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Related Concept Videos

Electrical Power01:07

Electrical Power

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Electric power is the product of current and voltage, represented in units of joules per second, or watts. For example, cars often have one or more auxiliary power outlets with which you can charge a cell phone or other electronic devices. These outlets may be rated at 20 amps and 12 volts, so that the circuit can deliver a maximum power of 240 watts. Consider a 25 Watt bulb and a 60 Watt bulb. The conversion of electrical energy produces heat and light, while the kinetic energy lost by the...
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Electric Generator: Alternator01:25

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Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that varies sinusoidally with time. A simple alternator consists of a conducting loop that is placed inside a uniform magnetic field. The loop is connected to split rings connected to the external circuit with the help of brushes.
The magnetic flux passing through the coil varies sinusoidally as the loop rotates inside the magnetic field. This...
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Nuclear Power02:36

Nuclear Power

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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
Nuclear Fuels
Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...
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Common Ion Effect03:24

Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
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ATP Driven Pumps II: P-type Pumps01:34

ATP Driven Pumps II: P-type Pumps

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The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
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Updated: Feb 13, 2026

Electric and Magnetic Field Devices for Stimulation of Biological Tissues
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Built-In Ion Pump Piezoionic Hydrogel Generator for Self-Powered Electrical Stimulation.

Xiaodan Yang1,2, Yi Zheng1,2, Ying Hong3

  • 1Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China.

ACS Applied Materials & Interfaces
|February 12, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new artificial ion pump (AIP) hydrogel with reduced tortuosity, significantly enhancing piezoionic effects for improved sensors and medical devices. This innovation boosts voltage response and enables effective neural regulation.

Keywords:
electrical stimulationenergy generatorion transportpiezoelectric effectpiezoionic hydrogel

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Soft Robotics

Background:

  • Piezoionic hydrogels integrate biological and electronic functions but suffer from low voltage response.
  • Understanding the link between mechanical microstructure and directional ion transport is crucial for advancing hydrogel electronics.

Purpose of the Study:

  • To analyze how structural characteristics influence piezoionic hydrogel electrical response.
  • To introduce and apply the concept of "tortuosity" to optimize hydrogel performance.
  • To develop an advanced artificial ion pump (AIP) hydrogel with enhanced piezoionic properties.

Main Methods:

  • Systematic analysis of structural influences on electrical response.
  • Introduction of "tortuosity" as a key material property.
  • Development of an AIP hydrogel with modified surface polarity and aligned porous structure.
  • Characterization of ion transport pathways and mechanical deformation.

Main Results:

  • The AIP hydrogel exhibits significantly reduced tortuosity (35%), enabling ordered ion transport and enhanced efficiency.
  • Anisotropic deformability and aligned porous structure amplify stress concentration during deformation.
  • The developed AIP hydrogel shows over a 20-fold increase in its piezoionic coefficient compared to unoptimized versions.
  • Demonstrated successful peripheral nerve regulation in mice, synchronizing with physiological rhythms.

Conclusions:

  • Established a clear structure-performance correlation in piezoionic materials through the tortuosity concept.
  • The AIP hydrogel offers a promising platform for self-powered sensing and electrical stimulation in implantable devices.
  • Highlights potential for advanced medical devices integrating sensing, energy harvesting, and therapeutic functions.