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Related Concept Videos

Ionic Radii03:10

Ionic Radii

33.9K
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...
33.9K
Ionic Bonds00:42

Ionic Bonds

132.5K
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...
132.5K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.3K
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...
20.3K
Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

68.4K
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.
68.4K
Ionic Crystal Structures02:42

Ionic Crystal Structures

18.1K
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...
18.1K
Ionic Compounds: Formulas and Nomenclature03:34

Ionic Compounds: Formulas and Nomenclature

88.2K
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.
88.2K

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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids

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Ionic-Liquid-Infused Nanostructures as Repellent Surfaces.

Yaraset Galvan1,2, Katherine R Phillips3, Marco Haumann4

  • 1Institute of Particle Technology , Friedrich-Alexander University Erlangen-Nürnberg , Cauerstrasse 4 , 91058 Erlangen , Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 23, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed repellent coatings using ionic liquids on silica nanostructures. Matching surface chemistry to ionic liquid properties enabled water repellency and controlled wetting for advanced materials.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Developing lubricant-infused repellent coatings is crucial for advanced material applications.
  • Ionic liquids (ILs) offer unique properties as low vapor pressure lubricants.
  • Controlling wetting behavior on nanoporous surfaces remains a challenge.

Purpose of the Study:

  • To investigate the wetting behavior of imidazolium-based ionic liquids on functionalized silica nanostructures.
  • To design lubricant-infused repellent coatings with tailored surface functionalities.
  • To understand the relationship between surface chemistry and IL infiltration.

Main Methods:

  • Utilized inverse opals derived from colloidal coassembly for structural color analysis.
  • Employed silane chemistry to create mixed self-assembled monolayers (SAMs) on silica nanostructures.
  • Studied the infiltration of ionic liquids with varying alkyl side chains.

Main Results:

  • Hydrophobic ionic liquids (butyl and hexyl chains) fully infiltrated inverse opals with mixed SAMs.
  • Mixed SAMs, containing imidazole and aliphatic groups, enhanced affinity with specific ILs.
  • Achieved small contact angles for IL infiltration and large contact angles for water repulsion.

Conclusions:

  • Matching chemical affinities between ionic liquids and surface functionalities is key to controlling wetting.
  • Developed a method for stable ionic liquid/solid interfaces capable of repelling water.
  • Demonstrated the potential of tailored surface chemistry for designing advanced repellent nanocoatings.