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Cohesion01:07

Cohesion

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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a...
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Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

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Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...
22
Mortar Properties01:17

Mortar Properties

691
Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
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Water Cement Ratio01:28

Water Cement Ratio

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The water-cement ratio is pivotal in defining concrete's quality. This ratio, a balance between the weight of water and cement in the mix, shapes the concrete's strength, durability, and resistance to environmental factors. As identified by Abrams’ law, less water in the mix equates to stronger concrete. However, water is essential not only for the chemical process of hydration but also for the concrete's workability and compaction. While hydration chemically binds water and...
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Ferrocement01:30

Ferrocement

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Ferro-cement is a distinctive construction material that represents an innovative variant of reinforced concrete, characterized by its unique composition and the method by which it is formed. Unlike standard reinforced concrete, which relies on larger steel bars for reinforcement, ferro-cement utilizes densely packed layers of mesh or fine rods, fully encased in cement mortar. This composition allows for the creation of structures that are significantly thinner and more flexible than their...
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Superplasticizers01:30

Superplasticizers

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Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
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Easy Manipulation of Architectures in Protein-based Hydrogels for Cell Culture Applications
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天然靭帯のような機械的性能を持つ階層構造化ヒドロゲル

Diwei Shi1, Donghwan Ji2,3, Jinhye Bae4,5,6

  • 1Materials Science and Engineering Program, University of California San Diego, La Jolla, CA, USA.

Nature communications
|December 13, 2025
PubMed
まとめ

研究者たちは、自然の靭帯に触発された、強力で硬く、丈夫な合成ヒドロゲルを開発しました。これらの生体模倣ヒドロゲルは、ポリマー複合材料の設計における以前の限界を克服する優れた機械的特性を示しています。

キーワード:
ヒドロゲル生体模倣靭帯機械的特性高分子化学

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科学分野:

  • 生体材料科学; 高分子化学; 組織工学

背景:

  • 合成ヒドロゲルは、靭帯のような自然の荷重支持組織の機械的強度と靭性がしばしば欠けています。; 既存のポリマー複合材料は、強度/剛性と靭性/伸縮性の間でトレードオフに直面しています。

研究 の 目的:

  • 自然の靭帯の機械的特性と階層構造を模倣する合成ヒドロゲルを設計すること。; ポリマー複合材料の強度、剛性、靭性、および伸縮性における従来の限界を克服すること。

主な方法:

  • ポリマーマトリックス内のポリマー粒子ハイブリッド凝集体を使用したヒドロゲル繊維（直径数百マイクロメートル）の作製。; 靭帯構造を再現するためのヒドロゲル繊維の平行束への組み立て。; 引張強度、弾性率、靭性、および伸縮性を含む機械的特性の特性評価。

主要な成果:

  • 高い引張強度（61±8 MPa）、弾性率（131±15 MPa）、および靭性（135±11 MJ m⁻³）を達成しました。; 400％を超える優れた伸縮性を示しました。; 階層的な束は数十キログラムの負荷に耐え、ひずみセンサーとして機能しました。

結論:

  • 設計されたヒドロゲルは、靭帯の構造と機能をうまく模倣し、優れた機械的性能を提供します。; この生体模倣アプローチは、合成ヒドロゲル開発における主要な限界を克服します。; 開発された材料は、荷重支持組織工学およびソフトロボット工学への応用が期待されます。