{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Pal A"],"funding":["Ministero dell?Istruzione, dell?Universit? e della Ricerca","European Research Council","Knut och Alice Wallenbergs Stiftelse"],"pagination":["2558-2568"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC8867904"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["16(2)"],"pubmed_abstract":["An anisotropic colloidal shape in combination with an externally tunable interaction potential results in a plethora of self-assembled structures with potential applications toward the fabrication of smart materials. Here we present our investigation on the influence of an external magnetic field on the self-assembly of hematite-silica core-shell prolate colloids for two aspect ratios ρ = 2.9 and 3.69. Our study shows a rather counterintuitive but interesting phenomenon, where prolate colloids self-assemble into oblate liquid crystalline (LC) phases. With increasing concentration, particles with smaller ρ reveal a sequence of LC phases involving para-nematic, nematic, smectic, and oriented glass phases. The occurrence of a smectic phase for colloidal ellipsoids has been neither predicted nor reported before. Quantitative shape analysis of the particles together with extensive computer simulations indicate that in addition to ρ, a subtle deviation from the ideal ellipsoidal shape dictates the formation of this unusual sequence of field-induced structures. Particles with ρ = 2.9 exhibit a hybrid shape containing features from both spherocylinders and ellipsoids, which make their self-assembly behavior richer than that observed for either of the \"pure\" shapes. The shape of the particles with higher ρ matches closely with the ideal ellipsoids, as a result their phase behavior follows the one expected for a \"pure\" ellipsoidal shape. Using anisotropic building blocks and external fields, our study demonstrates the ramifications of the subtle changes in the particle shape on the field-directed self-assembled structures with externally tunable properties."],"journal":["ACS nano"],"pubmed_title":["Shape Matters in Magnetic-Field-Assisted Assembly of Prolate Colloids."],"pmcid":["PMC8867904"],"funding_grant_id":["ARTICOLO 1","COMMI 314 -337 LEGGE 232/2016","2017Z55KCW","KAW 2014.0052","339678"],"pubmed_authors":["Ito T","De Filippo CA","Schurtenberger P","Pal A","Petukhov AV","De Michele C","Kamal MA"],"additional_accession":[]},"is_claimable":false,"name":"Shape Matters in Magnetic-Field-Assisted Assembly of Prolate Colloids.","description":"An anisotropic colloidal shape in combination with an externally tunable interaction potential results in a plethora of self-assembled structures with potential applications toward the fabrication of smart materials. Here we present our investigation on the influence of an external magnetic field on the self-assembly of hematite-silica core-shell prolate colloids for two aspect ratios ρ = 2.9 and 3.69. Our study shows a rather counterintuitive but interesting phenomenon, where prolate colloids self-assemble into oblate liquid crystalline (LC) phases. With increasing concentration, particles with smaller ρ reveal a sequence of LC phases involving para-nematic, nematic, smectic, and oriented glass phases. The occurrence of a smectic phase for colloidal ellipsoids has been neither predicted nor reported before. Quantitative shape analysis of the particles together with extensive computer simulations indicate that in addition to ρ, a subtle deviation from the ideal ellipsoidal shape dictates the formation of this unusual sequence of field-induced structures. Particles with ρ = 2.9 exhibit a hybrid shape containing features from both spherocylinders and ellipsoids, which make their self-assembly behavior richer than that observed for either of the \"pure\" shapes. The shape of the particles with higher ρ matches closely with the ideal ellipsoids, as a result their phase behavior follows the one expected for a \"pure\" ellipsoidal shape. Using anisotropic building blocks and external fields, our study demonstrates the ramifications of the subtle changes in the particle shape on the field-directed self-assembled structures with externally tunable properties.","dates":{"release":"2022-01-01T00:00:00Z","publication":"2022 Feb","modification":"2025-04-19T20:08:54.89Z","creation":"2025-04-19T20:08:54.89Z"},"accession":"S-EPMC8867904","cross_references":{"pubmed":["35138802"],"doi":["10.1021/acsnano.1c09208"]}}