118 citations · 251 across the 8 of their papers we have counts for
9 papers
Rapid generation of relaxed centimeter-sized drops by capillary auto-ejection
Patric Mueller, Kai Ihrig, Achim Sack +2
Many microgravity experiments require centimeter-sized spherical liquid drops. In drop-tower experiments, only a few seconds of microgravity are available, so the drops must be gen…
Reciprocal swimming in viscoelastic granular hydrogels
Hongyi Xiao, Jing Wang, Achim Sack +2
We experimentally study a scallop-like swimmer with reciprocally flapping wings in a nearly frictionless, cohesive granular medium consisting of hydrogel spheres. Significant locom…
Locomotion of a Scallop-Inspired Swimmer in Granular Matter
Hongyi Xiao, Harol Torres, Achim Sack +1
Understanding swimming in soft yielding media is challenging due to their complex deformation response to the swimmer's motion. We experimentally show that a scallop-inspired swimm…
Granular jamming gripper with integrated suction
Angel Santarossa, Olfa D'Angelo, Achim Sack +1
Granular grippers can manipulate a wide variety of objects, but need to be pressed on the object to conform to it. If the object is placed on unstable ground, e.g., on sand or wate…
Automated tomographic assessment of structural defects of freeze-dried pharmaceuticals
Patric Müller, Achim Sack, Jens Dümler +6
The topology and surface characteristics of lyophilisates significantly impact the stability and reconstitutability of freeze-dried pharmaceuticals. Consequently, visual quality co…
Effect of Particle Size on the Suction Mechanism in Granular Grippers
Angel Santarossa, Olfa D'Angelo, Achim Sack +1
Granular grippers are highly adaptable end-effectors that exploit the reversible jamming transition of granular materials to hold and manipulate objects. Their holding force comes…
Soft particles reinforce robotic grippers: Robotic grippers based on granular jamming of soft particles
Holger Götz, Angel Santarossa, Achim Sack +2
Granular jamming has been identified as a fundamental mechanism for the operation of robotic grippers. In this work, we show, that soft particles like expanded polystyrene beads le…
Energy Dissipation in Driven Granular Matter in the Absence of Gravity
Achim Sack, Michael Heckel, Jonathan E. Kollmer +2
We experimentally investigate the energy dissipation rate in sinusoidally driven boxes which are partly filled by granular material under conditions of weightlessness. We identify…
Movers and shakers: Granular damping in microgravity
Marcus N. Bannerman, Jonathan E. Kollmer, Achim Sack +3
The response of an oscillating granular damper to an initial perturbation is studied using experiments performed in microgravity and granular dynamics mulations. High-speed video a…