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Related Concept Videos

Hydration of Cement01:24

Hydration of Cement

960
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
960
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

18.0K
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...
18.0K
Strength and Heat of Hydration01:29

Strength and Heat of Hydration

717
The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
The heat of hydration for each cement compound is significant; for instance, tricalcium aluminate (C3A) and...
717
Acid-Catalyzed Hydration of Alkenes02:45

Acid-Catalyzed Hydration of Alkenes

17.4K
Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.
17.4K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

9.6K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
9.6K
Aldehydes and Ketones with Water: Hydrate Formation01:20

Aldehydes and Ketones with Water: Hydrate Formation

4.9K
An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
4.9K

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Updated: Feb 11, 2026

Methane Hydrate Crystallization on Sessile Water Droplets
08:46

Methane Hydrate Crystallization on Sessile Water Droplets

Published on: May 26, 2021

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[Skin hydration and hydrating products].

H Duplan1, T Nocera2

  • 1Pôle pharmacologie, Pierre-Fabre dermocosmétique, centre R&D Pierre-Fabre, 3, avenue Hubert-Curien, 31035 Toulouse cedex 1, France.

Annales De Dermatologie Et De Venereologie
|April 29, 2018
PubMed
Summary
This summary is machine-generated.

Maintaining skin hydration is crucial for epidermal barrier function and overall skin health. This review synthesizes recent findings on skin hydration regulation and dry skin characterization for improved management.

Keywords:
Barrier functionCutaneous hydrationDry skinFonction barrièreGradient hydriqueHydratation cutanéeHydrating productsHydration gradientMolecular regulationProduits hydratantsRégulation moléculaireStratum corneumSécheresse cutanée

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High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water
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Area of Science:

  • Dermatology
  • Skin Physiology

Background:

  • The skin's epidermal barrier is vital for protection and preventing water loss.
  • Optimal skin hydration is essential for physiological function, impacting visible and molecular parameters.
  • The stratum corneum plays a key role in regulating skin hydration gradients.

Purpose of the Study:

  • To review recent advancements in understanding skin hydration.
  • To discuss the characterization of dehydrated or dry skin.
  • To explore optimized management strategies for dry skin.

Main Methods:

  • Synthesis of recent research data on skin hydration.
  • Analysis of regulatory processes governing skin water balance.
  • Evaluation of evolving in situ measurement techniques for skin hydration.

Main Results:

  • Hydration significantly influences skin suppleness, softness, enzyme activity, and cellular signaling.
  • Sophisticated regulatory processes maintain skin hydration.
  • New techniques enhance the characterization of dry skin.

Conclusions:

  • Understanding skin hydration regulation is key to managing dry skin conditions.
  • Recent data and improved measurement techniques offer better strategies for dry skin management.
  • Optimizing skin hydration supports overall skin health and barrier function.