Results 21 to 30 of about 3,142,115 (200)

Active Fréedericksz Transition in Active Nematic Droplets

Physical Review X
Active nematic liquid crystals have the remarkable ability to spontaneously deform and flow in the absence of any external driving force. While living materials with orientational order, such as the mitotic spindle, can self-assemble in quiescent active ...
Salman Alam, Bibi Najma, Abhinav Singh, Jeremy Laprade, Gauri Gajeshwar, Hannah G. Yevick, Aparna Baskaran, Peter J. Foster, Guillaume Duclos   +8 more
doaj   +3 more sources

Integer topological defects offer a methodology to quantify and classify active cell monolayers [PDF]

Nature Communications
Monolayers of confluent elongated cells are frequently considered active nematics, featuring $$\pm \frac{1}{2}$$ ± 1 2 topological defects. In extensile systems, where cells extend further along their long axis, they can accumulate at $$+\frac{1}{2 ...
Zihui Zhao, He Li, Yisong Yao, Yongfeng Zhao, Francesca Serra, Kyogo Kawaguchi, Hepeng Zhang, Masaki Sano   +7 more
doaj   +2 more sources

Topological structure and dynamics of three-dimensional active nematics. [PDF]

Science, 2020
Point-like motile topological defects control the universal dynamics of diverse two-dimensional active nematics ranging from shaken granular rods to cellular monolayers. A comparable understanding in higher dimensions has yet to emerge.
Duclos G, Adkins R, Adkins R, Banerjee D, Peterson MSE, Varghese M, Kolvin I, Baskaran A, Pelcovits RA, Powers TR, Baskaran A, Toschi F, Hagan MF, Streichan SJ, Vitelli V, Beller DA, Dogic Z.   +16 more
europepmc   +3 more sources

A nonequilibrium force can stabilize 2D active nematics [PDF]

Proceedings of the National Academy of Sciences of the United States of America, 2018
Sriram Ramaswamy, Martin Lenz, M Cristina Marchetti   +2 more
exaly   +2 more sources

Defect dynamics in active nematics. [PDF]

Philos Trans A Math Phys Eng Sci, 2014
Topological defects are distinctive signatures of liquid crystals. They profoundly affect the viscoelastic behaviour of the fluid by constraining the orientational structure in a way that inevitably requires global changes not achievable with any set of local deformations.
Giomi L, Bowick MJ, Mishra P, Sknepnek R, Cristina Marchetti M.   +4 more
europepmc   +6 more sources

Active nematic multipoles: Flow responses and the dynamics of defects and colloids

Frontiers in Physics, 2023
We introduce a general description of localised distortions in active nematics using the framework of active nematic multipoles. We give the Stokesian flows for arbitrary multipoles in terms of differentiation of a fundamental flow response and describe ...
Alexander J. H. Houston, Alexander J. H. Houston, Gareth P. Alexander, Gareth P. Alexander   +3 more
doaj   +1 more source

Do Active Nematic Self-Mixing Dynamics Help Growing Bacterial Colonies to Maintain Local Genetic Diversity?

Frontiers in Physics, 2022
Recent studies have shown that packings of cells, both eukaryotic cellular tissues and growing or swarming bacterial colonies, can often be understood as active nematic fluids.
Fabian Jan Schwarzendahl , Fabian Jan Schwarzendahl , Daniel A. Beller , Daniel A. Beller    +3 more
doaj   +1 more source

Vibration induced by active nematics [PDF]

, 2023
Active elements in active nematics can impose forces on immersed bodies and move them accordingly. We numerically investigate the vibrational motion of a cantilever beam placed in active nematics.
Saghatchi, Roozbeh, Yıldız, Mehmet
core   +1 more source

Active nematic emulsions [PDF]

Science Advances, 2018
Droplets of active fluid form a dynamically self-assembled material based on the cross-talk between active and passive defects.
Guillamat, Pau, Kos, Žiga, Hardoüin, Jérôme, Ignés-Mullol, Jordi, Ravnik, Miha, Sagués, Francesc   +5 more
openaire   +4 more sources

Velocity Correlations in an Active Nematic [PDF]

Physical Review Letters, 2013
The flow properties of a continuum model for an active nematic is studied and compared with recent experiments on suspensions of microtubule bundles and molecular motors. The velocity correlation length is found to be independent of the strength of the activity while the characteristic velocity scale increases monotonically as the activity is increased,
Sumesh P. Thampi, Ramin Golestanian, Julia M. Yeomans   +2 more
openaire   +4 more sources