4D Printing of Liquid Crystals: What's Right for Me?

@article{delPozo20214DPO,
  title={4D Printing of Liquid Crystals: What's Right for Me?},
  author={Marc del Pozo and Jeroen A. H. P. Sol and Albertus P.H.J. Schenning and Michael G. Debije},
  journal={Advanced Materials},
  year={2021},
  volume={34}
}
Recent years have seen major advances in the developments of both additive manufacturing concepts and responsive materials. When combined as 4D printing, the process can lead to functional materials and devices for use in health, energy generation, sensing, and soft robots. Among responsive materials, liquid crystals, which can deliver programmed, reversible, rapid responses in both air and underwater, are a prime contender for additive manufacturing, given their ease of use and adaptability to… 
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References

SHOWING 1-10 OF 270 REFERENCES
4D Printing at the Microscale
3D printing of adaptive and dynamic structures, also known as 4D printing, is one of the key challenges in contemporary materials science. The additional dimension refers to the ability of 3D printed
Chemistry from 3D printed objects
Abstract3D printing technology has started to take hold as an enabling tool for scientific advancement. Born from the marriage of computer-aided design and additive manufacturing, 3D printing was
4D Printing of Liquid Crystal Elastomer with Controllable Orientation Gradient.
TLDR
This study achieves 4D printing of single component liquid crystal polymer ink in its isotropy state through direct ink writing (DIW) technology and opens up a new prospect to directly print a wide variety of LCE actuators with versatile actuation modes.
High‐Performance Materials for 3D Printing in Chemical Synthesis Applications
TLDR
This work focuses on three highly stable 3D-printable material systems: transparent silicate glasses, ceramics, and fluorinated polymers, and demonstrated that 3D printing is also a versatile technique for surface structuring of polymers to enhance their wetting performance.
4D Printing of a Light-Driven Soft Actuator with Programmed Printing Density
TLDR
This work printed a 3D soft actuator composed of thermoresponsive poly(N-isopropylacrylamide) (PNIPAm) and gold nanorods (AuNRs), which underwent nonequilibrium, programmed, and fast actuation through plasmonic heating by AuNRs, which offered the feasibility of 4D printing toward adaptive bioinspired soft materials.
Advanced Polymer Designs for Direct-Ink-Write 3D Printing.
TLDR
Polymer designs that meet the rheological requirements for direct ink writing are outlined and successful examples are summarized, which include the development of polymer micelles, co-assembled hydrogels, supramolecularly crosslinked systems, polymer liquids with micro-crystalline domains, andhydrogels with dynamic covalent crosslinks.
3D Printing of Liquid Crystal Elastomeric Actuators with Spatially Programed Nematic Order
Liquid crystal elastomers (LCEs) are soft materials capable of large, reversible shape changes, which may find potential application as artificial muscles, soft robots, and dynamic functional
4D Printed Actuators with Soft-Robotic Functions.
TLDR
Using 3D printing, stimuli-responsive liquid crystalline elastomeric structures are created here, offering a new paradigm for active polymer system preparation and overcoming the current limitations of actuation energy available from thin-films.
Rapid High-Resolution Visible Light 3D Printing
TLDR
A versatile and general visible-light-based printing method was shown to afford stiff and soft objects with feature sizes <100 μm, build speeds up to 45 mm/h, and mechanical isotropy, rivaling modern UV-based 3D printing technology and providing a foundation from which bio- and composite-printing can emerge.
Processing advances in liquid crystal elastomers provide a path to biomedical applications.
TLDR
The growth of new processes and strategies opens and strengthens the path for LCEs to be applicable within biomedical device designs, including 4D printing processes that enable the fabrication of LCE actuators capable of replicating the forces generated by human muscles.
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