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Related Concept Videos

Polymers02:34

Polymers

41.1K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Polymers02:34

Polymers

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23.3K
Phase Transitions02:31

Phase Transitions

23.3K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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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 molecules...
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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
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Monolithic Polymer Nanoridges with Programmable Wetting Transitions.

Won-Kyu Lee1, Woo-Bin Jung2, Dongjoon Rhee1

  • 1Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208, USA.

Advanced Materials (Deerfield Beach, Fla.)
|June 29, 2018
PubMed
Summary
This summary is machine-generated.

Researchers created tunable nanostructures for dynamic wetting control. These nanostructured surfaces can switch between different wetting states, offering programmable surface properties without damage.

Keywords:
Cassie-Baxter stateCassie-impregnating stateWenzel statenanoridgespolyolefinswetting transitions

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Controlling surface wetting properties is crucial for various applications.
  • Existing methods for tunable wetting often lack durability or programmability.

Purpose of the Study:

  • To develop polymeric nanostructures with dynamically tunable wetting properties.
  • To achieve programmable control over surface wetting states through mechanical manipulation.

Main Methods:

  • Generating centimeter-scale nanoridges via strain relief in thermoplastic polyolefin films with fluoropolymer layers.
  • Tailoring surface chemistry and topography using sulfur hexafluoride (SF6) plasma etching.
  • Inducing reversible wetting state transitions (Wenzel, Cassie-Baxter, Cassie-impregnating) via cyclic substrate stretching and shrinking.

Main Results:

  • Successfully fabricated monolithic nanoridges with aspect ratios > 4 and controlled feature densities.
  • Demonstrated the ability to access multiple wetting states by modifying surface chemistry and topography.
  • Achieved reversible wetting state transitions without delamination or cracking of the nanostructured surfaces.

Conclusions:

  • Polymeric nanostructures offer a promising platform for dynamically tunable wetting.
  • Programmable control over wetting states can be achieved through mechanical deformation of these nanostructured surfaces.
  • The developed method provides a robust approach for creating adaptable surfaces with potential applications in diverse fields.