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Related Concept Videos

Adhesion01:14

Adhesion

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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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Cell Adhesion in Plants01:14

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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.
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Laminins are the Adhesive Proteins of Basal Lamina00:55

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Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
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The Extracellular Matrix01:29

The Extracellular Matrix

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In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
Composition of the Extracellular Matrix
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Bioplastics01:27

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Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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Preparation and Testing of Plant Seed Meal-based Wood Adhesives
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A meniscus-inspired, environmentally robust, tough soybean-based adhesive.

Jing Luo1, Guoyan Zuo1, Feng Zhu1

  • 1Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China. zhaoyangxunjfu@hotmail.com.

Materials Horizons
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Summary

This study developed a formaldehyde-free bio-based adhesive inspired by the meniscus structure. The new soy protein and poly(ethylene glycol itaconate) adhesive offers superior toughness and bonding strength for various materials.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Sustainable Chemistry

Background:

  • Formaldehyde-free bio-based adhesives are crucial for sustainable materials.
  • Existing bio-adhesives often suffer from brittleness and poor performance.
  • The meniscus's structure, with rigid and flexible components, offers a biomimetic design inspiration.

Purpose of the Study:

  • To develop a robust and versatile formaldehyde-free bio-based adhesive.
  • To enhance adhesive toughness and bonding performance using a biomimetic approach.
  • To explore the potential of renewable resources in adhesive formulation.

Main Methods:

  • Synthesized poly(ethylene glycol itaconate) (EIA) from itaconic acid derived from crop straws.
  • Incorporated EIA as a buffer layer into a soy protein cross-linked network via hydrogen bonding.
  • Evaluated adhesive properties including adhesion work, shear strength, and performance on diverse substrates.

Main Results:

  • The optimized SM/EIA adhesive exhibited a 458% increase in adhesion work (0.424 J), indicating superior toughness.
  • Achieved dry and wet shear strengths of 2.05 MPa and 1.13 MPa, respectively.
  • Demonstrated versatile bonding on wood, ceramics, and metals, with excellent water retention and mold resistance.

Conclusions:

  • The biomimetic SM/EIA adhesive successfully overcomes the limitations of traditional bio-adhesives.
  • This approach offers a sustainable alternative to petroleum-based adhesives.
  • The study provides a novel strategy for designing high-performance bio-based materials.