Obtaining Cellulose Nanofibers with a Uniform Width of 15 nm from Wood

Abe, Kentaro; Iwamoto, Shinichiro; Yano, Hiroyuki

doi:10.1021/bm700624p

Cited by 833 publications

(479 citation statements)

References 25 publications

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“…Therefore, given this restraint, one has been left to ponder with secondary and often very conflicting data on the contribution of flocs (Abe et al 2007). With macroscopic cellulose suspensions, imaging studies have been conducted by several authors (e.g.…”

Section: Introductionmentioning

confidence: 99%

Flocculated flow of microfibrillated cellulose water suspensions: an imaging approach for characterisation of rheological behaviour

et al. 2012

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Our aim was to characterise the suspension rheology of microfibrillated cellulose (MFC) in relation to flocculation of the cellulose fibrils. Measurements were carried out using a rotational rheometer and a transparent cylindrical measuring system that allows combining visual information to rheological parameters. The photographs were analyzed for their floc size distribution. Conclusions were drawn by comparing the photographs and data obtained from measurements. Variables selected for examination of MFC suspensions were degree of disintegration of fibres into microfibrils, the gap between the cylinders, sodium chloride concentration, and the effects of changing shear rate during the measurement. We studied changes in floc size under different conditions and during network structure decomposition. At rest, the suspension consisted of flocs sintered together into a network. With shearing, the network separated first into chain-like floc formations and, upon further shear rate increase, into individual spherical flocs. The size of these spherical flocs was inversely proportional to the shear rate. Investigations also confirmed that floc size depends on the geometry gap, and it affects the measured shear stress. Furthermore, suspension photographs revealed an increasing tendency to aggregation and wall depletion with sodium chloride concentration of 10 -3 M and higher.

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Section: Introductionmentioning

confidence: 99%

Flocculated flow of microfibrillated cellulose water suspensions: an imaging approach for characterisation of rheological behaviour

et al. 2012

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“…7,9 Cellulose nanofibers produced by grinding are fundamentally different from cellulose nanowhiskers as used by Qi et al 9 in terms of their entanglement, morphology, production process and yield. 13,14 In particular, the difference in entanglement can be attributed to the difference between the aspect ratios of cellulose nanowhiskers and of cellulose nanofibers produced by grinding. Grinding is simpler, cheaper and faster than acid hydrolysis, bacterial synthesis or electrospinning, and it is a one-step high-yield process.…”

Section: Introductionmentioning

confidence: 99%

“…Grinding is simpler, cheaper and faster than acid hydrolysis, bacterial synthesis or electrospinning, and it is a one-step high-yield process. 13,14 For instance, we produced all of the nanofibers for this study (100 g) from bleached cellulose microfibers after just 4 h in the laboratory. In contrast, the production of cellulose nanowhiskers is costly and time consuming, and involves processes such as acid hydrolysis, centrifuging and dialysis.…”

Section: Introductionmentioning

confidence: 99%

All-cellulose composite and nanocomposite made from partially dissolved micro- and nanofibers of canola straw

Yousefi

Faezipour

Nishino

et al. 2011

Polym J

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All-cellulose composite (ACC) and nanocomposite (ACNC) were, respectively, made from microfiber and grinding-based nanofiber of canola straw by using a partial dissolution method with the solvent N,N-dimethylacetamide/lithium chloride (DMAc/LiCl). The dissolution times were 5, 10, 20, 30, 60 and 120 mins. The resultant composites were compared with neat micro-and nanofiber sheets. The average diameter of microfiber was 26 lm, which was downsized to 32 nm after grinding. The grinding process is a simple, cheap and fast downsizing method that could reduce fiber diameter by almost three orders of magnitude. The tensile strength of the nanofiber sheet was 11 times higher than that of the microfiber sheet. As dissolution time increased, the amount of non-crystalline matrix in the ACC and ACNC increased, and the apparent crystallinity decreased. The ACC had a tensile strength of 59 MPa when the dissolution time was 120 min, whereas the ACNC approached a maximum tensile strength of 164 MPa after a short dissolution time (10 min). Fiber pull-out was observed in the tensile-broken surfaces of the micro-and nanofiber sheets, and fibers tended to break when the dissolution time was long.

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“…23,25,26 There have been many research reports of the treatment of alkali on cellulose fibers and applications of these in polymer composites. 2,[10][11][12][13][14][15][16][17][27][28][29][30][31][32][33][34][35] For chemical treatment of cellulose, the focus has been mainly on changes of characteristics of cellulose surface by removing impurities on the cellulose fiber, which results in more hydroxyl groups (active sites) exposure on the cellulose fiber. [10][11][12][13][14][15][16][17] There have been no published reports uses of nano-cellulose filled polymer composite for characterization because the nano-cellulose fibers has been typically obtained in lab scale thus the yield was so small not enough to put into polymer matrix.…”

Section: 폴리머 제39권 제1호 2015년mentioning

confidence: 99%

Effects of Alkali Treated Nano-kenaf Fiber in Polypropylene Composite upon Mechanical Property Changes

Oh¹,

Lee²,

Kim³

2015

Polymer Korea

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The surface of nano-kenaf containing cellulose fibers was treated with alkali (NaOH) and their effects on the physical properties of the polypropylene (PP) composite were investigated. The treatment of alkali on the fibers increased the melt flow index (M.I.), elongation%, and impact strength, while it decreased the tensile strength, flexural modulus and heat deflection temperature (HDT) of the compound compared to the untreated one. It seemed the alkali treatment on the nano-kenaf fiber changed the character of the fiber due to removal of impurities and chemicals on the surface and resulted in decreased interfacial adhesion between the nano-fiber surface and the PP matrix and changed the character of the PP.

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Obtaining Cellulose Nanofibers with a Uniform Width of 15 nm from Wood

Cited by 833 publications

References 25 publications

Flocculated flow of microfibrillated cellulose water suspensions: an imaging approach for characterisation of rheological behaviour

Flocculated flow of microfibrillated cellulose water suspensions: an imaging approach for characterisation of rheological behaviour

All-cellulose composite and nanocomposite made from partially dissolved micro- and nanofibers of canola straw

Effects of Alkali Treated Nano-kenaf Fiber in Polypropylene Composite upon Mechanical Property Changes

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