Symmetrically pulsating bubbles swim in an anisotropic fluid by nematodynamics

Kim, Sung-Jo (avtor), Kos, Žiga (avtor), Um, Eujin (avtor), Jeong, Joonwoo (avtor)

Swimming in low-Reynolds-number fluids requires the breaking of timereversal symmetry and centrosymmetry. Microswimmers, often with asymmetric shapes, exhibit nonreciprocal motions or exploit nonequilibrium processes to propel. The role of the surrounding fluid has also attracted attention because viscoelastic, non-Newtonian, and anisotropic properties of fluids matter in propulsion efficiency and navigation. Here, we experimentally demonstrate that anisotropic fluids, nematic liquid crystals (NLC), can make a pulsating spherical bubble swim despite its centrosymmetric shape and timesymmetric motion. The NLC breaks the centrosymmetry by a deformed nematicdirector fieldwithatopologicaldefectaccompanyingthebubble.The nematodynamics renders the nonreciprocity in the pulsation-induced fluid f low. We also report speed enhancement by confinement and the propulsion of another symmetry-broken bubble dressed by a bent disclination. Our experiments and theory propose another possible mechanism of moving bodies in complex fluids by spatiotemporal symmetry breaking.

• Jezik: Angleški jezik
• Ključne besede: hydrodynamics, complex fluids
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Različica publikacije: Objavljena publikacija
• Datum objave: 09.02.2024
• Leto izida: 2024
• Št. strani: 8 str.
• Številčenje: Vol. 15, art. no. ǂ1220
• PID: 20.500.12556/RUL-155036
• UDK: 532.5
• ISSN pri članku: 2041-1723
• DOI: 10.1038/s41467-024-45597-1
• COBISS.SI-ID: 189133059
• Datum objave v RUL: 15.03.2024

Gradivo je del revije

• Naslov: Nature communications
• Skrajšan naslov: Nat. commun.
• Založnik: Springer Nature
• ISSN: 2041-1723
• COBISS.SI-ID: 2315876

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: hidrodinamika, kompleksne tekočine