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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...
Dynamic Equilibrium02:20

Dynamic Equilibrium

A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

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

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...
Homogeneous Equilibria for Gaseous Reactions02:15

Homogeneous Equilibria for Gaseous Reactions

Homogeneous Equilibria for Gaseous Reactions
For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. A relation between these two K values may be simply derived from the ideal gas equation and the definition of molarity. According to the ideal gas equation:
Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

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Related Experiment Video

Updated: May 29, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Heterogeneous diffuse interfaces: a new mechanism for arrested coarsening in binary mixtures. Heterogeneous diffuse

R Benzi1, M Bernaschi, M Sbragaglia

  • 1Physics Department, University of Roma, Tor Vergata, via della Ricerca Scientifica, 1, 00133, Roma, Italy.

The European Physical Journal. E, Soft Matter
|September 28, 2011
PubMed
Summary

Binary fluid mixtures with locally negative surface tension exhibit dynamically arrested domain coarsening. This phenomenon, linked to compacton dynamics, offers insights into soft-glassy material behavior.

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Last Updated: May 29, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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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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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

Area of Science:

  • Soft matter physics
  • Fluid dynamics
  • Materials science

Background:

  • Binary fluid mixtures exhibit complex interfacial dynamics.
  • Understanding soft-glassy behavior is crucial for materials science.
  • Traditional models often assume positive surface tension.

Purpose of the Study:

  • To investigate the dynamics of binary fluid mixtures with heterogeneous diffuse interfaces.
  • To explore the role of locally negative surface tension density.
  • To analyze the phenomenon of dynamically arrested domain coarsening.

Main Methods:

  • Numerical simulations using two-dimensional Ginzburg-Landau phase field equations.
  • Incorporation of hydrodynamic motion into the simulations.
  • Analysis of the functional form of surface tension density.

Main Results:

  • Evidence of dynamically arrested domain coarsening was observed.
  • Dynamical arrest was linked to the collective dynamics of compactons.
  • Compactons were identified as metastable, non-linear excitations of the density field.

Conclusions:

  • Heterogeneous diffuse interfaces provide a robust mechanism for soft-glassy behavior.
  • The concept of locally negative surface tension is key to understanding arrested dynamics.
  • Compacton dynamics offer a new framework for interpreting complex fluid behaviors.