| Tim Sanchez1*, Daniel T. N. Chen1*, Stephen J. DeCamp1*, Michael Heymann1,2 and Zvonimir Dogic1
The study investigates the spontaneous motion in hierarchically assembled active matter, focusing on the assembly of active analogs of conventional polymer gels, liquid crystals, and emulsions from microtubule (MT) bundles. By adding biotin-labeled kinesin fragments and a non-adsorbing polymer (PEG), the researchers create active MT bundles that exhibit internal-driven chaotic flows, hydrodynamic instabilities, and enhanced transport. When confined to emulsion droplets, these bundles form 2D nematic liquid crystals with streaming flows controlled by internally generated fractures and self-healing. The resulting active emulsions display unexpected properties, such as autonomous motility, which are not observed in passive analogues. The study highlights the unique collective behavior of active materials, challenging the development of a theoretical framework for engineering far-from-equilibrium material properties.The study investigates the spontaneous motion in hierarchically assembled active matter, focusing on the assembly of active analogs of conventional polymer gels, liquid crystals, and emulsions from microtubule (MT) bundles. By adding biotin-labeled kinesin fragments and a non-adsorbing polymer (PEG), the researchers create active MT bundles that exhibit internal-driven chaotic flows, hydrodynamic instabilities, and enhanced transport. When confined to emulsion droplets, these bundles form 2D nematic liquid crystals with streaming flows controlled by internally generated fractures and self-healing. The resulting active emulsions display unexpected properties, such as autonomous motility, which are not observed in passive analogues. The study highlights the unique collective behavior of active materials, challenging the development of a theoretical framework for engineering far-from-equilibrium material properties.