Three-phase coexistence in colloidal rod-plate mixtures

Phillip Woolston; Jeroen S. Van Duijneveldt

doi:10.1021/acs.langmuir.5b02224

Three-phase coexistence in colloidal rod-plate mixtures

Phillip Woolston, Jeroen S. Van Duijneveldt^*

^*Corresponding author for this work

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Abstract

Aqueous suspensions of clay particles, such as montmorillonite (MMT) platelets and sepiolite (Sep) rods, tend to form gels at concentrations around 1 vol %. For Sep rods, adsorbing sodium polyacrylate to the surface allows for an isotropic-nematic phase separation to be seen instead. Here, MMT is added to such Sep suspensions, resulting in a complex phase behavior. Across a range of clay concentrations, separation into three phases is observed: a lower, nematic phase dominated by Sep rods, a MMT-rich middle layer, which is weakly birefringent and probably a gel, and a dilute top phase. Analysis of phase volumes suggests that the middle layer may contain as much as 6 vol % MMT. (Figure Presented).

Original language	English
Pages (from-to)	9290-9295
Number of pages	6
Journal	Langmuir
Volume	31
Issue number	34
Early online date	11 Aug 2015
DOIs	https://doi.org/10.1021/acs.langmuir.5b02224
Publication status	Published - 1 Sept 2015

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This is the final published version of the article (version of record). It first appeared online via ACS at https://pubs.acs.org/doi/10.1021/acs.langmuir.5b02224 . Please refer to any applicable terms of use of the publisher.
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@article{159a6738673b4fcf934cff758745dc17,

title = "Three-phase coexistence in colloidal rod-plate mixtures",

abstract = "Aqueous suspensions of clay particles, such as montmorillonite (MMT) platelets and sepiolite (Sep) rods, tend to form gels at concentrations around 1 vol \%. For Sep rods, adsorbing sodium polyacrylate to the surface allows for an isotropic-nematic phase separation to be seen instead. Here, MMT is added to such Sep suspensions, resulting in a complex phase behavior. Across a range of clay concentrations, separation into three phases is observed: a lower, nematic phase dominated by Sep rods, a MMT-rich middle layer, which is weakly birefringent and probably a gel, and a dilute top phase. Analysis of phase volumes suggests that the middle layer may contain as much as 6 vol \% MMT. (Figure Presented).",

author = "Phillip Woolston and \{Van Duijneveldt\}, \{Jeroen S.\}",

year = "2015",

month = sep,

day = "1",

doi = "10.1021/acs.langmuir.5b02224",

language = "English",

volume = "31",

pages = "9290--9295",

journal = "Langmuir",

issn = "0743-7463",

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TY - JOUR

T1 - Three-phase coexistence in colloidal rod-plate mixtures

AU - Woolston, Phillip

AU - Van Duijneveldt, Jeroen S.

PY - 2015/9/1

Y1 - 2015/9/1

N2 - Aqueous suspensions of clay particles, such as montmorillonite (MMT) platelets and sepiolite (Sep) rods, tend to form gels at concentrations around 1 vol %. For Sep rods, adsorbing sodium polyacrylate to the surface allows for an isotropic-nematic phase separation to be seen instead. Here, MMT is added to such Sep suspensions, resulting in a complex phase behavior. Across a range of clay concentrations, separation into three phases is observed: a lower, nematic phase dominated by Sep rods, a MMT-rich middle layer, which is weakly birefringent and probably a gel, and a dilute top phase. Analysis of phase volumes suggests that the middle layer may contain as much as 6 vol % MMT. (Figure Presented).

AB - Aqueous suspensions of clay particles, such as montmorillonite (MMT) platelets and sepiolite (Sep) rods, tend to form gels at concentrations around 1 vol %. For Sep rods, adsorbing sodium polyacrylate to the surface allows for an isotropic-nematic phase separation to be seen instead. Here, MMT is added to such Sep suspensions, resulting in a complex phase behavior. Across a range of clay concentrations, separation into three phases is observed: a lower, nematic phase dominated by Sep rods, a MMT-rich middle layer, which is weakly birefringent and probably a gel, and a dilute top phase. Analysis of phase volumes suggests that the middle layer may contain as much as 6 vol % MMT. (Figure Presented).

UR - https://www.scopus.com/pages/publications/84940780215

U2 - 10.1021/acs.langmuir.5b02224

DO - 10.1021/acs.langmuir.5b02224

M3 - Article (Academic Journal)

C2 - 26262770

AN - SCOPUS:84940780215

SN - 0743-7463

VL - 31

SP - 9290

EP - 9295

JO - Langmuir

JF - Langmuir

IS - 34

ER -

Three-phase coexistence in colloidal rod-plate mixtures

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