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Related Concept Videos

Adhesion01:14

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.

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AC Electrokinetic Phenomena Generated by Microelectrode Structures
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AC Electrokinetic Phenomena Generated by Microelectrode Structures

Published on: July 28, 2008

Electro-dry-adhesion.

Jeffrey Krahn1, Carlo Menon

  • 1MENRVA Research Group, School of Engineering Science, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada V5A1S6.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 9, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed new mushroom-shaped dry adhesives that combine electrostatic and van der Waals forces for stronger adhesion. This electro-adhesion technology significantly boosts bond strength across various materials.

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Standard Test Method ASTM D 7998-19 for the Cohesive Strength Development of Wood Adhesives
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Standard Test Method ASTM D 7998-19 for the Cohesive Strength Development of Wood Adhesives
08:40

Standard Test Method ASTM D 7998-19 for the Cohesive Strength Development of Wood Adhesives

Published on: May 17, 2020

Area of Science:

  • Materials Science
  • Adhesion Science
  • Biomimetics

Background:

  • Traditional dry adhesives rely on van der Waals forces, which are often insufficient for strong bonding.
  • Bioinspired designs mimic natural adhesion mechanisms, offering potential for enhanced performance.
  • Controlling adhesion forces is crucial for applications ranging from robotics to medical devices.

Purpose of the Study:

  • To develop novel conductive bioinspired dry adhesives utilizing a synergistic combination of electrostatic and van der Waals forces (electro-dry-adhesion).
  • To quantify the increase in shear adhesion bond strength achievable with electro-dry-adhesion across diverse materials.
  • To investigate the role of electrostatic preloading in maintaining adhesion after the electrical field is removed.

Main Methods:

  • Fabrication of conductive bioinspired dry adhesives with mushroom-shaped caps.
  • Application of varying electrical fields to induce electrostatic forces.
  • Measurement of shear adhesion bond strength on multiple material substrates under atmospheric and reduced pressure.
  • Comparison of self-preloading via electrostatics with direct mechanical preloading.

Main Results:

  • A significant increase in shear adhesion bond strength, up to 2046%, was observed with the application of an electrical field (36.4 V μm⁻¹).
  • No suction effect was detected from the fiber shape, indicating adhesion is dominated by electrostatic and van der Waals forces.
  • Electrostatic preloading enabled sustained adhesion by ensuring close contact for van der Waals forces, even after the electrical field was deactivated.
  • Self-preloading achieved comparable shear bond strength to direct mechanical preloading at 3.33 kV.

Conclusions:

  • Electro-dry-adhesion presents a highly effective method for dramatically enhancing adhesive strength on a wide range of materials.
  • The synergistic interplay between electrostatic and van der Waals forces, facilitated by bioinspired designs, offers a powerful approach to adhesion control.
  • Electrostatic preloading is a viable strategy for achieving robust and persistent adhesion in dry adhesive systems.