Eric R. Weeks
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View article: Optimal disk packing of chloroplasts in plant cells
Optimal disk packing of chloroplasts in plant cells Open
Photosynthesis is essential for ecosystem survival, but while plants require light, excessive exposure can damage cells. Chloroplasts, photosynthetic organelles, respond via self-organized motion within cells to optimize light absorption. …
View article: Aging of colloidal gels in microgravity
Aging of colloidal gels in microgravity Open
We study the aging of colloidal gels using light microscopy movies of depletion gels from the International Space Station. Under such microgravity conditions, we observe a slowdown in particle dynamics consistent with gel aging. Stronger a…
View article: Stirring supercooled colloidal liquids at the particle scale
Stirring supercooled colloidal liquids at the particle scale Open
We study the decay of tangential velocity profiles with distance from a local disturbance in hard-sphere colloidal suspensions as the colloidal glass transition is approached. The disturbance, generated by a dimer of superparamagnetic part…
View article: Nonaffine motion in flowing highly polydisperse granular media
Nonaffine motion in flowing highly polydisperse granular media Open
We study the particle-scale motion of highly polydisperse hard disks flowing in a two-dimensional bent channel. We use various size distributions of particles, in which the largest particles are up to five times larger than the smallest. T…
View article: Optimal disk packing of chloroplasts in plant cells
Optimal disk packing of chloroplasts in plant cells Open
Photosynthesis is vital for the survival of entire ecosystems on Earth. While light is fundamental to this process, excessive exposure can be detrimental to plant cells. Chloroplasts, the photosynthetic organelles, actively move in respons…
View article: Physics of Colloids in Space
Physics of Colloids in Space Open
This talk will present recent results from ground-based research to support the Physics of Colloids in Space project which is scheduled to fly in the ISS approximately one year from now. In addition, results supporting future planned fligh…
View article: Flow and clogging of capillary droplets
Flow and clogging of capillary droplets Open
Capillary droplets form due to surface tension when two immiscible fluids are mixed. We describe the motion of gravity-driven capillary droplets flowing through narrow constrictions and obstacle arrays in both simulations and experiments. …
View article: Estimating random close packing density from circle radius distributions
Estimating random close packing density from circle radius distributions Open
Circles of a single size can pack together densely in a hexagonal lattice, but adding in size variety disrupts the order of those packings. We conduct simulations which generate dense random packings of circles with specified size distribu…
View article: Superfluid-tight cryogenic receiver with continuous sub-Kelvin cooling for EXCLAIM
Superfluid-tight cryogenic receiver with continuous sub-Kelvin cooling for EXCLAIM Open
The EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) is a\nballoon-borne telescope designed to survey star formation over cosmological\ntime scales using intensity mapping in the 420 - 540 GHz frequency range.\nEXCLAIM u…
View article: Microstructure of polydisperse colloidal gels
Microstructure of polydisperse colloidal gels Open
We use confocal microscopy to image colloidal gels formed from highly polydisperse particles. We suspend our polydisperse particles in a density matched solvent, and let the particles spontaneously aggregate through the van der Waals force…
View article: Bounded distributions place limits on skewness and larger moments
Bounded distributions place limits on skewness and larger moments Open
Distributions of strictly positive numbers are common and can be characterized by standard statistical measures such as mean, standard deviation, and skewness. We demonstrate that for these distributions the skewness D 3 is bounded from be…
View article: Flow and clogging of capillary droplets
Flow and clogging of capillary droplets Open
We present the deformable particle model that recapitulates capillary droplet structure and dynamics during flows through constrictions. We then show that large droplet deformability causes slow flows and promotes droplet clogging in obsta…
View article: Correction: Flow and clogging of capillary droplets
Correction: Flow and clogging of capillary droplets Open
Correction for ‘Flow and clogging of capillary droplets’ by Yuxuan Cheng et al. , Soft Matter , 2024, https://doi.org/10.1039/D4SM00752B.
View article: Soft matter roadmap<sup>*</sup>
Soft matter roadmap<sup>*</sup> Open
Soft materials are usually defined as materials made of mesoscopic entities, often self-organised, sensitive to thermal fluctuations and to weak perturbations. Archetypal examples are colloids, polymers, amphiphiles, liquid crystals, foams…
View article: Leveraging 3D Bioprinting and Photon‐Counting Computed Tomography to Enable Noninvasive Quantitative Tracking of Multifunctional Tissue Engineered Constructs
Leveraging 3D Bioprinting and Photon‐Counting Computed Tomography to Enable Noninvasive Quantitative Tracking of Multifunctional Tissue Engineered Constructs Open
3D bioprinting is revolutionizing the fields of personalized and precision medicine by enabling the manufacturing of bioartificial implants that recapitulate the structural and functional characteristics of native tissues. However, the lac…
View article: Bounded Distributions place Limits on Skewness and Larger Moments
Bounded Distributions place Limits on Skewness and Larger Moments Open
Distributions of strictly positive numbers are common and can be characterized by standard statistical measures such as mean, standard deviation, and skewness. We demonstrate that for these distributions the skewness $D_3$ is bounded from …
View article: Compression and fracture of ordered and disordered droplet rafts
Compression and fracture of ordered and disordered droplet rafts Open
We simulate a two-dimensional array of droplets being compressed between two walls. The droplets are adhesive due to an attractive depletion force. As one wall moves toward the other, the droplet array is compressed and eventually induced …
View article: Rearrangements during slow compression of a jammed two-dimensional emulsion
Rearrangements during slow compression of a jammed two-dimensional emulsion Open
As amorphous materials get jammed, both geometric and dynamic heterogeneity are observed. We investigate the correlation between the local geometric heterogeneity and local rearrangements in a slowly compressed bidisperse quasi-two-dimensi…
View article: Effect of polydispersity in concentrated magnetorheological fluids
Effect of polydispersity in concentrated magnetorheological fluids Open
Magnetorheological fluids (MRF) are smart materials of increasing interest due to their great versatility in mechanical and mechatronic systems. As main rheological features, MRFs must present low viscosity in the absence of magnetic field…
View article: Isomorphs in sheared binary Lennard-Jones glass: Transient response
Isomorphs in sheared binary Lennard-Jones glass: Transient response Open
We have studied shear deformation of binary Lennard-Jones glasses to investigate the extent to which the transient part of the stress strain curves is invariant when the thermodynamic state point is varied along an isomorph. Shear deformat…
View article: Effect of polydispersity in concentrated magnetorheological fluids
Effect of polydispersity in concentrated magnetorheological fluids Open
Magnetorheological fluids (MRF) are smart materials of increasing interest due to their great versatility in mechanical and mechatronic systems. As main rheological features, MRFs must present low viscosity in the absence of a magnetic fie…
View article: Effects of Polydispersity on the Plastic Behaviors of Dense 2D Granular Systems Under Shear
Effects of Polydispersity on the Plastic Behaviors of Dense 2D Granular Systems Under Shear Open
We study particle-scale motion in sheared highly polydisperse amorphous materials, in which the largest particles are as much as ten times the size of the smallest. We find strikingly different behavior from the more commonly studied amorp…
View article: CCAT-prime: Characterization of the First 280 GHz MKID Array for\n Prime-Cam
CCAT-prime: Characterization of the First 280 GHz MKID Array for\n Prime-Cam Open
The Prime-Cam receiver on the Fred Young Submillimeter Telescope for the\nCCAT-prime project aims to address important astrophysical and cosmological\nquestions with sensitive broadband, polarimetric, and spectroscopic\nmeasurements. The p…
View article: Direct observation of crystal nucleation and growth in a quasi-two-dimensional nonvibrating granular system
Direct observation of crystal nucleation and growth in a quasi-two-dimensional nonvibrating granular system Open
We study a quasi-two-dimensional macroscopic system of magnetic spherical particles settled on a shallow concave dish under a temporally oscillating magnetic field. The system reaches a stationary state where the energy losses from collisi…
View article: Direct observation of crystal nucleation and growth in a quasi-two-dimensional nonvibrating granular system
Direct observation of crystal nucleation and growth in a quasi-two-dimensional nonvibrating granular system Open
We study a quasi-two-dimensional macroscopic system of magnetic spherical particles settled on a shallow concave dish under a temporally oscillating magnetic field. The system reaches a stationary state where the energy losses from collisi…
View article: Details of soft particle clogging in two-dimensional hoppers
Details of soft particle clogging in two-dimensional hoppers Open
We study the outflow of soft particles through quasi-two-dimensional hoppers with both experiments and simulations. The experiments utilize spheres made with soft hydrogel, silicon rubber and glass. The hopper chamber has an adjustable exi…
View article: Rheology finds distinct glass and jamming transitions in emulsions
Rheology finds distinct glass and jamming transitions in emulsions Open
The yield stress for emulsion samples with small droplets shows two transitions, a glass transition at volume fraction 0.58 and a jamming transition at 0.64. For a sample with larger droplets, we only see a jamming transition.