Results 91 to 100 of about 12,892 (173)

Active nematic materials with substrate friction [PDF]

Physical Review E, 2014
Active turbulence in dense active systems is characterized by high vorticity on a length scale that is large compared to that of individual entities. We describe the properties of active turbulence as momentum propagation is screened by frictional damping.
Sumesh P. Thampi, Ramin Golestanian, Julia M. Yeomans   +2 more
openaire   +4 more sources

Continuous generation of topological defects in a passively driven nematic liquid crystal

Nature Communications, 2022
It has been known that spontaneous defect formation and annihilation can be triggered by turbulent flows in active nematic liquid crystals. Here, Mur et al.
Maruša Mur, Žiga Kos, Miha Ravnik, Igor Muševič   +3 more
doaj   +1 more source

Liquid Crystalline Elastomers in Soft Robotics: Assessing Promise and Limitations

Advanced Robotics Research, EarlyView.
Liquid crystalline elastomers (LCEs) are programmable soft materials that undergo large, anisotropic deformation in response to external stimuli. Their molecular alignment encodes directional actuation in a monolithic structure, making them long‐standing candidates for soft robotic systems.
Justin M. Speregen, Timothy J. White
wiley   +1 more source

Active nematics in corrugated channels

Soft Matter
In corrugated channels, active nematics transition from counter-rotating swirls to coherent flows. Swirling structures in the corrugations facilitate slip, lowering the critical activity needed for the transition.
Jaideep P. Vaidya, Tyler N. Shendruk, Sumesh P. Thampi   +2 more
openaire   +3 more sources

Microscopic basis for pattern formation and anomalous transport in two-dimensional active gels

, 2010
Active gels are a class of biologically-relevant material containing embedded agents that spontaneously generate forces acting on a sparse filament network.
Briels, W. J., Gompper, Gerhard, Head, David A.   +2 more
core   +1 more source

Numerical Modeling of Photothermal Self‐Excited Composite Oscillators

Advanced Robotics Research, EarlyView.
We present a numerical framework for simulating photothermal self‐excited oscillations. The driving mechanism is elucidated by highlighting the roles of inertia and overshoot, as well as the phase lag between the thermal moment and the oscillation angle, which together construct the feedback loop between the system state and the environmental stimulus.
Zixiao Liu, Ryan R. Rusch, Zheng Wu, Chi Chen, Pengju Shi, Hao Qiu, Ximin He   +6 more
wiley   +1 more source

Electrically activated ferroelectric nematic microrobots

Nature Communications
AbstractFerroelectric nematic liquid crystals are fluids exhibiting spontaneous electric polarization, which is coupled to their long range orientational order. Due to their inherent property of making bound and surface charges, the free surface of ferroelectric nematics becomes unstable in electric fields.
Marcell Tibor Máthé, Hiroya Nishikawa, Fumito Araoka, Antal Jákli, Péter Salamon   +4 more
openaire   +4 more sources

Strategic Design of Soft Actuators in Translational Medical Robotics for Human‐Centered Healthcare

Advanced Robotics Research, EarlyView.
Soft robotics enables biocompatible, compliant medical devices, but clinical translation requires design‐driven engineering beyond materials. This perspective reviews implantable, surgical, and wearable systems by actuation mechanism, highlighting how optimized architectures and integration improve mechanical interfacing, adaptability, and durability ...
Ho Jun Jin, Jimin Kim, Inho Kim, Bong Hoon Kim   +3 more
wiley   +1 more source

Modeling active nematics via the nematic locking principle

Soft Matter
We model microtubule-based active nematics based on the foundational idea that an initial curve following the director field must continue to follow the director field as it evolves. The resulting model shows improved agreement with experiment.
Kevin A. Mitchell, Md Mainul Hasan Sabbir, Sean Ricarte, Brandon Klein, Daniel A. Beller   +4 more
openaire   +2 more sources

Self-propulsive active nematics [PDF]

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Increasing evidence suggests that active matter exhibits instances of mixed symmetry that cannot be fully described by either polar or nematic formalism. Here, we introduce a minimal model that integrates self-propulsion into the active nematic framework.
Niels de Graaf Sousa, Simon Guldager Andersen, Aleksandra Ardaševa, Amin Doostmohammadi   +3 more
openaire   +2 more sources