Stimuli-Responsive Superabsorbent Polymer Bags for Water Storage
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Solution Overview
Problem
Current superabsorbent polymers (SAPs) are not utilized effectively for harvesting, storage, and retrieval of rain, dew, or sea water, failing to replace the need for dams and canals, and they often produce contaminated water that cannot be reused.
Innovation Solution
Development of highly absorbent, stimuli-responsive SAPs with an absorbency of over 6000 times their weight, allowing for the collection, storage, and release of at least 99.95% pure water in solid/gel form, using fabric-based sachets or bags, which can be transported and stored without leakage, and released via chemical, light-induced, electrical, or thermal stimuli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional SAPs are used for water absorption, then water harvesting capability is achieved, but water purity is compromised due to contamination
Solution Approach 1:
The invention divides the water harvesting system into separate functional components: collection bags containing SAP granules are separated from the water source, and the SAP material itself is segmented into discrete particles within the bag structure. This segmentation prevents direct contact between contaminated water and the SAP, maintaining water purity while achieving harvesting capability.
Solution Approach 2:
The patent introduces fabric-based sachets and bags as intermediary containers that hold the SAP material. These intermediaries act as barriers that allow water absorption functionality while preventing contamination of the harvested water, thus resolving the contradiction between harvesting capability and water purity.
2Device complexity
If SAPs are used to replace dams and canals for water storage, then infrastructure complexity is reduced, but storage capacity and reliability are insufficient
Solution Approach 1:
The invention merges multiple functions into the SAP-based storage system: absorption, containment, transport, and controlled release all occur within integrated fabric bags. This consolidation replaces complex dam and canal infrastructure while maintaining reliable water storage capacity through the high absorbency of SAP materials.
Solution Approach 2:
The patent utilizes composite structures combining fabric materials (for containment and transport) with superabsorbent polymer granules (for water absorption and storage). This composite approach enables reliable water storage without the complexity of traditional infrastructure, as the composite material system provides both structural integrity and functional performance.
3Loss of substance
If SAPs are used for water transport, then leakage and loss are eliminated, but transport efficiency and speed are reduced
Solution Approach 1:
The invention employs dynamic control of water release through stimuli-responsive SAP materials that can transition between absorbed and released states. The fabric bags are designed to facilitate controlled discharge, allowing the system to adapt between secure containment during transport and efficient release at destination, thus maintaining both low loss and transport efficiency.
4Quantity of substance
If conventional SAP applications are used, then absorbency is achieved, but reusability and sustainability are compromised
Solution Approach 1:
The patent implements a recovery and reuse system where SAP-containing fabric bags are collected after use, the SAP material is recovered and regenerated through controlled dehydration processes, and the fabric bags are reused for subsequent harvesting cycles. This closed-loop approach maintains high absorbency performance while enabling sustained reusability.
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 solution addresses the global water crisis by enabling efficient water harvesting and storage, reducing the need for dams and canals, and providing a sustainable source of drinking water, with the potential to produce equal amounts of fresh water as 13,000 desalination plants using significantly less SAP material.
Implementation Method 1
Superabsorbent polymers (SAP) are polymers that can absorb and retain extremely large amounts of a liquid relative to its own mass
Implementation Method 2
The stored water in SAPs is released at the point of use by any stimulus which may be chemical, light-induced, electrical, thermal treatment etc.
Data Source
AI summary
Stimuli-responsive highly absorbent superabsorbent polymers (SAPs) are used to harness water to augment water supply and solve water crisis. Rain water, dew or sea water is harnessed in fabric-based sachets or bags partially filled with the polymers. The hydrated polymers are used to store water in warehouses for an extended period of time and the invention may obviate the need to construct controversial huge dams and canals or drill wells. The stored water in superabsorbent polymers is released at the point of use by any stimulus which may be light-induced, electrical, thermal or chemical treatment. SAPs with 2000 g/g of absorbency can yield 99.95% pure water in solid/gel form. An ultra SAP with absorbency of 10,000 g/g of the polymer could hold 10 billion cu·m. of water in one million tonnes of the polymer. This is more than the capacity of a typical large dam over a river.