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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...
Cell Adhesion in Plants01:14

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...
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...

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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation
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Nanochitin-Fortified Polyphenol Complexes for Dry and Wet Adhesion.

Dong Wang1,2, Sameer Mhatre1, Zhangxue Han2

  • 1Bioproducts Institute, Department of Chemical & Biological Engineering, The University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.

ACS Applied Materials & Interfaces
|April 3, 2025
PubMed
Summary

This study introduces sustainable chitin nanofibers (ChNF) as a key component in novel, eco-friendly adhesives. These bio-based adhesives offer robust performance, rivaling synthetic options without environmental drawbacks.

Keywords:
adhesivesaqueous formulationsbiobased adhesivesstructural adhesivessustainable materialsunderwater adhesives

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Sustainable Chemistry

Background:

  • Synthetic adhesives present environmental and health risks due to chemical leaching.
  • There is a growing need for sustainable alternatives in industrial and household applications.

Purpose of the Study:

  • To develop a sustainable, high-performance adhesive using chitin nanofibers (ChNF).
  • To investigate aqueous-based formulations of tannic acid (TA), poly(vinyl alcohol) (PVA), and ChNF for enhanced adhesion.
  • To evaluate the adhesive properties and mechanisms for diverse applications.

Main Methods:

  • Formulation of aqueous-based adhesives using tannic acid, poly(vinyl alcohol), and chitin nanofibers.
  • Characterization of adhesive complexes through morphological, mechanical, rheological, spectroscopic, thermal, and surface analyses.
  • Testing of adhesive performance on various surfaces including stainless steel, polypropylene, and wood.

Main Results:

  • ChNF-based adhesives demonstrate exceptional adhesion driven by phenolic and hydroxyl group interactions.
  • Adhesion strength reaches up to 20 MPa, comparable to commercial structural adhesives.
  • Chitin nanofibers enhance adhesion by up to 400% and improve wet condition integrity without degradation.

Conclusions:

  • ChNF-based adhesives offer a sustainable and versatile alternative to conventional synthetic adhesives.
  • The developed formulations exhibit high performance and long-term stability.
  • These bio-based adhesives hold significant potential for diverse industrial applications.