02271naa a2200313 a 450000100080000000500110000800800410001902200140006002400510007410000190012524501540014426000090029852013150030765000150162265300190163765300300165665300210168665300180170765300170172565300160174265300160175870000140177470000140178870000220180270000190182470000170184370000240186077300730188421651612024-06-26       2023    bl uuuu     u00u1 u    #d  a0283-26317 ahttp://dx.doi.org/10.1515/npprj-2022-00912DOI1 aLIMA, G. G. de  aCryoslash as an effective pre-treatment to obtain nanofibrillated cellulose using ultra-fine friction grinder with kraft pulp.h[electronic resource]  c2023  aApproaches to obtain nanocellulose have been extensively suggested, and among the most competitive methodologies includes mechanical defibrillation, which results in a nanocellulose gel suspension that can be used in a variety of applications. However, standard procedures results ininhomogeneous fibre sizes due to its physical approach. Pretreatments have been suggested, such as enzymes, but their cost is a disadvantage. In this work, we suggest the use of cryoslash for bleach kraft pulp using a simple methodology of embedding the dry kraft pulp in distilled water following by freezing at -80 °C, which was slashed using a common blender and submitted to an ultra-fine friction grinder. Samples were studied at various grinding steps 5, 15, 30, 60 and 120. Overall, the energy difference required to defibrillate with cryoslash was ~3.26 kWh/kg at 30 steps and ~6 at 120 steps, which was similar to enzymatic pre-treatment with nanofibrils significantly smaller. Cryoslash presented a unique C-H in plane structure from nanocellulose, related to a decrease in average size of fibrils, while crystallinity and thermal properties of nanocellulose remained stable at 60 steps, but mechanical properties increased until 120 steps along with the transmittance values related to the energy consumption curve.  aKraft pulp  aDefibrillation  aDesfibrilação mecânica  aMicrofluoridizer  aNanocellulose  aNanocelulose  aPolpa kraft  aTratamentos1 aAGGIO, B.1 aMATOS, M.1 aLIMA, T. A. M. de1 aPEREIRA, B. L.1 aPEDRO, A. C.1 aMAGALHAES, W. L. E.  tNordic Pulp & Paper Research Journalgv. 38, n. 2, p. 333-341, 2023.