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Related Concept Videos

Electro-mechanical Systems01:19

Electro-mechanical Systems

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Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...
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Back EMF01:24

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Generators convert mechanical energy into electrical energy, whereas motors convert electrical energy into mechanical energy. A motor works by sending a current through a loop of wire located in a magnetic field. As a result, the magnetic field exerts a torque on the loop. This rotates a shaft, extracting mechanical work from the electrical current sent in initially. When the coil of a motor is turned, magnetic flux changes through the coil, and an emf (consistent with Faraday's law) is...
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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
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Force On A Current Loop In A Magnetic Field01:17

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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,...
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Electromotive Force02:36

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Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled  that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc  with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one...
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Faraday Disk Dynamo01:23

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Related Experiment Video

Updated: Aug 14, 2025

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

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An electric molecular motor.

Long Zhang1, Yunyan Qiu2, Wei-Guang Liu3

  • 1Department of Chemistry, Northwestern University, Evanston, IL, USA. long.zhang@northwestern.edu.

Nature
|January 11, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed an electric molecular motor using a [3]catenane structure. This motor features two interlocked rings that rotate unidirectionally around a loop, powered by electricity, marking a step towards sustainable molecular machines.

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Area of Science:

  • Supramolecular Chemistry
  • Molecular Machines
  • Nanotechnology

Background:

  • Macroscopic electric motors are vital, driving interest in developing electricity-powered molecular motors.
  • Existing molecular motors often lack efficient unidirectional movement or rely on chemical fuels.

Purpose of the Study:

  • To design and demonstrate an electrically driven molecular motor capable of continuous, unidirectional rotary motion.
  • To investigate the role of interlocked ring interactions in achieving controlled molecular movement.

Main Methods:

  • Synthesis of a [3]catenane molecular structure featuring two cyclobis(paraquat-p-phenylene) (CBPQT4+) rings around a 50-membered loop.
  • Utilizing an oscillating voltage or modulated redox potential to power the unidirectional circumrotation of the rings.
  • Employing a flashing energy ratchet mechanism to guide the movement.

Main Results:

  • Achieved 85% unidirectional movement of both CBPQT4+ rings around the loop.
  • Observed a two-dimensional potential energy surface arising from inter-ring interactions, analogous to FOF1 ATP synthase.
  • Demonstrated that a [2]catenane lacked sufficient kinetic asymmetry for unidirectional motion, highlighting the importance of the second ring in the [3]catenane.

Conclusions:

  • Successfully demonstrated a waste-free, electrically driven molecular motor based on a [3]catenane.
  • The interlocked ring system provides essential symmetry breaking for unidirectional motion.
  • This work is a significant advancement towards the development of surface-bound electric molecular motors.