Nanocomposite Gel Drying via Phase Boundary Avoidance
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Solution Overview
Problem
Existing methods for producing nanocomposites with porous monolithic inorganic gel structures are complex, costly, and environmentally unfriendly, particularly due to the use of supercritical drying which involves multiple process steps and can damage the structure.
Innovation Solution
A process involving mixing silica and metal compounds in an aqueous solution, adjusting the pH, allowing gelation to form a hydrogel, and then drying it at a temperature and pressure that avoids boiling of the aqueous phase, resulting in a nanocomposite with a porous monolithic inorganic gel structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If supercritical drying is used to remove aqueous phase, then the porous structure is preserved, but the process becomes complex and costly
Solution Approach 1:
The patent extracts the harmful aspect of supercritical drying (high pressure and temperature requirements) while keeping the beneficial outcome (porous structure preservation). It replaces the complex supercritical drying process with a simpler drying approach that avoids phase boundary crossing, thereby maintaining structural integrity without the associated complexity
Solution Approach 2:
The patent changes the drying parameters by avoiding the supercritical region entirely. Instead of using high pressure and temperature combinations that lead to supercritical state, it employs a drying method that removes aqueous phase without crossing the liquid-gas boundary, thus simplifying the process while preserving the porous monolithic structure
2Reliability
If supercritical drying is used to remove aqueous phase, then the porous structure is preserved, but the process becomes costly and environmentally unfriendly
Solution Approach 1:
The patent replaces expensive supercritical drying equipment and consumables with a simpler, more economical drying process. The method eliminates the need for specialized high-pressure equipment and expensive supercritical fluids, reducing manufacturing costs while maintaining the desired porous structure
Solution Approach 2:
The patent converts the harmful effects of conventional drying (surface tension breaking delicate structures) into a beneficial process by avoiding phase boundary crossing entirely. The simplified drying method maintains structural integrity without requiring complex equipment or expensive materials
3Ease of manufacture
If conventional evaporation is used to remove liquid, then the process is simple, but the solid matrix collapses from capillary action
Solution Approach 1:
The patent applies prior cushioning by preventing capillary action before it can damage the structure. By controlling the drying process to avoid rapid liquid removal and maintaining appropriate pressure conditions, it prevents the collapse that would otherwise occur during evaporation, thus preserving structural integrity while keeping the process simple
4Reliability
If freeze-drying is used to avoid surface tension damage, then delicate structures are preserved, but the process becomes complex and some structures are still disrupted
Solution Approach 1:
The patent inverts the conventional approach by not focusing on how to remove liquid through phase change (freezing or supercritical drying), but rather by controlling the drying process to avoid phase boundary crossing entirely. This inversion leads to a simpler process that preserves structure without requiring complex freeze-drying equipment
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 method simplifies the production of nanocomposites, reduces costs and environmental impact, and improves the structural properties of the porous solid structure, including increased durability and photocatalytic effects.
Implementation Method 1
allowing gelation to form a hydrogel comprising an aqueous phase and a porous solid structure
Implementation Method 2
drying the hydrogel at a temperature and pressure combination that avoids boiling of the aqueous phase
Data Source
AI summary
The present invention relates to a process for providing a nanocomposite, the process comprising the steps of (i) mixing a silica compound with one or more metal compounds in an aqueous solution providing a homogenous mixture; (ii) adjusting the pH of the homogenous mixture providing a pH-adjusted homogenous mixture; (iii) allowing pH-adjusted homogenous mixture silica to undergo a gelation process resulting in a hydrogel comprising an aqueous phase and an porous solid structure; (iv) Drying the hydrogel at a temperature and pressure combination that avoids boiling of the aqueous phase, providing the nanocomposite; wherein the nanocomposite provided may have a porous monolithic inorganic gel structure comprising a silica compound and one or more metal compounds.