title: Cellulose micro/nanofibres from Eucalyptus kraft pulp: preparation and properties.
abstract: There is growing interest in cellulose nanofibres from renewable sources for several industrial applications. However, there is a lack of information about one of the most abundant cellulose pulps: bleached Eucalyptus kraft pulp. The objective of the present work was to obtain Eucalyptus cellulose micro/nanofibres by three different processes, namely: refining, sonication and acid hydrolysis of the cellulose pulp. The refining was limited by the low efficiency of isolated nanofibrils, while sonication was more effective for this purpose. However, the latter process occurred at the expense of considerable damage to the cellulose structure. The whiskers obtained by acid hydrolysis resulted in nanostructures with lower diameter and length, and high crystallinity. Increasing hydrolysis reaction time led to narrower and shorter whiskers, but increased the crystallinity index. The present work contributes to the different widespread methods used for the production of micro/nanofibres for different applications.
authors.affiliation: Department of Forest Science, Universidade Federal de Lavras, C.P. 3037, 37200-000 Lavras, MG, Brazil.
authors.forename: G H D
authors.initials: GH
authors.lastname: Tonoli
authors.affiliation: Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA), Embrapa Instrumentação (CNPDIA), Caixa Postal 741, São Carlos, SP, CEP 13560-970, Brazil.
authors.forename: E M
authors.initials: EM
authors.lastname: Teixeira
authors.affiliation: Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA), Embrapa Instrumentação (CNPDIA), Caixa Postal 741, São Carlos, SP, CEP 13560-970, Brazil.
authors.forename: A C
authors.initials: AC
authors.lastname: Corrêa
authors.affiliation: Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA), Embrapa Instrumentação (CNPDIA), Caixa Postal 741, São Carlos, SP, CEP 13560-970, Brazil.
authors.forename: J M
authors.initials: JM
authors.lastname: Marconcini
authors.affiliation: Department of Forest Science, Universidade Federal de Lavras, C.P. 3037, 37200-000 Lavras, MG, Brazil.
authors.forename: L A
authors.initials: LA
authors.lastname: Caixeta
authors.affiliation: Instituto de Física de São Carlos, Universidade de São Paulo, C.P. 369, 13560-970 São Carlos, SP, Brazil; Centro Universitário Central Paulista - UNICEP, Brazil.
authors.forename: M A
authors.initials: MA
authors.lastname: Pereira-da-Silva
authors.affiliation: Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA), Embrapa Instrumentação (CNPDIA), Caixa Postal 741, São Carlos, SP, CEP 13560-970, Brazil.
authors.forename: L H C
authors.initials: LH
authors.lastname: Mattoso
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D003460:Crystallization; D005052:Eucalyptus; D006868:Hydrolysis; D008853:Microscopy / Q000379:methods; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D028321:Plant Preparations / Q000737:chemistry; D013010:Sonication; D013464:Sulfuric Acids / Q000737:chemistry; D013818:Thermogravimetry
chemical_list: D028321:Plant Preparations; D013464:Sulfuric Acids; D002482:Cellulose; C033158:sulfuric acid