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Related Experiment Video

Updated: May 14, 2026

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
09:43

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

The generalized identification of truly interfacial molecules (ITIM) algorithm for nonplanar interfaces.

Marcello Sega1, Sofia S Kantorovich, Pál Jedlovszky

  • 1Tor Vergata University of Rome, via della Ricerca scientifica 1, I-00133 Rome, Italy. sega@roma2.infn.it

The Journal of Chemical Physics
|February 8, 2013
PubMed
Summary

We developed a new algorithm to identify interfacial molecules on complex surfaces. This method improves upon existing techniques by handling arbitrary shapes and providing more accurate molecular and density profiles.

Related Experiment Videos

Last Updated: May 14, 2026

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
09:43

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Area of Science:

  • Computational chemistry
  • Materials science
  • Biophysics

Background:

  • Accurate identification of interfacial molecules is crucial for understanding molecular interactions at surfaces.
  • Existing algorithms like ITIM have limitations in handling arbitrarily shaped interfaces.
  • The α-shapes approach offers a geometric criterion but lacks atomic excluded volume considerations.

Purpose of the Study:

  • To generalize the ITIM algorithm for identifying interfacial molecules on arbitrarily shaped interfaces.
  • To develop a robust method for calculating intrinsic density profiles in complex geometries.
  • To apply the new algorithm to systems like micelles and soot models.

Main Methods:

  • A generalized ITIM algorithm integrating concepts from the α-shapes approach.
  • Incorporation of atomic excluded volume into the interfacial molecule identification.
  • Development of an algorithm for intrinsic density profile calculation in arbitrary geometries.

Main Results:

  • The generalized ITIM algorithm successfully identifies interfacial molecules on complex, non-planar surfaces.
  • Accurate intrinsic orientational order parameters of water were computed around micelles.
  • Solvent-reachable sites were identified in soot model structures.
  • The density profile algorithm resolved smearing artifacts for planar interfaces.

Conclusions:

  • The generalized ITIM algorithm offers a versatile and accurate method for interfacial molecule identification.
  • The new approach enhances the study of molecular behavior at complex interfaces.
  • The developed algorithms provide valuable tools for molecular simulations and materials science applications.