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Harnessing Active Fluids to Assemble and Actuate Passive Structures
Harnessing Active Fluids to Assemble and Actuate Passive Structures
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105417
- ISBN
- 9798297662773
- DDC
- 530
- 저자명
- Ray, Sattvic.
- 서명/저자
- Harnessing Active Fluids to Assemble and Actuate Passive Structures
- 발행사항
- [Sl] : University of California, Santa Barbara, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 116 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Dogic, Zvonimir.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Santa Barbara, 2025.
- 초록/해제
- 요약While living systems ubiquitously harness the coupling of active forces to viscoelastic media to robustly generate complex structure and function, translating this paradigm to synthetic materials remains a challenge. In this dissertation, we use two model experimental systems to investigate how active fluid flows can be harnessed to actuate and assemble passive structures. First, we embed rigid inclusions of various shapes in a 2D active nematic film. We investigate the interplay between the inclusion shape, boundary-induced nematic order, and autonomous flows that power the inclusion motion. Specifically, we find that chiral gear-shaped inclusions exhibit long-term rectified rotation, despite the fact that the active nematic flow is chaotic away from the gear. The rectified rotation is correlated with dynamics and polarization of nearby +1/2 topological defects in the vicinity of the chiral gear.Next, we create a system in which a chaotic active fluid assembles and actuates a soft elastic sheet, generating structure and dynamics across multiple length and time scales. Active stresses generated by the microtubule-kinesin fluid act on actin-fascin bundles, driving them to coarsen and percolate into a network. The network contracts vertically in the quasi-2D sample chambers, forming an elastic sheet suspended at the sample midplane that exhibits strain fluctuations driven by the active flows. These local deformations sometimes coarsen into persistent centimeter-scale shear oscillations that span the system size. By tuning the motor concentration of the active fluid or the crosslinker concentration of the passive network, elastic networks with a wide variety of structural and mechanical properties can be assembled. We study the mechanics of actin-fascin networks created with varying amounts of activity, and show that networks created with higher activity appear to be stiffer and more heterogeneous. These experiments, which couple active stresses to rigid and soft structures, demonstrate that chaotic active fluids can transport passive objects in ordered ways and assemble and actuate complex multiscale structures. In each case, these interactions involve a complex feedback between the active and passive components which require further theoretical investigation. These experiments are a preliminary step towards developing microfluidic and material synthesis technologies using active matter.
- 일반주제명
- Condensed matter physics
- 일반주제명
- Biophysics
- 일반주제명
- Automotive engineering
- 키워드
- Active matter
- 키워드
- Polarization
- 키워드
- Autonomous flows
- 기타저자
- University of California, Santa Barbara Physics
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798297662773
■035 ▼a(MiAaPQ)AAI32238524
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aRay, Sattvic.
■24510▼aHarnessing Active Fluids to Assemble and Actuate Passive Structures
■260 ▼a[Sl]▼bUniversity of California, Santa Barbara▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a116 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Dogic, Zvonimir.
■5021 ▼aThesis (Ph.D.)--University of California, Santa Barbara, 2025.
■520 ▼aWhile living systems ubiquitously harness the coupling of active forces to viscoelastic media to robustly generate complex structure and function, translating this paradigm to synthetic materials remains a challenge. In this dissertation, we use two model experimental systems to investigate how active fluid flows can be harnessed to actuate and assemble passive structures. First, we embed rigid inclusions of various shapes in a 2D active nematic film. We investigate the interplay between the inclusion shape, boundary-induced nematic order, and autonomous flows that power the inclusion motion. Specifically, we find that chiral gear-shaped inclusions exhibit long-term rectified rotation, despite the fact that the active nematic flow is chaotic away from the gear. The rectified rotation is correlated with dynamics and polarization of nearby +1/2 topological defects in the vicinity of the chiral gear.Next, we create a system in which a chaotic active fluid assembles and actuates a soft elastic sheet, generating structure and dynamics across multiple length and time scales. Active stresses generated by the microtubule-kinesin fluid act on actin-fascin bundles, driving them to coarsen and percolate into a network. The network contracts vertically in the quasi-2D sample chambers, forming an elastic sheet suspended at the sample midplane that exhibits strain fluctuations driven by the active flows. These local deformations sometimes coarsen into persistent centimeter-scale shear oscillations that span the system size. By tuning the motor concentration of the active fluid or the crosslinker concentration of the passive network, elastic networks with a wide variety of structural and mechanical properties can be assembled. We study the mechanics of actin-fascin networks created with varying amounts of activity, and show that networks created with higher activity appear to be stiffer and more heterogeneous. These experiments, which couple active stresses to rigid and soft structures, demonstrate that chaotic active fluids can transport passive objects in ordered ways and assemble and actuate complex multiscale structures. In each case, these interactions involve a complex feedback between the active and passive components which require further theoretical investigation. These experiments are a preliminary step towards developing microfluidic and material synthesis technologies using active matter.
■590 ▼aSchool code: 0035.
■650 4▼aCondensed matter physics
■650 4▼aBiophysics
■650 4▼aAutomotive engineering
■653 ▼aActive matter
■653 ▼aSynthetic materials
■653 ▼aPolarization
■653 ▼aAutonomous flows
■690 ▼a0611
■690 ▼a0786
■690 ▼a0540
■71020▼aUniversity of California, Santa Barbara▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0035
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360275▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
