Dynamical properties of different models of elastic polymer rings : Confirming the link between deformation and fragility
Gnan, Nicoletta ; Camerin, Fabrizio LU
; Del Monte, Giovanni
; Ninarello, Andrea
and Zaccarelli, Emanuela
(2021)
In Journal of Chemical Physics
154(15).
- 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 [N. Gnan and E. 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... (More)
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 [N. Gnan and E. 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 a 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.
(Less)
- author
- Gnan, Nicoletta
; Camerin, Fabrizio
LU
; Del Monte, Giovanni
; Ninarello, Andrea
and Zaccarelli, Emanuela
- publishing date
- 2021-04-21
- type
- Contribution to journal
- publication status
- published
- in
- Journal of Chemical Physics
- volume
- 154
- issue
- 15
- article number
- 154901
- publisher
- American Institute of Physics (AIP)
- external identifiers
-
- pmid:33887924
- scopus:85104131125
- ISSN
- 0021-9606
- DOI
- 10.1063/5.0041264
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2021 Author(s).
- id
- 6b767400-46fa-4e0c-b768-98bfa34e7964
- date added to LUP
- 2024-02-22 14:11:46
- date last changed
- 2024-04-23 16:12:42
@article{6b767400-46fa-4e0c-b768-98bfa34e7964,
abstract = {{<p>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 [N. Gnan and E. 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 a 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.</p>}},
author = {{Gnan, Nicoletta and Camerin, Fabrizio and Del Monte, Giovanni and Ninarello, Andrea and Zaccarelli, Emanuela}},
issn = {{0021-9606}},
language = {{eng}},
month = {{04}},
number = {{15}},
publisher = {{American Institute of Physics (AIP)}},
series = {{Journal of Chemical Physics}},
title = {{Dynamical properties of different models of elastic polymer rings : Confirming the link between deformation and fragility}},
url = {{http://dx.doi.org/10.1063/5.0041264}},
doi = {{10.1063/5.0041264}},
volume = {{154}},
year = {{2021}},
}