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Related Concept Videos

Junction Potentials in Galvanic Cells01:21

Junction Potentials in Galvanic Cells

The Nernst equation, derived under the assumption of thermodynamic equilibrium, calculates the electromotive force (emf) as the sum of potential differences at phase boundaries in a reversible cell without a liquid junction. However, in irreversible cells such as the Daniell cell, an additional potential difference named the liquid-junction potential (EJ) arises across the interface of two electrolyte solutions due to different ion diffusion rates. This EJ represents the potential difference...
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Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical Gradient and Channel Proteins: An Overview

An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
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P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
Gap Junctions01:27

Gap Junctions

The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Gap Junctions

Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...

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Molecular Spring Constant Analysis by Biomembrane Force Probe Spectroscopy
08:10

Molecular Spring Constant Analysis by Biomembrane Force Probe Spectroscopy

Published on: November 20, 2021

Exploring local currents in molecular junctions.

Gemma C Solomon1, Carmen Herrmann, Thorsten Hansen

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois, 60208, USA. g-solomon@northwestern.edu

Nature Chemistry
|December 3, 2010
PubMed
Summary
This summary is machine-generated.

Electron transfer in molecules is key to biology and technology. This study reveals that through-space interactions, not just through-bonds, often dominate electron flow, impacting molecular device design.

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Last Updated: Jun 6, 2026

Molecular Spring Constant Analysis by Biomembrane Force Probe Spectroscopy
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Published on: November 20, 2021

Adhesion Frequency Assay for In Situ Kinetics Analysis of Cross-Junctional Molecular Interactions at the Cell-Cell Interface
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Area of Science:

  • Physical Chemistry
  • Molecular Electronics
  • Quantum Chemistry

Background:

  • Electron transfer is fundamental to biological processes and synthetic molecular devices.
  • Molecular bridge structure significantly influences electronic coupling and electron transfer rates.
  • Existing theories provide conceptual and quantitative models for understanding electron transfer.

Purpose of the Study:

  • To provide chemical insight into electron current flow within bridging molecules.
  • To analyze local currents and their contribution to electron transfer.
  • To explore the role of through-space versus through-bond interactions.

Main Methods:

  • Analysis of local electronic currents within bridging molecules.
  • Theoretical modeling of electron transfer through molecular systems.
  • Investigation of electronic coupling influenced by molecular structure.

Main Results:

  • Through-space electronic coupling terms frequently dominate over through-bond terms.
  • Interference effects in electron transfer can be identified by reversals in ring currents.
  • Local current descriptions offer valuable chemical insights into electron flow.

Conclusions:

  • Understanding local currents and through-space effects is crucial for designing efficient molecular electronic devices.
  • Substituent effects can be strategically employed to maximize impact in molecular electronics.
  • This work refines theoretical approaches to electron transfer in molecular systems.