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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Ionic Crystal Structures02:42

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Updated: Feb 21, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Smectic phases in ionic liquid crystals.

Hendrik Bartsch1, Markus Bier, S Dietrich

  • 1Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, Germany. Institut für Theoretische Physik IV, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|October 4, 2017
PubMed
Summary
This summary is machine-generated.

Ionic liquid crystals exhibit a novel, wide smectic-A phase at low temperatures. This phase, distinct from typical smectic phases, features larger layer spacing and unique particle orientations.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Ionic liquid crystals (ILCs) merge properties of liquid crystals and ionic liquids.
  • Molecular properties like aspect ratio and charge distribution influence ILC phase behavior.

Purpose of the Study:

  • To investigate the phase behavior of ionic liquid crystals using advanced computational methods.
  • To identify and characterize novel mesophases in ILCs.

Main Methods:

  • Density functional theory calculations.
  • Monte Carlo simulations.

Main Results:

  • Discovery of a novel, wide smectic-A phase (SA) at low temperatures.
  • This new phase exhibits a larger layer spacing compared to the conventional high-temperature smectic-A phase.
  • The novel phase structure involves alternating layers of particles oriented parallel and perpendicular to the layer normal.

Conclusions:

  • The study reveals a new low-temperature smectic-A phase in ionic liquid crystals.
  • This finding expands the understanding of ILC phase complexity and structure-property relationships.