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Vapor Pressure Lowering03:28

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The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
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The physical form of a substance changes by 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. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
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When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
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Controlling Self-Assembly in Gyroid Terpolymer Films By Solvent Vapor Annealing.

James A Dolan1,2,3, Karolina Korzeb3, Raphael Dehmel3

  • 1Department of Physics, University of Cambridge, J.J. Thomson Avenue, Cambridge, CB3 0HE, UK.

Small (Weinheim an Der Bergstrasse, Germany)
|September 26, 2018
PubMed
Summary

Solvent vapor annealing (SVA) effectively controls triblock terpolymer self-assembly into gyroid networks. Understanding SVA parameters is crucial for creating ordered films for advanced applications like optical metamaterials.

Keywords:
block copolymer self-assemblygyroidsin situ grazing-incidence small-angle X-ray scattering (GISAXS)solvent vapor annealingtriblock terpolymers

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Solvent vapor annealing (SVA) is effective for controlling linear diblock copolymer self-assembly.
  • Triblock terpolymers offer access to complex network morphologies, including gyroid phases, for novel nanoscale devices.
  • Fabricating 3D continuous networks for applications like optical metamaterials requires understanding SVA in terpolymer systems.

Purpose of the Study:

  • To investigate the self-assembly of a gyroid-forming triblock terpolymer during solvent vapor annealing (SVA).
  • To reveal the impact of key SVA parameters on morphology, lateral order, and film preservation.
  • To assess the robustness of the terpolymer gyroid morphology for successful SVA.

Main Methods:

  • In situ grazing-incidence small-angle X-ray scattering (GISAXS) was employed.
  • The study focused on a gyroid-forming triblock terpolymer undergoing SVA.
  • Analysis centered on morphology, lateral order, and dried film preservation.

Main Results:

  • SVA parameters significantly influence terpolymer morphology and lateral order.
  • The study identified key factors affecting the preservation of the gyroid network in dried films.
  • The robustness of the terpolymer gyroid morphology was confirmed as essential for SVA.

Conclusions:

  • Detailed understanding of SVA in terpolymer network morphologies is vital for device fabrication.
  • Optimizing SVA parameters can lead to films with long-range order for optical metamaterial applications.
  • The terpolymer gyroid morphology demonstrates robustness under controlled SVA conditions.