C. Patrick Royall
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View article: Cyclically sheared colloidal gels: structural change and delayed failure time
Cyclically sheared colloidal gels: structural change and delayed failure time Open
We present experiments and simulations on cyclically sheared colloidal gels, and probe their behaviour on several different length scales. The shearing induces structural changes in the experimental gel, changing particles' neighborhoods a…
View article: Yielding in colloidal gels: From local structure to mesoscale strand breakage and macroscopic failure
Yielding in colloidal gels: From local structure to mesoscale strand breakage and macroscopic failure Open
We report numerical simulations of creep flow and yielding of particulate depletion gels under constant shear stress, combining data on different length and time scales. We characterize the statistics of mesoscale strand-breaking events in…
View article: Traveling Strings of Active Dipolar Colloids
Traveling Strings of Active Dipolar Colloids Open
We study an intriguing new type of self-assembled active colloidal polymer system in 3D. It is obtained from a suspension of Janus particles in an electric field that induces parallel dipoles in the particles as well as self-propulsion in …
View article: Slipping and fluidisation in active crystalline rotors
Slipping and fluidisation in active crystalline rotors Open
Quincke roller active colloids self-assemble under confinement into rotors. A “magic number” of 61 particles forms a tiny crystallite which rotes and undergoes a series of slipping transitions as activity is increased.
View article: Dipolar colloids in three dimensions: non-equilibrium structure and re-entrant dynamics
Dipolar colloids in three dimensions: non-equilibrium structure and re-entrant dynamics Open
Colloids provide a unique platform in which to explore the effect of activity upon well-controlled thermal many-body systems. Until now, experiments have been largely limited to 2d. This work describes the phase behaviour and dynamics of a…
View article: Dimensionless Analytical Model for Non-Ideal Breakthrough in Fixed Beds: Application to Trivalent Amphoteric Oxide Sorbent Materials
Dimensionless Analytical Model for Non-Ideal Breakthrough in Fixed Beds: Application to Trivalent Amphoteric Oxide Sorbent Materials Open
View article: Cyclically sheared colloidal gels: structural change and delayed failure time
Cyclically sheared colloidal gels: structural change and delayed failure time Open
Experiments and simulations show how cyclic shearing affects the structure and dynamics of colloidal gels.
View article: Colloidal hard spheres: Triumphs, challenges, and mysteries
Colloidal hard spheres: Triumphs, challenges, and mysteries Open
International audience
View article: Identification and classification of clusters of dipolar colloids in an external field
Identification and classification of clusters of dipolar colloids in an external field Open
Colloids can acquire a dipolar interaction in the presence of an external AC electric field. At high field strength, the particles form strings in the field direction. However, at weaker field strength, competition with isotropic interacti…
View article: Colloidoscope: Detecting Dense Colloids in 3d with Deep Learning
Colloidoscope: Detecting Dense Colloids in 3d with Deep Learning Open
Colloidoscope is a deep learning pipeline employing a 3D residual Unet architecture, designed to enhance the tracking of dense colloidal suspensions through confocal microscopy. This methodology uses a simulated training dataset that refle…
View article: Identification and classification of clusters of dipolar colloids in an external field
Identification and classification of clusters of dipolar colloids in an external field Open
Colloids can acquire a dipolar interaction in the presence of an external electric field. At high field strength, the particles form strings in the field direction. However at weaker field strength, competition with isotropic interactions …
View article: Traveling strings of active dipolar colloids
Traveling strings of active dipolar colloids Open
We study an intriguing new type of self-assembled active colloidal polymer system in 3D. It is obtained from a suspension of Janus particles in an electric field that induces parallel dipoles in the particles as well as self-propulsion in …
View article: How effective are face coverings in reducing transmission of COVID-19?
How effective are face coverings in reducing transmission of COVID-19? Open
In the COVID–19 pandemic, billions are wearing face masks, in both health care settings and in public. Which type of mask we should wear in what situation, is therefore important. There are three basic types: cotton, surgical, and respirat…
View article: Complex flow profiles in microscopic active crystals
Complex flow profiles in microscopic active crystals Open
Active solids emerge from self-actuating components interacting with each other to form crystalline patterns. In equilibrium, commensurability underpins our understanding of nanoscale friction and particle-level dynamics of crystals. Howev…
View article: The glass transition in molecules, colloids and grains: universality and specificity
The glass transition in molecules, colloids and grains: universality and specificity Open
We highlight certain key achievements in experimental work on molecular, colloidal and granular glassformers. This short review considers these three classes of experimental systems and focusses largely on the work of the authors and their…
View article: Structural Signatures of Ultrastability in a Deposited Glassformer
Structural Signatures of Ultrastability in a Deposited Glassformer Open
Glasses obtained from vapor deposition on a cold substrate have superior thermodynamic and kinetic stability with respect to ordinary glasses. Here we perform molecular dynamics simulations of vapor deposition of a model glassformer and in…
View article: Colloidal Hard Spheres: Triumphs, Challenges and Mysteries
Colloidal Hard Spheres: Triumphs, Challenges and Mysteries Open
The simplicity of hard spheres as a model system is deceptive. Although the particles interact solely through volume exclusion, that nevertheless suffices for a wealth of static and dynamical phenomena to emerge, making the model an import…
View article: Structural signatures of ultrastability in a deposited glassformer
Structural signatures of ultrastability in a deposited glassformer Open
Glasses obtained from vapor deposition on a cold substrate have superior thermodynamic and kinetic stability with respect to ordinary glasses. Here we perform molecular dynamics simulations of vapor deposition of a model glass-former and i…
View article: Tuning Higher Order Structure in Colloidal Fluids
Tuning Higher Order Structure in Colloidal Fluids Open
Colloidal particles self assemble into a wide range of structures under external AC electric fields due to induced dipolar interactions [Yethiraj and Van Blaaderen Nature 421 513 (2003)]. As a result of these dipolar interactions, at low v…
View article: Active Brownian particles in random and porous environments
Active Brownian particles in random and porous environments Open
The transport of active particles may occur in complex environments, in which it emerges from the interplay between the mobility of the active components and the quenched disorder of the environment. Here, we explore the structural and dyn…
View article: Necking and failure of a colloidal gel arm: signatures of yielding on different length scales
Necking and failure of a colloidal gel arm: signatures of yielding on different length scales Open
Colloidal gels consist of percolating networks of interconnected arms. Their mechanical properties depend on the individual arms, and on their collective behaviour. We use numerical simulations to pull on a single arm, built from a model c…
View article: Biases in Inverse Ising Estimates of Near-Critical Behaviour
Biases in Inverse Ising Estimates of Near-Critical Behaviour Open
Inverse Ising inference allows pairwise interactions of complex binary systems to be reconstructed from empirical correlations. Typical estimators used for this inference, such as Pseudo-likelihood maximization (PLM), are biased. Using the…
View article: Controlling Kinetic Pathways in Demixing Microgel–Micelle Mixtures
Controlling Kinetic Pathways in Demixing Microgel–Micelle Mixtures Open
We investigate the temperature-dependent phase behavior of mixtures of poly(N-isopropylacrylamide) (pNIPAM) microgel colloids and a triblock copolymer (PEO-PPO-PEO) surfactant. Usually, gelation in these systems results from an i…
View article: Necking and failure of a particulate gel strand: signatures of yielding on different length scales
Necking and failure of a particulate gel strand: signatures of yielding on different length scales Open
“Sticky” spheres with a short-ranged attraction are a basic model of a wide range of materials from the atomic to the granular length scale.
View article: Stability of interlocked self-propelled dumbbell clusters
Stability of interlocked self-propelled dumbbell clusters Open
Combining experimental observations of Quincke roller clusters with computer simulations and a stability analysis, we explore the formation and stability of two interlocked self-propelled dumbbells. For large self-propulsion and significan…
View article: Many-Body Correlations Are Non-negligible in Both Fragile and Strong Glassformers
Many-Body Correlations Are Non-negligible in Both Fragile and Strong Glassformers Open
It is widely believed that the emergence of slow glassy dynamics is encoded in a material's microstructure. First-principles theory [mode-coupling theory (MCT)] is able to predict the dramatic slowdown of the dynamics from only static two-…
View article: Many-body correlations are non-negligible in both fragile and strong glassformers
Many-body correlations are non-negligible in both fragile and strong glassformers Open
It is widely believed that the emergence of slow glassy dynamics is encoded in a material's microstructure. First-principles theory [mode-coupling theory (MCT)] is able to predict the dramatic slowdown of the dynamics from only static two-…
View article: Direct imaging of contacts and forces in colloidal gels
Direct imaging of contacts and forces in colloidal gels Open
Colloidal dispersions are prized as model systems to understand the basic properties of materials and are central to a wide range of industries from cosmetics to foods to agrichemicals. Among the key developments in using colloids to addre…
View article: Steering self-organisation through confinement
Steering self-organisation through confinement Open
Self-organisation is the spontaneous emergence of spatio-temporal structures\nand patterns from the interaction of smaller individual units. Examples are\nfound across many scales in very different systems and scientific disciplines,\nfrom…
View article: Steering self-organisation through confinement
Steering self-organisation through confinement Open
Self-organisation is the spontaneous emergence of spatio-temporal structures and patterns from the interaction of smaller individual units. Examples are found across many scales in very different systems and scientific disciplines, from ph…