Aerogel Ambient Pressure Drying via Ion Exchange Gelation
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Solution Overview
Problem
Current aerogel production methods face challenges such as shrinkage and cracking due to differential capillary pressure and pore collapse when dried under non-ambient pressures, leading to high costs and long processing times, and result in low-density materials.
Innovation Solution
A method involving the use of ion exchange to convert silicate salts into silicic acid, combined with catalysts and abradants, to induce gelation and drying at ambient pressure in a fluidized chamber, reducing capillary stresses and maintaining porosity through pseudo fluidic drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aerogels are dried under non-ambient pressures (super-critical or sub-critical drying), then the liquid component can be removed without causing pore collapse, but the process requires high pressure equipment and excessive time
Solution Approach 1:
The patent changes the pressure parameter from non-ambient (high pressure for super-critical or sub-critical drying) to ambient pressure drying. This is achieved by modifying the gelation process to create a more robust gel structure that can withstand capillary pressures at ambient conditions, thereby eliminating the need for high-pressure equipment and reducing drying time while maintaining pore structure integrity
Solution Approach 2:
The patent applies preliminary action by optimizing the gelation process before drying. Specifically, it uses controlled hydrolysis and condensation reactions to form a denser, more mechanically stable gel network in advance. This pre-strengthening of the gel structure allows it to resist capillary collapse during subsequent ambient pressure drying, resolving the contradiction between maintaining pore integrity and reducing drying time
2Loss of substance
If xerogels and alcogels are dried under pressurized conditions, then the liquid can be removed, but shrinkage and cracking occur due to differential capillary pressure and pore collapse
Solution Approach 1:
The patent changes the pressure parameter from pressurized conditions to ambient pressure drying. By creating a gel structure with enhanced mechanical properties through controlled gelation chemistry, the material can tolerate the capillary pressures generated during liquid removal at ambient conditions without shrinking or cracking, thus achieving both effective liquid removal and structural integrity
Solution Approach 2:
The patent employs composite material strategies by incorporating cross-linked network structures and potentially hybrid organic-inorganic components that enhance the gel's mechanical strength. This composite approach creates a more resilient gel matrix that resists capillary-induced stresses during drying, preventing shrinkage and cracking while maintaining porosity
3Ease of manufacture
If current aerogel production methods are used, then aerogels can be manufactured, but high costs and long processing times hold back production
Solution Approach 1:
The patent changes multiple parameters simultaneously: pressure (from high to ambient), temperature (optimizing for faster gelation), and chemistry (using cost-effective precursors and catalysts). These parameter changes collectively reduce equipment requirements, shorten processing times, and lower material costs, thereby improving both ease of manufacture and productivity
Solution Approach 2:
The patent adopts simpler, less expensive equipment and materials that can be used for aerogel production. By replacing costly high-pressure apparatus with ambient pressure drying setups and using economical gelation chemistry, the process becomes more accessible and scalable, significantly improving production efficiency while maintaining product quality
Data Source
AI summary
An exemplary embodiment of the present disclosure provides a method for manufacturing an aerogel. The method may include mixing a silicate salt with a solution to obtain a sol-gel. The method may include conditioning the sol-gel with one or more abradants to obtain an aerogel product.