Direct Ink Writing of a Light‐Responsive Underwater Liquid Crystal Actuator with Atypical Temperature‐Dependent Shape Changes

Puig, Marc del Pozo; Liu, Li; Cunha, Marina Pilz da; Broer, Dirk J.; Schenning, Albert P. H. J.

doi:10.1002/adfm.202005560

Cited by 62 publications

(100 citation statements)

References 41 publications

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“…The LC oligomer was synthesized via a base-catalyzed thiol-acrylate Michael addition reaction of 1–3 as previously reported 44 (Figure 1, the results of the different characterizations of the prepared oligomer may be found in Figures S2–S4 and Tables S1 and S2 in the Supporting Informtation ). The excess acrylate compared to thiol groups resulted in acrylate-terminated oligomers with molecule 2 in the main chain; the azobenzene group is responsible for granting the network light responsivity with its photo-induced trans -to- cis isomerization.…”

Section: Resultsmentioning

confidence: 99%

Patterned Actuators via Direct Ink Writing of Liquid Crystals

Pozo

Sol

Uden

et al. 2021

ACS Appl. Mater. Interfaces

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Soft actuators allowing multifunctional, multishape deformations based on single polymer films or bilayers remain challenging to produce. In this contribution, direct ink writing is used for generating patterned actuators, which are in between single- and bilayer films, with multifunctionality and a plurality of possible shape changes in a single object. The key is to use the controlled deposition of a light-responsive liquid crystal ink with direct ink writing to partially cover a foil at strategic locations. We found patterned films with 40% coverage of the passive substrate by an active material outperformed “standard” fully covered bilayers. By patterning the film as two stripes, a range of motions, including left- and right-handed twisting and bending in orthogonal directions, could be controllably induced in the same actuator. The partial coverage also left space for applying liquid crystal inks with other functionalities, exemplified by fabricating a light-responsive green reflective actuator whose reflection can be switched “on” and “off”. The results presented here serve as a toolbox for the design and fabrication of patterned actuators with dramatically expanded shape deformation and functionality capabilities.

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Section: Resultsmentioning

confidence: 99%

Patterned Actuators via Direct Ink Writing of Liquid Crystals

Pozo

Sol

Uden

et al. 2021

ACS Appl. Mater. Interfaces

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“…Light is also commonly used as sources of energy (light converting to heat) or stimuli (molecule transformation) in the soft actuation. del Pozo et al (2020) presented lighttriggered bending actuators in response to temperature changes via liquid crystal oligomeric ink (Figure 7B). When illuminated at room temperature, the LCE actuator produces motion away from the light source.…”

Section: The Soft Actuators Mimicked Via Stimulus-driven 4d Printingmentioning

confidence: 99%

Plant-Morphing Strategies and Plant-Inspired Soft Actuators Fabricated by Biomimetic Four-Dimensional Printing: A Review

Ren

Li²,

Wang³

et al. 2021

Front. Mater.

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“…[ 38–40 ] In addition, illumination to induce the shape change is often applied. [ 41–44 ] Topics are here to induce bending or to avoid it (homogeneous shrinking) and the use of visible light. [ 41–43,45 ]…”

Section: Liquid Crystalline Polymersmentioning

confidence: 99%

“…[ 41–44 ] Topics are here to induce bending or to avoid it (homogeneous shrinking) and the use of visible light. [ 41–43,45 ]…”

Section: Liquid Crystalline Polymersmentioning

confidence: 99%

LC‐Polymers and Smectic Phases with Special Substructures/Nanophase Segregation

Zentel

2021

Macro Chemistry & Physics

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Liquid crystalline (LC) polymers find still a lot of interest, whereby the focus is—at present—on LC‐elastomers with different phases and their application for mechanical actuation. While the LC‐phases in LC‐polymers can—generally—be well described in analogy to their low molar mass counterparts, some special properties became evident for some systems with smectic phases. They are related to the modulation of the nanophase segregation within the smectic layers and include often the formation of sublayers consisting of poorly compatible parts of the polymer like bulky (=non mesogenic) units, ionic groups, or poorly miscible parts of the main chain (e.g., polysiloxanes). Such a behavior can be found for semiflexible LC‐main chain polymers and for LC‐side chain polymers. Here the authors i) describe polymers for which such a modification of the smectic structure is observed, ii) discuss the origin of the deviation, and iii) describe possible application for the design of functional materials. The formation of the substructures can allow, for example, a mixing of the LC‐polymers with other polymers, which have a good affinity to the second sublayer. It also allows it to separate, to some extent, the network structure from the packing of the mesogens in LC‐polysiloxanes.

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Direct Ink Writing of a Light‐Responsive Underwater Liquid Crystal Actuator with Atypical Temperature‐Dependent Shape Changes

Cited by 62 publications

References 41 publications

Patterned Actuators via Direct Ink Writing of Liquid Crystals

Patterned Actuators via Direct Ink Writing of Liquid Crystals

Plant-Morphing Strategies and Plant-Inspired Soft Actuators Fabricated by Biomimetic Four-Dimensional Printing: A Review

LC‐Polymers and Smectic Phases with Special Substructures/Nanophase Segregation

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