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Rolling Without Slipping01:09

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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
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When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
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Rolling Resistance: Problem Solving01:17

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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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Rolling and aging in temperature-ramp soft adhesion.

Giuseppe Boniello1, Christophe Tribet1, Emmanuelle Marie1

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Polymer-coated colloids exhibit complex pre-adsorption dynamics. The study reveals how polymer grafting affects colloid adhesion, influencing their movement and interaction with surfaces before immobilization.

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Area of Science:

  • Soft Matter Physics
  • Polymer Science
  • Surface Chemistry

Background:

  • Colloidal particle adhesion to surfaces is crucial in many scientific and industrial applications.
  • The behavior of polymer-coated particles near surfaces is complex and not fully understood.
  • Temperature-sensitive polymers offer tunable interactions for controlling adhesion.

Purpose of the Study:

  • To investigate the pre-adsorption dynamics of polymer-coated colloids on a horizontal substrate.
  • To understand the role of polymer grafting (poly(lysine)-grafted-poly(N-isopropylacrylamide) or PLL-g-PNIPAM) and temperature on particle adhesion.
  • To quantify adsorption rate, in-plane diffusion, and residence time before immobilization.

Main Methods:

  • Utilized video tracking to monitor micron-size colloids coated with PLL-g-PNIPAM.
  • Manipulated temperature to induce a phase transition in the PNIPAM polymer, triggering attractive interactions.
  • Analyzed Brownian motion records to extract adsorption kinetics and diffusion parameters.

Main Results:

  • Observed complex landing, jumping, crawling, and rolling events before adsorption.
  • Developed a rate-equations-based model incorporating aging effects and particle populations (untethered, rolling, arrested).
  • Demonstrated that pre-adsorption dynamics follow a characteristic scaling function dependent on polymer grafting fraction (f), related to available polymer patches.

Conclusions:

  • Preadsorption dynamics significantly influence the final adhesion behavior of polymer-coated colloids.
  • The degree of polymer grafting (f) controls the balance between untethered motion and rolling/arrested phases.
  • Understanding these dynamics is key for controlling colloidal assembly and surface interactions.