Hydrophobic Silica Aerogel Blanket With Diffusion Holes
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Solution Overview
Problem
Existing aerogel blankets face challenges in achieving uniform surface modification and maintaining high hydrophobicity due to poor diffusion of surface modifiers, leading to degraded thermal insulation performance and structural instability.
Innovation Solution
The introduction of holes with specific diameters and aspect ratios on the aerogel blanket surface facilitates the diffusion of surface modifiers, allowing for simultaneous solvent substitution and surface modification in one step, thereby improving hydrophobicity and thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface modification is performed on aerogel blanket after fiber impregnation, then the aerogel blanket gains hydrophobic properties, but the surface modifier diffusion is hindered resulting in low surface modification efficiency
Solution Approach 1:
The patent creates holes in the fiber blanket before aerogel impregnation and surface modification. This preliminary structural modification facilitates subsequent surface modifier diffusion into the aerogel pores, resolving the contradiction by preparing the diffusion pathway in advance rather than encountering the dense fiber-aerogel composite barrier during the modification process itself
2Reliability
If aerogel is used for thermal insulation, then excellent insulation properties are achieved, but the complex preparation process and high cost limit its application
Solution Approach 1:
The patent combines multiple functions into the fiber blanket structure: the fibers provide mechanical strength and structural support, while the aerogel impregnated within the fiber network provides thermal insulation. This composite structure achieves excellent insulation performance while simplifying the overall system compared to using dense aerogel alone
Solution Approach 2:
The patent utilizes the porous structure of aerogel and incorporates it into a fiber matrix. The aerogel's high porosity (90-99.9%) provides superior thermal insulation through trapped air pockets, while the fiber framework maintains structural integrity and enables practical processing and handling
3Reliability
If aerogel is used for thermal insulation, then excellent insulation properties are achieved, but the high porosity results in very poor mechanical strength
Solution Approach 1:
The patent creates a composite material where aerogel particles or gel is impregnated within a fiber blanket matrix. The fiber component (such as glass fibers, ceramic fibers, or organic fibers) provides the mechanical strength and structural framework, while the aerogel phase provides the thermal insulation function. This composite structure synergistically combines the advantages of both materials
Solution Approach 2:
The fiber blanket acts as a flexible matrix that can be woven or non-woven into various configurations, providing both mechanical support and adaptability for different applications. The aerogel impregnated within this flexible fiber network maintains insulation performance while gaining the flexibility and handleability of the fiber structure
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 method enhances surface modification efficiency, maintains high hydrophobicity, and ensures excellent thermal insulation performance by facilitating the diffusion of surface modifiers through controlled hole formation, resulting in improved productivity and economic feasibility.
Implementation Method 1
the diffusion of a surface modifier is not facilitated, so that there is a problem in that surface modification efficiency is relatively low
Implementation Method 2
an aerogel has super-insulation properties exhibiting a thermal conductivity of 0.300 W/m·K or less
Implementation Method 3
there is a problem in that hydrophobicity is easily lost during high temperature firing of 400° C. or higher
Data Source
AI summary
A hydrophobic silica aerogel blanket including holes, so that the diffusion of a surface modifier is facilitated in a blanket during a surface modification process to improve the efficiency of surface modification. Accordingly, the hydrophobic silica aerogel has not only excellent physical properties such as specific surface area and thermal conductivity, but also a controlled degree of hydrophobicity, and thus, can have high hydrophobicity.