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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Alineación de cristales líquidos con superficies isotrópicas con patrones.

B W Lee1, N A Clark

  • 1Department of Physics, Ferroelectric Liquid Crystal Materials Research Center, University of Colorado, Boulder, CO 80309-0390, USA.

Science (New York, N.Y.)
|April 3, 2001
PubMed
Resumen

Los investigadores demuestran cómo las superficies isotrópicas con patrones pueden alinear los cristales líquidos nemáticos (LC). Las líneas de frontera entre regiones con diferentes inclinaciones moleculares crean alineación, lo que permite nuevas tecnologías de superficie de alineación LC.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Física Física es la física de las cosas.
  • Química Química es la química.

Sus antecedentes:

  • Los cristales líquidos nemáticos (LC) se alinean con una inclinación media en las superficies isotrópicas, pero carecen de orientación en el plano.
  • La degeneración azimutal en las LC típicamente impide la alineación en superficies isotrópicas uniformes.

Objetivo del estudio:

  • Investigar si las superficies isotrópicas espacialmente inhomogéneas pueden inducir la alineación de LC a pesar de la degeneración azimutal.
  • Para explorar el potencial de las superficies con patrones para controlar la orientación molecular de LC.

Principales métodos:

  • Análisis teórico basado en la sugerencia de Meyer.
  • Demostración experimental utilizando superficies isotrópicas con patrones con regiones distintas de diferente inclinación media.
  • Caracterización de la alineación de cristales líquidos en los límites entre estas regiones.

Principales resultados:

  • Una línea divisoria entre regiones isotrópicas con diferentes inclinaciones medias alinea efectivamente el cristal líquido.
  • La orientación molecular de la LC localmente sigue estas líneas límite.
  • Las superficies con patrones actúan como un sistema de líneas que guían la alineación molecular de la LC.

Conclusiones:

  • Las superficies isotrópicas con patrones espaciales pueden superar la degeneración azimutal para lograr una alineación controlada de cristales líquidos.
  • Este fenómeno permite el desarrollo de nuevas superficies de alineación de cristales líquidos a través de técnicas de impresión o litografía.
  • Los hallazgos abren vías para aplicaciones avanzadas en pantallas y dispositivos ópticos.