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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Interplay between nematic and cholesteric interactions in self-consistent field theory.

Russell K W Spencer1, Bae-Yeun Ha1, Nima Saeidi2

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Summary
This summary is machine-generated.

This study models chiral-nematic polymers using self-consistent field theory (SCFT). Nematic interactions stabilize the cholesteric phase, influencing phase transitions and revealing an isotropic-nematic-cholesteric triple point.

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Area of Science:

  • Polymer Physics
  • Materials Science
  • Biomolecular Engineering

Background:

  • Chirality is a fundamental property of many biomolecules, such as collagen.
  • Cholesteric (chiral-nematic) liquid crystal phases arise from polymer alignment and positional rotation.
  • Understanding these phases is crucial for biomaterials and advanced materials design.

Purpose of the Study:

  • To develop a self-consistent field theory (SCFT) for chiral-nematic polymers.
  • To investigate the influence of polymer flexibility and segment orientational degrees of freedom.
  • To construct a phase diagram for isotropic, nematic, and cholesteric polymer phases.

Main Methods:

  • Development of a novel self-consistent field theory (SCFT) model.
  • Inclusion of polymer flexibility and orientational degrees of freedom in the theoretical framework.
  • Construction and analysis of a phase diagram based on the SCFT.

Main Results:

  • The SCFT successfully models chiral-nematic polymer behavior.
  • A phase diagram was generated, illustrating stable regions for isotropic, nematic, and cholesteric phases.
  • Nematic interactions were found to stabilize the cholesteric phase, altering transition points.

Conclusions:

  • The theoretical framework accurately predicts phase behavior in chiral-nematic polymers.
  • Nematic interactions play a significant role in stabilizing cholesteric phases.
  • The study identifies an isotropic-nematic-cholesteric triple point, advancing the understanding of liquid crystal phase transitions.