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The effect of consistency on the shear rheology of aqueous suspensions of cellulose micro- and nanofibrils: a review
While the raw material type and the production method of cellulose micro- and nanofibrils (CMNFs) strongly affect the absolute values of the rheological parameters of their aqueous suspensions, the dependence of these parameters on consistency, c , is found to be uniform. The consistency index and y...
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| Published in: | Cellulose (London) 2020-03, Vol.27 (4), p.1879-1897 |
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| Language: | English |
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| cites | cdi_FETCH-LOGICAL-c400t-feffb5e457600bced18b06fb165be11d8ce973949d1b4d1689ef7d9bccae6dbc3 |
| container_end_page | 1897 |
| container_issue | 4 |
| container_start_page | 1879 |
| container_title | Cellulose (London) |
| container_volume | 27 |
| creator | Koponen, Antti I. |
| description | While the raw material type and the production method of cellulose micro- and nanofibrils (CMNFs) strongly affect the absolute values of the rheological parameters of their aqueous suspensions, the dependence of these parameters on consistency,
c
, is found to be uniform. The consistency index and yield stress of CMNF suspensions follow generally the scaling laws
K
∼
c
2.43
and
τ
y
∼
c
2.26
, respectively, and a decent approximation for flow index is
n
=
0.30
×
c
-
0.43
. The variability of reported scaling exponents of these materials is likely mainly due to experimental uncertainties and not so much due to fundamentally different rheology. It is suggested that the reason behind the apparently universal rheological behavior of CMNF suspensions is the strong entanglement of fibrils; the flow dynamics of typical CMNF suspensions is dominated by interactions between fibril flocs and not by interactions between individual fibrils.
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| doi_str_mv | 10.1007/s10570-019-02908-w |
| format | article |
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c
, is found to be uniform. The consistency index and yield stress of CMNF suspensions follow generally the scaling laws
K
∼
c
2.43
and
τ
y
∼
c
2.26
, respectively, and a decent approximation for flow index is
n
=
0.30
×
c
-
0.43
. The variability of reported scaling exponents of these materials is likely mainly due to experimental uncertainties and not so much due to fundamentally different rheology. It is suggested that the reason behind the apparently universal rheological behavior of CMNF suspensions is the strong entanglement of fibrils; the flow dynamics of typical CMNF suspensions is dominated by interactions between fibril flocs and not by interactions between individual fibrils.
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c
, is found to be uniform. The consistency index and yield stress of CMNF suspensions follow generally the scaling laws
K
∼
c
2.43
and
τ
y
∼
c
2.26
, respectively, and a decent approximation for flow index is
n
=
0.30
×
c
-
0.43
. The variability of reported scaling exponents of these materials is likely mainly due to experimental uncertainties and not so much due to fundamentally different rheology. It is suggested that the reason behind the apparently universal rheological behavior of CMNF suspensions is the strong entanglement of fibrils; the flow dynamics of typical CMNF suspensions is dominated by interactions between fibril flocs and not by interactions between individual fibrils.
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c
, is found to be uniform. The consistency index and yield stress of CMNF suspensions follow generally the scaling laws
K
∼
c
2.43
and
τ
y
∼
c
2.26
, respectively, and a decent approximation for flow index is
n
=
0.30
×
c
-
0.43
. The variability of reported scaling exponents of these materials is likely mainly due to experimental uncertainties and not so much due to fundamentally different rheology. It is suggested that the reason behind the apparently universal rheological behavior of CMNF suspensions is the strong entanglement of fibrils; the flow dynamics of typical CMNF suspensions is dominated by interactions between fibril flocs and not by interactions between individual fibrils.
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| language | eng |
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| source | Springer Nature |
| subjects | Bioorganic Chemistry Cellulose Ceramics Chemistry Chemistry and Materials Science Composites Consistency Entanglement Glass Natural Materials Organic Chemistry Parameters Physical Chemistry Polymer Sciences Production methods Review Paper Rheological properties Rheology Scaling laws Sustainable Development Yield stress |
| title | The effect of consistency on the shear rheology of aqueous suspensions of cellulose micro- and nanofibrils: a review |
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