Hydrophobic gold nanoparticles via silane conjugation: chemically and thermally robust nanoparticles as dopants for nematic liquid crystals

J. Mirzaei, M. Urbanski, H.-S. Kitzerow, T. Hegmann, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 371 (2013).

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Journal Article | Published | English
Author
Mirzaei, Javad; Urbanski, Martin; Kitzerow, Heinz-SiegfriedLibreCat; Hegmann, Torsten
Abstract
<jats:p> We examine for the first time how chemically and thermally stable gold nanoparticles (NPs), prepared by a silane conjugation approach, affect both the thermal and the electro-optical properties of a nematic liquid crystal (LC), when doped at concentrations ranging from 0.25 to 7.5 wt%. We find that the octadecylsilane-conjugated gold NPs stabilize both the enantiotropic nematic and the monotropic smectic-A phases of the LC host with a maximum stabilization of 2 <jats:sup>°</jats:sup> C for the nematic and 3.5 <jats:sup>°</jats:sup> C for the smectic-A phases for the mixture containing 1 wt% of the silanized particles. The same mixture shows the lowest values for the Fréedericksz transition threshold voltage and the highest value for the dielectric anisotropy. Generally, all NP-containing mixtures, except mixtures with NP concentrations exceeding 5 wt%, reduce the threshold voltage, increase the dielectric anisotropy and reduce both rise and decay time; the latter particularly at temperatures at least 10 <jats:sup>°</jats:sup> C below the isotropic–nematic phase transition on cooling. </jats:p>
Publishing Year
Journal Title
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume
371
Issue
1988
Article Number
20120256
LibreCat-ID

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Mirzaei J, Urbanski M, Kitzerow H-S, Hegmann T. Hydrophobic gold nanoparticles via silane conjugation: chemically and thermally robust nanoparticles as dopants for nematic liquid crystals. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 2013;371(1988). doi:10.1098/rsta.2012.0256
Mirzaei, J., Urbanski, M., Kitzerow, H.-S., & Hegmann, T. (2013). Hydrophobic gold nanoparticles via silane conjugation: chemically and thermally robust nanoparticles as dopants for nematic liquid crystals. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 371(1988), Article 20120256. https://doi.org/10.1098/rsta.2012.0256
@article{Mirzaei_Urbanski_Kitzerow_Hegmann_2013, title={Hydrophobic gold nanoparticles via silane conjugation: chemically and thermally robust nanoparticles as dopants for nematic liquid crystals}, volume={371}, DOI={10.1098/rsta.2012.0256}, number={198820120256}, journal={Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences}, publisher={The Royal Society}, author={Mirzaei, Javad and Urbanski, Martin and Kitzerow, Heinz-Siegfried and Hegmann, Torsten}, year={2013} }
Mirzaei, Javad, Martin Urbanski, Heinz-Siegfried Kitzerow, and Torsten Hegmann. “Hydrophobic Gold Nanoparticles via Silane Conjugation: Chemically and Thermally Robust Nanoparticles as Dopants for Nematic Liquid Crystals.” Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 371, no. 1988 (2013). https://doi.org/10.1098/rsta.2012.0256.
J. Mirzaei, M. Urbanski, H.-S. Kitzerow, and T. Hegmann, “Hydrophobic gold nanoparticles via silane conjugation: chemically and thermally robust nanoparticles as dopants for nematic liquid crystals,” Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, vol. 371, no. 1988, Art. no. 20120256, 2013, doi: 10.1098/rsta.2012.0256.
Mirzaei, Javad, et al. “Hydrophobic Gold Nanoparticles via Silane Conjugation: Chemically and Thermally Robust Nanoparticles as Dopants for Nematic Liquid Crystals.” Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, vol. 371, no. 1988, 20120256, The Royal Society, 2013, doi:10.1098/rsta.2012.0256.

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