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Related Concept Videos

Magnetic Force01:18

Magnetic Force

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In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
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Buoyancy01:12

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When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

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Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
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Correction: Kang et al. Fluid Flow to Electricity: Capturing Flow-Induced Vibrations with Micro-Electromechanical-System-Based Piezoelectric Energy Harvester. <i>Micromachines</i> 2024, <i>15</i>, 581.

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Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Manipulating Microrobots Using Balanced Magnetic and Buoyancy Forces.

Lin Feng1,2, Xiaocong Wu3, Yonggang Jiang4

  • 1School of Mechanical Engineering & Automation, Beihang University, Beijing 100191, China. linfeng@buaa.edu.cn.

Micromachines
|November 6, 2018
PubMed
Summary
This summary is machine-generated.

We developed a novel microrobot for precise 3D control in microfluidic chips. This buoyant robot, guided by magnetic and buoyancy forces, can grasp and deliver micro-objects, enabling new micro-manipulation capabilities.

Keywords:
micro-robotmicrofluidic chipthree-dimension manipulation

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Area of Science:

  • Robotics
  • Microfluidics
  • Biomedical Engineering

Background:

  • Precise manipulation of micro-objects is crucial for various applications.
  • Existing methods for microrobot control in microfluidic environments face limitations in achieving full 3D maneuverability.

Purpose of the Study:

  • To introduce a novel microrobot capable of three-dimensional (3D) control within a microfluidic chip.
  • To demonstrate the microrobot's ability to grasp and deliver micro-scale objects in a 3D space.

Main Methods:

  • Designed a buoyant microrobot with a hollow space for vertical (z-axis) movement using balanced magnetic and buoyancy forces.
  • Integrated xy-plane stage motion with z-axis control for comprehensive 3D microrobot navigation.
  • Attached a microgripper for grasping and manipulating micron-scale objects.

Main Results:

  • Achieved precise 3D control of the microrobot within the microfluidic chip.
  • Demonstrated the microrobot's capability to grip a 200 μm particle using the integrated microgripper.
  • Successfully delivered the gripped particle in a 3D space, showcasing the system's utility.

Conclusions:

  • The developed microrobot offers a new platform for 3D micro-manipulation in microfluidic systems.
  • The method effectively integrates magnetic and buoyancy forces with external stage control for robust microrobot operation.
  • This technology holds potential for applications in targeted drug delivery, micro-assembly, and biological research.