The Microscopic Role Of Deformation In The Dynamics Of Soft Colloids

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Local Elasticity in Nonlinear Rheology of Interacting

31,32 On the other hand, the role of local elasticity in determining the rheological behavior of soft matters has also been discussed.33,34 For many soft glasses, such as microgels, polymeric materials, foams and emulsions, the constitutive particles or molecules are deformable and possess significant elasticity.

Yielding of Hard-Sphere Glasses during Start-Up Shear

[11], metallic glasses [12], soft colloids [13], and colloidal gels[14]showaninitialstressincrease,oftenfollowedbya stress overshoot before the steady state is reached. For HS suspensions, mode coupling theory, molecular dynamics simulations, and confocal microscopy [15,16] indicate a relation of the stress overshoot with a superdiffusive par-

Particle dynamics predicts shear rheology of soft particle

often used in previous investigations. Elastic deformations caused by soft potentials have been shown to play an important role in the dynamics of soft colloids [4, 23, 24]. In brief the connection between non affine particle trajectories, mesoscopic properties and macroscopic rheology in real 3D SPGs remains an outstanding challenge.

arXiv:0906.2053v1 [cond-mat.soft] 11 Jun 2009

a crucial role in the elasto-plastic response of the amorphous material. For a small macroscopic shear and colloids [10, 11, 12] as well as in numerous simu- dynamics of these irreversible

Volume fraction variations and dilation in colloids and granulars

fraction, to which response and dynamics will be particularly susceptible around the 'divergence' of the glass transition. It seems reasonable therefore that dilation/fluid effects important in wet granulars will also be important in concentrated colloids. Experiments are under way to test for the presence of

Journal of Physics: Condensed Matter PAPER Related content

Microgels are soft colloids that, by virtue of their polymeric nature, can react to external stimuli such as temperature or pH by changing their size. The resulting swelling/deswelling transition can be exploited in fundamental research as well as for many diverse practical applications, ranging from art restoration to medicine.

Schematic mode coupling theory of glass rheology : single and

ITT-MCT is a microscopic theory. It takes the static structure factor ofthe quiescent system as input, and can therefore predict, in principle, rheological differences between collaidal systems with different interactions (hard and soft colloids; colloids with 01' without attractive interactions, ete.). Unfortunately however,

Elastocapillarycoalescence rspa.royalsocietypublishing.org

method to compute the aggregation dynamics. In §2, we describe the experimental observations for the two-dimensional case, derive a discrete two-plate model for the deformation of the plates driven by capillary forces, and carry out a linear stability analysis of the base state. We then study the coalescence dynamics of a

Time-Rate-Transformation framework for targeted assembly of

soft material. Recent advances in imaging techniques, as well as computational studies of particle assembly under quiescent conditions, have brought invaluable insight into the microscopic physics and dynamics of these particulate structures [6-10]; however, the resulting colloidal assemblies

On the viscosity of adhesive hard sphere dispersions

Colloidal gels are common soft materials with highly tunable mechanical and transport properties that make them prevalent in numerous industrial, environmental, and biological processes and systems [1{3]. Short-ranged attractions among colloids in solution act as transient physical bonds that cause aggregation leading to the for-

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a large difference in the dynamics between the components of a mixture, phase sepa-ration tends to proceed in a speed between that of the fast and slow components. Then, the slow component cannot catch up with a deformation rate spontaneously generated by phase separation itself, s d, and thus starts to behave as an elastic

Final Report

in polymer physics, our results indicate that long-ranged hydrodynamic interactions play a crucial role in determining the microscopic dynamics and macroscopic properties of the colloidal dispersions. A computational model neglecting hydrodynamic interactions will yield erroneous estimates of G(t), G(!)

Contents

10:30 Surface Active Microgels: a step towards soft stabilisers CROSBY, David 10:50 Strongly heterogeneous motion at the depinning transition in dense dispersions FUCHS, Matthias 11:10 The microscopic role of deformation in the dynamics of soft colloids GNAN Nicoletta

CNR-ISC (National Research Council - Institute for Complex

The microscopic role of deformation in the dynamics of soft colloids Nicoletta Gnan and Emanuela Zaccarelli CNR-ISC (National Research Council - Institute for Complex Systems) and Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185 Roma, Italy (Dated: November 26, 2018)

arXiv:1808.01533v1 [cond-mat.soft] 4 Aug 2018

deformation. Introduction { Colloidal gels are soft matter with dis-ordered structure and slow dynamics due to short-range, attractive inter-particle forces [1, 2]. The attractive inter-actions stabilize a sample-spanning network of particles. This network displays mechanical features of a soft solid,

As featured in

microscopic mechanism of the flow of interacting colloidal suspensions demands further studies. In this work, we investigate the relation between the micro-scopic structure and rheology of a charge-stabilized colloidal glass as a model colloidal system with soft repulsive inter-actions. One reason for the current excitement stems from the

Linking self-assembly, rheology, and gel transition in

Self-assembly in binary mixtures of dipolar colloids: Molecular dynamics simulations J. Chem. Phys. 133, 064511 (2010); 10.1063/1.3477985 Rheology of transient colloidal gels by Brownian dynamics computer simulation

XV International Workshop on Complex Systems

The microscopic role of deformation in the dynamics of soft colloids Nicoletta Gnan 17.30 Microscopic pathways for stress relaxation in repulsive colloidal glasses Alessandro Martinelli 17.45 - 18.05 Coffee Break 6

Direct 3D observation of topological defect dynamics in

Soft materials such as polymer gels and liquid crystals have complex internal structure. In these substances, internal degrees of freedom with microscopic and mesoscopic length scale (e.g., liquid crystalline order) couples to macroscopic deformation of the substances, which leads to soft elasticity and cross-coupling effects.

EDUCATION 1999-2002 PhD

The microscopic role of deformation in the dynamics of soft colloids PUBLICATION RECORD: h-index=38, t otal number of citations: > 6000 ( source Web of Science 02/2019)

Time-rate-transformation framework for targeted assembly of

of the resulting soft material. Recent advances in imaging tech-niques and computational studies of particle assembly under quiescent conditions have brought invaluable insight into the microscopic physics and dynamics of these particulate structures [6e10]; however, the resulting colloidal assemblies evolve and

Mohamed Daoud Claudine E.Williams Editors Soft Matter Physics

1.6 Droplet Spreading Dynamics 22 1.7 Forced Wetting 25 1.7.1 Experiment (Designed by D. Quere) 25 1.7.2 The Minimum Speed for Film Deposition 26 1.7.3 Film Thickness on a Fibre (or in a Capillary Tube) 27 1.8 Dewetting 29 1.8.1 Thick Film Dewetting 30 1.8.2 Microscopic Film Dewetting 32

Swiss Soft Days

Mechanics plays a central role in the design of new materials, providing the fundamental rules and guidelines for predicting the response of engineered systems. The starting points of our research are well understood nonlinear local phenomena, such as elastic Hertzian contact interactions between particles, or the deformation of micro- and nano-

MATERIALS

of microscopic predictive and unified theories of the structure, phase behavior and slow dynamics of complex liquids, glasses and gels. Complex liquids, glasses and gels include a vast array of materials-relevant soft materials, including polymers, colloids, nanoparticles and liquid crystals. Gels and glasses are nonequilibrium solid amorphous

Mesoscale simulation of soft particles with tunable contact

Mesoscale simulation of soft particles with tunable contact angle in multicomponent fluids Maarten Wouters, 1 ,* Othmane Aouane, 2 † Timm Krüger, 3 ,‡ and Jens Harting 2 1 § 1 Department of Applied Physics, Eindhoven University of Technology, De Rondom 70, 5612 AP, Eindhoven, the Netherlands

Polymer and So Contact Info Matter Physics

15. Glassy dynamics of crystallite formation: The role of covalent bonds R. S. Hoy and C. S. O Hern; Soft Matter, 8, 1215 (2012) 14. Why is understanding glassy polymer mechanics so di cult? R. S. Hoy, J. Polym. Sci. Part B: Polym. Phys., 49, 979 (2011) 13. End grafted polymer nanoparticles in a polymeric matrix: E ect of coverage and curvature

Microgels as viscosity modifiers influence lubrication

Microgels are soft colloids made of cross-linked polymers that the role of the continuous phase i.e., the continuum in which dynamics and configuration of these components contribute

Interdisciplinary Challenges in Non-equilibrium Physics

11.30 Nicoletta Gnan, The microscopic role of deformation in the dynamics of soft colloids 12.00 Jan Meibohm, Catastrophes and Large deviations in turbulent aerosols 12.30 Romain Mari, Dynamic vorticity banding in discontinuously shear thickening suspensions 13.00 Lunch Session 5 Slow Relaxation

Reversibility and hysteresis of the sharp yielding transition

croscopic deformation of slowly deformed glasses [13 22]. Colloidal glasses have played an important role in directly visualizing these microscopic correlations. The particles exhibit dynamic arrest due to crowding at particle vol-ume fractions above φ g ∼ 0.58, the colloidal glass transi-tion [23,24], and they have been used extensively

Microgels at Interfaces Behave as 2D Elastic Particles

the microscopic level cannot be described in these terms. This is especially true for soft polymeric colloids that possess internal degrees of freedom endowing them with elasticity and deformability. Among the available library of soft deformable particles, microgels, colloidal-sized cross-linked polymer networks, are one of the finest

doc.rero

response can offer a more sensitive probe of the dynamics. This holds in particular for the case of reversing double step strains, where the steps act in opposite directions: g 0 > 0 but g 1 < 0. The case where the total strain imposed on the system vanishes, g T ¼ g 0 + g 1 ¼ 0, allows an especially clear assessment of the deformation energy

Remi Dreyfus (Rhodia): Michael Falk (Hopkins): Alison Sweeney

Microscopic and mechanical properties of reversible plastic deformation 4. JoelLefever(UniversityofPennsylvania) Searching for soft spots in amorphous nanoparticle packings using atomic force microscopy 5. DavidA.Gagnon(UniversityofPennsylvania) Undulatory swimming in fluids with polymer networks 6. JohnRoyer(NIST) Dynamics of Cubic Colloids 7.

Report of the Undergraduate Curriculum Committee

MSEN 250. Soft Matter. (3-0). Credit 3. Structure, properties and function of various classes of soft matter including colloids, polymers, amphiphils, liquid crystals and biomacromolecules; basic concepts of viscoelasticity, glass transition, liquid-liquid and liquid-solid transitions and gelation; forces acting

Photocontrollable Deformations of Polymer Particles in

b) Dynamics of the deformation process for particles of different sizes (intensity: −2). c) The influence of light intensity on particle deformation dynamics ≈1.7 W cm (particles size: ≈6.5µm). Insets deformation rates versus particle size and intensity of UV light. d) BF optical images of the composite before and

Glassy Spin Dynamics in Geometrically Frustrated Buckled

system and shows the structure-dynamics correlations. Figures 3 and 4 characterize the glassy dynamics as the main contribution of this paper, i.e., the first microscopic observation of glassiness in geometrically frustrated latti-ces. Figures. 5 9 are about the role of facilitation on spin relaxation. This paper bridges two fields (geometrical

COLLOIDAL TRANSPORT IN LIQUID CRYSTALS AND CONNECTIONS

spectroscopy (XPCS) to interrogate how shear-induced microscopic structural dynamics connects with the macroscopic deformation and flow properties in a set of soft disordered solids including concentrated nanocolloidal gels. This work was conducted under the supervision of Prof. Robert L. Leheny. The

Interfacial Particle Dynamics: One and Two Step Yielding in

microscopic mechanics in the non-linear flow regime and especially the correlation to the shear-induced structure remains poorly understood. For instance, the microscopic origin of non-linearity associated with yielding in particulate systems, which reflects cage deformation, breaking and particle displacement is largely unexplored.

Elastocapillarycoalescence rspa.royalsocietypublishing.org

method to compute the aggregation dynamics. In §2, we describe the experimental observations for the two-dimensional case, derive a discrete two-plate model for the deformation of the plates driven by capillary forces, and carry out a linear stability analysis of the base state. We then study the coalescence dynamics of a

Contents

The microscopic role of deformation in the dynamics of soft colloids Nicoletta Gnan 17.30 Microscopic pathways for stress relaxation in repulsive colloidal glasses Alessandro Martinelli 17.45 - 18.05 Coffee Break 8

Shape control and compartmentalization in active colloidal cells

Aug 06, 2015 and active spinners on the boundary. We use the microscopic model while varying two parameters: the number of boundary segments n and the driving torque on the boundary τ. As shown in Fig. 2A and Movie S1, the effect of the active boundary is a deformation of the cell shape. The shape deformation follows