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Related Concept Videos

Frictional Force01:07

Frictional Force

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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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Static and Kinetic Frictional Force01:05

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
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Dry Friction01:30

Dry Friction

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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
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Types of Friction Problems01:27

Types of Friction Problems

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Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
The first type of dry friction problem involves situations where there is no apparent impending motion....
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Actin Treadmilling01:18

Actin Treadmilling

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Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...
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Kinetic Friction01:26

Kinetic Friction

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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
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Updated: Jan 15, 2026

Pattern Generation for Micropattern Traction Microscopy
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Soft Microbot Traction on Structured Surfaces.

Fangrong Zou1, Yan Gao2, Ning Wu1

  • 1Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado 80401, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 8, 2025
PubMed
Summary
This summary is machine-generated.

Soft microbots (μbots) show promise for drug delivery. Grooved surfaces improve their traction by up to 3-fold, optimizing locomotion for complex environments.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Robotics

Background:

  • Soft microbots (μbots) offer advantages over rigid designs for in vivo applications like targeted drug delivery due to their deformability and biocompatibility.
  • Previous magnetic particle-based Pickering emulsion soft μbots exhibited limited traction and transport efficiency on flat surfaces due to significant slip during locomotion.

Purpose of the Study:

  • To investigate the effect of substrate topography on the locomotion and traction of soft microbots.
  • To identify methods for enhancing microbot performance in complex physiological environments.

Main Methods:

  • Development of magnetic particle-based Pickering emulsion soft microbots.
  • Utilizing substrates with controlled groove topography (varying width and depth).
  • Analysis of microbot locomotion patterns, including slip and no-slip motion, and measurement of traction force.

Main Results:

  • Substrate topography, specifically grooves, induced a bimodal locomotion pattern with both slip and no-slip motion.
  • Microbot traction increased up to 3-fold on grooved surfaces compared to flat surfaces.
  • Traction was systematically tunable by altering groove width and depth.

Conclusions:

  • Substrate topography is a critical factor in optimizing soft microbot locomotion and traction.
  • Grooved surfaces provide a mechanism to enhance microbot performance, enabling more efficient navigation and transport in complex environments.
  • This work presents a strategy for tuning microbot performance for heterogeneous physiological terrains.