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Phase Diagram01:19

Phase Diagram

6.2K
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
6.2K
States of Matter01:20

States of Matter

2.0K
Solids, liquids, and gases are the three states of matter commonly found on Earth. A solid is rigid and possesses a definite shape. A liquid flows and takes the shape of its container, except it forms a flat or slightly curved upper surface when acted upon by gravity. Both liquid and solid samples have volumes nearly independent of pressure. A gas takes both the shape and volume of its container.
Scientists have discovered a fourth state of matter, plasma, that occurs naturally in the interiors...
2.0K
Phase Diagrams02:39

Phase Diagrams

45.1K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
45.1K
Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

45.5K
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
45.5K
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

19.3K
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...
19.3K
Distillation: Vapor–Liquid Equilibria01:01

Distillation: Vapor–Liquid Equilibria

3.2K
Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
3.2K

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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions
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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

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Solid-Liquid-Vapor Triphase Gel.

Jinpei Wang1,2, Jin Wang1, Zhizhi Sheng1

  • 1Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P. R. China.

Langmuir : the ACS Journal of Surfaces and Colloids
|November 5, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel aerohydrogel, a solid-liquid-vapor triphase gel, by combining poly(vinyl alcohol) with superhydrophobic silica aerogel microparticles. This new material offers tunable density, hydrophobicity, and elasticity for advanced applications.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Nanotechnology

Background:

  • Gels are versatile soft materials with applications in diverse fields.
  • Conventional gels (hydrogels, aerogels) possess a single interface (solid-liquid or solid-vapor).
  • This limitation restricts their application scope, necessitating the development of multi-interface gels.

Purpose of the Study:

  • To create a novel solid-liquid-vapor triphase gel with multiple interfaces.
  • To investigate the properties and potential applications of this new gel material.
  • To extend the concept of biphase gels to triphase systems.

Main Methods:

  • Gelling of poly(vinyl alcohol) aqueous solution with glutaraldehyde.
  • Incorporation of superhydrophobic silica aerogel microparticles during the gelling process.
  • Characterization of the resulting aerohydrogel's density, hydrophobicity, elasticity, and cooling performance.

Main Results:

  • Successful synthesis of a solid-liquid-vapor triphase gel, termed aerohydrogel.
  • Aerohydrogel exhibits tunable density (down to 0.43 g·cm⁻³), significant hydrophobicity, and high elasticity (80% compressive ratio).
  • Demonstrated superior evaporative cooling efficiency compared to hydrogels and commercial cooling films.

Conclusions:

  • Aerohydrogels represent a new class of triphase gels, expanding beyond traditional biphase systems.
  • The unique properties enable promising applications in cooling technologies and solar steam generation.
  • This work provides a new strategy for designing advanced soft functional materials.