Journal of Physical Chemistry B, volume 113, issue 16, pages 5391-5402

Order and Dynamics Inside H-PDLC Nanodroplets: An ESR Spin Probe Study

Publication typeJournal Article
Publication date2009-03-30
Quartile SCImago
Q1
Quartile WOS
Q3
Impact factor3.3
ISSN15206106, 15205207
Materials Chemistry
Surfaces, Coatings and Films
Physical and Theoretical Chemistry
Abstract
We have performed a detailed study of the order and dynamics of the commercially available BL038 liquid crystal (LC) inside nanosized (50-300 nm) droplets of a reflection-mode holographic-polymer dispersed liquid crystal (H-PDLC) device where LC nanodroplet layers and polymer layers are alternately arranged, forming a diffraction grating. We have determined the configuration of the LC local director and derived a model of the nanodroplet organization inside the layers. To achieve this, we have taken advantage of the high sensitivity of the ESR spin probe technique to study a series of temperatures ranging from the nematic to the isotropic phase of the LC. Using also additional information on the nanodroplet size and shape distribution provided by SEM images of the H-PDLC cross section, the observed director configuration has been modeled as a bidimensional distribution of elongated nanodroplets whose long axis is, on the average, parallel to the layers and whose internal director configuration is a uniaxial quasi-monodomain aligned along the nanodroplet long axis. Interestingly, at room temperature the molecules tend to keep their average orientation even when the layers are perpendicular to the magnetic field, suggesting that the molecular organization is dictated mainly by the confinement. This result might explain, at least in part, (i) the need for switching voltages significantly higher and (ii) the observed faster turn-off times in H-PDLCs compared to standard PDLC devices.

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Bacchiocchi C. et al. Order and Dynamics Inside H-PDLC Nanodroplets: An ESR Spin Probe Study // Journal of Physical Chemistry B. 2009. Vol. 113. No. 16. pp. 5391-5402.
GOST all authors (up to 50) Copy
Bacchiocchi C., Miglioli I., Arcioni A., Vecchi I., Rai K., Fontecchio A., ZANNONI C. Order and Dynamics Inside H-PDLC Nanodroplets: An ESR Spin Probe Study // Journal of Physical Chemistry B. 2009. Vol. 113. No. 16. pp. 5391-5402.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1021/jp8105887
UR - https://doi.org/10.1021%2Fjp8105887
TI - Order and Dynamics Inside H-PDLC Nanodroplets: An ESR Spin Probe Study
T2 - Journal of Physical Chemistry B
AU - Miglioli, Isabella
AU - Vecchi, Ilaria
AU - Rai, Kashma
AU - Fontecchio, Adam
AU - Bacchiocchi, Corrado
AU - Arcioni, Alberto
AU - ZANNONI, CLAUDIO
PY - 2009
DA - 2009/03/30 00:00:00
PB - American Chemical Society (ACS)
SP - 5391-5402
IS - 16
VL - 113
SN - 1520-6106
SN - 1520-5207
ER -
BibTex |
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BibTex Copy
@article{2009_Bacchiocchi
author = {Isabella Miglioli and Ilaria Vecchi and Kashma Rai and Adam Fontecchio and Corrado Bacchiocchi and Alberto Arcioni and CLAUDIO ZANNONI},
title = {Order and Dynamics Inside H-PDLC Nanodroplets: An ESR Spin Probe Study},
journal = {Journal of Physical Chemistry B},
year = {2009},
volume = {113},
publisher = {American Chemical Society (ACS)},
month = {mar},
url = {https://doi.org/10.1021%2Fjp8105887},
number = {16},
pages = {5391--5402},
doi = {10.1021/jp8105887}
}
MLA
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MLA Copy
Bacchiocchi, Corrado, et al. “Order and Dynamics Inside H-PDLC Nanodroplets: An ESR Spin Probe Study.” Journal of Physical Chemistry B, vol. 113, no. 16, Mar. 2009, pp. 5391-5402. https://doi.org/10.1021%2Fjp8105887.
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