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Related Concept Videos

Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Entropy and Solvation02:05

Entropy and Solvation

The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ ≥ 15); an...
Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
Solvating Effects02:12

Solvating Effects

An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...

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Updated: Jun 4, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

Orientational dynamics for an amphiphilic-solvent solution.

G Heinzelmann1, W Figueiredo, M Girardi

  • 1School of Physics, University of Sydney, New South Wales 2006, Australia. germano@physics.usyd.edu.au

The Journal of Chemical Physics
|February 17, 2011
PubMed
Summary
This summary is machine-generated.

This study used simulations to explore water dynamics around amphiphiles. Water molecules in the first hydration shell exhibit slow dynamics, especially in dense phases, impacting our understanding of biological water.

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Related Experiment Videos

Last Updated: Jun 4, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

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Published on: September 1, 2023

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Area of Science:

  • Computational chemistry
  • Soft matter physics
  • Physical chemistry

Background:

  • Amphiphilic aggregation forms micelles, influencing surrounding water properties.
  • Understanding water dynamics in these solutions is crucial for various applications.

Purpose of the Study:

  • To investigate water's orientational and hydrogen-bonding dynamics within micellar solutions.
  • To study the impact of different solvent phases on water dynamics.

Main Methods:

  • Monte Carlo simulations on a lattice model of amphiphilic aggregation.
  • Utilizing an associating lattice gas model for the aqueous solvent.

Main Results:

  • Water dynamics differ significantly between bulk, first, and second hydration shells.
  • A slow orientational relaxation component appears in the first hydration shell at high densities.
  • Water in the second hydration shell shows dynamics similar to bulk water but slower.

Conclusions:

  • The study reveals distinct water dynamics influenced by micellar structures and solvent phases.
  • Observed slow dynamics in the first hydration shell are consistent with biological water behavior.
  • Solvent phase transitions significantly alter water's orientational relaxation.