Skip to Main content Skip to Navigation
Journal articles

Superposition of small strains on large: Some counterintuitive results for a concentrated colloidal system

Abstract : The rheological response of a colloidal system concentrated to near the glass concentration has been investigated using a cone and plate geometry. The prime purpose of the work was to interrogate the nonlinear response using the so-called "tickle" experiment in which small deformations are superimposed on a single large deformation to probe "rejuvenation" and "reinitiated aging" behaviors as has been done in polymer glasses and solutions. Counterintuitively, we find that the superposition of a small positive probe onto the large deformation gives different results from the superposition of a small negative probe. Such a result is contrary to simple fading memory ideas of viscoelastic materials. We also find that the rejuvenation and reinitiated aging behavior in the positive probe case is dependent on whether one considers the probes at "first" probe or at "second" probe, in spite of following the protocol first suggested by Struik [Physical Aging in Amorphous Polymers and Other Materials (Elsevier, Amsterdam, 1978)], which avoids sequence effects in viscoelastic materials. It is suggested that colloidal systems, while exhibiting some features of fading memory behavior that is expected in molecular (polymer) glasses, in fact also undergo a mechanically induced structural change, perhaps similar to that found in highly filled materials such as rocket propellants and carbon black filled rubber
Complete list of metadatas

https://hal.sorbonne-universite.fr/hal-01537688
Contributor : Bruno Publis_simm <>
Submitted on : Monday, June 12, 2017 - 5:50:58 PM
Last modification on : Wednesday, October 14, 2020 - 4:18:11 AM

Identifiers

Citation

Gregory B. Mckenna, Tetsuharu Narita, François Lequeux. Superposition of small strains on large: Some counterintuitive results for a concentrated colloidal system. Journal of Rheology, American Institute of Physics, 2013, 57 (6), pp.1803 - 1818. ⟨10.1122/1.4826112⟩. ⟨hal-01537688⟩

Share

Metrics

Record views

251