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Related Concept Videos

Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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Viral Structure00:56

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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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Related Experiment Video

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3D Printing - Evaluating Particle Emissions of a 3D Printing Pen
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3D Printing of Bioinspired Liquid Superrepellent Structures.

Xiaojiang Liu1, Hongcheng Gu1, Min Wang1

  • 1State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.

Advanced Materials (Deerfield Beach, Fla.)
|April 1, 2018
PubMed
Summary

Researchers developed novel triply re-entrant structures using 3D printing for advanced liquid superrepellence. These surfaces repel even low-surface-tension liquids, enabling new applications in microfluidics and sensors.

Keywords:
3D printingdirectional flowsuperrepellentstriply re-entrant structurestwo-photon polymerization

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Bioinspired re-entrant structures offer liquid superrepellence, but struggle with low-surface-energy liquids.
  • Existing fluorination-dependent surfaces often fail to repel liquids with surface tension below 15 mN m⁻¹.
  • Overcoming this limitation is crucial for applications involving challenging solvents.

Purpose of the Study:

  • To fabricate and characterize novel triply re-entrant structures for enhanced liquid superrepellence.
  • To demonstrate superrepellence against a wide range of liquids, including those with extremely low surface energy.
  • To explore the potential of these structures in microfluidic devices and other advanced applications.

Main Methods:

  • Utilized two-photon polymerization based 3D printing to create triply re-entrant structures.
  • Fabricated structures on both rigid and flexible substrates.
  • Investigated liquid repellency for water and various organic liquids with surface tensions from 12.0 to 72.8 mN m⁻¹.

Main Results:

  • Achieved superrepellence for water (72.8 mN m⁻¹) and organic liquids (12.0–27.1 mN m⁻¹).
  • Demonstrated robust superrepellency on both rigid and flexible substrates, maintaining properties after oxygen plasma treatment.
  • Constructed micro open capillaries for directional liquid spreading on the superrepellent surfaces.

Conclusions:

  • Triply re-entrant structures fabricated via 3D printing effectively achieve superrepellence for diverse liquids, including low-surface-energy ones.
  • The developed structures exhibit durability and versatility, suitable for rigid and flexible platforms.
  • The ability to control liquid spreading opens possibilities for microfluidic platforms, lab-on-a-chip devices, and other technological applications.