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Related Concept Videos

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Ionic Crystal Structures

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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.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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Wood's structural properties derive from fibers aligned along the tree's length, contributing significantly to its mechanical strength. Wood exhibits up to twenty times greater tensile strength along these fibers compared to across them, and generally shows better performance under compression than tension. The length of fibers varies, with hardwoods having fibers around one twenty-fifth inch long and softwoods ranging from one-eighth to one-third inch.
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Introduction:
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Structural correlations tailor conductive properties in polymerized ionic liquids.

Benjamin Doughty1, Anne-Caroline Genix2, Ivan Popov1

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The size of mobile anions significantly impacts polymer chain packing in polymerized ionic liquids (PolyILs), affecting their conductivity. Understanding this structure-conductivity relationship is key for developing advanced electrochemical devices.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Chemistry

Background:

  • Polymerized ionic liquids (PolyILs) offer potential as single-ion conductors for electrochemical devices.
  • Low room temperature conductivity in PolyILs necessitates understanding structure-property relationships.

Purpose of the Study:

  • To investigate how molecular structure, specifically mobile anion size, influences the bulk and interfacial structure of PolyILs.
  • To correlate the structural characteristics of PolyILs with their ionic conductivity and dynamics.

Main Methods:

  • Wide-angle X-ray scattering (WAXS) for structural analysis.
  • Vibrational sum frequency generation (vSFG) for interfacial structure.
  • Density functional theory (DFT) for computational modeling.
  • Broadband dielectric spectroscopy (BDS) for dynamics and conductivity.

Main Results:

  • Mobile anion size dramatically affects PolyIL chain packing: larger anions promote packing, while smaller ones hinder it.
  • The extent of structural changes and heterogeneity depends on PolyIL chemistry and flexibility.
  • Structural heterogeneity correlates with reduced activation energy for ionic conductivity in the glassy state.

Conclusions:

  • Mobile anion size is a critical, previously overlooked factor governing PolyIL structure and conductivity.
  • Tailoring PolyIL structure through anion size and polymer backbone offers a pathway to enhance ionic conductivity.
  • Findings provide fundamental insights for designing next-generation electrolytes for batteries and fuel cells.