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 - http://www.scopus.com/inward/record.url?scp=84940780215&partnerID=8YFLogxK
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 -