Biosensor Application

Khalid¹,

Lee²,

Arip³

2018

JSM

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Cellulose nanomaterial with rod-like structure and highly crystalline order, usually formed by elimination of the amorphous region from cellulose during acid hydrolysis. Cellulose nanomaterial with the property of biocompatibility and nontoxicity can be used for enzyme immobilization. In this work, urease enzyme was used as a model enzyme to study the surface modification of cellulose nanomaterial and its potential for biosensor application. The cellulose nanocrystal (CNC) surface was modified using 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation to introduce the carboxyl group at C6 primary alcohol. The success of enzyme immobilization and surface modification was confirmed using chemical tests and measured using UV-Visible spectrophotometer. The immobilization strategy was then applied for biosensor application for urea detection. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques were used for electroanalytical characterization of the urea biosensor.

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Section: Resultsmentioning

confidence: 99%

“…(a) TEMPO-mediated oxidation method(Isogai & Kato 1998) (b) Reaction mechanism of TEMPO-mediated oxidation process(Buffa et al 2016;da Silva Perez et al 2003) …”

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confidence: 99%

Surface Modification of Cellulose Nanomaterial for Urea Biosensor Application

Khalid¹,

Lee²,

Arip³

2018

JSM

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“…CNCs were synthetized using the acid hydrolysis of MCC, according to a previously reported technique used in our laboratory [ 46 ]. MCC was added in distilled water and dispersed by mechanical stirring until the suspension was homogenized.…”

Section: Methodsmentioning

confidence: 99%

Nanocelluloses Reinforced Bio-Waterborne Polyurethane

et al. 2021

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The aim of this work was to evaluate the influence of two kinds of bio- nano-reinforcements, cellulose nanocrystals (CNCs) and bacterial cellulose (BC), on the properties of castor oil-based waterborne polyurethane (WBPU) films. CNCs were obtained by the acidolysis of microcrystalline cellulose, while BC was produced from Komagataeibacter medellinensis. A WBPU/BC composite was prepared by the impregnation of a wet BC membrane and further drying, while the WBPU/CNC composite was obtained by casting. The nanoreinforcement was adequately dispersed in the polymer using any of the preparation methods, obtaining optically transparent compounds. Thermal gravimetric analysis, Fourier-transform infrared spectroscopy, field emission scanning electron microscopy, dynamical mechanical analysis, differential scanning calorimetry, contact angle, and water absorption tests were carried out to analyze the chemical, physical, and thermal properties, as well as the morphology of nanocelluloses and composites. The incorporation of nanoreinforcements into the formulation increased the storage modulus above the glass transition temperature of the polymer. The thermal stability of the BC-reinforced composites was slightly higher than that of the CNC composites. In addition, BC allowed maintaining the structural integrity of the composites films, when they were immersed in water. The results were related to the relatively high thermal stability and the particular three-dimensional interconnected reticular morphology of BC.

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“…This would consequently enhance the macroscopic properties, such as the mechanical, barrier, and resistance properties . Generally, surface modification is usually performed by chemical treatment such as dewaxing, alkali treatment, graft copolymerization, silane treatment, etherification, acetylation, peroxide treatment, and isocyanates grafting …”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23][24] Generally, surface modification is usually performed by chemical treatment such as dewaxing, alkali treatment, graft copolymerization, silane treatment, etherification, acetylation, peroxide treatment, and isocyanates grafting. 22,[25][26][27][28][29][30][31] In the meantime, there is a simultaneous and growing interest in developing nanocomposites to improve the reinforcement and mechanical strength of polymeric composites. Nanocomposites use a matrix where the nanosized reinforcement elements with dimensions under 100 nm are dispersed.…”

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confidence: 99%

Nanocellulose reinforced as green agent in polymer matrix composites applications

Rashid

Julkapli

Yehye

2018

Polymers for Advanced Techs

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Owing to their abundance, high strength and stiffness, and low weight and biodegradability, nanocellulose (NC) is regarded as a promising candidate for the preparation of green composites. The high reinforcing effect assigned to the mechanical percolation phenomenon of NC is due to the stiff continuous networks of cellulosic nanoparticles linked via hydrogen bonding. Compared to nanocrystalline cellulose, NC fibers result in more significant improvement to the modulus, stiffness, and strength as aspect ratio NC fiber is higher compared to NC crystal. Indeed, in the case of biopolymer composites, the reinforcement effect of NC is attributed to the NC‐polymer interactions and the reinforcing effect occurring through effective stress transfer at the NC‐polymer interface. The NC‐reinforced composites tend to become more brittle as the concentration of the reinforcing particles increase up to the saturated level, due to the reduction in surface adhesion between filler and matrix. Due to its promising mechanical and structural stability, NC composites have been used widely in many industrial applications such as food packaging, electronic applications, and tissue engineering.

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EPR spectroscopy applied to the study of the TEMPO mediated oxidation of nanocellulose

Cited by 24 publications

References 26 publications

Surface Modification of Cellulose Nanomaterial for Urea Biosensor Application

Surface Modification of Cellulose Nanomaterial for Urea Biosensor Application

Nanocelluloses Reinforced Bio-Waterborne Polyurethane

Nanocellulose reinforced as green agent in polymer matrix composites applications

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