Microporous Dry Adhesive Films With Switchable Surface Roughness
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Solution Overview
Problem
There is a need for materials that can adhere to most common solid surfaces without the use of lubricants, inspired by the adhesion mechanics of gecko's feet, and can switch between different adhesion states.
Innovation Solution
A method involving the fabrication of a porous polymer material with switchable adhesion, achieved by creating an ordered array of voids in a polymer framework using nanoparticles and shape memory polymerizable material, which can be transitioned between states through stimuli such as water and solvents, altering surface roughness and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a material is designed to adhere to most common solid surfaces without lubricants, then adhesion capability is improved, but the material complexity increases
Solution Approach 1:
The patent employs a porous polymer framework with ordered voids created by removing nanoparticles. This porous structure enables dry adhesion by providing increased surface area and mechanical interlocking capability with substrates, eliminating the need for lubricants while maintaining material simplicity
Solution Approach 2:
The patent creates a composite structure combining polymer matrix with embedded nanoparticles that are subsequently removed to form voids. This composite approach allows the material to exhibit both structural integrity and switchable adhesion properties through the hierarchical porous architecture
2Adaptability or versatility
If a material is designed to switch between different adhesion states, then adaptability is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent incorporates shape memory polymer functionality that allows the material to dynamically switch between adherent and non-adherent states in response to external stimuli such as temperature changes. This dynamic behavior is achieved through the polymer's ability to reversibly change its molecular structure, enabling on-demand adhesion control
Solution Approach 2:
The manufacturing process pre-establishes the porous framework and shape memory characteristics during fabrication, so that the switchable adhesion capability is inherently built into the material structure before use. This preliminary structuring simplifies the operational complexity by eliminating the need for additional actuation mechanisms
3Manufacturing precision
If nanoparticles are used to create ordered voids in a polymer framework, then adhesion control is improved, but the manufacturing steps increase
Solution Approach 1:
The patent uses nanoparticles as temporary intermediary structures during fabrication. These nanoparticles are embedded in the polymer matrix and then selectively removed to create the desired void pattern. This intermediary approach allows precise control over void size, shape, and distribution without requiring direct fabrication of the porous structure
Solution Approach 2:
The removal of nanoparticles creates a porous polymer framework with ordered voids that provide controlled adhesion properties. The porous structure is directly formed through the negative space left by the removed particles, enabling precise adhesion control through void geometry and distribution
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The material exhibits reversible adhesion changes, allowing for tunable gripping and adhesive properties, with visible color changes indicating the adhesion state, and can adhere to various surfaces without chemicals, suitable for applications like soft robotics and consumer adhesives.
Implementation Method 1
The shape memory polymerizable material can be polymerized to form a polymer framework around the particles
Implementation Method 2
The polymer framework can be exposed to oxygen plasma etching
Implementation Method 3
A porous polymer material having switchable adhesion, where the porous polymer material includes a shape memory polymeric material having ordered voids. The porous polymer material has a starting state, a deformed state, and a recovered state
Data Source
AI summary
Provided herein are materials, methods of making materials, and methods of use, wherein the materials have switchable adhesive properties. Materials of the present disclosure can reversibly change coloration in conjunction with the changing adhesive state. The films, made from a porous polymer material, can be reversibly changed from a smooth state to a rough state, allowing for reversible and tunable gripping and/or adhesive properties.