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Related Concept Videos

Physical Properties of Alkanes02:33

Physical Properties of Alkanes

13.8K
Alkanes are nonpolar molecules due to the presence of only carbon and hydrogen atoms. The electronegativity difference between carbon and hydrogen is minimal, and hence alkanes have a zero dipole moment. This leads to the presence of only dispersion forces between the molecules. The strength of dispersion forces is dependent on the surface area of the molecules on which they act. Since the surface area increases with the molecular length for straight-chain alkanes, the dispersion forces also...
13.8K
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

50.3K
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
50.3K
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

14.1K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
14.1K
Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes02:14

Combustion Energy: A Measure of Stability in Alkanes and Cycloalkanes

7.7K
The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
Alkanes undergo combustion in the presence of excess oxygen and high-temperature conditions to give carbon dioxide and water. A combustion reaction is the energy source in natural gas, liquified...
7.7K
Structure and Bonding of Alkenes02:47

Structure and Bonding of Alkenes

20.2K
Olefins, which are unsaturated hydrocarbons containing one or more carbon–carbon double bonds, are broadly divided into alkenes and cycloalkenes. The general chemical formula of an alkene is CnH2n.
Doubly bonded carbons are sp2 hybridized and have a trigonal planar geometry. The double bond is composed of a σ bond formed by the overlap of hybrid orbitals and a π bond produced by the lateral overlap of unhybridized 2p orbitals on both the carbons. Each carbon atom is...
20.2K
Relative Stabilities of Alkenes01:59

Relative Stabilities of Alkenes

15.6K
The relative stability of alkenes can be determined by comparing their heats of hydrogenation. The lower heat of hydrogenation indicates the more stable alkene.  The three main factors determining the relative stability of alkenes are i) the number of substituents attached to the double-bond carbon atoms, ii) hyperconjugation, and iii) the stereochemistry of the double bond.
15.6K

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Related Experiment Video

Updated: Jan 15, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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Single-Parameter Scaling Strategy for Force Field Optimization: A Case Study on Alkane Melting-Point Prediction.

Ayesha Bashir1,2, Chuncheng Li2, Zhaochuan Fan1,2

  • 1School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, P. R. China.

The Journal of Physical Chemistry. B
|October 10, 2025
PubMed
Summary
This summary is machine-generated.

Optimizing molecular force field parameters efficiently is key for accurate simulations. Scaling dihedral force constants (kn) in united-atom models and partial charges in all-atom models effectively refines alkane melting point predictions.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Molecular Dynamics Simulations

Background:

  • Molecular simulations rely heavily on classical force fields for accuracy.
  • Simultaneous optimization of high-dimensional force field parameters is computationally expensive and can compromise transferability.
  • Accurate prediction of thermophysical properties, such as melting points, is crucial for materials design.

Purpose of the Study:

  • To systematically investigate the impact of individual parameter scaling on the prediction accuracy of multiscale force fields for alkane melting points.
  • To identify optimal single-parameter scaling strategies for refining force fields across different atomistic resolutions (all-atom, united-atom, coarse-grained).
  • To establish structure-property relationships between force field parameters and alkane thermophysical behavior.

Main Methods:

  • Evaluated two all-atom (AA), three united-atom (UA), and one coarse-grained (CG) force field models for predicting melting points of linear alkanes (octane, hexadecane, tetracosane).
  • Systematically scaled individual force field parameters (bond, angle, dihedral force constants, Lennard-Jones parameters, partial charges) to assess their effect on melting point predictions.
  • Analyzed the impact of parameter scaling on other liquid properties like density and self-diffusion coefficients.

Main Results:

  • United-atom models showed melting points positively correlated with dihedral force constants (kn) and Lennard-Jones parameters; scaling kn was optimal.
  • All-atom models benefited from partial charge scaling for melting point refinement with minimal impact on liquid properties.
  • Coarse-grained Martini 3 model showed improved predictions via angle force constant scaling (except for C8).
  • Single-parameter scaling (SPS) successfully corrected melting points for tested models, with specific adjustments for each model type (e.g., ~10% kn scaling for TraPPE-UA/PYS, ~50% reduction for OPLS-UA).

Conclusions:

  • Systematic single-parameter scaling (SPS) provides an efficient strategy for rapid refinement of established force fields.
  • Scaling dihedral force constants (kn) in UA models and partial charges in AA models are effective methods for tuning alkane melting points.
  • The study delineates crucial structure-property relationships, guiding future force field development and optimization.