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Related Concept Videos

Ionic Radii03:10

Ionic Radii

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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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The Power Flow Problem and Solution01:26

The Power Flow Problem and Solution

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Power flow problem analysis is fundamental for determining real and reactive power flows in network components, such as transmission lines, transformers, and loads. The power system's single-line diagram provides data on the bus, transmission line, and transformer. Each bus k in the system is characterized by four key variables: voltage magnitude Vk​, phase angle δk​, real power Pk​, and reactive power Qk​. Two of these four variables are inputs, while the power flow program computes...
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Ionic Bonds00:42

Ionic Bonds

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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Electric Generator: Alternator01:25

Electric Generator: Alternator

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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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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
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Electricity Generation from Capillary-Driven Ionic Solution Flow in a Three-Dimensional Graphene Membrane.

Changzheng Li, Zhiqun Tian, Lizhe Liang

    ACS Applied Materials & Interfaces
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    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new way to generate electricity using a three-dimensional graphene (3DG) membrane and an ionic solution. This novel energy-scavenging method offers a promising solution for powering small devices.

    Keywords:
    3D graphenecapillary-driven flowenergy harvestingself-powered systemstreaming potential

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    Area of Science:

    • Materials Science
    • Energy Harvesting
    • Nanotechnology

    Background:

    • Ambient energy harvesting is crucial for micro/nanodevices and self-powered systems.
    • Existing methods for energy generation from nanomaterials and water interactions yield limited output.

    Purpose of the Study:

    • To develop a novel energy-scavenging method using a three-dimensional graphene (3DG) membrane.
    • To investigate the spontaneous electricity generation from ionic solutions infiltrating a 3DG membrane under ambient conditions.

    Main Methods:

    • Fabrication of a three-dimensional graphene (3DG) nanogenerator (3DGNG).
    • Measurement of electrical output (voltage and current) from the 3DGNG under ambient conditions.
    • Demonstration of device application by powering a liquid crystal display (LCD).

    Main Results:

    • The 3DGNG spontaneously generated electricity from an ionic solution at ambient conditions.
    • A 0.5 × 2 cm 3DGNG produced a continuous voltage of ~0.28 V and an output current of ~62 μA.
    • The generated voltage significantly exceeds previously reported values for similar systems.

    Conclusions:

    • A novel and efficient method for ambient energy harvesting using 3DG membranes has been demonstrated.
    • The 3DG nanogenerator shows potential for powering small electronic devices.
    • This research opens new possibilities for developing self-powered systems through sustainable energy scavenging.