Tootfinder

Surface Charge Relaxation Controls the Lifetime of Out-of-Equilibrium Colloidal Crystals
Laura Jansen, Thijs ter Rele, Marjolein Dijkstra
https://arxiv.org/abs/2507.14328

Surface Charge Relaxation Controls the Lifetime of Out-of-Equilibrium Colloidal Crystals
Interactions between charged colloidal particles are profoundly influenced by charge regulation and charge renormalization, rendering the effective potential highly sensitive to local particle density. In this work, we investigate how a dynamically evolving, density-dependent Yukawa interaction affects the stability of out-of-equilibrium colloidal structures. Motivated by a series of experiments where unexpectedly long-lived colloidal crystals have suggested the presence of like-charged attract…

Instabilities in Colloidal Crystals on Fluid Membranes
Sanjay Dharmavaram, Basant Lal Sharma
https://arxiv.org/abs/2506.17098 https://

Instabilities in Colloidal Crystals on Fluid Membranes
The complex physics of self-assembly in colloidal crystals on deformable interfaces and surfaces poses interesting possibilities for the designability and synthesis of next-generation metamaterials. The goal of this article is to characterize instabilities arising in colloidal crystals assembled on fluid membranes. The colloidal particles are modeled as pair-wise interacting point particles, constrained to lie on a fluid membrane and yet free to reorganize, and the membrane's elastic energy is …

Room-Temperature Surface Exciton Polaritons in Colloidal J-Aggregate Flakes
Carla Est\'evez-Varela, Jos\'e Nuno Gama, Miguel Castillo, Adelaide Miranda, Pieter De Beule, Jorge P\'erez-Juste, Martin Lopez-Garcia, Isabel Pastoriza-Santos, Sara N\'u\~nez-S\'anchez
https://arxiv.org/abs/2507.13784

Room-Temperature Surface Exciton Polaritons in Colloidal J-Aggregate Flakes
J-aggregates are promising organic materials for nanophotonic applications due to their excitonic properties and ability to support surface exciton polaritons at room temperature, providing a robust platform for nanoscale light manipulation. While thin films composed of J-aggregates have demonstrated these advantages, colloidal J-aggregate nanoparticles remain underexplored. Herein, we report the synthesis of colloidal J-aggregate flakes by electrostatic interaction of cyanine molecules (TDBC) …

Automatic layout of railroad diagrams
Shardul Chiplunkar, Cl\'ement Pit-Claudel
https://arxiv.org/abs/2509.15834 https://arxiv.org/pdf/2509.15834

Automatic layout of railroad diagrams
Railroad diagrams (also called "syntax diagrams") are a common, intuitive visualization of grammars, but limited tooling and a lack of formal attention to their layout mostly confines them to hand-drawn documentation. We present the first formal treatment of railroad diagram layout along with a principled, practical implementation. We characterize the problem as compiling a *diagram language* (specifying conceptual components and how they connect and compose) to a *layout language* (specifying …

A general model for frictional contacts in colloidal systems
Kay Hofmann, Kay-Robert Dormann, Benno Liebchen, Friederike Schmid
https://arxiv.org/abs/2507.16388

A general model for frictional contacts in colloidal systems
In simulations of colloidal matter, frictional contacts between particles are often neglected. For spherical colloids, such an approximation can be problematic, since frictional contacts couple translational and rotational degrees of freedom, which may affect the collective behavior of, e.g., colloids under shear and chiral active matter. Deterministic models for frictional contacts have been proposed in the granular matter community. On the colloidal scale, however, thermal fluctuations are im…

Thackeray's globules in IC 2944: the rocket effect revisited by ALMA
M. Fern\'andez-L\'opez (Instituto Argentino de Radioastronom\'ia, CONICET, Argentina, Facultad de Ciencias Astron\'omicas y Geof\'isicas, Universidad Nacional de La Plata, Argentina), L. A. Zapata (Instituto de Radioastronom\'ia y Astrof\'isica, Universidad Nacional Aut\'onoma de M\'exico, M\'exico), B. Reipurth (Institute for Astronomy, University of Hawaii at Manoa, USA), …

Thackeray's globules in IC 2944: the rocket effect revisited by ALMA
The prominent Thackeray's globules are a collection of cloudlets seen in silhouette against the bright emission of the IC 2944 HII region, ionized by the Collinder 249 cluster of early-type stars (placed at 2331$\pm$30 pc, derived from a Gaia DR3 analysis of the parallaxes of 11 massive stars). Here we present the analysis of Band 3 ALMA data that reveals the cold emission (continuum and molecular) associated with the neutral gas and its kinematic behavior. Many of the globules follow a linear …

Thermal History Asymmetry and Dissipation in Dense Colloidal Microgel Glasses
Sonali Vasant Kawale, Yogesh M Joshi, Ranjini Bandyopadhyay
https://arxiv.org/abs/2509.16697 https:…

Thermal History Asymmetry and Dissipation in Dense Colloidal Microgel Glasses
Microstructurally arrested matter, from molecular glasses to soft glassy materials, can retain a memory of their thermal or mechanical (shear) histories. Their history-dependent and nonlinear microstructural recoveries have been studied within the Kovacs framework. Here, we applied the temperature ramps of varying magnitudes to dense colloidal suspensions of thermoresponsive, deformable and compressible microgel particles should serve as an effective strategy to probe the nonlinear path-depende…

Nano-silica based Aqueous Colloidal Gels as Eco-friendly Thixotropic Lubricant
Arun Kumar, Vivek Kumar, Yogesh M. Joshi, Manjesh K. Singh
https://arxiv.org/abs/2506.16249

Nano-silica based Aqueous Colloidal Gels as Eco-friendly Thixotropic Lubricant
The environmental risks posed by traditional oil and grease-based lubricants can be significantly mitigated by adopting water-based alternatives engineered with superior rheological performance. In this work, we present a fundamentally new and environmentally sustainable aqueous thixotropic colloidal gel of silica nanoparticles formed in the presence of NaCl. We conducted a systematic and detailed investigation of their rheological and tribological characteristics. The tribological performance …

Competing Length Scales and Symmetry Frustration Govern Non-Universal Melting in 2D Core-softened Colloidal Crystals
Thiago Puccinelli, Alexandre V. Ilha, Jos\'e Rafael Bordin
https://arxiv.org/abs/2507.13573

Competing Length Scales and Symmetry Frustration Govern Non-Universal Melting in 2D Core-softened Colloidal Crystals
We investigate the melting behavior of two-dimensional colloidal crystals stabilized by a core-softened potential featuring two competing interaction length scales. Using molecular dynamics simulations, we analyze three polymorphic solid phases -- low-density triangular, stripe, and kagome -- and uncover distinct melting pathways. The triangular and kagome crystals undergo abrupt first-order transitions, driven by the interplay between energetic frustration and structural reorganization. In par…

Measurement of the attractive electrosolvation force between colloidal particles
Sida Wang, Angela Le, Rowan Walker-Gibbons, Madhavi Krishnan
https://arxiv.org/abs/2508.14652 ht…

Measurement of the attractive electrosolvation force between colloidal particles
Direct measurement of the pair interaction potential between electrically like-charged particles in solution reveals a strong and long-ranged attractive force. This counterintuitive attraction has been suggested to arise from the orientation of solvent molecules at the interface between the object and the electrolyte. Here we report measurements of pair interaction potentials between charged microspheres with a range of surface chemistries. We demonstrate that the range of the electrosolvation …