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Preparation and characterization of cellulose nanofibers from two commercial hardwood and softwood pulps / Wolfgang Stelte in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11211–11219 Titre : Preparation and characterization of cellulose nanofibers from two commercial hardwood and softwood pulps Type de document : texte imprimé Auteurs : Wolfgang Stelte, Auteur ; Anand R. Sanadi, Auteur Année de publication : 2010 Article en page(s) : pp. 11211–11219 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Preparation--Characterization--Cellulose--Nanofibers--  Commercial  Hardwood--Softwood--Pulps Résumé : The aim of this work was to study the mechanical fibrillation process for the preparation of cellulose nanofibers from two commercial hard- and softwood cellulose pulps. The process consisted of initial refining and subsequent high-pressure homogenization. The progress in fibrillation was studied using different microscopy techniques, mechanical testing, and fiber density measurements of cellulose films prepared after different processing stages. The mechanical properties of cellulose films showed an increase in strength and stiffness with decreasing fiber size, and this stabilized after a certain number of passes in the homogenizer. Atomic force microscopy studies showed that the obtained cellulose nanofibers had diameters in the 10−25-nm range. The significant difference between the two samples was that the ultimate failure strain for cellulose films made of softwood fibers increased during the process whereas it remained constantly low for hardwood cellulose films. This difference could be due to the presence of shorter fibers and more defects in the films. An important point to note is that excessive processing reduced properties, as seen by the decrease in failure strain of softwood fiber films, and could also decrease other properties such as strength if the number of processing steps were further increased. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9011672 [article] Preparation and characterization of cellulose nanofibers from two commercial hardwood and softwood pulps [texte imprimé] / Wolfgang Stelte, Auteur ; Anand R. Sanadi, Auteur . - 2010 . - pp. 11211–11219. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11211–11219 Mots-clés : Preparation--Characterization--Cellulose--Nanofibers--  Commercial  Hardwood--Softwood--Pulps Résumé : The aim of this work was to study the mechanical fibrillation process for the preparation of cellulose nanofibers from two commercial hard- and softwood cellulose pulps. The process consisted of initial refining and subsequent high-pressure homogenization. The progress in fibrillation was studied using different microscopy techniques, mechanical testing, and fiber density measurements of cellulose films prepared after different processing stages. The mechanical properties of cellulose films showed an increase in strength and stiffness with decreasing fiber size, and this stabilized after a certain number of passes in the homogenizer. Atomic force microscopy studies showed that the obtained cellulose nanofibers had diameters in the 10−25-nm range. The significant difference between the two samples was that the ultimate failure strain for cellulose films made of softwood fibers increased during the process whereas it remained constantly low for hardwood cellulose films. This difference could be due to the presence of shorter fibers and more defects in the films. An important point to note is that excessive processing reduced properties, as seen by the decrease in failure strain of softwood fiber films, and could also decrease other properties such as strength if the number of processing steps were further increased. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9011672

Preparation and characterization of cellulose nanofibers from two commercial hardwood and softwood pulps / Wolfgang Stelte in Industrial & engineering chemistry research, Vol. 48 N° 24 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11211–11219 Titre : Preparation and characterization of cellulose nanofibers from two commercial hardwood and softwood pulps Type de document : texte imprimé Auteurs : Wolfgang Stelte, Auteur ; Anand R. Sanadi, Auteur Année de publication : 2010 Article en page(s) : pp. 11211–11219 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Cellulose  nanofibers  Mechanical  fibrillation  process  Microscopy  techniques Résumé : The aim of this work was to study the mechanical fibrillation process for the preparation of cellulose nanofibers from two commercial hard- and softwood cellulose pulps. The process consisted of initial refining and subsequent high-pressure homogenization. The progress in fibrillation was studied using different microscopy techniques, mechanical testing, and fiber density measurements of cellulose films prepared after different processing stages. The mechanical properties of cellulose films showed an increase in strength and stiffness with decreasing fiber size, and this stabilized after a certain number of passes in the homogenizer. Atomic force microscopy studies showed that the obtained cellulose nanofibers had diameters in the 10−25-nm range. The significant difference between the two samples was that the ultimate failure strain for cellulose films made of softwood fibers increased during the process whereas it remained constantly low for hardwood cellulose films. This difference could be due to the presence of shorter fibers and more defects in the films. An important point to note is that excessive processing reduced properties, as seen by the decrease in failure strain of softwood fiber films, and could also decrease other properties such as strength if the number of processing steps were further increased. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9011672 [article] Preparation and characterization of cellulose nanofibers from two commercial hardwood and softwood pulps [texte imprimé] / Wolfgang Stelte, Auteur ; Anand R. Sanadi, Auteur . - 2010 . - pp. 11211–11219. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 24 (Décembre 2009) . - pp. 11211–11219 Mots-clés : Cellulose  nanofibers  Mechanical  fibrillation  process  Microscopy  techniques Résumé : The aim of this work was to study the mechanical fibrillation process for the preparation of cellulose nanofibers from two commercial hard- and softwood cellulose pulps. The process consisted of initial refining and subsequent high-pressure homogenization. The progress in fibrillation was studied using different microscopy techniques, mechanical testing, and fiber density measurements of cellulose films prepared after different processing stages. The mechanical properties of cellulose films showed an increase in strength and stiffness with decreasing fiber size, and this stabilized after a certain number of passes in the homogenizer. Atomic force microscopy studies showed that the obtained cellulose nanofibers had diameters in the 10−25-nm range. The significant difference between the two samples was that the ultimate failure strain for cellulose films made of softwood fibers increased during the process whereas it remained constantly low for hardwood cellulose films. This difference could be due to the presence of shorter fibers and more defects in the films. An important point to note is that excessive processing reduced properties, as seen by the decrease in failure strain of softwood fiber films, and could also decrease other properties such as strength if the number of processing steps were further increased. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9011672