Dynamical properties of different models of elastic polymer rings: confirming the link between deformation and fragility
arXiv:2106.02413 · doi:10.1063/5.0041264
Abstract
We report extensive numerical simulations of different models of 2D polymer rings with internal elasticity. We monitor the dynamical behavior of the rings as a function of the packing fraction, to address the effects of particle deformation on the collective response of the system. In particular, we compare three different models: (i) a recently investigated model [Gnan \& Zaccarelli, Nat. Phys. 15, 683 (2019)], where an inner hertzian field providing the internal elasticity acts on the monomers of the ring, (ii) the same model where the effect of such a field on the center of mass is balanced by opposite forces and (iii) a semi-flexible model where an angular potential between adjacent monomers induces strong particle deformations. By analyzing the dynamics of the three models, we find that, in all cases, there exists a direct link between the system fragility and particle asphericity. Among the three, only the first model displays anomalous dynamics in the form of a super-diffusive behavior of the mean squared displacement and of a compressed exponential relaxation of the density auto-correlation function. We show that this is due to the combination of internal elasticity and the out-of-equilibrium force self-generated by each ring, both of which are necessary ingredients to induce such peculiar behavior often observed in experiments of colloidal gels. These findings reinforce the role of particle deformation, connected to internal elasticity, in driving the dynamical response of dense soft particles.
arXiv comment13 pages, 15 figures
References in corpus (21)
- Athermal Phase Separation of Self-Propelled Particles with no Alignment
- Molecular Dynamics Simulation Study of Nonconcatenated Ring Polymers in a Melt: I. Statics
- Molecular Dynamics Simulation Study of Nonconcatenated Ring Polymers in a Melt: II. Dynamics
- Multidimensional Stationary Probability Distribution for Interacting Active Particles
- "In silico" synthesis of microgel particles
- A new look at effective interactions between microgel particles
- Effective interaction between star polymers
- Elastically driven, intermittent microscopic dynamics in soft solids
- A Topologically Driven Glass in Ring Polymers
- Relationship between Rheology and Structure of Interpenetrating, Deforming and Compressing Microgels
- The microscopic role of deformation in the dynamics of soft colloids
- The glass transition of soft colloids
- Increasing the density melts ultrasoft colloidal glasses
- Effective interactions between star polymers and colloidal particles
- Numerical modelling of non-ionic microgels: an overview
- Connecting elasticity and effective interactions of neutral microgels: the validity of the Hertzian model
- Swelling, Structure, and Phase Stability of Compressible Microgels
- Dynamical behavior of microgels of Interpenetrated Polymer Networks
- Structural and microscopic relaxations in a colloidal glass
- Microgels at interfaces behave as 2D elastic particles featuring reentrant dynamics
- Structure and dynamics of responsive colloids with dynamical polydispersity