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Related Concept Videos

Aldol Condensation vs Claisen Condensation01:33

Aldol Condensation vs Claisen Condensation

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Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral...
7.9K
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Aldol Condensation with β-Diesters: Knoevenagel Condensation01:27

Aldol Condensation with β-Diesters: Knoevenagel Condensation

3.8K
The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
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Resistivity01:22

Resistivity

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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
4.6K
Resistance01:19

Resistance

6.0K
When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
6.0K
C–C Bond Formation: Aldol Condensation Overview01:10

C–C Bond Formation: Aldol Condensation Overview

16.3K
Aldol condensation is an important route in synthetic organic chemistry used to generate a new carbon–carbon bond under basic or acidic conditions. The aldol condensation reaction presented in Figure 1 constitutes an aldol addition reaction followed by the dehydration process.
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Toward Condensation-Resistant Omniphobic Surfaces.

Kyle L Wilke1, Daniel J Preston1, Zhengmao Lu1

  • 1Department of Mechanical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States.

ACS Nano
|October 10, 2018
PubMed
Summary

Researchers developed a novel nanostructured surface that maintains omniphobicity, repelling all liquids even during condensation. This breakthrough prevents condensate nucleation and destruction of surface properties, ensuring robust liquid repellency.

Keywords:
condensationhydrophobicnucleationomniphobicreentrant nanocavity

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Omniphobic surfaces, utilizing reentrant structures, repel all liquids without low-surface-energy coatings.
  • Existing omniphobic surfaces fail during condensation due to condensate nucleation within reentrant geometries, destroying omniphobicity.

Purpose of the Study:

  • To design and demonstrate a nanostructured surface that maintains omniphobicity during condensation.
  • To prevent condensate nucleation and spreading within reentrant structures.

Main Methods:

  • Fabrication of isolated reentrant cavities with nanoscale pitch (approx. 100 nm).
  • Development of a predictive model to guide surface design.
  • Experimental testing of fabricated surfaces with various liquids under condensation conditions.

Main Results:

  • Demonstrated liquid repellency maintained below the dew point (up to 10 °C lower).
  • Achieved robust omniphobicity that persisted for over 3 weeks.
  • Surface design effectively prevented droplet nucleation and spreading within cavities.

Conclusions:

  • Nanostructured surfaces with isolated reentrant cavities offer a solution to condensation-induced failure of omniphobicity.
  • This approach enables robust and durable omniphobic surfaces for diverse applications.
  • The findings provide critical insights for designing advanced liquid-repellent materials.