Load Induced Lubrication of Porous Surfaces
This technology features an elastically deformable substrate, such as a hydrogel or polymer, patterned with an array of microscale or nanoscale pores that store a fluid or gel lubricant. The pores create spaced-apart projections across the contact surface. When a compressive load is applied by an interfacing body or machine part, these compliant projections deform elastically. This deformation pressurizes and extrudes the stored lubricant directly into the contact interface, forming a hydrodynamic lubricating film. As the load shifts, relieved regions reabsorb the fluid, sustaining continuous, self-replenishing lubrication during movement.
Animal testing has successfully been performed on rabbits for an artificial knee meniscus. The data obtained shows that the polymer is biocompatible in the knee for at least 6 months and does not degrade.
This project was also awarded Tulane's Provost Proof of Concept funding for $50k to further develop the technology.
The Problem
The field of component lubrication is critical for minimizing friction and wear across applications ranging from industrial machinery to medical devices like joint replacements and catheters. In these domains, there is a fundamental need to maintain a continuous lubricating film between interacting surfaces to prevent mechanical degradation. Biological systems, such as human cartilage, naturally achieve ultra-low friction by utilizing a porous structure that pressurizes synovial fluid. Replicating this highly efficient hydrodynamic lubrication in synthetic materials is essential for extending the lifespan and improving the efficiency of mechanical and biomedical components.
Despite this need, current synthetic approaches often fail to sustain adequate lubrication under challenging operational conditions.
The Solution
This technology features an elastically deformable substrate, such as a hydrogel or polymer, patterned with an array of microscale or nanoscale pores that store a fluid or gel lubricant. The pores create spaced-apart projections across the contact surface. When a compressive load is applied by an interfacing body or machine part, these compliant projections deform elastically. This deformation pressurizes and extrudes the stored lubricant directly into the contact interface, forming a hydrodynamic lubricating film. As the load shifts, relieved regions reabsorb the fluid, sustaining continuous, self-replenishing lubrication during movement.
The Opportunity
This solution is highly differentiated because it biomimetically replicates the ultra-low friction mechanisms of natural biological cartilage, achieving hydrodynamic lubrication even at low shear velocities. Traditional flat surfaces often experience high friction and wear under slow or heavy loads, whereas this dynamic, load-induced system actively extrudes lubricant exactly where and when pressure is applied. By fluidly isolating the pores and allowing customizable substrate stiffness, pore depths, and lubricant viscosities, it dramatically reduces the coefficient of friction. This adaptable architecture provides superior, long-lasting wear protection for diverse applications ranging from medical joint replacements to industrial machinery.
