Electrostatic Potential Map
Electrostatic Potential Map - Related Videos
01:16
Electrostatic Boundary Conditions
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2025
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary. The surface integral of an electric field is given by Gauss's law in integral form and is related to...
04:40
Electrostatic Method to Remove Particulate Organic Matter from Soil
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Cited by 1 •
2021
Removing recently deposited and incompletely decomposed plant material from soil samples reduces the influence of temporary seasonal inputs on soil organic carbon measurements. Attraction to an electrostatically charged surface can be used to quickly remove a substantial amount of particulate organic matter.
01:27
Electrostatic Boundary Conditions in Dielectrics
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2023
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through. Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
06:50
Electric Potential
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Electric potential, also known as "voltage", measures the electric potential energy per unit charge. Electric field is a scalar quantity and is fundamental to many electrical effects. Like potential energy, what is physically meaningful is the difference in the electric potential. For example, the spatial variation in the electric potential is related to the electric...
00:52
Potential Energy
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2019
The energy stored by a structure and location of matter in space is called potential energy. For instance, raising a kettlebell changes its spatial location and increases its potential energy. Similarly, a stretched rubber band contains potential energy which, under certain conditions, can be converted into other forms of energy, such as kinetic energy. Chemical bonds that form attractive forces between atoms also contain potential energy, called chemical energy. When a chemical reaction...
FAQs
The colors indicate relative differences in electric potential across the displayed molecular surface, rather than assigning a separate charge to each atom. Regions at opposite ends of the scale reveal where the molecule presents more positive or more negative electrostatic character. Comparing these regions helps identify uneven charge distribution and anticipate how nearby particles may be oriented during an interaction.
A relatively positive region can indicate a site that may attract electron-rich, nucleophilic particles, whereas a relatively negative region can indicate a site that may attract electron-poor, electrophilic particles. These assignments are predictive rather than absolute. Their value comes from locating chemically distinct regions that can guide interpretation of possible reaction sites and molecular recognition patterns.
Overall polarity describes a molecule-wide pattern, but local potential regions show how that pattern is distributed over particular parts of the molecular surface. Two molecules may therefore have related overall polarity while presenting different positive or negative areas to a nearby particle. This local information is especially useful for considering directional interactions, hydrogen bonding, and selective recognition.
The map reflects the combined electrostatic influence of the atomic nuclei and the molecular electron density. Because both contributions are included, the displayed pattern can distinguish regions where the molecule presents different electrostatic environments. Projecting that calculated result onto a molecular surface makes the spatial arrangement easier to compare with likely contact regions in chemical interactions.
Generation begins with the positions of the molecular atomic nuclei and the calculated electron density. The electrostatic potential is then evaluated around the molecule, projected onto a molecular surface, and represented with a color scale. The resulting image should be read by comparing relative regions of positive and negative potential, not by treating the colors as independent structural features.
Positive and negative surface regions can reveal where a molecule may form favorable electrostatic contacts with surrounding particles. In hydrogen-bonding analysis, the pattern helps identify regions involved in complementary interactions. For solvation, it provides a visual basis for considering how the molecule’s charge distribution may influence its interactions with the surrounding solvent environment.
Researchers can use the maps to compare charge-distribution patterns among molecules and assess whether candidate structures present the desired interaction regions. This supports studies of chemical reactivity, intermolecular recognition, and targeted molecular interactions. In chemistry, the maps therefore connect an electronic property, represented spatially, with experimentally relevant questions about how molecules interact.