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Dynamics of capsules in active nematics

Bibliographic Details
Main Author: Santos, Júlio Palma de Assunção
Publication Date: 2024
Format: Master thesis
Language: eng
Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Download full: http://hdl.handle.net/10400.5/98549
Summary: Tese de mestrado, Física (Física Estatística e Matéria Condensada), 2025, Universidade de Lisboa, Faculdade de Ciências
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spelling Dynamics of capsules in active nematicsnemáticos ativosdinâmica de cápsulasmétodo de lattice Boltzmanndefeitos topológicosturbulência ativaTeses de mestrado - 2025Departamento de FísicaTese de mestrado, Física (Física Estatística e Matéria Condensada), 2025, Universidade de Lisboa, Faculdade de CiênciasThe field of active matter, characterized by particles that utilize environmental energy to self-propel, bridges multiple scientific areas, from biology to physics to engineering [53]. In groups, these inherently out-of-equilibrium systems will show complex collective behaviors that are not understood by the sum of their parts [28][5]. This thesis studies the dynamics of capsules in active nematic systems, using an Immersed-Boundary-Lattice-Boltzmann method (IB-LBM). We explore the impact of the capsule’s shape, size, and flexibility on its dynamics. Additionally, we briefly explore the impact of the substrate friction on the capsule’s dynamics. We found friction to be a deciding factor in the capsule (and tracer) dynamics: for high friction, we observe a long-time diffusive regime; and for low friction, we observe a long-time superdiffusive regime. We focused on the high friction scenario, where we found that the capsule’s size inversely correlates with diffusion rate, with smaller capsules having a faster transport. The shape has an important role, as circular capsules diffuse faster than triangular capsules. Most notably, asymmetric capsules displayed a long-time superdiffusive regime and a strong preferential direction of motion. Flexibility has a significant impact on highly flexible capsules, that adopt finger-like shapes and exhibit a long-time diffusive regime with a slower diffusion and two preferential directions of motion, along the length of the finger-like shape. We concluded that the anomalous transport, in the high friction scenario, was connected to the nematic texture around the capsule, due to the anchoring. In future work, we intend to explore the dynamics further in the high friction scenario, with particular attention to the rotational dynamics. Additionally, we want to study the low friction scenario.Coelho, Rodrigo C.V.Gama, Margarida Telo da, 1956-Repositório da Universidade de LisboaSantos, Júlio Palma de Assunção2025-02-18T18:31:01Z202520242025-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.5/98549enginfo:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-03-17T16:34:26Zoai:repositorio.ulisboa.pt:10400.5/98549Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-29T04:20:30.808711Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Dynamics of capsules in active nematics
title Dynamics of capsules in active nematics
spellingShingle Dynamics of capsules in active nematics
Santos, Júlio Palma de Assunção
nemáticos ativos
dinâmica de cápsulas
método de lattice Boltzmann
defeitos topológicos
turbulência ativa
Teses de mestrado - 2025
Departamento de Física
title_short Dynamics of capsules in active nematics
title_full Dynamics of capsules in active nematics
title_fullStr Dynamics of capsules in active nematics
title_full_unstemmed Dynamics of capsules in active nematics
title_sort Dynamics of capsules in active nematics
author Santos, Júlio Palma de Assunção
author_facet Santos, Júlio Palma de Assunção
author_role author
dc.contributor.none.fl_str_mv Coelho, Rodrigo C.V.
Gama, Margarida Telo da, 1956-
Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Santos, Júlio Palma de Assunção
dc.subject.por.fl_str_mv nemáticos ativos
dinâmica de cápsulas
método de lattice Boltzmann
defeitos topológicos
turbulência ativa
Teses de mestrado - 2025
Departamento de Física
topic nemáticos ativos
dinâmica de cápsulas
método de lattice Boltzmann
defeitos topológicos
turbulência ativa
Teses de mestrado - 2025
Departamento de Física
description Tese de mestrado, Física (Física Estatística e Matéria Condensada), 2025, Universidade de Lisboa, Faculdade de Ciências
publishDate 2024
dc.date.none.fl_str_mv 2024
2025-02-18T18:31:01Z
2025
2025-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/98549
url http://hdl.handle.net/10400.5/98549
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
_version_ 1833602022647005184

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