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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
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When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Decoupling Ionic and Electronic Pathways in Low-Dimensional Hybrid Conductors.

Yubing Zhou1, Chaoji Chen1, Xin Zhang1

  • 1Department of Materials Science and Engineering , University of Maryland , College Park , Maryland 20742 , United States.

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|October 25, 2019
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We developed a nacre-mimetic graphite-based nanofluidic material using cellulose fibers for rapid cation transport. This structure achieves high ionic conductivity while maintaining ultralow electrical conductivity, ideal for new nanofluidic devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Two-dimensional (2D) layered compounds are increasingly used for nanofluidic ion transport due to ease of fabrication and tunable properties.
  • Developing materials with high ion flux and selectivity is crucial for advanced nanofluidic devices.

Purpose of the Study:

  • To design and fabricate a nacre-mimetic graphite-based nanofluidic structure for efficient ion transport.
  • To investigate the decoupling of ionic and electrical conductivity in a 2D layered material system.
  • To explore the potential of this hybrid material for novel nanofluidic device applications.

Main Methods:

  • Fabrication of a 2D nanofluidic structure using graphite flakes wrapped with nanofibrillated cellulose (NFC).
  • Characterization of ionic and electrical conductivity by tuning the hydration degree of the graphite-NFC composite.
  • Evaluation of material stability in acidic and basic environments.

Main Results:

  • The graphite-NFC structure demonstrated rapid cation transport within confined nanochannels (∼1 nm).
  • Achieved a significant enhancement (nearly 12 times) in ionic conductivity by tuning hydration, reaching 1 × 10⁻³ S/cm.
  • Exhibited ultralow electrical conductivity (≤ 10⁻⁹ S/cm) even at high graphite concentrations (up to 50 wt %).
  • The material showed excellent stability in both acidic and basic conditions.

Conclusions:

  • The nacre-mimetic graphite-NFC hybrid system provides a promising platform for studying nanofluidic ion transport.
  • This strategy effectively decouples ionic and electronic pathways, offering unique properties for device applications.
  • The developed material demonstrates high ionic conductivity and low electrical conductivity, suitable for advanced nanofluidic devices.