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Related Concept Videos

Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Thermodynamic Potentials01:26

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Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...
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Joule-Thomson Effect01:21

Joule-Thomson Effect

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The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
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Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Updated: Nov 22, 2025

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Liquid Optothermoelectrics: Fundamentals and Applications.

Zhihan Chen, Pavana Siddhartha Kollipara, Hongru Ding

    Langmuir : the ACS Journal of Surfaces and Colloids
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    Summary

    Liquid optothermoelectrics utilize laser-induced heat to precisely manipulate colloidal particles in solutions. This technology offers advanced control for microswimmers and nanoscience applications.

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    Area of Science:

    • Colloidal science
    • Nanotechnology
    • Thermoelectricity

    Background:

    • Liquid thermoelectricity involves ion redistribution in solutions due to temperature gradients, creating electric fields.
    • Thermoelectric fields drive thermophoretic migration of charged colloidal particles for manipulation.
    • Macroscopic thermoelectric fields lack the spatial resolution required for nanoscale particle manipulation.

    Purpose of the Study:

    • To introduce and review the field of liquid optothermoelectrics.
    • To highlight advancements in the fundamentals, technologies, and applications of optothermoelectrics in colloidal solutions.
    • To discuss the influence of various factors on optothermoelectric manipulation and its theoretical limits.

    Main Methods:

    • Employing laser interaction with light-absorbing nanostructures for micro- and nanoscale heat management.
    • Generating localized thermoelectric fields for particle manipulation.
    • Investigating the effects of light, substrates, electrolytes, and particles on optothermoelectric manipulation.

    Main Results:

    • Development of optothermoelectric technologies for trapping, manipulating, and pulling colloidal particles.
    • Achieving precise particle control at the micro- and nanoscales using low optical power.
    • Demonstrating applications in microswimmers and nanoscience.

    Conclusions:

    • Optothermoelectric technologies offer versatile capabilities for colloidal particle manipulation.
    • The field of optothermoelectrics in colloidal solutions holds significant promise for future research and applications.
    • Continued exploration of interfacial processes and technological potential is warranted.