Electro-Opto-Mechanical Effects in Swollen Nematic Elastomers

Urayama, Kenji

doi:10.1007/12_2010_107

Cited by 13 publications

(9 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result, crosslinked nematic LC‐polymers cannot be switched in bulk and some tendency for switching can only be observed in highly swollen systems. [ 102,109 ]…”

Section: Lc‐side Chain Polymers With Statistically Incorporated Non Miscible Unitsmentioning

confidence: 99%

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

Zentel

2021

Macro Chemistry & Physics

View full text Add to dashboard Cite

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.

show abstract

“…As a result, crosslinked nematic LC‐polymers cannot be switched in bulk and some tendency for switching can only be observed in highly swollen systems. [ 102,109 ]…”

Section: Lc‐side Chain Polymers With Statistically Incorporated Non Miscible Unitsmentioning

confidence: 99%

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

Zentel

2021

Macro Chemistry & Physics

View full text Add to dashboard Cite

show abstract

“…The swelling procedure described by Chambers et al [36,37] produces LSCE films with integrated external layers of various thicknesses with a volume fraction of carbon nanoparticles ( p ) which is dependent on the initial nanoparticle concentration (c; Figure 1b). The mechanism of swelling/deswelling of both LCEs and LCE composites was the object of several experimental and theoretical investigations [51,52,53,54,55]. Most of them refer to pristine liquid-crystalline elastomers swelled in appropriate low-molecular-mass LCs (LMMLCs) to study different geometrical distortions of the nematic director, electrical deformations, and electro-optical and mechanical properties [51].…”

Section: Lce-based Composites With Carbon Micro- and Nanostructurementioning

confidence: 99%

“…The mechanism of swelling/deswelling of both LCEs and LCE composites was the object of several experimental and theoretical investigations [51,52,53,54,55]. Most of them refer to pristine liquid-crystalline elastomers swelled in appropriate low-molecular-mass LCs (LMMLCs) to study different geometrical distortions of the nematic director, electrical deformations, and electro-optical and mechanical properties [51]. Torsional actuation was studied in hierarchically patterned LCE materials under the effect of chemical vapor in view of applications as chemo-responsive systems [52].…”

Section: Lce-based Composites With Carbon Micro- and Nanostructurementioning

confidence: 99%

Nanostructured Composites Based on Liquid-Crystalline Elastomers

et al. 2018

View full text Add to dashboard Cite

Liquid-crystalline elastomers (LCEs) are the object of many research investigations due to their reversible and controllable shape deformations, and their high potential for use in the field of soft robots and artificial muscles. This review focuses on recent studies about polymer composites based on LCEs and nanomaterials having different chemistry and morphology, with the aim of instilling new physical properties into LCEs. The synthesis, physico-chemical characterization, actuation properties, and applications of LCE-based composites reported in the literature are reviewed. Several cases are discussed: (1) the addition of various carbon nanomaterials to LCEs, from carbon black to carbon nanotubes, to the recent attempts to include graphene layers to enhance the thermo-mechanic properties of LCEs; (2) the use of various types of nanoparticles, such as ferroelectric ceramics, gold nanoparticles, conductive molybdenum-oxide nanowires, and magnetic iron-oxide nanoparticles, to induce electro-actuation, magnetic-actuation, or photo-actuation into the LCE-based composites; (3) the deposition on LCE surfaces of thin layers of conductive materials (i.e., conductive polymers and gold nanolayers) to produce bending actuation by applying on/off voltage cycles or surface-wrinkling phenomena in view of tunable optical applications. Some future perspectives of this field of soft materials conclude the review.

show abstract

“…The order parameter 1 S , 2 S , and S as function of temperature calculated numerically by Eqs. (23) and (24).…”

Section: Phase Transition Under Magnetic Fieldmentioning

confidence: 99%

“…Elastomers are crosslinked polymer chains that have elastic properties and liquid crystals are mesogenic materials that have orientational order properties, so LCE have combination properties of both substances [1,2,3,4,5]. The coupling between strain and alignment of mesogenic unit, and the responsiveness to the external stimuli such as temperature, electric field, magnetic field, UV light, cause the LCEs materials promise to be suitable for construction of actuators and detectors, and for various application, ranging from micro-pump to artificial muscles [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Magnetcic Field on the Phase Transition of Swollen Liquid Crystal Elastomers

Warsono¹,

Nurwantoro²,

Abraha³

2014

Proceedings of the 2014 International Conference on Physics and Its Applications

View full text Add to dashboard Cite

The effect of magnetic fields on the swelling of liquid crystal elastomers (LCE) dissolved in liquid crystal (LC) solvent have been studied. The Flory-Huggins model used to calculate the free energy of an isotropic mixing and the Maier-Saupe model used to calculate the free energy of a nematic mixing. Numerical integration method used to calculate the order parameter and the total free energy of system (consists of : nematic free energy, elastic free energy, isotropic mixing free energy and magnetic free energy) and the calculation results graphed as a function of temperatures for various magnetic fields and as function of magnetic fields for various of temperatures. We find that the magnetic field shifts the transition points towards higher temperatures, increases the energy transition, and induces an isotropic phase to paranematic phase.

show abstract

Electro-Opto-Mechanical Effects in Swollen Nematic Elastomers

Cited by 13 publications

References 43 publications

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

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

Nanostructured Composites Based on Liquid-Crystalline Elastomers

The Effect of Magnetcic Field on the Phase Transition of Swollen Liquid Crystal Elastomers

Contact Info

Product

Resources

About