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相关概念视频

Frictional Force01:07

Frictional Force

9.6K
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...
9.6K
Characteristics of Dry Friction01:21

Characteristics of Dry Friction

955
Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
955
Dry Friction01:30

Dry Friction

926
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...
926
Kinetic Friction01:26

Kinetic Friction

1.4K
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...
1.4K
Types of Friction Problems01:27

Types of Friction Problems

944
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....
944
Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

25.1K
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...
25.1K

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相关实验视频

Updated: Jan 15, 2026

Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel
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Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel

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在有纹理的滑剂涂层表面上进行滴滴摩擦.

Xiaoyu Chen1, Biruk Teka Gidreta1, Tanner Gaw2

  • 1Energy Transport Lab, Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.

ACS applied materials & interfaces
|October 8, 2025
PubMed
概括
此摘要是机器生成的。

纹理表面的掉落摩擦被滑膜减少,特别是在高高的,密集的柱子上. 这一发现对于控制微流体装置中的液体运动至关重要.

关键词:
兰道莱维奇德贾古因 (LLD) 法律降落摩擦摩擦 降落摩擦用滑剂注入的表面是滑剂.反射干扰对比显微镜反射干扰对比显微镜白光干涉测量白光干涉测量

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Light-induced Patterning and Grafting for Slippery Surfaces based on Silane-coated Nanoporous Structures
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相关实验视频

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271

科学领域:

  • 软物质的物理学 软物质的物理学
  • 流体动力学 流体动力学
  • 表面科学是一门科学.

背景情况:

  • 了解纹理表面的滴落摩擦对于微流体学和芯片实验室技术至关重要.
  • 之前的研究报告了关于纹理表面上滑剂薄膜存在的相互矛盾的发现.

研究的目的:

  • 为了研究柱子高度和密度对滑油涂层表面滴滴摩擦的影响.
  • 为了阐明纹理微观结构上滴滴摩擦背后的机制.
  • 为微流体应用中控制掉落摩擦提供设计准则.

主要方法:

  • 使用敏感的悬臂力传感器 (±0.1μN灵敏度) 测量摩擦力.
  • 通过白光干扰计估计滑剂层厚度.
  • 使用反射干扰对比显微镜可视化滑剂薄膜.

主要成果:

  • 高高的密集柱子上的落下摩擦力与短柱子上的摩擦力相当,这表明兰道-莱维希-德贾金 (LLD) 膜.
  • 临界柱密度约为50%的转变会使行为从"oleoplaning"到"放牧"下降.
  • 微孔和微支柱上的摩擦在同等的固体分数上是相似的,这与之前的研究相矛盾.

结论:

  • 有LLD薄膜的存在显著降低了纹理表面上的掉落摩擦.
  • 柱子密度是控制掉落摩擦的关键参数,可实现按需操纵.
  • 这项研究为设计先进的微流体系统提供了宝贵的见解.