Micro nanofibrillated cellulose (MNFC) gel dewatering induced at ultralow-shear in presence of added colloidally-unstable particles

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Micro nanofibrillated cellulose (MNFC) gel dewatering induced at ultralow-shear in presence of added colloidally-unstable particles. / Dimic-Misic, Katarina; Maloney, Thaddeus; Liu, Guodong; Gane, Patrick.

In: Cellulose, Vol. 24, No. 3, 2017, p. 1463-1481.

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@article{12839e2c701c4ec1b87b5397cc90d07c,
title = "Micro nanofibrillated cellulose (MNFC) gel dewatering induced at ultralow-shear in presence of added colloidally-unstable particles",
abstract = "Aqueous nanogels are notoriously difficult to dewater. An example of such a gel is that of a suspension of micro nanofibrillated cellulose, in which water is both bound to the fibrillar surface and held within the interfibril matrix. We demonstrate a phenomenon in which dewatering of nanocellulose based gel-like suspensions can be induced by adding a colloidal particulate component, which itself can undergo autoflocculation when suspended in water. The mechanism is exemplified by the addition of undispersed precipitated calcium carbonate, which in equilibrium remains stabilised in the gel, but when the gel mix is exposed to ultralow shear, acting below the yield stress, demixing of the combination between the nanofibrils and the autoflocculating pigment leads to separation of the unbound water phase. This novel mechanism is proposed to enhance the dewatering capability in general of complex gel-like water-holding suspensions.",
keywords = "Autoflocculation, De-mixing of solids in gel, Micro nanofibrillated cellulose, Phase separation in gels, Ultralow shear dewatering",
author = "Katarina Dimic-Misic and Thaddeus Maloney and Guodong Liu and Patrick Gane",
year = "2017",
doi = "10.1007/s10570-016-1181-x",
language = "English",
volume = "24",
pages = "1463--1481",
journal = "Cellulose",
issn = "0969-0239",
number = "3",

}

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TY - JOUR

T1 - Micro nanofibrillated cellulose (MNFC) gel dewatering induced at ultralow-shear in presence of added colloidally-unstable particles

AU - Dimic-Misic, Katarina

AU - Maloney, Thaddeus

AU - Liu, Guodong

AU - Gane, Patrick

PY - 2017

Y1 - 2017

N2 - Aqueous nanogels are notoriously difficult to dewater. An example of such a gel is that of a suspension of micro nanofibrillated cellulose, in which water is both bound to the fibrillar surface and held within the interfibril matrix. We demonstrate a phenomenon in which dewatering of nanocellulose based gel-like suspensions can be induced by adding a colloidal particulate component, which itself can undergo autoflocculation when suspended in water. The mechanism is exemplified by the addition of undispersed precipitated calcium carbonate, which in equilibrium remains stabilised in the gel, but when the gel mix is exposed to ultralow shear, acting below the yield stress, demixing of the combination between the nanofibrils and the autoflocculating pigment leads to separation of the unbound water phase. This novel mechanism is proposed to enhance the dewatering capability in general of complex gel-like water-holding suspensions.

AB - Aqueous nanogels are notoriously difficult to dewater. An example of such a gel is that of a suspension of micro nanofibrillated cellulose, in which water is both bound to the fibrillar surface and held within the interfibril matrix. We demonstrate a phenomenon in which dewatering of nanocellulose based gel-like suspensions can be induced by adding a colloidal particulate component, which itself can undergo autoflocculation when suspended in water. The mechanism is exemplified by the addition of undispersed precipitated calcium carbonate, which in equilibrium remains stabilised in the gel, but when the gel mix is exposed to ultralow shear, acting below the yield stress, demixing of the combination between the nanofibrils and the autoflocculating pigment leads to separation of the unbound water phase. This novel mechanism is proposed to enhance the dewatering capability in general of complex gel-like water-holding suspensions.

KW - Autoflocculation

KW - De-mixing of solids in gel

KW - Micro nanofibrillated cellulose

KW - Phase separation in gels

KW - Ultralow shear dewatering

UR - http://www.scopus.com/inward/record.url?scp=85008628520&partnerID=8YFLogxK

U2 - 10.1007/s10570-016-1181-x

DO - 10.1007/s10570-016-1181-x

M3 - Article

VL - 24

SP - 1463

EP - 1481

JO - Cellulose

JF - Cellulose

SN - 0969-0239

IS - 3

ER -

ID: 10573338