Effect of Poly(ethylene glycol) Concentration on the Re-entrant Gelation and Yielding Behavior of Aqueous Hectorite Clay Dispersion†

doi:10.7503/cjcu20140448

Abstract

Abstract:

The Na⁺ concentration released from hectorite clay was evaluated from the conductivity and pH. The results indicated that the soft solid formed by 30 mg/mL aqueous hectorite clay dispersion after aging without dialysis or ion exchange was reaction-limited cluster aggregation(RLCA) colloidal gel. The effect of polyethylene glycol(PEG) concentration c_p on the linear and nonlinear viscoelasticity of the hectorite clay/PEG dispersions was investigated by rheology. Small amplitude oscillatory shear(SAOS) frequency sweep indicated that the hectorite clay/PEG gel dispersion experienced a “RLCA colloidal gel-viscoelastic liquid-depletion colloidal gel” transition with increasing c_p. The re-entrant gelation was firstly observed in this dispersion. Shear viscosity and dynamic moduli under large amplitude oscillatory shear revealed that the PEG concentration affected similarly on the yielding behavior of the hectorite/PEG dispersion.

Key words: Laponite, Polyethylene glycol, Re-entrant gelation, Yielding behavior, Small amplitude oscillatory shear, Reaction-limited cluster aggregation

TrendMD:

SHU Ruiwen, SUN Weixiang, LIU Xinxing, TONG Zhen. Effect of Poly(ethylene glycol) Concentration on the Re-entrant Gelation and Yielding Behavior of Aqueous Hectorite Clay Dispersion^†[J]. Chem. J. Chinese Universities, 2014, 35(10): 2252.

Figures/Tables 6

Fig.1 Dynamic storage modulus G'(filled symbols) and loss modulus G″(open symbols) as a function of ω for hectorite clay/PEG samples with cw=30 mg/mL and cp=0—10 mg/mL at γ0=0.5%

Fig.2 Storage modulus G' plotted against PEG concentration cp at γ0=0.5% of hectorite clay/PEG samples L30Pcp ω/(rad·s-1): a. 0.1; b. 1; c. 10.

Fig.3 Steady shear viscosity curves of hectorite clay/PEG samples L30Pcp with indicated σp

Fig.4 Shear stress of hectorite clay/PEG samples L30Pcp with indicated cp at 25 ℃

Fig.5 Strain amplitude γ0 dependence of the storage modulus G'(filled symbols) and loss modulus G″(open symbols) of hectorite clay/PEG samples L30Pcp with indicated cp at ω=6.28 rad/s Inset: cp dependence of the strain amplitude threshold γ0,c.

Fig.6 Strain amplitude γ0 dependence of the normalized loss modulus G″ of hectorite clay/PEG samples L30Pcp with indicated cp at ω=6.28 rad/s

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