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Related Concept Videos

The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Liquid–Solid Solutions01:29

Liquid–Solid Solutions

The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
Solid–Solid Solutions01:24

Solid–Solid Solutions

The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
Solution Equilibrium and Saturation01:59

Solution Equilibrium and Saturation

Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
Entropy and Solvation02:05

Entropy and Solvation

The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ ≥ 15); an...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Updated: May 9, 2026

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
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A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

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Solvent-dependent stabilization of metastable monolayer polymorphs at the liquid-solid interface.

Thomas Sirtl1, Wentao Song, Georg Eder

  • 1Department of Physics, Technische Universität München, James-Franck-Str 1, 85748 Garching, Germany.

ACS Nano
|July 24, 2013
PubMed
Summary
This summary is machine-generated.

This study reveals that solvent choice influences the initial self-assembly of molecular monolayers. Thermal treatment leads to a stable, densely packed structure, demonstrating a controllable phase transition for molecular monolayers.

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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Area of Science:

  • Surface science and nanotechnology
  • Supramolecular chemistry
  • Materials science

Background:

  • Molecular monolayers are crucial for advanced materials and devices.
  • Understanding self-assembly processes is key to controlling material properties.
  • Polymorphism in self-assembled monolayers affects their functionality.

Purpose of the Study:

  • To investigate the solvent-induced polymorphism of 1,3,5-tris(4 -biphenyl-4 -carbonitrile)benzene monolayers.
  • To explore the phase transitions and stability of these self-assembled monolayers.
  • To elucidate the role of solvent and thermal treatment in controlling monolayer structure.

Main Methods:

  • Scanning tunneling microscopy (STM) at the liquid-solid interface.
  • Utilizing various fatty acid homologues as solvents.
  • Employing thermal treatment (tempering) to induce phase transitions.
  • Complementary solvent-free experiments under ultrahigh vacuum (UHV) conditions.

Main Results:

  • Different fatty acid solvents induced distinct monolayer polymorphs.
  • Thermal treatment triggered irreversible phase transitions, indicating initial metastability.
  • A thermodynamically stable, densely packed monolayer polymorph was consistently obtained after thermal treatment.
  • Identical densely packed structures were achieved in both solvent-based and UHV experiments.
  • Self-assembly of metastable polymorphs at room temperature is kinetically controlled by partially solvated species.

Conclusions:

  • Solvent choice and kinetic control govern the initial self-assembly of molecular monolayers.
  • Thermal desolvation drives irreversible phase transitions to a more stable monolayer structure.
  • The study demonstrates a method for achieving a desired, thermodynamically stable monolayer polymorph.