Hydrogel Microstructure Arrays via Breath Figure Templating
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Solution Overview
Problem
Current methods for creating hierarchical nano-on-micro structures on hydrogels, particularly protein hydrogels, are limited due to incompatibility with heat-sensitive molecules and result in inconsistent, anisotropic wrinkle patterns, which are not suitable for biomedical applications requiring reproducibility and biocompatibility.
Innovation Solution
The development of a breath figure templating method using polystyrene microporous templates to create ordered, shape-controllable rounded microscale structures on hydrogels, allowing for the incorporation of nanogels and heat-sensitive molecules, resulting in hierarchical nano-on-micro structures with tunable sphericity and roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shrinking method is used to create hierarchical structures on hydrogels, then the manufacturing process is simple and does not require specialized infrastructure, but the method cannot be applied to protein hydrogels or hydrogels containing heat-sensitive biological agents
Solution Approach 1:
The patent replaces the thermal shrinking method with a photo-lithographic approach using UV light exposure and photopolymerization. This substitution allows for precise mechanical patterning of microstructures without applying heat, thereby enabling the use of heat-sensitive protein hydrogels and biological agents while maintaining manufacturing feasibility.
Solution Approach 2:
The patent introduces a photoresist layer and UV light exposure as intermediaries to transfer micro patterns from a master mold to the hydrogel surface. This intermediary approach enables precise pattern transfer without direct thermal contact, protecting heat-sensitive components while achieving the desired hierarchical structures.
2Ease of manufacture
If the shrinking method is used to create wrinkle micropatterns on hydrogels, then the process is simple, but the wrinkles are anisotropic and disordered, which reduces consistency and reproducibility
Solution Approach 1:
The patent creates a master mold with pre-defined micro patterns before transferring them to the hydrogel surface. This preliminary action ensures that the desired isotropic and ordered microstructure pattern is established in advance, which is then replicated with high consistency and reproducibility during the photo-lithographic transfer process.
Solution Approach 2:
The patent uses photo-lithography to create a precise copy of the master mold's micro patterns onto the hydrogel surface. This copying process ensures that the microstructures are isotropic and ordered, matching the master mold's design with high fidelity, thereby achieving consistent and reproducible results across multiple samples.
3Adaptability or versatility
If photolithography combined with in situ photopolymerization is used to micropattern hydrogels, then design flexibility for various microstructures is achieved, but the method is incompatible with proteins and other heat-sensitive molecules
Solution Approach 1:
The patent replaces thermal processing with UV light-based photopolymerization and photo-lithographic patterning. This substitution eliminates heat exposure that would damage proteins and heat-sensitive molecules, while maintaining the ability to create diverse microstructure designs through photomask patterns and master mold geometries.
4Area of stationary object
If hierarchical nano-on-micro structures are created on hydrogels, then surface area is increased and surface energy is changed, but the manufacturing process becomes more complex
Solution Approach 1:
The patent segments the manufacturing process into distinct steps: creating a master mold with micro patterns, applying a photoresist layer, exposing to UV light for pattern transfer, and removing the mold. This segmentation allows for systematic control of each step, managing overall process complexity while achieving the desired hierarchical nano-on-micro structures that increase surface area.
Solution Approach 2:
The patent uses a photoresist layer and UV light exposure as intermediaries to transfer micro patterns from the master mold to the hydrogel surface. This intermediary approach enables precise pattern transfer without requiring direct modification of the hydrogel, thereby managing manufacturing complexity while achieving hierarchical structures with increased surface area.
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
This approach produces hydrogels with enhanced surface hydrophilicity and bacteria repellency, significantly inhibiting the long-term attachment of multidrug-resistant Staphylococcus aureus, making them suitable for applications in wound care and surgical sealants.
Implementation Method 1
breath figure templating method using polystyrene microporous templates to create ordered, shape-controllable rounded microscale structures
Implementation Method 2
the structures exhibit increased surface hydrophilicity and bacteria repellency as compared to a flat hydrogel surface
Data Source
AI summary
This disclosure relates to a hydrogel comprising a crosslinked biomolecule, wherein the hydrogel comprises microscale structures. Also described is a hydrogel comprising an ordered array of semi-spherical microbumps, wherein the hydrogel is bacteria-repellent. Also described is a hierarchically-structured protein hydrogel that inhibits long term attachment of multidrug resistant Staphylococcus aureus up to 100× over a flat hydrogel. Methods of making and uses thereof are also disclosed herein.