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Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
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Understanding the movement of a rigid body in planar motion involves recognizing that every particle within this body is traversing a path that maintains a consistent distance from a specific plane. This concept is fundamental in the study of physics and mechanical engineering, and it allows us to comprehend better how objects move in space.
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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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Updated: Jun 29, 2025

Reactive Inkjet Printing and Propulsion Analysis of Silk-based Self-propelled Micro-stirrers
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Induction for Self-Propelled Motion of Artificial Objects with/without Shape Anisotropy.

Taisuke Banno1, Kazuki Ueno1, Tomoya Kojima1

  • 1Department of Applied Chemistry, Faculty of Science and Technology, Keio University.

Journal of Oleo Science
|March 31, 2024
PubMed
Summary

Researchers are exploring artificial self-propelled motion inspired by microorganisms. This review details recent advances in creating self-moving artificial objects from molecular properties for new materials and understanding life.

Keywords:
Marangoni effectactive matterself-propelled motionshape anisotropystimuli-responsiveness

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Area of Science:

  • Active matter physics and supramolecular chemistry.
  • Interdisciplinary research bridging chemistry, physics, and biology.

Background:

  • Living systems exhibit autonomous motion in response to environmental stimuli.
  • Understanding microorganism motility is key to developing artificial self-propelled systems.
  • Artificial object fabrication with shape anisotropy is crucial for controlled motion.

Approach:

  • Reviewing recent progress in inducing self-propelled motion in artificial objects.
  • Investigating methods for designing and experimentally inducing life-like dynamic behaviors.
  • Focusing on the role of molecular properties in achieving directed movement.

Key Points:

  • Self-propelled motion is a fundamental characteristic of life.
  • Artificial objects can be engineered to mimic biological motility.
  • Precise control over experimental conditions and object shape is essential.
  • Advances in active matter and supramolecular chemistry are driving progress.

Conclusions:

  • Designing self-propelled motion from molecular properties offers control over functions.
  • This research enhances understanding of biological systems.
  • Enables the creation of novel materials with life-like properties.