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Adhesion

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...

Cell Adhesion in Plants

Cell Adhesion in Plants

Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose, and...

Cellulose and Pectic Polysaccharides

Cellulose and Pectic Polysaccharides

Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth. Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...

Cell Adhesion Molecules - Types and Functions

Cell Adhesion Molecules - Types and Functions

Cell adhesion molecules (CAMs) are pivotal to multicellularity and the coordinated functioning of tissues and organ systems. They enable physical interactions between cells and provide mechanical strength to tissues. They also function as receptors for signal transmission across the plasma membrane. The CAMs are broadly classified into four families - integrins, cadherins, selectins, and immunoglobulin-like CAMs (IgCAMs).
CAM Families
The Integrin family of proteins is primarily involved in a...

Cell Adhesion Molecules - Types and Functions

Cell Adhesion Molecules - Types and Functions

Cell adhesion molecules (CAMs) are pivotal to multicellularity and the coordinated functioning of tissues and organ systems. They enable physical interactions between cells and provide mechanical strength to tissues. They also function as receptors for signal transmission across the plasma membrane. The CAMs are broadly classified into four families - integrins, cadherins, selectins, and immunoglobulin-like CAMs (IgCAMs).
CAM Families
The Integrin family of proteins is primarily involved in a...

Role of Microtubules in Cell Wall Deposition

Role of Microtubules in Cell Wall Deposition

Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of disassembly and...

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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

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Adhesion dynamics for cellulose nanocomposites.

Niklas Nordgren, Hanna Lönnberg, Anders Hult

ACS Applied Materials & Interfaces

|April 2, 2010

Summary

This summary is machine-generated.

The adhesion in cellulose nanocomposites depends on contact time and temperature. Poly(ε-caprolactone) diffusion and entanglement significantly influence polymer-polymer interface interactions.

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Area of Science:

Polymer Science
Materials Science
Nanotechnology

Background:

Investigated poly(ε-caprolactone) (PCL) efficiency as a matrix for cellulose nanocomposites.
Utilized atomic force microscopy (AFM) with a colloidal probe for macromolecular contact analysis.
Prepared model cellulose microspheres grafted with PCL via ring-opening polymerization.

Discussion:

Adhesion between functionalized particles showed strong dependence on contact time, indicating a diffusion-controlled mechanism.
Increased temperature (60°C, near PCL's melting point) significantly enhanced adhesion at the polymer-polymer interface.
Highlighted the crucial role of polymer entanglements in the annealing of composite materials.

Key Insights:

PCL diffusion into cellulose influences adhesion dynamics.
Temperature-activated entanglements are critical for robust polymer-polymer interfaces.
Macromolecular contact level analysis provides fundamental insights into composite material behavior.

Outlook:

Further exploration of temperature-dependent diffusion and entanglement effects in PCL-based composites.
Potential for optimizing composite properties through controlled annealing processes.
Application of AFM colloidal probe technique to other polymer-nanoparticle systems.