Liquid crystalline magnetic materials

Zadoina, Lacramioara; Lonetti, Barbara; Soulantica, Katerina; Mingotaud, Anne‐Françoise; Respaud, Marc; Chaudret, Bruno; Mauzac, M.

doi:10.1039/b915075g

Cited by 29 publications

(25 citation statements)

References 27 publications

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“…As we already observed in the case of longer nanorods [15], the thermal treatment has considerably improved the nanorods orientation.…”

Section: Magnetic Properties Of the Liquid Crystal Polymer Compositessupporting

confidence: 57%

“…In a previous report [15], we presented a new composite obtained by dispersing preformed metallic cobalt nanorods in a liquid crystal polymer. In another work [16] we presented the results obtained by the in situ synthesis of Co nanoparticles in the same liquid crystal polymer matrix.…”

Section: Open Accessmentioning

confidence: 99%

“…The Boba content in the P41Boba polymer is probably too low to appreciate the effect of the interaction with the nanorods. It must be noted that the curves in the presence of the liquid crystalline polymer are steeper than in the case of an inert matrix (tetracosane) due to some cooperative effects between the mesogen groups and the nanorods [15]. Co).…”

Section: Magnetic Properties Of the Liquid Crystal Polymer Compositesmentioning

confidence: 99%

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In Situ and Ex Situ Syntheses of Magnetic Liquid Crystalline Materials: A Comparison

et al. 2012

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“…As we already observed in the case of longer nanorods [15], the thermal treatment has considerably improved the nanorods orientation.…”

Section: Magnetic Properties Of the Liquid Crystal Polymer Compositessupporting

confidence: 57%

Section: Open Accessmentioning

confidence: 99%

Section: Magnetic Properties Of the Liquid Crystal Polymer Compositesmentioning

confidence: 99%

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In Situ and Ex Situ Syntheses of Magnetic Liquid Crystalline Materials: A Comparison

et al. 2012

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“…Meanwhile, this magnetic field induced actuation still suffers from low efficiency, and the response time needs further improvement in order for this material to be a practical actuator. A possible improvement to this system may rely on anisotropic magnetic nanoparticles which have stronger affinity with the LCE matrix [84].…”

Section: Magnetic Actuationmentioning

confidence: 99%

Nanoparticle-Liquid Crystalline Elastomer Composites

Marshall

Terentjev

2012

Polymers

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Liquid crystalline elastomers (LCEs) exhibit a number of remarkable physical effects, including a uniquely high-stroke reversible mechanical actuation triggered by external stimuli. Fundamentally, all such stimuli affect the degree of liquid crystalline order in the polymer chains cross-linked into an elastic network. Heat and the resulting thermal actuation act by promoting entropic disorder, as does the addition of solvents. Photo-isomerization is another mechanism of actuation, reducing the orientational order by diminishing the fraction of active rod-like mesogenic units, mostly studied for azobenzene derivatives incorporated into the LCE composition. Embedding nanoparticles provides a new, promising strategy to add functionality to LCEs and ultimately enhance their performance as sensors and actuators. The motivation for the combination of nanoparticles with LCEs is to provide better-controlled actuation stimuli, such as electric and magnetic fields, and broad-spectrum light, by selecting and configuring the appropriate nanoparticles in the LCE matrix. Here we give an overview of recent advances in this area with a focus on preparation, physical properties and actuation performance of the resultant nanocomposites.

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“…This proves that the presence of the organized polymer increases the cooperative effects between the nanorods. [11] We showed that Co nanorods self-assemble into rows that further organize in ah exagonal lattice,g iving rise to highly ordered bundled structures within the hybrid materials. [12] We also proved the feasibility of the synthesis of aliquid crystalline network starting from ah ybrid magnetic liquid crystalline polymer.…”

Section: Methodsmentioning

confidence: 99%

Room‐Temperature, Strain‐Tunable Orientation of Magnetization in a Hybrid Ferromagnetic Co Nanorod–Liquid Crystalline Elastomer Nanocomposite

et al. 2015

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Hybrid nanocomposites based on magnetic nanoparticles dispersed in liquid crystalline elastomers are fascinating emerging materials. Their expected strong magneto-elastic coupling may open new applications as actuators, magnetic switches, and for reversible storage of magnetic information. We report here the synthesis of a novel hybrid ferromagnetic liquid crystalline elastomer. In this material, highly anisotropic Co nanorods are aligned through a cross-linking process performed in the presence of an external magnetic field. We obtain a highly anisotropic magnetic material which exhibits remarkable magneto-elastic coupling. The nanorod alignment can be switched at will at room temperature by weak mechanical stress, leading to a change of more than 50 % of the remnant magnetization ratio and of the coercive field.

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Liquid crystalline magnetic materials

Cited by 29 publications

References 27 publications

In Situ and Ex Situ Syntheses of Magnetic Liquid Crystalline Materials: A Comparison

In Situ and Ex Situ Syntheses of Magnetic Liquid Crystalline Materials: A Comparison

Nanoparticle-Liquid Crystalline Elastomer Composites

Room‐Temperature, Strain‐Tunable Orientation of Magnetization in a Hybrid Ferromagnetic Co Nanorod–Liquid Crystalline Elastomer Nanocomposite

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