Applied projects
Code: L1-2607
Project head: Andraž
Rešetič, PhD
Research organisation:
Researchers:
The development of soft flexible materials with morphing and shape-programmable abilities is essential for technological progress of soft robotics, biomechanics, and flexible electronics. However, morph-on-demand materials remain a rather elusive class of smart materials. Shape-programmable matter capable of transforming between three-dimensional shapes in response to external stimuli such as light, heat, electric and magnetic fields is a class of active materials whose geometry can be controlled for performing tasks beyond the operational scope of conventional machines or robots.
In this project, we are proposing the development of a method to produce a new generation of 3D-printable soft material with anisotropic response. The material will be based on the recently developed polymer dispersed liquid crystal elastomers (PDLCE). Such composite material consists of thermomechanically active liquid single crystal elastomer (LSCE) microparticles, dispersed and oriented in a crosslinked polymer matrix. The particle orientation can be spatially modulated using an external magnetic alignment field over the composite volume, resulting in custom-tailored, temperature responsive shape changes of the specimen. We have recently devised a method of producing a suspension of anisotropically shaped LSCE microparticles with their liquid crystal ordering and consequently, direction of thermomechanical actuation, aligned along the particle’s longer axis. Anisotropically shaped LSCE particles can thus be oriented using simple laminar flow, present during deposition while 3D printing the material. The use of the state-of-the-art robotic hand with a mounted polymer dispensing unit, will enable us to precisely control the imprinted thermomechanical anisotropy, by exploiting the robotic hand’s six degrees of freedom of movement in order to deposit PDLCE voxels at arbitrary angles. The developed 3D printable ink will be used to print a tube capable of peristaltic movement, triggered by consecutive heating and cooling of the specimen via incorporated heating wires or by UV/
microwave irradiation absorbing nanostructures additionally functionalizing the LSCE composite.
The realization of a 3D printed peristaltic tube will demonstrate the applicative advantages of our printing method and of the PDLCE 3D printable ink, by producing a specimen with complex morphing abilities that cannot be achieved by any of the currently developed additive manufacturing technologies.

Project phases and their realization:
- preparation of polydomain LSCE bulk materials (temperature-controlled crosslinking of the mixture of commercially available chemicals);
- preparation of polydomain LSCE bulk materials with deuterium labelled constituents (for characterization purposes);
- synthesis of MoS2 nanotubes by sulphurization of Mo6S4I6 nanowires at 1073 K in a reactive gas composed of 98 vol% Ar, 1 vol % of H2S and 1vol % of H2 for 1h;
- preparation of PDLCE resin by freeze-fracturing of bulk LCE and frozen matrix material in a cryogenic planetary ball mill;
- preparation of PDLCE printable ink by pre-shearing the PDLCE resin using custom-build rotational parallel plates inside a temperature controlled chamber;
- determination of liquid crystal ordering inside deformed PDLCE microparticles of a PDLCE printable ink via quadrupole-perturbed deuteron NMR spectroscopy;
- determination of LSCE microparticles orientational order and its associated order parameter Q in PDLCEs via quadrupole-perturbed deuteron NMR spectroscopy;
- determination of bulk LSCE, matrix elastomer, and PDLCE thermomechanical coefficient λ in a temperature-controlled extensometer;
- preparation of PDLCE composite material and peristaltic tube by fused layer deposition of flow-oriented PDLCE printable ink, deposited by a robotic arm with a mounted polymer dispense unit;
- characterization of peristaltic tube performance by analysis of the flow velocity, pressure and volume of expelled liquids using flow and pressure sensors;
- physical modelling of the PDLCE peristaltic tube performance based on mechanical and thermomechanical properties of the PDLCE material, imprinted spatial alignment of PDLCE microparticles and tube’s geometrical constraints.
Leader: Professor Zdravko Kutnjak, PhD
Leader: Professor Igor Serša, PhD
Leader: Associate Professor Janez Štrancar, PhD
Leader: Professor Igor Serša, PhD
Code: L1-8135
Project name: Biopharmaceuticals: sensor for aggregation of protein particles based on liquid crystals
Project head: Miha Ravnik, PhD
Research organisations:
Code: L2-8180-2
Project name: Domain engineered ferroelectric ceramic layer elements for efficient energy harvesting and energy conversion applications
Project head: Malič Barbara, PhD
Project head within the F5 Department: Zdravko Kutnjak, PhD
Research organisation:
Code: L2-9254
Project name: Prostorsko in časovno oblikovanje laserske svetlobe za minimalno invazivne oftalmološke posege (Slovene)
Project head: Tomaž Požar, PhD
Project head within the F5 Department: Janez Štrancar, PhD
Research organisation:
Industrial Projects
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Leader: Professor Igor Serša, PhD
Leader: Associate Professor Miha Škarabot, PhD
Leader: Assistant Professor Tomaž Apih, PhD
Leader: Professor Igor Muševič, PhD
Leader: Professor Denis Arčon, PhD
Leader: Associate Professor Janez Štrancar, PhD
Code: PR-08945
Code: PR-08672
Duration: 10. 4. 2018–31. 12. 2018
Head of the project: dr. Griša Močnik
Financed by: AEROVIZIJA d.o.o.
Code: PR-08508
Duration: 1. 1. 2018–30. 11. 2020
Head of the project: dr. Igor Muševič
Financed by: AMES d.o.o.
Code: PR-08099-2
Duration: 20. 6. 2017–30. 6. 2018
Head of the project: dr. Vid Bobnar
Financed by: National Nuclear Research Center