Effect of xylan in hardwood pulp on the reaction rate of TEMPO-mediated oxidation and the rheology of the final nanofibrillated cellulose gel

Pääkkönen, Timo; Dimić-Mišić, Katarina; Orelma, Hannes; Pönni, Raili; Vuorinen, Tapani; Maloney, Thaddeus

doi:10.1007/s10570-015-0824-7

Cited by 59 publications

(66 citation statements)

References 83 publications

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“…[41]. The high-xylan CNFs produced in our work contained only approximately 40 μmol/g of carboxyl groups, which was much lower than the reported data for other CNFs using oxidizing reagents, such as a TEMPO-mediated system, with the similar amount of xylan [41]. The zeta-potential of imidazole liberated nanocelluloses reached ca.…”

Section: Product Composition and Surface Analysiscontrasting

confidence: 64%

Imidazole, a New Tunable Reagent for Producing Nanocellulose, Part I: Xylan-Coated CNCs and CNFs

et al. 2017

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Abstract:Imidazole is reported to be an effective reactant for the production of nanocellulose from hardwood pulp. The morphologies and surface properties of the nanocellulose can be simply tailored according to the water content in the imidazole system: with pure imidazole, cellulose nanofibrils (CNFs) in a yield of 10 wt % can be produced. With 25 wt % of water in imidazole, cellulose nanocrystals (CNCs) are obtained in 20 wt % yield. Both nanocelluloses exhibit crystallinity indices in the order of 70%. Interestingly, they retain the original xylan from the pulp with ca. 9-10 wt % of residual xylan content.

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Section: Product Composition and Surface Analysiscontrasting

confidence: 64%

Imidazole, a New Tunable Reagent for Producing Nanocellulose, Part I: Xylan-Coated CNCs and CNFs

et al. 2017

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“…These properties are opening new opportunities for NFC applications in areas that include the food industry, papermaking, pharmaceutical/medical, and composites/nanocomposites among others [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…NFC can be produced by applying a mechanical treatment such as high-pressure homogenization, microfluidization, grinding, and ultrasonication, to bleached pulps [3]. One important disadvantage of any mechanical treatment is its high energy consumption which has been addressed applying a preliminary pretreatment.…”

Section: Introductionmentioning

confidence: 99%

Nanofibrillated Cellulose from Appalachian Hardwoods Logging Residues as Template for Antimicrobial Copper

Hassanzadeh

Sabo

Rudie

et al. 2017

Journal of Nanomaterials

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TEMPO nanofibrillated cellulose (TNFC) from two underutilized Appalachian hardwoods, Northern red oak (Quercus rubra) and yellow poplar (Liriodendron tulipifera), was prepared to determine its feasibility to be used as template for antimicrobial metallic copper particles. In addition, a comparison of the TNFC from the two species in terms of their morphological, chemical, thermal, and mechanical properties was also performed. The woody biomass was provided in the form of logging residue from Preston County, West Virginia. A traditional kraft process was used to produce the pulp followed by a five-stage bleaching. Bleached pulps were then subjected to a TEMPO oxidation process using the TEMPO/NaBr/NaClO system to facilitate the final mechanical fibrillation process and surface incorporation of metallic copper. The final TNFC diameters for red oak and yellow poplar presented similar dimensions, 3.8 ± 0.74 nm and 3.6 ± 0.85 nm, respectively. The TNFC films fabricated from both species exhibited no statistical differences in both Young's modulus and the final strength properties. Likely, after the TEMPO oxidation process both species exhibited similar carboxyl group content, of approximately 0.8 mmol/g, and both species demonstrated excellent capability to incorporate antimicrobial copper on their surfaces.

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“…With the Tikhonov regularization based smoothing method we obtained suitable rheograms for determining rheological parameters, as described in detail and defined in our previous work, using the following transformations:

A \vec{x} = \vec{y}

where A is a matrix and

\overset{x}{true}

\overset{y}{true}

vectors. In eq.…”

Section: Rheological Measurementsmentioning

confidence: 99%

“…Rheograms were constructed from the representative measurements (after smoothing), while at least five samples were included in the analysis. Data variation of ÅA‐GWR was within ± 5%, while for rheometer and dynamic dewatering (IMC) within ± 7–10%, strongly related to the varied nature of the materials spanning the geometry, in particular the particulate size and physical interactions, leading to the likely presence of shear inhomogeneity in the plate–plate geometry contributing to reduced reproducibility, including the potential for wall slip and the glassy low friction state within the suspension …”

Section: Rheological Measurementsmentioning

confidence: 99%

Gel structure phase behavior in micro nanofibrillated cellulose containing in situ precipitated calcium carbonate

Dimić-Mišić

Rantanen

Maloney

et al. 2016

J of Applied Polymer Sci

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Speciality high‐strength board, packaging grades, and novel cellulose‐based nanocomposites may incorporate microcellulosic nanofibrillated materials (MNFC), although the rheological properties of such strongly water sorbing structures are challenging for processing technologies. This study introduces rheological methods for the evaluation of dewatering and flow behavior of such high consistency furnishes to exemplify the effect of energy input on microfibrillar material (MFC), as produced by a combination of enzymatic pretreatment and increased levels of fluidization. The large number of fibril contact points act to entrap water, held both on the fibril surface as immobilized water and in the interfibril spacing forming the gel structure. Tuning of the rheological and dewatering properties has been enabled by in situ precipitation of calcium carbonate filler (in situ PCC) on the MFC, which results in the production of a more uniform furnish. Such in situ PCC coated MFC fibrils incorporated into furnish were seen to increase dewatering rate over that of the furnish mix without the in situ precipitated filler primarily because of the reduction in total surface area of the fibers and fibrils when the pigment is present on the fibrillary surface. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43486.

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Effect of xylan in hardwood pulp on the reaction rate of TEMPO-mediated oxidation and the rheology of the final nanofibrillated cellulose gel

Cited by 59 publications

References 83 publications

Imidazole, a New Tunable Reagent for Producing Nanocellulose, Part I: Xylan-Coated CNCs and CNFs

Imidazole, a New Tunable Reagent for Producing Nanocellulose, Part I: Xylan-Coated CNCs and CNFs

Nanofibrillated Cellulose from Appalachian Hardwoods Logging Residues as Template for Antimicrobial Copper

Gel structure phase behavior in micro nanofibrillated cellulose containing in situ precipitated calcium carbonate

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