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Related Concept Videos

Diffusion01:12

Diffusion

216.9K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

Diffusion

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Freezing Point Depression and Boiling Point Elevation03:12

Freezing Point Depression and Boiling Point Elevation

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Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
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Cell-surface Signaling01:21

Cell-surface Signaling

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Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.
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Facilitated Diffusion01:16

Facilitated Diffusion

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Related Experiment Video

Updated: Jan 23, 2026

Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces
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Diffusion-Freezing-Induced Microphase Separation for Constructing Large-Area Multiscale Structures on Hydrogel

Wenwei Lei1, Shuanhu Qi1, Qinfeng Rong1

  • 1Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|June 14, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a facile method to create large-area structured hydrogel surfaces. This technique utilizes polymer diffusion and freezing to produce gradient and patterned surfaces with potential anti-dehydration applications.

Keywords:
anti-dehydrationhydrogelsliquid transportmicrophase separationmultiscale structured surfaces

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Area of Science:

  • Materials Science
  • Polymer Science
  • Surface Engineering

Background:

  • Hydrogels with multiscale structured surfaces are valuable for diverse applications.
  • Current fabrication methods are complex, material-specific, and inefficient for large-area production, limiting practical use.

Purpose of the Study:

  • To develop a general, reliable, and large-area fabrication method for structured hydrogel surfaces.
  • To overcome the limitations of existing complex manufacturing processes.

Main Methods:

  • Utilized the interplay between polymer chain diffusion and freezing-induced gelation.
  • Incorporated microphase separation processes.
  • Introduced temperature gradients and controlled contact area shape to create gradient structures and patterns.

Main Results:

  • Successfully fabricated hydrogel surfaces with gradient structures and patterns.
  • Demonstrated the micro/nanostructured surfaces function as capillary systems.
  • Showcased spontaneous liquid uplift, indicating anti-dehydration potential.

Conclusions:

  • The proposed method offers a facile and scalable approach for fabricating functionalized hydrogel surfaces.
  • This technique can inspire the design of advanced materials with tailored surface properties.
  • The anti-dehydration capability highlights promising practical applications.