Gulliver

Effect of solvent structure on the Wien effect and ionic correlations at the nanoscale

Jeldy Cubas Hernandez — 2026-05-21T09:10:52Z

In this study, we examine how the structure of the solvent affects the correlations and conductivity of moderately concentrated electrolytes. We describe polar solvents with a nonlocal permittivity, ε(k), which we then incorporate into stochastic density functional theory (SDFT), focusing on ion transport in water. Using nonlocal SDFT and classical molecular dynamics simulations, we study the ionic hydration shell and its deformation under an electrostatic field. This allows us to identify (…)

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Compositional memory matters for early molecular systems

Jeldy Cubas Hernandez — 2026-05-21T09:04:10Z

The error catastrophe refers to the proliferation of nonfunctional molecules in conditions where molecular replication has low accuracy, which is likely to correspond to conditions present at the Origin of Life. This error catastrophe can be avoided thanks to transient compartmentalization, provided that the compartments are sufficiently tight to prevent molecular leakage. Typically, transient compartmentalization models assume that the content of the compartments is completely pooled (…)

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Gulliver is pleased to welcome Mark Ediger as a Saint Gobain chair for a one month period

Jeldy Cubas Hernandez — 2026-05-21T08:43:30Z

Mark's research focuses on developing a molecular-level understanding of dynamics in polymeric materials and low molecular weight glass formers. He will give a seminar in the lab on June 1st.
DOI: https://chem.wisc.edu/staff/ediger-...

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pH gradient-driven deformation of a crista-like vesicle

Jeldy Cubas Hernandez — 2026-05-04T09:53:58Z

The inner membrane of mitochondria presents folds, the cristae, which are the production place of ATP. This synthesis is catalized by transmembrane proteins and relies on a flow of protons confined to the surface of the membrane. We posit that, in turn, the proton flux shapes the crista membrane in a way that suits these proteins. To study this hypothesis, we model a crista as a spherical vesicle submitted to a diffusive proton gradient flowing from the poles to the equator. Using Helfrich (…)

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France-Japan DNA encryption

Olivier Dauchot — 2026-04-02T13:20:17Z

Synchronized DNA sources for unconditionally secure cryptography
Congratulation to Sandra, Victoria, Vassily, Matthieu, Yannick and all the team for this world premiere. ArXiv paper Vidéo Présidence Vidéo du CNRS Le monde Libération La voix du Nord

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Spreading and absorption of silicone oil droplets on silicone elastomer films

Jeldy Cubas Hernandez — 2026-03-27T15:34:26Z

When a liquid droplet completely wets a hard substrate, its spreading dynamics follow Tanner's law, with the droplet radius growing as the one-tenth power of time. Here, we investigate how these dynamics change when silicone oil droplets spread on soft silicone elastomer and gel films supported by a rigid silicon substrate. While the droplets fully wet the elastomer surface, they also simultaneously swell the elastomer film. By varying the film thickness, we observe deviations from the (…)

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Francois Villemot joins Gulliver

Jeldy Cubas Hernandez — 2026-01-20T12:02:38Z

We are pleased to welcome Francois Villemot as our new CNRS research engineer in Gulliver. Francois obtained his PhD in Montpellier in 2014, followed by postdoctoral positions in the USA and Paris, and several years at a Paris-based start-up He joins us to support fundamental research, in particular regarding numerical methods and computational infrastructure.

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Tunable Poly(butylene oxide)-stat-polyglycidol Copolymers for Microfluidic-Assisted Nanoprecipitation Nanoparticle Design

Jeldy Cubas Hernandez — 2026-01-06T09:50:45Z

The self-assembly of amphiphilic copolymers into well-defined nanoparticles depends on the interplay among polymer composition, solvent exchange kinetics, and processing conditions. In this study, we explore the anionic ring-opening copolymerization of 1,2-epoxybutane and ethoxyethyl glycidyl ether (EEGE) followed by a deprotection step to synthesize poly(butylene oxide)-stat-polyglycidol (PBO-stat-PG) copolymers with tunable amphiphilicity. Reactivity ratio analysis confirmed the formation (…)

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Symmetry-driven artificial phononic media

Jeldy Cubas Hernandez — 2026-01-05T11:12:05Z

Phonons are quasiparticles associated with mechanical vibrations in materials. They are at the root of the propagation of sound and elastic waves, as well as of thermal phenomena, which are pervasive in our everyday life and in many technologies. The fundamental understanding and control of phonon responses in natural and artificial media are key in the context of communications, isolation, energy harvesting and control, sensing and imaging. It has recently been realized that controlling (…)

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Transition to Collective Motion in Nonreciprocal Active Matter: Coarse Graining Agent-Based Models into Fluctuating Hydrodynamics

Jeldy Cubas Hernandez — 2026-01-05T10:57:47Z

Two hallmarks of nonequilibrium systems, from active colloids to animal herds, are agent motility and nonreciprocal interactions. Their interplay creates feedback loops that lead to complex spatiotemporal dynamics crucial to understand and control the nonlinear response of active systems. Here, we introduce a minimal model that captures these two features at the microscopic scale while admitting an exact hydrodynamic theory valid also in the fully nonlinear regime. Using statistical (…)

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