Preparation of actuating fibres of oriented main-chain liquid crystalline elastomers by a wetspinning process

Ohm, C. C.; Morys, Michael; Forst, F. Romina; Braun, Lydia; Eremin, Alexey; Serra, Christophe A.; Stannarius, Ralf; Zentel, Rudolf

doi:10.1039/c1sm05111c

Cited by 55 publications

(68 citation statements)

References 29 publications

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“…Films or ribbons of liquid crystal elastomer were used as light driven motors [284] or artificial muscles [285], sheets or disks can respond to light irradiation by bending along any direction, chosen by setting the light polarization [286], or turned into swimmers that move away from a light source [287], and fibers of liquid crystal elastomer showed 'heavy' weight lifting capacity [288]. When a dye-doped short-pitch chiral nematic was turned into a rubber it could be used as a laser with emission wavelength that could be tuned by stretching the rubber [289].…”

Section: Actuators Made From Liquid Crystal Elastomersmentioning

confidence: 99%

A new era for liquid crystal research: Applications of liquid crystals in soft matter nano-, bio- and microtechnology

Lagerwall

Scalia

2012

Current Applied Physics

629

346

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a b s t r a c tLiquid crystals constitute a fascinating class of soft condensed matter characterized by the counterintuitive combination of fluidity and long-range order. Today they are best known for their exceptionally successful application in flat panel displays, but they actually exhibit a plethora of unique and attractive properties that offer tremendous potential for fundamental science as well as innovative applications well beyond the realm of displays. Today this full breadth of the liquid crystalline state of matter is becoming increasingly recognized and numerous new and exciting lines of research are being opened up. We review this exciting development, focusing primarily on the physics aspects of the new research thrusts, in which liquid crystals e thermotropic as well as lyotropic e often meet other types of soft matter, such as polymers and colloidal nano-or microparticle dispersions. Because the field is of large interest also for researchers without a liquid crystal background we begin with a concise introduction to the liquid crystalline state of matter and the key concepts of the research field. We then discuss a selection of promising new directions, starting with liquid crystals for organic electronics, followed by nanotemplating and nanoparticle organization using liquid crystals, liquid crystal colloids (where the liquid crystal can constitute either the continuous phase or the disperse phase, as droplets or shells) and their potential in e.g. photonics and metamaterials, liquid crystal-functionalized polymer fibers, liquid crystal elastomer actuators, ending with a brief overview of activities focusing on liquid crystals in biology, food science and pharmacology.

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Section: Actuators Made From Liquid Crystal Elastomersmentioning

confidence: 99%

A new era for liquid crystal research: Applications of liquid crystals in soft matter nano-, bio- and microtechnology

Lagerwall

Scalia

2012

Current Applied Physics

629

346

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“…Commonly done in a two-step crosslinking process accompanied by mechanical stretching of a film 16 , novel approaches such as micro-and nano-templating 17,18 and inkjet printing techniques 19 recently opened up new possibilities to downscale LCE actuators for micro-sized applications. Ohm et al 20,21 designed a microfluidic set-up that allows a continuous production of micrometre-sized LCE fibres and particles by photopolymerization of an LC monomer to obtain LCEs with customizable actuator geometry and control over the orientation of the director. Although the actuating properties of LCEs have mainly been exploited to simply trigger motion, more sophisticated applications such as peristaltic pumps and selfpropelled robots have been proposed theoretically 22 .…”

mentioning

confidence: 99%

One-piece micropumps from liquid crystalline core-shell particles

et al. 2012

Self Cite

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Responsive polymers are low-cost, light weight and flexible, and thus an attractive class of materials for the integration into micromechanical and lab-on-chip systems. Triggered by external stimuli, liquid crystalline elastomers are able to perform mechanical motion and can be utilized as microactuators. Here we present the fabrication of one-piece micropumps from liquid crystalline core-shell elastomer particles via a microfluidic double-emulsion process, the continuous nature of which enables a low-cost and rapid production. The liquid crystalline elastomer shell contains a liquid core, which is reversibly pumped into and out of the particle by actuation of the liquid crystalline shell in a jellyfish-like motion. The liquid crystalline elastomer shells have the potential to be integrated into a microfluidic system as micropumps that do not require additional components, except passive channel connectors and a trigger for actuation. This renders elaborate and high-cost micromachining techniques, which are otherwise required for obtaining microstructures with pump function, unnecessary.

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“…The photoreactivity and photomechanical effects were enhanced by introduction of a low molecular weight liquid crystal. The complex fiber could be easily applied for mechanical drawing processes, such as wet spinning 20 and electrospinning, 21 because the fibers exhibit a large photomechanical effect and can be prepared from a simple mixture of commercially available (and inexpensive) compounds. Photomobile polymer fibers with hydrogen bonding M Kondo et al…”

Section: Resultsmentioning

confidence: 99%

Photomobile polymers from commercially available compounds: photoinduced deformation of side-chain polymers containing hydrogen-bonded photoreactive compounds

Kondo

Takemoto

Fukae

et al. 2012

Polym J

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Preparation of actuating fibres of oriented main-chain liquid crystalline elastomers by a wetspinning process

Cited by 55 publications

References 29 publications

A new era for liquid crystal research: Applications of liquid crystals in soft matter nano-, bio- and microtechnology

A new era for liquid crystal research: Applications of liquid crystals in soft matter nano-, bio- and microtechnology

One-piece micropumps from liquid crystalline core-shell particles

Photomobile polymers from commercially available compounds: photoinduced deformation of side-chain polymers containing hydrogen-bonded photoreactive compounds

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