Viscoelasticity of Depletion-Induced Gels in Emulsion−Polymer Systems | Zendy

A. MELLER | Zendy; Thomas Gisler | Zendy; David A. Weitz | Zendy; Joel Stavans | Zendy

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Viscoelasticity of Depletion-Induced Gels in Emulsion−Polymer Systems

Author(s) -

A. MELLER,

Thomas Gisler,

David A. Weitz,

Joel Stavans

Publication year - 1999

Publication title -

langmuir

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.042

H-Index - 333

eISSN - 1520-5827

pISSN - 0743-7463

DOI - 10.1021/la9812424

Subject(s) - viscoelasticity , rheometry , polymer , emulsion , elasticity (physics) , materials science , rheology , solvent , elastic modulus , dynamic mechanical analysis , polymer chemistry , chemical engineering , chemistry , thermodynamics , composite material , organic chemistry , engineering , physics

Using rheometry and light scattering, we have studied the viscoelasticity of gels formed by the kinetically arrested phase separation in an emulsion-polymer mixture; to prevent the gels from collapsing under their own weight, we have used an isopycnic solvent. At constant osmotic pressure (set by the polymer concentration) and droplet volume fractions well above the gelation transition, we find the elastic modulus to increase roughly linearly with , indicating an entropic elasticity based on the cluster packing.

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