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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

50.5K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
50.5K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

72.0K
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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Electrolytes: van't Hoff Factor03:08

Electrolytes: van't Hoff Factor

36.8K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
36.8K
The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

57.7K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
57.7K
Carbon Skeletons01:12

Carbon Skeletons

115.2K
Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
115.2K
Equivalent Capacitance01:19

Equivalent Capacitance

711
From the study of resistive circuits, it is understood that employing a series-parallel combination serves as an effective strategy for simplifying circuits. Capacitors can be arranged within a circuit in one of two ways: a series configuration or a parallel configuration. The way these capacitors are connected to a battery will influence both the potential drop across each individual capacitor and the size of the charge that each capacitor can store. This is determined by the specific type of...
711

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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

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Carbon-Nanotube-Electrolyte Interface: Quantum and Electric Double Layer Capacitance.

Jinfeng Li, Phi H Q Pham, Weiwei Zhou

    ACS Nano
    |September 19, 2018
    PubMed
    Summary
    This summary is machine-generated.

    We studied electrochemical capacitance in nanoscale electronic materials, revealing quantum capacitance effects comparable to electrochemical capacitance. This finding advances understanding of nanoscale electrochemical systems.

    Keywords:
    Gouy−Chapman-Stern modelcarbon nanotubesdouble layerelectrochemical impedance spectroscopymodified Poisson−Boltzmann equationquantum capacitance

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    Area of Science:

    • Materials Science
    • Electrochemistry
    • Nanotechnology

    Background:

    • Conventional electrodes differ significantly from nanoscale materials.
    • Electrochemical systems involve complex interfacial phenomena.

    Purpose of the Study:

    • To investigate electrochemical capacitance in one-dimensional electronic materials.
    • To model and measure the unique capacitance behavior of nanoscale electrodes.

    Main Methods:

    • Electrochemical impedance spectroscopy (EIS) from 0.1 Hz to 1 MHz.
    • Transmission-line model for in-plane conductance and interfacial impedance.
    • Modified Poisson-Boltzmann equation for ionic strength dependence.

    Main Results:

    • Nanoscale electrode dimensions qualitatively alter capacitance.
    • Quantum capacitance is comparable to electrochemical capacitance.
    • Total capacitance per tube measured at 0.67-1.13 fF/μm.

    Conclusions:

    • Electrochemical capacitance in nanoscale systems is influenced by quantum effects.
    • The study provides a quantitative model for decoupling different capacitance contributions.
    • Findings are relevant for designing advanced electrochemical devices.