Viscoelastic properties of nanocelluloses in liquid and dried states: Comparison of core-shell vs. surface-charged structures

Reina Tanaka, Tsuguyuki Saito, Tuomas Hänninen, Yuko Ono, Minna Hakalahti, Tekla Tammelin, Akira Isogai

Research output: Contribution to conferenceConference AbstractScientificpeer-review

Abstract

The influence of the electrostatic or steric stabilization of nanocelluloses in water on their viscoelastic properties as dispersions and assembled films was investigated. Sterically stabilized nanocelluloses were extracted from Japanese persimmons via acid treatment, purification, and bleaching. The obtained nanocelluloses were composed of cellulose, hemicelluloses and pectin. Hemicelluloses and pectin were organized as steric layers on the cellulose nanofibril surfaces, forming core-shell structured nanocelluloses with carboxylate content of 0.2 mmol/g. Electrostatically stabilized nanocelluloses, namely surface-charged nanocelluloses, with higher carboxylate content of 0.9 mmol/g were prepared from softwood bleached kraft pulp by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation. Both the core-shell structured and surface-charged nanocelluloses were prepared as dispersions at the individual nanofibrils level in water. Viscoelastic properties of the obtained dispersions and their assembled films prepared by spin-coating method were estimated using a rheometer and a quartz crystal microbalance with dissipation (QCM-D) instrument, respectively. The influence of the pH and salt concentration on these properties were assessed. When the pH and salt concentration of the nanocellulose dispersions were changed, the core-shell structured nanocellulose dispersions showed smaller variation in viscoelastic properties than the surface-charged ones. The core-shell structured nanocellulose dispersions were more stable against changes of the pH and salt concentration in terms of their viscoelastic properties. The previous statement was then confirmed by the QCM-D measurement of the assembled films; the core-shell structured nanocelluloses showed lower storage and loss moduli.
Original languageEnglish
Publication statusPublished - Mar 2016
MoE publication typeNot Eligible
Event251st ACS National meeting and Exposition - San Diego, United States
Duration: 13 Mar 201617 Mar 2016

Conference

Conference251st ACS National meeting and Exposition
CountryUnited States
CitySan Diego
Period13/03/1617/03/16

Fingerprint

liquids
salt concentration
films (materials)
nanofibers
quartz
hemicellulose
pectins
crystals
cellulose
bleached kraft pulp
loss modulus
persimmons
storage modulus
softwood
acid treatment
bleaching
coatings
water
oxidation
methodology

Cite this

Tanaka, R., Saito, T., Hänninen, T., Ono, Y., Hakalahti, M., Tammelin, T., & Isogai, A. (2016). Viscoelastic properties of nanocelluloses in liquid and dried states: Comparison of core-shell vs. surface-charged structures. Abstract from 251st ACS National meeting and Exposition, San Diego, United States.
Tanaka, Reina ; Saito, Tsuguyuki ; Hänninen, Tuomas ; Ono, Yuko ; Hakalahti, Minna ; Tammelin, Tekla ; Isogai, Akira. / Viscoelastic properties of nanocelluloses in liquid and dried states: Comparison of core-shell vs. surface-charged structures. Abstract from 251st ACS National meeting and Exposition, San Diego, United States.
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abstract = "The influence of the electrostatic or steric stabilization of nanocelluloses in water on their viscoelastic properties as dispersions and assembled films was investigated. Sterically stabilized nanocelluloses were extracted from Japanese persimmons via acid treatment, purification, and bleaching. The obtained nanocelluloses were composed of cellulose, hemicelluloses and pectin. Hemicelluloses and pectin were organized as steric layers on the cellulose nanofibril surfaces, forming core-shell structured nanocelluloses with carboxylate content of 0.2 mmol/g. Electrostatically stabilized nanocelluloses, namely surface-charged nanocelluloses, with higher carboxylate content of 0.9 mmol/g were prepared from softwood bleached kraft pulp by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation. Both the core-shell structured and surface-charged nanocelluloses were prepared as dispersions at the individual nanofibrils level in water. Viscoelastic properties of the obtained dispersions and their assembled films prepared by spin-coating method were estimated using a rheometer and a quartz crystal microbalance with dissipation (QCM-D) instrument, respectively. The influence of the pH and salt concentration on these properties were assessed. When the pH and salt concentration of the nanocellulose dispersions were changed, the core-shell structured nanocellulose dispersions showed smaller variation in viscoelastic properties than the surface-charged ones. The core-shell structured nanocellulose dispersions were more stable against changes of the pH and salt concentration in terms of their viscoelastic properties. The previous statement was then confirmed by the QCM-D measurement of the assembled films; the core-shell structured nanocelluloses showed lower storage and loss moduli.",
author = "Reina Tanaka and Tsuguyuki Saito and Tuomas H{\"a}nninen and Yuko Ono and Minna Hakalahti and Tekla Tammelin and Akira Isogai",
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Tanaka, R, Saito, T, Hänninen, T, Ono, Y, Hakalahti, M, Tammelin, T & Isogai, A 2016, 'Viscoelastic properties of nanocelluloses in liquid and dried states: Comparison of core-shell vs. surface-charged structures' 251st ACS National meeting and Exposition, San Diego, United States, 13/03/16 - 17/03/16, .

Viscoelastic properties of nanocelluloses in liquid and dried states: Comparison of core-shell vs. surface-charged structures. / Tanaka, Reina; Saito, Tsuguyuki; Hänninen, Tuomas; Ono, Yuko; Hakalahti, Minna; Tammelin, Tekla; Isogai, Akira.

2016. Abstract from 251st ACS National meeting and Exposition, San Diego, United States.

Research output: Contribution to conferenceConference AbstractScientificpeer-review

TY - CONF

T1 - Viscoelastic properties of nanocelluloses in liquid and dried states: Comparison of core-shell vs. surface-charged structures

AU - Tanaka, Reina

AU - Saito, Tsuguyuki

AU - Hänninen, Tuomas

AU - Ono, Yuko

AU - Hakalahti, Minna

AU - Tammelin, Tekla

AU - Isogai, Akira

PY - 2016/3

Y1 - 2016/3

N2 - The influence of the electrostatic or steric stabilization of nanocelluloses in water on their viscoelastic properties as dispersions and assembled films was investigated. Sterically stabilized nanocelluloses were extracted from Japanese persimmons via acid treatment, purification, and bleaching. The obtained nanocelluloses were composed of cellulose, hemicelluloses and pectin. Hemicelluloses and pectin were organized as steric layers on the cellulose nanofibril surfaces, forming core-shell structured nanocelluloses with carboxylate content of 0.2 mmol/g. Electrostatically stabilized nanocelluloses, namely surface-charged nanocelluloses, with higher carboxylate content of 0.9 mmol/g were prepared from softwood bleached kraft pulp by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation. Both the core-shell structured and surface-charged nanocelluloses were prepared as dispersions at the individual nanofibrils level in water. Viscoelastic properties of the obtained dispersions and their assembled films prepared by spin-coating method were estimated using a rheometer and a quartz crystal microbalance with dissipation (QCM-D) instrument, respectively. The influence of the pH and salt concentration on these properties were assessed. When the pH and salt concentration of the nanocellulose dispersions were changed, the core-shell structured nanocellulose dispersions showed smaller variation in viscoelastic properties than the surface-charged ones. The core-shell structured nanocellulose dispersions were more stable against changes of the pH and salt concentration in terms of their viscoelastic properties. The previous statement was then confirmed by the QCM-D measurement of the assembled films; the core-shell structured nanocelluloses showed lower storage and loss moduli.

AB - The influence of the electrostatic or steric stabilization of nanocelluloses in water on their viscoelastic properties as dispersions and assembled films was investigated. Sterically stabilized nanocelluloses were extracted from Japanese persimmons via acid treatment, purification, and bleaching. The obtained nanocelluloses were composed of cellulose, hemicelluloses and pectin. Hemicelluloses and pectin were organized as steric layers on the cellulose nanofibril surfaces, forming core-shell structured nanocelluloses with carboxylate content of 0.2 mmol/g. Electrostatically stabilized nanocelluloses, namely surface-charged nanocelluloses, with higher carboxylate content of 0.9 mmol/g were prepared from softwood bleached kraft pulp by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation. Both the core-shell structured and surface-charged nanocelluloses were prepared as dispersions at the individual nanofibrils level in water. Viscoelastic properties of the obtained dispersions and their assembled films prepared by spin-coating method were estimated using a rheometer and a quartz crystal microbalance with dissipation (QCM-D) instrument, respectively. The influence of the pH and salt concentration on these properties were assessed. When the pH and salt concentration of the nanocellulose dispersions were changed, the core-shell structured nanocellulose dispersions showed smaller variation in viscoelastic properties than the surface-charged ones. The core-shell structured nanocellulose dispersions were more stable against changes of the pH and salt concentration in terms of their viscoelastic properties. The previous statement was then confirmed by the QCM-D measurement of the assembled films; the core-shell structured nanocelluloses showed lower storage and loss moduli.

M3 - Conference Abstract

ER -

Tanaka R, Saito T, Hänninen T, Ono Y, Hakalahti M, Tammelin T et al. Viscoelastic properties of nanocelluloses in liquid and dried states: Comparison of core-shell vs. surface-charged structures. 2016. Abstract from 251st ACS National meeting and Exposition, San Diego, United States.