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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
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Resistance01:19

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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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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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Resistors In Parallel01:23

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Resistors are in parallel when one end of all the resistors are connected to a continuous wire of negligible resistance and the other end of all the resistors are also connected to one another through a continuous wire of negligible resistance. In the case of a parallel configuration, the potential drop across each resistor is the same. Current through each resistor can be found using Ohm’s law, I = V/R, where the voltage is constant across each resistor. The sum of the individual...
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Soft Variable Resistance Material for Pressure Sensing Platform.

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    This summary is machine-generated.

    This study developed conductive foams from polydimethylsiloxane (PDMS) and polyurethane (PU) with carbon nanotubes (CNTs) for prosthetic sensors. PDMS foam demonstrated superior elasticity and potential for detecting mechanical loads via resistance changes.

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    Area of Science:

    • Materials Science
    • Biomedical Engineering
    • Nanotechnology

    Background:

    • Polydimethylsiloxane (PDMS) and polyurethane (PU) foams are common in prosthetic liners.
    • Developing effective sensors for prosthetic sockets is crucial for amputees.
    • Carbon nanotubes (CNTs) can impart unique electrical properties to polymers.

    Purpose of the Study:

    • To investigate the mechanical and conductive properties of CNT-coated PDMS and PU foams.
    • To evaluate the suitability of these modified foams as sensor elements for prosthetic applications.
    • To demonstrate a method for detecting localized mechanical load using the foam's electrical response.

    Main Methods:

    • Fabrication of porous PDMS and PU foams.
    • Coating the foams with carbon nanotubes (CNTs).
    • Mechanical testing to assess elasticity and durability.
    • Characterization of piezo-conductive properties.
    • Demonstration of load sensing via resistance and color change.

    Main Results:

    • CNT coating endowed the foams with positive piezo-conductivity for mechanical load sensing.
    • PDMS foam exhibited excellent elastic recovery after repeated compression, unlike PU foam.
    • Localized mechanical load on PDMS foam reduced electrical resistance.
    • Joule heating of a thermochromic dye by the foam produced a visible color change.

    Conclusions:

    • CNT-modified PDMS foam is a promising material for developing robust and sensitive sensors for prosthetic sockets.
    • The material's ability to detect localized mechanical load through electrical resistance changes offers a novel sensing mechanism.
    • This technology could significantly improve the fitting process and comfort for lower limb amputees.