Infrared dichroism of gold nanorods controlled using a magnetically addressable mesophase

Slyusarenko, Kostyantyn; Constantin, Doru; Abécassis, Benjamin; Chanéac, Corinne

doi:10.1039/c4tc00318g

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…[10][11][12][13] Various methods were developed to achieve active plasmonic materials made of NPs, e.g. embedding NPs in a stimuli responsive [14][15][16] or stretchable 17 polymer matrix, using reversible aggregation-dispersion process, [18][19][20] gel-sol transition, 21 the Langmuir-Blodgett technique, 22 as well as magnetically 23,24 and electrically 25 addressable mesophases. Mesophases can be also addressed indirectly using the photothermal effect of organosoluble plasmonic gold nanorods.…”

Section: Introductionmentioning

confidence: 99%

Reversible switching of structural and plasmonic properties of liquid-crystalline gold nanoparticle assemblies

et al. 2016

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Hybrid materials built of spherical gold nanoparticles with three different sizes covered with (pro)mesogenic molecules have been prepared. Small-angle X-ray diffraction studies showed that after thermal annealing most of the obtained materials formed long-range ordered assemblies. Variation of the (pro)mesogenic ligand architecture enabled us to achieve a switchable material, which could be reversibly reconfigured between 3D long-range ordered structures with tetragonal and face centred cubic symmetries. This structural reconfiguration induces changes to the plasmonic response of the material. This work demonstrates that it is possible to use LC-based self-assembling phenomena to prepare dynamic materials with structural properties important for the development of active plasmonic metamaterials.

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Section: Introductionmentioning

confidence: 99%

Reversible switching of structural and plasmonic properties of liquid-crystalline gold nanoparticle assemblies

et al. 2016

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Doping of nematic cyanobiphenyl liquid crystals with mesogen-hybridized magnetic nanoparticles

Appel

Nádasi

Reitz

et al. 2017

Phys. Chem. Chem. Phys.

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Magnetic nanoparticles (MNPs) functionalized with (pro-)mesogenic ligands are implemented into a nematic liquid crystal (LC) and studied regarding both colloidal stability and magneto-optical behavior. In this study, the particle surface is specifically engineered to tune the MNP interactions with the LC host. For this purpose, four types of (pro-)mesogenic ligands (ML) are synthesized, which are composed of three structural parts, i.e., a rigid, LC motif (i.e., cyanobiphenyl) and a functional group for nanoparticle binding, both linked via a flexible spacer of different alkyl chain lengths. Electrostatically stabilized CoFeO and γ-FeO nanoparticles with narrow size distribution and sizes below 3 nm are obtained via co-precipitation and subsequently functionalized to yield MNP@ML nanoparticles. Studies on the behaviour of the MNP@ML nanoparticles in the commercial LC host (i.e., 4-pentyl-4'-cyanobiphenyl (5CB)) in the bulk and in thin films in LC test cells, reveal the initial formation of some heterogeneities after transition from the isotropic to the nematic phase. Homogenous MNP@ML-5CB hybrids with long-term, colloidal stability, however, are obtained after magnetic separation of initially formed particle aggregates. In particular, MLs with carboxy groups and high structural flexibility (i.e., long linker lengths) are shown to be well suited to form stable MNP colloids, allowing for high MNP doping levels. As compared to undoped 5CB, the CoFeO@MLx-5CB hybrids show an increased sensitivity to the magnetic field, affecting the Fréedericksz transition. The strongest effect, however, is observed in magnetic and electric fields. The coupling of the ultrasmall, spherical MNPs with the LC director in the magnetic field suggests the formation of LC-induced, anisometric MNP clusters.

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Infrared dichroism of gold nanorods controlled using a magnetically addressable mesophase

Cited by 2 publications

References 21 publications

Reversible switching of structural and plasmonic properties of liquid-crystalline gold nanoparticle assemblies

Reversible switching of structural and plasmonic properties of liquid-crystalline gold nanoparticle assemblies

Doping of nematic cyanobiphenyl liquid crystals with mesogen-hybridized magnetic nanoparticles

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