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Related Concept Videos

Adhesion01:14

Adhesion

40.7K
Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
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Intermolecular Forces03:13

Intermolecular Forces

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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...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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...
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Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.9K
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...
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Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

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Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde
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Small-molecule ionic liquid-based adhesive with strong room-temperature adhesion promoted by electrostatic

Jun Zhang1, Wenxiang Wang1, Yan Zhang1

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Researchers developed a novel ionic liquid (IL)-based adhesive, Tri-HT, overcoming low-molecular-weight adhesive challenges. This advanced material exhibits superior adhesion strength and offers tunable properties for future applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Low-molecular-weight adhesives (LMWAs) present unique advantages but struggle with achieving adhesion strengths comparable to polymeric materials due to weak cohesion and interfacial adhesion.
  • Developing LMWAs with enhanced mechanical properties remains a significant challenge in materials science.

Purpose of the Study:

  • To engineer a novel ionic liquid (IL)-based adhesive with significantly improved adhesion strength.
  • To explore the role of IL moieties and hydrogen bonding in enhancing adhesive performance.
  • To demonstrate the fabrication of advanced functional adhesives.

Main Methods:

  • Synthesized a Y-shaped molecule incorporating ionic liquid (IL) moieties and hydrogen bonding (H-bonding) interactions, named Tri-HT.
  • Investigated the impact of IL moieties on H-bonding networks and interfacial interactions.
  • Evaluated the adhesion strength of Tri-HT on various substrates.
  • Explored the combination of Tri-HT with carbon nanotubes to create advanced functional adhesives.

Main Results:

  • The synthesized IL-based adhesive, Tri-HT, achieved high adhesion strengths of up to 12.20 MPa on diverse substrates.
  • IL moieties were found to disrupt rigid H-bonding networks, freeing groups for enhanced interfacial H-bonds and providing electrostatic interactions that boosted cohesion.
  • Advanced adhesives with electrical conductivity, self-healing capabilities, and electrically-controlled adhesion were successfully fabricated by incorporating carbon nanotubes into Tri-HT.

Conclusions:

  • The developed IL-based adhesive, Tri-HT, effectively overcomes the adhesion limitations of traditional LMWAs.
  • The strategic incorporation of IL moieties offers a promising route to enhance both cohesion and interfacial adhesion in adhesive materials.
  • Tri-HT serves as a versatile platform for creating next-generation functional adhesives with tailored properties.