Anionic Exchange Membrane with Phase-Separated Domains for Ion Selectivity
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Solution Overview
Problem
Existing permeable membranes in applications such as HVAC, desalination, and energy storage face limitations due to their properties and issues like fouling, energy inefficiency, and limited ion conduction capabilities, necessitating membranes with improved selectivity and durability for efficient mass transport and ion transfer.
Innovation Solution
Development of a membrane with phase-separated anionic exchange electrolyte polymers, featuring contiguous domains with electrostatically bound negative ions and covalently bound positive ions, and a flexible, elastic matrix that supports ion and mass conducting channels, allowing selective passage of high-dipole molecules and ions, and exhibiting high permittivity under DC or slowly varying AC voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional permeable membranes are used, then basic mass transport function is provided, but ion conduction capability and selectivity are limited
Solution Approach 1:
The membrane is segmented into distinct contiguous domains: hydrophilic domains containing electrostatically bound negative ions and covalently bound positive ions for ion conduction, and hydrophobic domains forming an elastic matrix for mechanical support. This segmentation enables simultaneous optimization of ion conduction capability in hydrophilic regions and mechanical stability in hydrophobic regions, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
Different regions of the membrane are赋予 different local properties: the hydrophilic contiguous domains provide high ion conduction capability and selective transport for high-dipole molecules, while the hydrophobic elastic matrix provides mechanical strength and flexibility. This local differentiation allows the membrane to achieve both superior ion conduction and molecular selectivity without compromising overall structural integrity.
2Productivity
If membrane porosity is increased to improve mass transport, then ion and molecule passage is enhanced, but mechanical strength and durability decrease
Solution Approach 1:
The membrane employs a composite structure combining hydrophilic ion-conducting domains with hydrophobic elastic matrix material. The hydrophobic matrix provides mechanical strength and durability, while the hydrophilic domains provide efficient ion and mass transport pathways. This composite approach allows high porosity and transport efficiency without sacrificing mechanical integrity, as the elastic matrix maintains structural stability even at high porosity levels.
3Reliability
If membrane thickness is increased to improve durability, then mechanical strength is enhanced, but ion and mass transport efficiency decreases
Solution Approach 1:
The membrane utilizes a porous structure with contiguous hydrophilic domains that form interconnected pathways for ion and molecule transport spanning the entire membrane thickness. These continuous porous channels maintain efficient transport even in thicker membranes, while the hydrophobic elastic matrix provides mechanical support. The porous architecture ensures that ion transport efficiency is preserved across the membrane thickness by providing direct, unobstructed pathways from one surface to the other.
4Measurement precision
If membrane selectivity is increased to improve separation performance, then specificity for target molecules is enhanced, but energy consumption increases
Solution Approach 1:
The membrane exploits changes in molecular dipole moment as a selection parameter, allowing high-dipole molecules to preferentially partition into and traverse the hydrophilic contiguous domains while low-dipole molecules are excluded. This parameter-based selection mechanism achieves high separation selectivity without requiring energy-intensive processes, as the selection is driven by thermodynamic preferences for solvation in different phases rather than active energy input.
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 membrane enables superior ion transport, water mass transport, and electrical properties, enhancing the efficiency of applications like humidification, heat and moisture exchange, and energy storage, while reducing energy consumption and maintenance costs.
Implementation Method 1
The first contiguous domain includes a plurality of repeat units having moieties with electrostatically bound negative ions and covalently bound positive ions
Implementation Method 2
molecules that are soluble in the first contiguous domain can pass between the first and second major surfaces of the membrane
Implementation Method 3
the membrane has high permittivity when exposed to DC or slowly varying AC voltages
Data Source
AI summary
The present disclosure provides a membrane having a first major surface and a second major surface and including one or more anionic exchange electrolyte polymers. The membranes can be useful for selectively mass transporting molecules and/or ions.