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The growth of dynamical heterogeneities, or strong spatial variations in the motion of the constituent particles, is a hallmark feature of slow glassy dynamics. We report here a systematic confocal microscopy study that characterizes the cooperative dynamics of fluorescently\u2010labeled colloidal particles in dense aqueous suspensions. Our experiments demonstrate that jammed particulate suspensions can be fluidized by increasing the width of the particle size distribution. Our molecular dynamics simulations, performed to numerically investigate the effects of continuous\u2010size polydispersity (PD) on dense particle packing dynamics, show qualitative agreement with our experimental studies on the PD\u2010dependence of the observed heterogeneity trends. Besides shedding light on the fundamental aspects of particle\u2010scale dynamics at the jamming\u2013unjamming transition, our findings are significant in the fabrication of commonly\u2010encountered dense suspensions such as paints, cosmetics, and foods.<\/jats:p>","DOI":"10.1002\/cphc.202500010","type":"journal-article","created":{"date-parts":[[2026,4,7]],"date-time":"2026-04-07T19:15:38Z","timestamp":1775589338000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Influence of Particle Size Polydispersity on Dynamical Heterogeneities in Dense Particle Packings"],"prefix":"10.1002","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0657-7367","authenticated-orcid":false,"given":"Rajkumar","family":"Biswas","sequence":"first","affiliation":[{"name":"Soft Condensed Matter Group Raman Research Institute  Bangalore India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anoop","family":"Mutneja","sequence":"additional","affiliation":[{"name":"Tata Institute of Fundamental Research  Hyderabad India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Smarajit","family":"Karmakar","sequence":"additional","affiliation":[{"name":"Tata Institute of Fundamental Research  Hyderabad India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4290-6404","authenticated-orcid":false,"given":"Ranjini","family":"Bandyopadhyay","sequence":"additional","affiliation":[{"name":"Soft Condensed Matter Group Raman Research Institute  Bangalore India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,4,7]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1088\/0034-4885\/55\/3\/001"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.267.5206.1924"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1103\/RevModPhys.83.587"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev-conmatphys-031113-133848"},{"key":"e_1_2_10_6_1","first-page":"306","article-title":"Relationship of Glass Transition Temperature to Viscosity\u2010Temperature Characteristics of Lubricants","volume":"5","author":"Stearns R. 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