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Related Concept Videos

Resistance01:19

Resistance

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When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
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Resistivity01:22

Resistivity

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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
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Resistance and Conductance01:25

Resistance and Conductance

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A conductor's DC resistance at a given temperature is influenced by its resistivity, length, and cross-sectional area. Resistivity is an inherent property of the conductor material, with annealed copper serving as the international standard for measurement. For instance, the resistivity of hard-drawn aluminum at 20 degrees Celsius is 61% of the standard conductivity of annealed copper.
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Non-ohmic Devices00:51

Non-ohmic Devices

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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Capillarity in Fluid01:19

Capillarity in Fluid

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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
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Kapitza resistance at water-graphene interfaces.

Sobin Alosious1, Sridhar Kumar Kannam2, Sarith P Sathian1

  • 1Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai 600036, India.

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|June 15, 2020
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Summary

We studied heat transfer at the water-graphene interface using molecular dynamics. Our equilibrium molecular dynamics (EMD) method accurately calculates Kapitza resistance, crucial for nanoscale systems.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Computational Physics

Background:

  • Heat transfer at fluid-solid interfaces is critical for nanoscale systems.
  • Kapitza resistance quantifies thermal resistance at such interfaces.
  • Understanding water-graphene interface thermal properties is essential for designing nanoelectronic devices.

Purpose of the Study:

  • Investigate Kapitza resistance at the water-graphene interface.
  • Evaluate the impact of system size (graphene layers, area, water width) on Kapitza resistance.
  • Validate a novel equilibrium molecular dynamics (EMD) method for calculating Kapitza resistance.

Main Methods:

  • Classical molecular dynamics simulations.
  • Equilibrium molecular dynamics (EMD) method.
  • Non-equilibrium molecular dynamics (NEMD) simulations for comparison.

Main Results:

  • Kapitza resistance slightly decreases with increasing graphene layers.
  • Cross-sectional area and water block width have negligible effects on Kapitza resistance.
  • EMD method results agree well with NEMD simulations across various potentials and water models.

Conclusions:

  • The EMD method provides an efficient alternative to NEMD for calculating Kapitza resistance.
  • The water-graphene interface thermal transport is largely independent of system size.
  • The findings are significant for thermal management in nanoscale applications.