Temperature induced surface transitions in liquid crystal tilted homogeneous cells

Moldovan, R.; Frunzǎ, S.; Beica, T.; Tintaru, M.

doi:10.1080/02678299608032042

Cited by 4 publications

(6 citation statements)

References 12 publications

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“…For this liquid crystal, the supposition of strong anchoring predicts decreasing experimental tilt angle for decreasing values of f 1 3 with the temperature obtained in homogeneous cells (MOLDOVAN et al 1996), in opposition with the actual experimental results in hybrid cells.…”

Section: Resultscontrasting

confidence: 85%

“…As a result, the values of &3/k and of Qe = Q2 (strong anchoring) or the two parameters characterising the weak anchoring are obtained. Because the same liquid crystal and the same surface were already studied in homogeneous cells (BARBERI et al;MOLDOVAN et al 1996), the two sets of results are compared and discussed in 0 3.…”

Section: Beicamentioning

confidence: 99%

“…The variation of the anchoring tilt angle received the name of temperature induced surface transitions. MOLDOVAN et al 1995;MOLDOVAN et al 1996). In the present paper, temperature induced surface transitions are studied in hybrid cells for which the anchoring is asymmetrical: one of the cell's surface is treated for planar anchoring, the other is treated for a tilted one.…”

Section: Introductionmentioning

confidence: 99%

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Temperature Induced Surface Transitions in Liquid Crystal Planar‐Tilted Hybrid Cells

Moldovan¹,

Frunzǎ²,

Beica³

et al. 1997

Cryst. Res. Technol.

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Temperature induced surface transitions in liquid crystal hybrid cells with asymmetrical anchoring, planar to one surface and tilted to the other, are experimentally studied. The results are theoretically explained by an elastic theory and the resulting values for the effective splay-bend elastic constant for a given liquid crystal, as well as the parameters characterising the anchoring on the boundary surface with tilted anchoring are compared with data from previous experiments, with good agreement.On ktudie les transitions induites par la surface dans des cellules hybrides aux cristaux liquides avec une orientation mol&ulaire planaire B une des surfaces et inclink B l'autre. Les rbultats sont expliq u b par la th&rie_ d'klasticitb des cristaux liquides. Les valeurs obtenues pour le coefficient d'klasticitk effectif, k13, et pour les parametres que caractkrisent l'ancrage B la surface de la paroi de la cellule B orientation inclink sont en bonne . concordance avec les rbultats expkrimentaux prkckients.

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Section: Resultscontrasting

confidence: 85%

Section: Beicamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature Induced Surface Transitions in Liquid Crystal Planar‐Tilted Hybrid Cells

Moldovan¹,

Frunzǎ²,

Beica³

et al. 1997

Cryst. Res. Technol.

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“…We found that the adsorbed ion desorbs with respect to the surface and activation energy of ion, which is also related to anchoring energy. The anchoring energy of interface varies with the temperature change because the direction of directors of liquid crystal on surface is decided by interaction between nematic liquid crystal and surface free energy [3][4]. Existence of ion impurity can be conjectured through diffusion coefficient which M. Eigen calculated using relaxation method [6].…”

Section: Introductionmentioning

confidence: 99%

“…We made an effort to measure the fixed quantity of ion concentration by measuring the residual DC voltage in LC cell and the surface anchoring energy in PVA cell. To understand the mechanism of image sticking, we studied these adsorption and desorption activation energy [2][3][4][5] and found that the desorption activation energy increases as the surface anchoring energy does, and this relationship is rather universal. This observation led us to a conclusion that smaller anchoring energy is required to reduce the image sticking of LC cells.…”

mentioning

confidence: 99%

P‐205L: Late‐News Poster: The Study of the Correlation between Surface Anchoring Energy and Activation Energy on Patterned Vertical Alignment (PVA) Mode

You

Jung

Choi

et al. 2007

Symp Digest of Tech Papers

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The adsorption and desorption of the ions are closely related to the image sticking of liquid crystal (LC) cells [1]. We made an effort to measure the fixed quantity of ion concentration by measuring the residual DC voltage in LC cell and the surface anchoring energy in PVA cell. To understand the mechanism of image sticking, we studied these adsorption and desorption activation energy [2][3][4][5] and found that the desorption activation energy increases as the surface anchoring energy does, and this relationship is rather universal. This observation led us to a conclusion that smaller anchoring energy is required to reduce the image sticking of LC cells.

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Temperature dependence of the nematic anchoring energy: mean field analysis

Barbero

Zvezdin

2000

Physics Letters A

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In the mean field approximation, we evaluate the temperature dependence of the anchoring energy strength of a nematic liquid crystal in contact with a solid substrate due to thermal fluctuations. Our study is limited to the weak anchoring case, where the microscopic surface energy is small with respect to the mean field energy due to the nematic phase. We assume furthermore that the physical properties of the substrate can be considered temperature independent in the range of the nematic phase. According to the thermodynamical perturbative approach, the macroscopic surface energy is deduced by averaging the microscopic one, with a density matrix containing only the nematic mean field. We show that the thermal renormalization of the anchoring energy coefficients is proportional to the generalized nematic order parameters. Our analysis shows also that the thermal renormalization of the anchoring energy coefficients predicted by means of Landau-like theories is a

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Temperature induced surface transitions in liquid crystal tilted homogeneous cells

Cited by 4 publications

References 12 publications

Temperature Induced Surface Transitions in Liquid Crystal Planar‐Tilted Hybrid Cells

Temperature Induced Surface Transitions in Liquid Crystal Planar‐Tilted Hybrid Cells

P‐205L: Late‐News Poster: The Study of the Correlation between Surface Anchoring Energy and Activation Energy on Patterned Vertical Alignment (PVA) Mode

Temperature dependence of the nematic anchoring energy: mean field analysis

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