Temperature-Responsive Polymer Atmospheric Water Collection
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Solution Overview
Problem
Access to fresh water is scarce and unevenly distributed, and existing water desalination technologies are energy-intensive and costly, making it challenging to collect and purify water in arid regions without significant energy input.
Innovation Solution
A device utilizing temperature-responsive polymers like Poly(N-isopropylacrylamide) that absorbs water from atmospheric moisture at lower temperatures and expels it to a collection container at higher temperatures, driven by solar radiation, with a porous protection wall to prevent contamination and a non-absorbing water container to store the collected water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If temperature-responsive polymers are used to absorb water from atmospheric moisture, then water collection efficiency is improved with minimal energy input, but the device requires specific material properties and temperature cycling conditions
Solution Approach 1:
The patent utilizes temperature-responsive polymers that change their physical properties (swollen hydrated state below phase separation temperature, shrunken dehydrated state above phase separation temperature) in response to temperature variations. This parameter change allows the material to automatically absorb and expel water without external energy input, resolving the contradiction between minimal energy input and effective water collection
Solution Approach 2:
The temperature-responsive polymer performs the water collection and expulsion functions autonomously by responding to natural temperature cycling. The material self-regulates its water absorption and release based on temperature conditions, eliminating the need for external power sources or complex control mechanisms
2Reliability
If a porous protection wall is used to prevent contamination, then water purity is improved, but air flow resistance increases
Solution Approach 1:
The patent employs a porous protection wall that allows selective passage of air and water vapor while blocking contaminants. The porous structure provides sufficient permeability for air flow to reach the temperature-responsive polymer while preventing contamination, thus resolving the contradiction between water purity and air flow resistance
3Ease of manufacture
If solar radiation is used as the only energy source, then operational cost is reduced, but water collection rate is limited by environmental conditions
Solution Approach 1:
The patent replaces mechanical energy input systems with a passive thermal response system. The temperature-responsive polymer automatically cycles between water absorption and expulsion states in response to solar radiation-induced temperature changes, eliminating the need for pumps, heaters, or other mechanical components while maintaining water collection functionality
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 device efficiently collects water with minimal energy input, reducing costs and environmental impact, as it leverages solar radiation to operate and does not require mechanical energy or heating, making it suitable for arid regions with limited freshwater resources.
Implementation Method 1
when its temperature is below phase separation temperature, the temperature responsive polymer is in a swollen hydrated state, forming hydrogen bond with water molecules; so as to absorb water from the air
Implementation Method 2
when its temperature is above that phase separation temperature, the temperature responsive polymer is in a shrunken dehydrated state, forming hydrogen bond with other temperature responsive polymer molecules; so as to expel the water to the water container
Implementation Method 3
a device for collecting water from the atmospheric moisture with no need of energy input except for solar radiation
Data Source
AI summary
A device for collecting water from atmospheric moisture comprises water absorbing material, a protection wall and a water container. The protection wall is in a porous form. The water absorbing material is made of the temperature responsive polymer with a phase separation temperature, including Poly(N-isopropylacrylamide) (PNIPAM), Poly(vinylphosphonate) and etc. when its temperature is below phase separation temperature, the temperature responsive polymer is in a swollen hydrated state, forming hydrogen bond with water molecules; so as to absorb water from the air. When its temperature is above said phase separation temperature, the temperature responsive polymer is in a shrunken dehydrated state, forming hydrogen bond with other temperature responsive polymer molecules; so as to expel the water to the water container.