A5082705424- Material Dynamics and Properties
- Theoretical and Computational Physics
- Surface Modification and Superhydrophobicity
- Protein Structure and Dynamics
- Advanced Thermodynamics and Statistical Mechanics
- Adhesion, Friction, and Surface Interactions
- Phase Equilibria and Thermodynamics
- Science and Science Education
- nanoparticles nucleation surface interactions
- Liquid Crystal Research Advancements
- Fluid Dynamics and Heat Transfer
- RNA and protein synthesis mechanisms
- Spectroscopy and Quantum Chemical Studies
- Glass properties and applications
- Granular flow and fluidized beds
- Advanced Sensor and Energy Harvesting Materials
- Gender, Sexuality, and Education
- Hemoglobin structure and function
- Catalytic Processes in Materials Science
- Micro and Nano Robotics
- Opinion Dynamics and Social Influence
- Evolution and Genetic Dynamics
- Evolutionary Game Theory and Cooperation
- Mathematical and Theoretical Epidemiology and Ecology Models
- Pickering emulsions and particle stabilization
Universidade Federal do Rio Grande do Sul
2016-2025
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro
2025
École Polytechnique Fédérale de Lausanne
2019-2023
Pontifical Catholic University of Rio de Janeiro
2020
Centre de Référence Déficits Immunitaires Héréditaires
2017
Assistance Publique – Hôpitaux de Paris
2017
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2003-2010
CEA Paris-Saclay
2003-2010
Centre National de la Recherche Scientifique
2010
Leiden University
2010
We conduct experiments on two-dimensional packings of colloidal thermosensitive hydrogel particles whose packing fraction can be tuned above the jamming transition by varying temperature. By measuring displacement correlations between particles, we extract vibrational properties a corresponding ``shadow'' system with same configuration and interactions, but for which dynamics are undamped. The very similar to those predicted zero-temperature sphere found in atomic molecular glasses; there is...
Significance In allosteric proteins, binding a ligand affects activity at distant site. The physical principles allowing for such an action distance are not well understood. Here we introduce numerical scheme to evolve materials in which the number of solutions, their spatial architectures, and correlations among them can be computed. We show that allostery these uses recently discovered elastic edge modes near active site transmit information, generated during evolution alone reveal key...
Significance How a liquid becomes rigid at the glass transition is central problem in condensed matter physics. In many scenarios of transition, liquids go through critical temperature below which minima free energy appear. However, even simplest glass, hard spheres, what confers mechanical stability large density highly debated. this work we show that to quantitatively understand microscopic level, presence weakly interacting pairs particles must be included. This approach allows us predict...
We derive a microscopic criterion for the stability of hard sphere configurations and we show empirically that this is marginally satisfied in glass. This observation supports geometric interpretation initial rapid rise viscosity with packing fraction or previtrification. It also implies barely stable soft modes characterize glass structure, whose spatial extension estimated. both short-term dynamics activation processes occur mostly along those study some implications these observations....
Amorphous packings of non-spherical particles such as ellipsoids and spherocylinders are known to be hypostatic: the number mechanical contacts between is smaller than degrees freedom, thus violating Maxwell's stability criterion. In this work, we propose a general theory hypostatic amorphous associated jamming transition. First, show that many systems fall into same universality class. As an example, explicitly map system `breathing' particles. We by using marginal argument in both cases...
We present a model and protocol that enable the generation of extremely stable computer glasses at minimal computational cost. The consists an instantaneous quench in augmented potential energy landscape, with particle radii as additional degrees freedom. demonstrate how our glasses' mechanical stability, which is readily tunable approach, reflected both microscopic macroscopic observables. Our observations indicate stability least comparable to generated by celebrated Swap Monte Carlo...
In a recent publication we established an analogy between the free energy of hard sphere system and elastic network. This result enables one to study landscape spheres, which was previously accessible only via density functional theory. our formalism normal modes can easily be defined computed. this work use these tools analyze activated transitions meta-basins, both in ageing regime deep glass phase near transition. We observe numerically that structural relaxation occurs mostly along very...
The study of the jamming transition granular and colloidal systems, has lead to a proliferation theoretical numerical results formulated in language eigenspectrum dynamical matrix for these disordered systems. Only recently however, have modes been accessed experimentally media, by computing eigenmodes covariance particle positions. At same time, new conceptual methodological questions regarding interpretation appeared. In present paper, we first give an overview framework which is...
Swap algorithms have provided recent insights into how liquids solidify glass, but why they work is unknown. A new analysis shows that the answer lies in an effective potential describes size and interactions of particles.
We study the glass transition by exploring a broad class of kinetic rules that can significantly modify normal dynamics supercooled liquids while maintaining thermal equilibrium. Beyond usual liquids, this includes in which fraction $(1\ensuremath{-}{f}_{R})$ particles perform pairwise exchange or ``swap moves,'' ${f}_{P}$ move only along restricted directions. find (i) location varies greatly but smoothly as and ${f}_{R}$ change (ii) it is governed linear combination ${f}_{R}$. (iii)...
Oil has become a prevalent global pollutant, stimulating the research to improve techniques separate oil from water. Materials with special wetting properties—primarily those that repel water while attracting oil—have been proposed as suitable candidates for this task. However, one limitation in developing efficient substrates is limited available volume absorption. In study, we investigate efficacy of disordered fractal materials addressing challenge, leveraging their unique properties....
The canopy leaves of allomorphic aroid vines can exceed 2,000 cm 2 , up to 30 times larger than respective understorey leaves. In the literature, this increase in leaf area was hypothesized improve its light foraging capacity. viability these large depends on carbon acquisition obtained from their and costs production, maintenance support. To evaluate understand how enlargement affects performance, we analyzed photosynthesis respiration Epipremnum aureum different sizes via photosynthetic...
The dynamics of granular media in the jammed, glassy region is described terms "modes", by applying a principal component analysis (PCA) to covariance matrix position individual grains. We first demonstrate that this description justified and gives sensible results regime time/densities such metastable state can be observed on long enough timescale define reference configuration. For small times/system sizes, or at high packing fractions, spectral properties reveals large, collective...
Recent studies have shown that diversity in race and gender is important to improve competitiveness, creativity innovation. However, many the universe of science not diverse none these criteria. In this work, we quantify geographic Brazilian science. We study detail profile titular members most prestigious academic institution Brazil, Academy Sciences (ABC). Our analysis shows ABC concentrates 80% Southeast region overwhelming majority composed by men. show female male researchers roughly...
When a drop of water is placed on rough surface, there are two possible extreme regimes wetting: the one called Cassie-Baxter (CB) with air pockets trapped underneath droplet and characterized by homogeneous wetting Wenzel (W) state. A way to investigate transition between these states means evaporation experiments, in which starts CB state and, as its volume decreases, penetrates surface's grooves, reaching W Here we present theoretical model based global interfacial energies for that...
In allosteric proteins, the binding of a ligand modifies function at distant active site. Such pathways can be used as target for drug design, generating considerable interest in inferring them from sequence alignment data. Currently, different methods lead to conflicting results, particular on existence long-range evolutionary couplings between amino-acids mediating allostery. Here we propose resolution this conundrum, by studying epistasis and its inference models where an material is...
We study the conditions for persistent cooperation in an off-lattice model of mobile agents playing Prisoner's Dilemma game with pure, unconditional strategies. Each agent has exclusion radius rP, which accounts population viscosity, and interaction rint, defines instantaneous contact network dynamics. show that, differently from rP=0 case, finite-sized presents a coexistence phase both cooperators defectors, besides two absorbing phases, either or defectors dominate. provide, addition,...
We study the disordered, multispiral solutions of two-dimensional oscillatory media for parameter values at which single-spiral/vortex solution is fully stable. Using complex Ginzburg-Landau (CGLE) equation, we show that these states, heretofore believed to be static, actually evolve extremely slowly. This achieved via a reduction CGLE evolution sole vortex coordinates. true defect-mediated turbulence occurs in two distinct phases, liquid characterized by normal diffusion spirals, and slowly...
Herein is presented a methodology to quantify the degree of hexagonal order in nanoporous alumina arrays (NAA). The approach inspired by theory two-dimensional melting, developed describe phase transitions systems that present liquid-crystal-like structures. A local parameter (LOP) defined each pore without any arbitrary parameters. Using this LOP, three main qualitative and quantitative analytical tools were developed: (i) color code create map which visual tool identify order; (ii)...
We introduce a new model to study the effect of surface roughness on jamming transition. By performing numerical simulations, we show that for smooth surface, transition density and contact number at point both increase upon increasing asphericity, as ellipsoids spherocylinders. Conversely, rough quantities decrease, in quantitative agreement with behavior frictional particles. Furthermore, limit corresponding Coulomb friction law, satisfies generalized isostaticity criterion proposed...