Exploration of Size Effects in Cylindrical Nematic Samples: A Numerical Simulation and ESR Study

A numerical treatment is developed and implemented to solve the constitutive equations of nematodynamics according to the Leslie-Ericksen formulation for a cylindrical geometry. Nematic director equations in three dimensions are coupled to a Navier Stokes description of the velocity. This model is u...

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Bibliographic Details
Published inMolecular crystals and liquid crystals (Philadelphia, Pa. : 2003) Vol. 372; no. 1; pp. 135 - 143
Main Authors Gomes, Alexandre E., Polimeno, Antonino, Martins, Assis F., Ceola, Stefano, Corvaja, Carlo
Format Journal Article Conference Proceeding
LanguageEnglish
Published Philadelphia, PA Taylor & Francis Group 01.01.2002
Gordon and Breach
Subjects
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Liquid crystals
Liquid crystals: nematic, cholesteric, smectic, discotic, etc
Material form
Physics
Rheology
Structure of solids and liquids; crystallography
Confinement
Rheology
Digital simulation
Molecular dynamics
Magnetic field effects
Experimental study
Liquid crystals
Nematic crystals
Cylindrical shape
Capillary tube
Molecular orientation
Three dimensional flow
Size effect
Stress effects
Molecular reorientation
EPR spectroscopy
Organic compounds
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Summary:A numerical treatment is developed and implemented to solve the constitutive equations of nematodynamics according to the Leslie-Ericksen formulation for a cylindrical geometry. Nematic director equations in three dimensions are coupled to a Navier Stokes description of the velocity. This model is used to study the influence of the sample size for an experimental set-up corresponding to an combined electron spin resonance (ESR) rheological experiment in which the nematic sample is subject to a constant rotational velocity and to an aligning magnetic field perpendicular to the axis of rotation. The results of the simulations are employed to interpret experimental findings for a series of measurements of the ESR signal of tempone- 14 N dissolved in capillaries of different sizes containing the nematic liquid crystal ZLI 1083, with diameters ranging from 0.1 to 0.5 mm.
ISSN:1542-1406
1058-725X
1563-5287
DOI:10.1080/713738171