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Related Concept Videos

Trends in Lattice Energy: Ion Size and Charge02:54

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Aqueous Solutions and Heats of Hydration02:42

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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Layered Alginate Constructs: A Platform for Co-culture of Heterogeneous Cell Populations
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A lattice model for thermally-sensitive core-shell hydrogels.

Cheng Lian1, Dongyan Zhi, Shouhong Xu

  • 1Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China.

Journal of Colloid and Interface Science
|July 6, 2013
PubMed
Summary
This summary is machine-generated.

A new thermodynamic model accurately predicts the swelling behavior of thermally-sensitive core-shell hydrogels. This model, using lattice and chain theories, offers insights into complex hydrogel systems.

Keywords:
Core–shell hydrogelMolecular thermodynamic modelSwelling behaviorThermally-sensitive

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Thermodynamics

Background:

  • Thermally-sensitive hydrogels exhibit significant volume changes with temperature.
  • Core-shell hydrogel architectures offer tunable properties for advanced applications.
  • Predicting hydrogel swelling behavior is crucial for their design and utilization.

Purpose of the Study:

  • To develop a lattice molecular thermodynamic model for describing hydrogel swelling.
  • To analyze the swelling behavior of specific core-shell hydrogel systems.
  • To validate the model's predictive capability against experimental data.

Main Methods:

  • Integration of a close-packed lattice model for mixing free energy.
  • Incorporation of a Flory Gaussian chain model for elastic free energy.
  • Characterization of the model using temperature-dependent exchange energy (ε) and topology-dependent size (V(*)) parameters.

Main Results:

  • The model successfully describes the swelling behavior of doubly thermally-sensitive core-shell hydrogels.
  • The model accurately predicts swelling for hydrogels with a thermally-sensitive shell and a hard core.
  • Calculated results showed good agreement with experimental data for both systems.

Conclusions:

  • The developed lattice molecular thermodynamic model provides a robust framework for understanding hydrogel swelling.
  • The model's parameters can be determined from experimental data of pure polymer hydrogels.
  • This approach facilitates the design and optimization of advanced core-shell hydrogel materials.