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Related Concept Videos

Ions and Ionic Charges03:27

Ions and Ionic Charges

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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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Trends in Lattice Energy: Ion Size and Charge02:54

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Formal Charges02:42

Formal Charges

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In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
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Ion Channels01:19

Ion Channels

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
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Ions as Acids and Bases02:54

Ions as Acids and Bases

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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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How charge frustration causes ion ordering and microphase separation at surfaces.

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Multivalent ions interacting with charged surfaces form complex nanostructures, unlike simple monolayers predicted by classical models. This discovery offers insights into controlling materials synthesis using electric fields.

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Area of Science:

  • Surface Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Ion interactions with charged surfaces are crucial in various scientific fields.
  • The effect of surface charging on interfacial structure and dynamics remains poorly understood.

Purpose of the Study:

  • To investigate the adsorption and precipitation of multivalent ions on mica surfaces.
  • To understand the impact of charge on interfacial nanostructure formation.

Main Methods:

  • Molecularly resolved atomic force microscopy (AFM) was used to study ion adsorption.
  • Monte Carlo simulations were employed to model ion behavior and electrostatic forces.

Main Results:

  • Divalent ions formed continuous hydroxide monolayers, consistent with classical models.
  • Trivalent ions exhibited complex states like ordered networks, cluster arrays, and microphase-separated films.
  • These complex states arise from charge frustration, where electrostatic forces are not fully minimized.

Conclusions:

  • Classical models are insufficient for explaining multivalent ion behavior on charged surfaces.
  • Charge frustration significantly influences nanostructure formation at interfaces.
  • The findings provide general principles for charge-driven nanostructure formation and potential applications in materials synthesis.