Van der Waals Interaction Energy between Two Spherical Bodies Calculator

✖Hamaker coefficient A can be defined for a Van der Waals body–body interaction.ⓘ Hamaker Coefficient [A]			+10% -10%
✖Radius of Spherical Body 1 represented as R1.ⓘ Radius of Spherical Body 1 [R₁]			+10% -10%
✖Radius of Spherical Body 2 represented as R1.ⓘ Radius of Spherical Body 2 [R₂]			+10% -10%
✖Center-to-center Distance is a concept for distances, also called on-center spacing, z = R1 + R2 + r.ⓘ Center-to-center Distance [z]			+10% -10%

✖Van der Waals interaction energy include attraction and repulsions between atoms, molecules, and surfaces, as well as other intermolecular forces.ⓘ Van der Waals Interaction Energy between Two Spherical Bodies [U_VWaals]

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Van der Waals Interaction Energy between Two Spherical Bodies Solution

STEP 0: Pre-Calculation Summary

Formula Used

Van der Waals interaction energy = (-(Hamaker Coefficient/6))*(((2*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Center-to-center Distance^2)-((Radius of Spherical Body 1+Radius of Spherical Body 2)^2)))+((2*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Center-to-center Distance^2)-((Radius of Spherical Body 1-Radius of Spherical Body 2)^2)))+ln(((Center-to-center Distance^2)-((Radius of Spherical Body 1+Radius of Spherical Body 2)^2))/((Center-to-center Distance^2)-((Radius of Spherical Body 1-Radius of Spherical Body 2)^2))))
U_VWaals = (-(A/6))*(((2*R₁*R₂)/((z^2)-((R₁+R₂)^2)))+((2*R₁*R₂)/((z^2)-((R₁-R₂)^2)))+ln(((z^2)-((R₁+R₂)^2))/((z^2)-((R₁-R₂)^2))))
This formula uses 1 Functions, 5 Variables

Functions Used

ln - The natural logarithm, also known as the logarithm to the base e, is the inverse function of the natural exponential function., ln(Number)

Variables Used

Van der Waals interaction energy - (Measured in Joule) - Van der Waals interaction energy include attraction and repulsions between atoms, molecules, and surfaces, as well as other intermolecular forces.
Hamaker Coefficient - (Measured in Joule) - Hamaker coefficient A can be defined for a Van der Waals body–body interaction.
Radius of Spherical Body 1 - (Measured in Meter) - Radius of Spherical Body 1 represented as R1.
Radius of Spherical Body 2 - (Measured in Meter) - Radius of Spherical Body 2 represented as R1.
Center-to-center Distance - (Measured in Meter) - Center-to-center Distance is a concept for distances, also called on-center spacing, z = R1 + R2 + r.

STEP 1: Convert Input(s) to Base Unit

Hamaker Coefficient: 100 Joule --> 100 Joule No Conversion Required
Radius of Spherical Body 1: 12 Angstrom --> 1.2E-09 Meter (Check conversion here)
Radius of Spherical Body 2: 15 Angstrom --> 1.5E-09 Meter (Check conversion here)
Center-to-center Distance: 40 Angstrom --> 4E-09 Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

U_VWaals = (-(A/6))*(((2*R₁*R₂)/((z^2)-((R₁+R₂)^2)))+((2*R₁*R₂)/((z^2)-((R₁-R₂)^2)))+ln(((z^2)-((R₁+R₂)^2))/((z^2)-((R₁-R₂)^2)))) --> (-(100/6))*(((2*1.2E-09*1.5E-09)/((4E-09^2)-((1.2E-09+1.5E-09)^2)))+((2*1.2E-09*1.5E-09)/((4E-09^2)-((1.2E-09-1.5E-09)^2)))+ln(((4E-09^2)-((1.2E-09+1.5E-09)^2))/((4E-09^2)-((1.2E-09-1.5E-09)^2))))

Evaluating ... ...

U_VWaals = -0.618579303089315

STEP 3: Convert Result to Output's Unit

-0.618579303089315 Joule --> No Conversion Required

FINAL ANSWER

-0.618579303089315 ≈ -0.618579 Joule <-- Van der Waals interaction energy

(Calculation completed in 00.004 seconds)

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< Van der Waals Force Calculators

Van der Waals Interaction Energy between Two Spherical Bodies

LaTeX Go Van der Waals interaction energy = (-(Hamaker Coefficient/6))*(((2*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Center-to-center Distance^2)-((Radius of Spherical Body 1+Radius of Spherical Body 2)^2)))+((2*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Center-to-center Distance^2)-((Radius of Spherical Body 1-Radius of Spherical Body 2)^2)))+ln(((Center-to-center Distance^2)-((Radius of Spherical Body 1+Radius of Spherical Body 2)^2))/((Center-to-center Distance^2)-((Radius of Spherical Body 1-Radius of Spherical Body 2)^2))))

Potential Energy in Limit of Closest-Approach

LaTeX Go Potential Energy In Limit = (-Hamaker Coefficient*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Radius of Spherical Body 1+Radius of Spherical Body 2)*6*Distance Between Surfaces)

Distance between Surfaces given Potential Energy in Limit of Close-Approach

LaTeX Go Distance Between Surfaces = (-Hamaker Coefficient*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Radius of Spherical Body 1+Radius of Spherical Body 2)*6*Potential Energy)

Radius of Spherical Body 1 given Potential Energy in Limit of Closest-Approach

LaTeX Go Radius of Spherical Body 1 = 1/((-Hamaker Coefficient/(Potential Energy*6*Distance Between Surfaces))-(1/Radius of Spherical Body 2))

Van der Waals Interaction Energy between Two Spherical Bodies Formula

LaTeX Go

What are main characteristics of Van der Waals forces?

1) They are weaker than normal covalent and ionic bonds.
2) Van der Waals forces are additive and cannot be saturated.
3) They have no directional characteristic.
4) They are all short-range forces and hence only interactions between the nearest particles need to be considered (instead of all the particles). Van der Waals attraction is greater if the molecules are closer.
5) Van der Waals forces are independent of temperature except for dipole – dipole interactions.

How to Calculate Van der Waals Interaction Energy between Two Spherical Bodies?

Van der Waals Interaction Energy between Two Spherical Bodies calculator uses Van der Waals interaction energy = (-(Hamaker Coefficient/6))*(((2*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Center-to-center Distance^2)-((Radius of Spherical Body 1+Radius of Spherical Body 2)^2)))+((2*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Center-to-center Distance^2)-((Radius of Spherical Body 1-Radius of Spherical Body 2)^2)))+ln(((Center-to-center Distance^2)-((Radius of Spherical Body 1+Radius of Spherical Body 2)^2))/((Center-to-center Distance^2)-((Radius of Spherical Body 1-Radius of Spherical Body 2)^2)))) to calculate the Van der Waals interaction energy, The Van der Waals interaction energy between two spherical bodies of radii R1 and R2 and with smooth surfaces was approximated in 1937 by Hamaker (using London's famous 1937 equation for the dispersion interaction energy between atoms/molecules as the starting point). Van der Waals interaction energy is denoted by U_VWaals symbol.

How to calculate Van der Waals Interaction Energy between Two Spherical Bodies using this online calculator? To use this online calculator for Van der Waals Interaction Energy between Two Spherical Bodies, enter Hamaker Coefficient (A), Radius of Spherical Body 1 (R₁), Radius of Spherical Body 2 (R₂) & Center-to-center Distance (z) and hit the calculate button. Here is how the Van der Waals Interaction Energy between Two Spherical Bodies calculation can be explained with given input values -> -0.618579 = (-(100/6))*(((2*1.2E-09*1.5E-09)/((4E-09^2)-((1.2E-09+1.5E-09)^2)))+((2*1.2E-09*1.5E-09)/((4E-09^2)-((1.2E-09-1.5E-09)^2)))+ln(((4E-09^2)-((1.2E-09+1.5E-09)^2))/((4E-09^2)-((1.2E-09-1.5E-09)^2)))).

FAQ

What is Van der Waals Interaction Energy between Two Spherical Bodies?

The Van der Waals interaction energy between two spherical bodies of radii R1 and R2 and with smooth surfaces was approximated in 1937 by Hamaker (using London's famous 1937 equation for the dispersion interaction energy between atoms/molecules as the starting point) and is represented as U_VWaals = (-(A/6))*(((2*R₁*R₂)/((z^2)-((R₁+R₂)^2)))+((2*R₁*R₂)/((z^2)-((R₁-R₂)^2)))+ln(((z^2)-((R₁+R₂)^2))/((z^2)-((R₁-R₂)^2)))) or Van der Waals interaction energy = (-(Hamaker Coefficient/6))*(((2*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Center-to-center Distance^2)-((Radius of Spherical Body 1+Radius of Spherical Body 2)^2)))+((2*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Center-to-center Distance^2)-((Radius of Spherical Body 1-Radius of Spherical Body 2)^2)))+ln(((Center-to-center Distance^2)-((Radius of Spherical Body 1+Radius of Spherical Body 2)^2))/((Center-to-center Distance^2)-((Radius of Spherical Body 1-Radius of Spherical Body 2)^2)))). Hamaker coefficient A can be defined for a Van der Waals body–body interaction, Radius of Spherical Body 1 represented as R1, Radius of Spherical Body 2 represented as R1 & Center-to-center Distance is a concept for distances, also called on-center spacing, z = R1 + R2 + r.

How to calculate Van der Waals Interaction Energy between Two Spherical Bodies?

The Van der Waals interaction energy between two spherical bodies of radii R1 and R2 and with smooth surfaces was approximated in 1937 by Hamaker (using London's famous 1937 equation for the dispersion interaction energy between atoms/molecules as the starting point) is calculated using Van der Waals interaction energy = (-(Hamaker Coefficient/6))*(((2*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Center-to-center Distance^2)-((Radius of Spherical Body 1+Radius of Spherical Body 2)^2)))+((2*Radius of Spherical Body 1*Radius of Spherical Body 2)/((Center-to-center Distance^2)-((Radius of Spherical Body 1-Radius of Spherical Body 2)^2)))+ln(((Center-to-center Distance^2)-((Radius of Spherical Body 1+Radius of Spherical Body 2)^2))/((Center-to-center Distance^2)-((Radius of Spherical Body 1-Radius of Spherical Body 2)^2)))). To calculate Van der Waals Interaction Energy between Two Spherical Bodies, you need Hamaker Coefficient (A), Radius of Spherical Body 1 (R₁), Radius of Spherical Body 2 (R₂) & Center-to-center Distance (z). With our tool, you need to enter the respective value for Hamaker Coefficient, Radius of Spherical Body 1, Radius of Spherical Body 2 & Center-to-center Distance and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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