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Dehydration Synthesis

Dehydration Synthesis

Overview
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...

Ionic Radii

Ionic Radii

Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...

Ionic Bonds

Ionic Bonds

Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...

Molecular and Ionic Solids

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

Solubility of Ionic Compounds

Solubility of Ionic Compounds

Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.

Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

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Related Experiment Video

Updated: Jan 26, 2026

Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM

Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM

Published on: December 31, 2012

Dehydration impeding ionic conductance through two-dimensional angstrom-scale slits.

YanZi Yu¹, JingCun Fan, Jun Xia

¹CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, CAS Center for Excellence in Complex System Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, China. wangfc@ustc.edu.cn.

|April 16, 2019

Summary

Ion transport in nanochannels is crucial for environmental and biological processes. Molecular dynamics simulations reveal dehydration at angstrom-scale slits impedes ion flow, offering insights for water filtration.

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Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM

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Area of Science:

Physical Chemistry
Nanotechnology
Computational Science

Background:

Ion transport in nanochannels is vital for understanding environmental, biological, and chemical processes.
Angstrom-scale nanochannels present unique challenges and opportunities for studying ion behavior.

Purpose of the Study:

Investigate ion transport through two-dimensional slits with angstrom-scale heights.
Decouple size exclusion effects from other mechanisms in confined geometries.
Connect energy barriers for ion permeation to partial dehydration processes.

Main Methods:

Utilized molecular dynamics simulations to model ion transport.
Created realistic angstrom-scale slit geometries for direct experimental comparison.
Developed and validated a theoretical model for ion permeation energy barriers.

Main Results:

Observed significant impedance of ionic conductance due to dehydration at the nanochannel entry.
Demonstrated complete ion rejection at ultimate slit scales.
Established a theoretical link between partial dehydration and ion permeation energy barriers.

Conclusions:

Atomistic details of ion permeation in angstrom-scale slits are elucidated.
Findings provide fundamental insights into ion transport mechanisms.
Results may inform the development of advanced water filtration and desalination technologies.