TY  - JOUR
A1  - Farhan, Muhammad
A1  - Behl, Marc
A1  - Kratz, Karl
A1  - Lendlein, Andreas
T1  - Origami hand for soft robotics driven by thermally controlled polymeric fiber actuators
JF  - MRS communications / a publication of the Materials Research Society
N2  - Active fibers can serve as artificial muscles in robotics or components of smart textiles. Here, we present an origami hand robot, where single fibers control the reversible movement of the fingers. A recovery/contracting force of 0.2 N with a work capacity of 0.175 kJ kg(-1) was observed in crosslinked poly[ethylene-co-(vinyl acetate)] (cPEVA) fibers, which could enable the bending movement of the fingers by contraction upon heating. The reversible opening of the fingers was attributed to a combination of elastic recovery force of the origami structure and crystallization-induced elongation of the fibers upon cooling.
KW  - Robotics
KW  - Polymer
KW  - Fiber
KW  - Actuation
KW  - Shape-memory
Y1  - 2021
U6  - https://doi.org/10.1557/s43579-021-00058-4
SN  - 2159-6859
SN  - 2159-6867
VL  - 11
IS  - 4
SP  - 476
EP  - 482
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Bagdahn, Christian
A1  - Taubert, Andreas
T1  - Ionogel fiber mats - functional materials via electrospinning of PMMA and the ionic liquid bis(1-butyl-3-methyl-imidazolium) Tetrachloridocuprate(II), [Bmim](2)[CuCl4]
JF  - Zeitschrift für Naturforschung : B, Chemical sciences
N2  - Ionogel fiber mats were made by electrospinning poly(methylmethacrylate) (PMMA) and the ionic liquid (IL) bis(1-butyl-3-methyl-imidazolium) tetrachloridocupraten, [Bmim](2)[CuCl4], from acetone. The morphology of the electrospun ionogels strongly depends on the spinning parameters. Dense and uniform fiber mats were only obtained at concentrations of 60 to 70 g of polymer and IL mass combined. Lower concentrations led to a low number of poorly defined fibers. High voltages of 20 to 25 kV led to well-defined and uniform fibers; voltages between 15 and 20 kV again led to less uniform and less dense fibers. At 10 kV and lower, no spinning could be induced. Finally, PMMA fibers electrospun without IL show a less well-defined morphology combining fibers and oblong droplets indicating that the IL has a beneficial effect on the electrospinning process. The resulting materials are prototypes for new functional materials, for example in sterile filtration.
KW  - Ionic Liquid
KW  - Ionogel
KW  - Electrospinning
KW  - Fiber
KW  - Hydrogen Production
KW  - Filtration
Y1  - 2013
U6  - https://doi.org/10.5560/ZNB.2013-3195
SN  - 0932-0776
SN  - 1865-7117
VL  - 68
IS  - 10
SP  - 1163
EP  - 1171
PB  - De Gruyter
CY  - Tübingen
ER  -