Abstract
Cellulose is an abundant green polymer, which can be obtained in a variety of nanoscale structures broadly grouped as nano/microfibrils (CNF/MFC), bacterial celluloses (BC) or nano/microcrystals (CNC/CMC). There is increasing interest of nanocelluloses by the research and industrial communities due to increasing available materials (facilities than can produce ton per day), impressive strength properties, low density, renewability and biodegradability. However, one problem is the lack of knowledge on the nanomechanical properties of cellulose nanofibrils, which creates barriers for the scientists and producers to optimize and predict behavior of the final product.
In this research, the behavior of thin filmed (t≤100 μm) cellulose nanofibrils’, located on aluminum pin stubs, under nano compression loads were investigated using an Asylum Research MFP-3D Atomic Force Microscope equipped with a nanoindenter. Unloading curves were analyzed using Oliver-Pharr. As a result of 58 successful nanoindents, the average modulus value was estimated as 16.6 GPa with the reduced modulus value of 18.2 GPa. The CNF Modulus values varied between 12.4 GPa – 22.8 GPa with 16.9% coefficient of variation (COV) while the reduced modulus ranged from 13.7 GPa to 24.9 GPa with a 16.2 % COV.
This research provides practical knowledge for producers of nanocellulose, researchers and applications developers who focus on nanocellulose reinforced composite materials.
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R. J. Moon; A. Martini, J. Nairn, J. Simonsen and J. Youngblood (2010), Cellulose nanomaterials review: structure, properties and nanocomposites. Chem. Soc. Rev. 40, 3941–3944.
S. J. Eichhorn, A. Dufresne ,M. Aranguren, N. E. Marcovich, J. R. Capadona,S. J. Rowan, C. Weder,W. Thielemans, M. Roman, S. Renneckar, W. Gindl, S. Veigel Æ J. Keckes , H. Yano, K. Abe, M. Nog,A. N. Nakagaito , A. Mangalam, J. Simonsen, A. S. Benight, A. Bismarck, L. A. Berglund, T. Peijs (2010), Review: current international research into cellulose nanofibres and nanocomposites. Journal of Material Science 45 (1) 1–33.
S. Kalia, A. Dufresne, B. M. Cherian, B. S. Kaith, L. Averous, and J. Njuguna (2011), Cellulose-Based Bio and Nanocomposites: A Review. International Journal of Polymer Science (2011) 1–35.
Q. Cheng, S. Wang and D. P. Harper (2009), Effects of process and source on elastic modulus of single cellulose fibrils evaluated by atomic force microscopy. Composites: Part A 583–588.
W. Gindl, J. Konnerth and T. Schoberi (2006), Nanoindentation of regenerated cellulose fibers. Cellulose (13) 1–7.
G. Josefsson, F. Berthold and E. K. Gamstest (2014), Stiffness contribution of cellulose nanofibrils to composite materials. International Journal of Solids and Structures 51, 945–953.
G. Bining and C. F. Quate (1986), Atomic Force Microscope. Physical Review Letters (56-9) 920–934.
H. J. Butt, B. Cappella and M. Kappl (2005), Force measurements with the atomic force microscope: Technique, interpretation and applications. Surface Science Reports (59) 1–152.
B. J. Briscoe, L. Fiori and E. Pelillo (1988), Nano-ondentation of Polymeric surfaces. J. Phys. D: Appl. Phys. (31) 2395–2405.
W. C. Oliver and G. M. Pharr (1992), An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments. J. Mater. Res. (7–6), 1564–1583.
K. Nakamura, M. Wada, S. Kuga and T. Okano (2004), Poisson’s Ratio of Cellulose Iβ and Cellulose II. Journal of Polymer Science Part B: Polymer Physics 42 (7), 1206–1211.
A. Pakzad, J. Simonsen and R. S. Yassar (2012), Gradient of nanomechanical properties in the interphase of cellulose nanocrystal composites. Composites Science and Technology (72), 314–319.
P. Krishnamachari, R. Hashaikeh, M. Chiesa and K. R. M. Gad El Rab (2012), Effects of Acid Hydrolysis Time on Cellulose Nanocrystals Properties: Nanoindentation and Thermogravimetrics Studies. Cellulose Chemistry and Technology 46 (1–2), 13–18.
X. Wu, Robert J. Moon and A. Martini (2013), Crystalline cellulose elastic modulus predicted by atomistic models of uniform deformation and nanoscale indentation. Cellulose (20), 43–55.
X. Wu, Robert J. Moon and A. Martini (2014), Tensile strength of Iβ crystalline cellulose predicted by molecular dynamics simulation. Cellulose 21: 2233–2245.
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Yildirim, N., Shaler, S. Nanomechanical properties of cellulose nanofibrils (CNF). MRS Advances 1, 639–644 (2016). https://doi.org/10.1557/adv.2015.30
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DOI: https://doi.org/10.1557/adv.2015.30