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2 article(s) from Vergaz, Ricardo

Reorientation of single-wall carbon nanotubes in negative anisotropy liquid crystals by an electric field

Amanda García-García,
Ricardo Vergaz,
José F. Algorri,
Gianluigi Zito,
Teresa Cacace,
Antigone Marino,
José M. Otón and
Morten A. Geday

Beilstein J. Nanotechnol. 2016, 7, 825–833, doi:10.3762/bjnano.7.74

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Figure 1: SWCNT-doped negative LC reorientation hypothesis: the LC remains homogeneously aligned while SWCNTs...

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Figure 2: Linear polarized light direction for Raman measures at V = 0.

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Figure 3: Raman spectra of a SWCNT-doped LC cell (λ = 523 nm). The G and G’-bands are related to SWCNTs. The ...

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Figure 4: Raman spectrum at different driving voltages (0 V, 1.5 V, 2.5 V, 3.5 V and 4.5 V). The microscope i...

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Figure 5: Raman G-band amplitude variation (below) during a driving voltage sequence between 0 and 11V_rms (ab...

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Figure 6: Cell images under microscopic study during a complete off–on–off voltage cycle. Sample surface (a) ...

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Figure 7: Impedance magnitude and phase measurements of (a) undoped and (b) SWCNT-doped LC cells.

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Figure 8: Impedance magnitude and phase variation at different frequencies as a function of applied driving v...

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Figure 9: Raman Intensity evolution of the G’-band and LC peaks with voltage. The SWCNT threshold voltage is ...

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Full Research Paper

Published 08 Jun 2016

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Electrical response of liquid crystal cells doped with multi-walled carbon nanotubes

Amanda García-García,
Ricardo Vergaz,
José F. Algorri,
Xabier Quintana and
José M. Otón

Beilstein J. Nanotechnol. 2015, 6, 396–403, doi:10.3762/bjnano.6.39

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Figure 1: Schematic structure of a positive nematic MWCNTs-doped LC cell (a) without excitation voltage – pla...

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Figure 2: Sketch of frequency (a), resistance (a) and capacity (b, where C_r₁ < C_r₂ < C_r₃) variations in the C...

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Figure 3: Light transmission response of undoped (top) and MWCNT-doped (bottom) cells at 543 nm. The bottom p...

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Figure 4: Cole-Cole plots of the undoped and MWCNTs-doped LC cells at different scales. (a), (b) and (c), imp...

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Figure 5: Impedance of unbiased doped (filled symbols) and undoped (unfilled symbols) samples at different in...

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Figure 6: R₂ average evolution with the driving sequence. The three unbiased averaged measurements are shown ...

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Figure 7: Driving waveform for impedance measurements. V_p is peak voltage.

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Full Research Paper

Published 06 Feb 2015

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