Structure and dynamics of dense colloidal ellipsoids at the nearest-neighbor length scale

Anisotropic particles are known to exhibit a richer and more complex phase behavior in comparison their spherical counterpart. While the majority of existing studies address structural properties, dynamic anisotropic is relatively lesser explored avenue. Using multispeckle ultra-small-angle x-ray photon correlation spectroscopy (USA-XPCS), we have carried out systematic investigation properties colloidal ellipsoids at nearest-neighbor length scale. The USA-XPCS measurements allowed us probe, as function volume fraction, q-dependent effective structure factor, Seff(q), along with long time diffusion coefficient, Deff(q), for this system. Our results indicate scaling Deff(q) 1/Seff(q) from which estimated amplitude Aeff(q), can be directly related hydrodynamic Heff(q). Aeff(q) shows similar q dependence that S(q). also allows precise determination fraction corresponding arrest transition.Received 23 February 2021Accepted 24 May 2021DOI:https://doi.org/10.1103/PhysRevResearch.3.023254Published by American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution work must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasDiffusionPhysical SystemsCharged colloidsColloidal glassTechniquesX-ray spectroscopyX-ray scatteringPolymers & Soft Matter