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Related Concept Videos

Adhesion01:14

Adhesion

37.0K
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...
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Adherens Junctions01:24

Adherens Junctions

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
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Anchoring Junctions01:03

Anchoring Junctions

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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

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Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
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Desmosomes01:05

Desmosomes

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The term desmosome derives from the Greek words "desmo" and "soma" meaning "adhesion bodies." This structure was first observed during the late 1800s and described as small, dense nodules in the epidermis. Desmosomes are button-like structures that help form an interlinked network of intermediate filaments across the cells. These junctions are  essential to hold cells together under mechanical stress and to maintain tissue integrity. Desmosomes are multi-protein...
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TAPE: A Biodegradable Hemostatic Glue Inspired by a Ubiquitous Compound in Plants for Surgical Application
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Gecko-inspired bidirectional double-sided adhesives.

Zhengzhi Wang1, Ping Gu, Xiaoping Wu

  • 1Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, P. R. China. wzz525@mail.ustc.edu.cn.

Soft Matter
|March 19, 2014
PubMed
Summary
This summary is machine-generated.

Gecko-inspired double-sided adhesives (DSAs) with dual-angled micro-pillars offer controllable, bidirectional adhesion. Antisymmetric DSAs amplify adhesion, while symmetric DSAs provide isotropic adhesion, expanding biomimetic dry adhesive applications.

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Area of Science:

  • Materials Science
  • Biomimetics
  • Adhesion Science

Background:

  • Single-sided adhesives (SSAs) inspired by gecko feet are widely studied.
  • Developing controllable and bidirectional dry adhesives remains a challenge.
  • Biomimetic approaches offer novel solutions for adhesion technologies.

Purpose of the Study:

  • To introduce a novel concept of gecko-inspired double-sided adhesives (DSAs).
  • To investigate the adhesion properties of symmetric and antisymmetric DSAs.
  • To compare DSA performance against single-sided adhesive (SSA) counterparts.

Main Methods:

  • Fabrication of DSAs using dual-angled micro-pillars on both sides of a substrate.
  • Employing techniques including angled etching, mold replication, tip modification, and curing bonding.
  • Conducting non-conformal and conformal adhesion tests to evaluate performance.

Main Results:

  • DSAs exhibit controllable and bidirectional adhesion capabilities.
  • Antisymmetric DSAs significantly amplify adhesion (25.8 ± 2.8 N cm⁻²) and anisotropy (∼8).
  • Symmetric DSAs produce nearly isotropic adhesion, counteracting SSA properties (16.2 ± 1.7 N cm⁻², ∼6).

Conclusions:

  • The dual-pillar layer design in DSAs allows for tunable adhesion amplification or counteraction.
  • DSAs can function as versatile fasteners and in micro-delivery systems.
  • Double-sided patterning represents a new direction for developing advanced biomimetic dry adhesives.