Effect of Electric Double Layer on Viscoelastic Behavior of Highly Concentrated Suspension.

Horigome, Misao; Yada, Makoto

doi:10.1678/rheology.28.113

Cited by 4 publications

(12 citation statements)

References 9 publications

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“…The spherical MS particles were synthesized via emulsion polymerization and fully characterized previously: 1,2) The bare particle radius was 45 nm and the radius polydispersity factor was less than 0.05. , suggesting that the terminal behavior emerges at sufficiently low ω (<<0.1 s…”

Section: Methodsmentioning

confidence: 99%

“…In the Brady expression, 9) σ T is given by the dyadic of the center-to-center vector r for two particles averaged over a pair-wise distribution function of the particles g(r). 9) The key quantities in these expressions, B 2,1 and g(r), can be evaluated from S(q) if S(q) is known in the entire q space, i.e., in all scattering directions and for all values of q. However, our experiments gave the I(q) data only in a limited range of q in the velocity-vorticity plane, and the desired S(q) cannot be obtained from those data.…”

Section: Thinning Mechanismmentioning

confidence: 99%

“…To confirm a reliability of this G ∞ value, we utilized the G ∞ data 2) for the MS/H 2 O suspension (φ = 0.448) having the viscosity close to that of our MS/D 2 O suspension (cf. Fig.1b).…”

Section: Estimation Of Thermodynamic Stressmentioning

confidence: 99%

“…A requirement of protecting natural environment encourages the use of water as the suspending medium. Considering this requirement, we recently focused on rheological properties of aqueous suspensions of poly(methyl methacrylate-co-styrene) (MS) particles, [1][2][3] the model material for aqueous inks.…”

Section: Introdctionmentioning

confidence: 99%

“…1,2) The zero-shear viscosity η 0 of the suspensions was governed by an effective volume fraction φ eff (>φ) that included the volume of the electrostatic shell. In fact, the φ eff dependence of η 0 of the MS particles was in close agreement with the φ dependence seen for hard-core silica particles, 4) the latter being subjected to (almost) fully screened electrostatic interaction to have a negligibly thin electrostatic shell.…”

Section: Introdctionmentioning

confidence: 99%

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Rheo-SANS Study of an Aqueous Suspension of Poly(Methyl Methacrylate-co-Styrene) Particle

Watanabe

Kanaya

Takahashi

et al. 2002

J. Soc. Rheol., Jpn

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For an aqueous suspension of poly (methyl methacrylate-co-styrene) (MS) particles, viscosity η and small-angle neutron scattering (SANS) intensity I(q) were measured under steady shear. The MS particles had partially screened surface charges. In the quiescent state, the particle distribution detected through the I(q) profile was isotropic and essentially liquid-like but also exhibited a weak, local order. Under steady shear, this distribution was distorted just moderately, and the η strongly decreased with increasing shear rate γ• . Thus, this thinning of η was related to the weak distortion of the particle distribution. Furthermore, the thermodynamic stress σ T estimated from the I(q) profile under the shear increased only weakly with increasing γ• , and the corresponding viscosity η T (=σ T /γ • ) was close to the η data. These results strongly suggested that the thinning of the MS suspension reflected the nonlinearity of σ T . The zero-shear viscosity η 0 of the suspensions was governed by an effective volume fraction φ eff (>φ) that included the volume of the electrostatic shell. In fact, the φ eff dependence of η 0 of the MS particles was in close agreement with the φ dependence seen for hard-core silica particles, 4) the latter being subjected to (almost) fully screened electrostatic interaction to have a negligibly thin electrostatic shell. This result suggested that the terminal relaxation of the MS suspensions corresponds to the relaxation of the thermodynamic stress, as similar to the situation in the hard-core suspensions: KeyThe thermodynamic stress reflects a strain/flow-induced distortion in the spatial distribution of the particles and relaxes through the Brownian motion of the particles. [8][9][10][11][12]

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Section: Methodsmentioning

confidence: 99%

Section: Thinning Mechanismmentioning

confidence: 99%

Section: Estimation Of Thermodynamic Stressmentioning

confidence: 99%

Section: Introdctionmentioning

confidence: 99%

Section: Introdctionmentioning

confidence: 99%

See 3 more Smart Citations

Rheo-SANS Study of an Aqueous Suspension of Poly(Methyl Methacrylate-co-Styrene) Particle

Watanabe

Kanaya

Takahashi

et al. 2002

J. Soc. Rheol., Jpn

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Rheology of poly(methyl methacrylate- co -styrene) particles suspended in water: effects of electrostatic surface layer

Horigome¹,

Yada²,

Watanabe

2002

Rheologica Acta

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Rheological Properties and Interparticle Force in Aqueous Suspensions of Resin Particles with/without Associating Polymers.

堀米

2001

J. Soc. Rheol., Jpn

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Rheological properties of aqueous suspensions and rheometry for viscoelastic measurements over a wide range of frequency were investigated. The raised cosine pulse method for the measurements was improved by using rectangular pulse strain including high-frequency Fourier components. For further extension of the frequency range, a new rheometer was also developed on the basis of the surface loading method. These methods as well as a conventional dynamic method were utilized to determine rheological properties of aqueous solutions of an end-associating polymer (suspending media for resin particles). The relaxation behavior of these solutions was in good agreement with predictions of the Tanaka theory for transient networks. Aqueous suspensions of poly(acryl-co-styrene)(AS) particles with radius a 0 =45nm showed linear viscoelastic relaxation behavior, and the time-volume fraction superposition was found to be valid. In the linear regime, AS particles behaved as the Brownian hard particles having an effective radius a eff = a 0 + ξ with ξ being a thickness of the electric double layer, and the dependence of their zero-shear viscosity η 0 on an effective volume fraction φ eff (= {a eff /a 0 } 3 φ ) agreed with the dependence of η 0 of ideal silica suspensions on the bare volume fraction φ . In the range of φ eff < φ m ( φ m ; random close packing volume fraction), η 0 was well described by the Brady theory for Brownian particles. In the range of φ eff > 0.6, a repulsive force due to overlapping electric double layers also contributed to the viscoelastic behavior of AS suspensions. In aqueous suspensions of polystyrene (PS) particles, flocculation and sedimentation of PS particles occurred on addition of a small amount of the associating polymer. Analysis of the polymer conformation at the particle surface suggested that the polymers formed interparticle bridges thereby inducing of the flocculation and sedimentation.

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Effect of Electric Double Layer on Viscoelastic Behavior of Highly Concentrated Suspension.

Cited by 4 publications

References 9 publications

Rheo-SANS Study of an Aqueous Suspension of Poly(Methyl Methacrylate-co-Styrene) Particle

Rheo-SANS Study of an Aqueous Suspension of Poly(Methyl Methacrylate-co-Styrene) Particle

Rheology of poly(methyl methacrylate- co -styrene) particles suspended in water: effects of electrostatic surface layer

Rheological Properties and Interparticle Force in Aqueous Suspensions of Resin Particles with/without Associating Polymers.

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