A dielectric study on the relaxation and switching behaviour of liquid crystals confined within a colloidal network

M.C.W. Boxtel, van, M. Wübbenhorst, J. Turnhout, van, C.W.M. Bastiaansen, D.J. Broer

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    Abstract

    The mol. ordering and dynamics of a liq. crystal (LC E7) in the presence of a three-dimensional network of submicron particles have been studied by dielec. relaxation spectroscopy. The field-dependent orientation of the LC was quantified by the director order parameter and modelled by use of a three-phase model. The influence of the colloidal network on the mol. dynamics was assessed from the dielec. spectra, e.g. from the position of relaxation peaks as well as from the strength of the two principal relaxations (a and l). The spectra changed noticeably upon application of an increasing d.c. bias. A redn. of the threshold field was obsd. upon addn. of colloidal particles to the LC. This was assocd. with a switching between two metastable states induced by anchoring on the filler particles. Modelled spectra were found to be in good agreement with the exptl. data. The modeling showed that the confined LC phase is composed of two fractions, viz. an ordered and a disordered one with different mol. mobilities. Furthermore, switching expts. were conducted at various temps. in order to evaluate the impact of the colloidal network on the (temp.-dependent) orientational behavior of the LC mols. For the colloid-filled LC higher conductivities were found, which gave rise to longer switch-off times. [on SciFinder (R)]
    Original languageEnglish
    Pages (from-to)235-249
    JournalLiquid Crystals
    Volume30
    Issue number2
    DOIs
    Publication statusPublished - 2003

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    Liquid Crystals
    Liquid crystals
    liquid crystals
    Colloids
    Fillers
    Switches
    Spectroscopy
    fillers
    metastable state
    Crystals
    colloids
    switches
    conductivity
    thresholds
    spectroscopy
    crystals

    Cite this

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    title = "A dielectric study on the relaxation and switching behaviour of liquid crystals confined within a colloidal network",
    abstract = "The mol. ordering and dynamics of a liq. crystal (LC E7) in the presence of a three-dimensional network of submicron particles have been studied by dielec. relaxation spectroscopy. The field-dependent orientation of the LC was quantified by the director order parameter and modelled by use of a three-phase model. The influence of the colloidal network on the mol. dynamics was assessed from the dielec. spectra, e.g. from the position of relaxation peaks as well as from the strength of the two principal relaxations (a and l). The spectra changed noticeably upon application of an increasing d.c. bias. A redn. of the threshold field was obsd. upon addn. of colloidal particles to the LC. This was assocd. with a switching between two metastable states induced by anchoring on the filler particles. Modelled spectra were found to be in good agreement with the exptl. data. The modeling showed that the confined LC phase is composed of two fractions, viz. an ordered and a disordered one with different mol. mobilities. Furthermore, switching expts. were conducted at various temps. in order to evaluate the impact of the colloidal network on the (temp.-dependent) orientational behavior of the LC mols. For the colloid-filled LC higher conductivities were found, which gave rise to longer switch-off times. [on SciFinder (R)]",
    author = "{Boxtel, van}, M.C.W. and M. W{\"u}bbenhorst and {Turnhout, van}, J. and C.W.M. Bastiaansen and D.J. Broer",
    year = "2003",
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    language = "English",
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    }

    A dielectric study on the relaxation and switching behaviour of liquid crystals confined within a colloidal network. / Boxtel, van, M.C.W.; Wübbenhorst, M.; Turnhout, van, J.; Bastiaansen, C.W.M.; Broer, D.J.

    In: Liquid Crystals, Vol. 30, No. 2, 2003, p. 235-249.

    Research output: Contribution to journalArticleAcademicpeer-review

    TY - JOUR

    T1 - A dielectric study on the relaxation and switching behaviour of liquid crystals confined within a colloidal network

    AU - Boxtel, van, M.C.W.

    AU - Wübbenhorst, M.

    AU - Turnhout, van, J.

    AU - Bastiaansen, C.W.M.

    AU - Broer, D.J.

    PY - 2003

    Y1 - 2003

    N2 - The mol. ordering and dynamics of a liq. crystal (LC E7) in the presence of a three-dimensional network of submicron particles have been studied by dielec. relaxation spectroscopy. The field-dependent orientation of the LC was quantified by the director order parameter and modelled by use of a three-phase model. The influence of the colloidal network on the mol. dynamics was assessed from the dielec. spectra, e.g. from the position of relaxation peaks as well as from the strength of the two principal relaxations (a and l). The spectra changed noticeably upon application of an increasing d.c. bias. A redn. of the threshold field was obsd. upon addn. of colloidal particles to the LC. This was assocd. with a switching between two metastable states induced by anchoring on the filler particles. Modelled spectra were found to be in good agreement with the exptl. data. The modeling showed that the confined LC phase is composed of two fractions, viz. an ordered and a disordered one with different mol. mobilities. Furthermore, switching expts. were conducted at various temps. in order to evaluate the impact of the colloidal network on the (temp.-dependent) orientational behavior of the LC mols. For the colloid-filled LC higher conductivities were found, which gave rise to longer switch-off times. [on SciFinder (R)]

    AB - The mol. ordering and dynamics of a liq. crystal (LC E7) in the presence of a three-dimensional network of submicron particles have been studied by dielec. relaxation spectroscopy. The field-dependent orientation of the LC was quantified by the director order parameter and modelled by use of a three-phase model. The influence of the colloidal network on the mol. dynamics was assessed from the dielec. spectra, e.g. from the position of relaxation peaks as well as from the strength of the two principal relaxations (a and l). The spectra changed noticeably upon application of an increasing d.c. bias. A redn. of the threshold field was obsd. upon addn. of colloidal particles to the LC. This was assocd. with a switching between two metastable states induced by anchoring on the filler particles. Modelled spectra were found to be in good agreement with the exptl. data. The modeling showed that the confined LC phase is composed of two fractions, viz. an ordered and a disordered one with different mol. mobilities. Furthermore, switching expts. were conducted at various temps. in order to evaluate the impact of the colloidal network on the (temp.-dependent) orientational behavior of the LC mols. For the colloid-filled LC higher conductivities were found, which gave rise to longer switch-off times. [on SciFinder (R)]

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