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Related Concept Videos

Cohesion01:07

Cohesion

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 surface,...
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

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...
Transition Zone01:28

Transition Zone

The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
Superplasticizers01:30

Superplasticizers

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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Preparation of DNA-crosslinked Polyacrylamide Hydrogels
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Robust Hydrogel Lubricating Modification of High-Modulus Polymer Surfaces via Structure-Based Stress Transfer and

Zhaofei Ma1,2, Zhikun Wang1, Jingyue Wang1

  • 1Shandong Key Laboratory of Intelligent Energy Materials, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 27, 2026
PubMed
Summary

This study introduces a novel hydrogel lubrication method for hard polymers, enhancing durability in artificial joints and medical devices. The technique uses a gradient structure to dissipate stress and interlocks polymer chains for robust, low-friction surfaces.

Keywords:
articular cartilagehydrogelhydrogel modificationinterfacial bondinglubrication and friction

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Biomaterials

Background:

  • Hydrogel lubrication offers potential for soft robotics, tissue engineering, and biomedical devices.
  • Significant modulus mismatch between soft hydrogels and hard polymers causes interfacial stress, leading to material failure, particularly in high-load applications like artificial joints.
  • Existing surface modification strategies often struggle to balance load-bearing capacity and friction reduction.

Purpose of the Study:

  • To develop a robust hydrogel lubrication strategy for high-modulus polymer surfaces.
  • To address stress concentration issues at the interface between dissimilar materials.
  • To achieve simultaneous high load-bearing capacity and ultra-low friction for enhanced material performance.

Main Methods:

  • A gradient-structured hydrogel lubrication system was designed, featuring a modulus that increases sequentially from hundreds of kilopascals to megapascals, matching the high-modulus polymer (polydimethylsiloxane) at 10 megapascals.
  • Interfacial polymer chain interpenetration was employed to anchor the hydrogel to the polymer surface, achieving a strong anchoring force of 250 N·m⁻¹.
  • The nonhomogeneous surface structure was engineered to dissipate stress effectively.

Main Results:

  • The developed surface modification strategy successfully achieved a robust lubricating capacity with a low coefficient of friction (COF) of approximately 0.03.
  • The system demonstrated stable lubricity under ultimate-load and long-term shear conditions, withstanding contact stresses of approximately 12 MPa over 5000 cycles.
  • The gradient structure effectively mitigated stress concentrations, preventing material failure at the interface.

Conclusions:

  • This novel hydrogel lubrication strategy provides a robust and effective method for modifying high-modulus polymer surfaces.
  • The approach successfully overcomes the inherent conflict between high load-bearing capacity and ultra-low friction.
  • The findings offer a valuable reference for the surface modification of medical interventional devices and other demanding applications.