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The Periodic Table03:25

The Periodic Table

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As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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Phase Transitions: Melting and Freezing02:39

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Thermal Measurement Techniques in Analytical Microfluidic Devices
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Near-field thermal rectification devices using phase change periodic nanostructure.

Alok Ghanekar, Yanpei Tian, Matthew Ricci

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    |February 7, 2018
    PubMed
    Summary

    We developed novel near-field thermal rectification devices, a diode and transistor, using vanadium dioxide (VO2) phase change material. These devices dynamically control heat flow, enhancing energy efficiency through tunable thermal transport.

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    Area of Science:

    • Nanoscale heat transfer
    • Metamaterials
    • Thermal management

    Background:

    • Near-field thermal radiation is crucial for nanoscale energy transfer.
    • Phase change materials like vanadium dioxide (VO2) offer tunable thermal properties.
    • Controlling heat flow directionally (thermal rectification) is key for efficient thermal management.

    Purpose of the Study:

    • To theoretically analyze near-field thermal rectification devices.
    • To investigate dynamic control of heat flow using VO2's metal-insulator transition.
    • To enhance thermal rectification with structural modifications like gratings.

    Main Methods:

    • Theoretical analysis of radiative thermal diode and transistor performance.
    • Exploiting the metal-insulator transition of VO2 near 341 K.
    • Simulating the effect of 1-D rectangular gratings on near-field heat transfer.

    Main Results:

    • Demonstrated a radiative thermal diode with enhanced rectification via gratings.
    • Showcased a radiative thermal transistor with tunable heat flow using VO2.
    • Achieved significant variation in heat flow with small gate temperature changes.

    Conclusions:

    • Near-field thermal devices utilizing VO2 offer dynamic heat flow control.
    • Grating structures can dramatically enhance thermal rectification.
    • These devices show promise for advanced thermal management applications.