Core-Shell Chloride Salt Particles for Cloud Seeding
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Solution Overview
Problem
Current cloud seeding methods using uncoated chloride salt particles are inefficient in water vapor adsorption and precipitation formation, as they require high water vapor pressure and have limited hygroscopic properties.
Innovation Solution
Development of core-shell particles with a chloride salt core (sodium chloride or potassium chloride) and a titanium dioxide or silicon dioxide shell, which enhance water vapor adsorption capacity and hygroscopicity, allowing for more efficient water droplet formation and precipitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uncoated chloride salt particles are used for cloud seeding, then the particles can be easily manufactured and applied, but they have limited water vapor adsorption capacity and require high water vapor pressure to form precipitation
Solution Approach 1:
The invention uses composite core-shell particles consisting of a chloride salt core (sodium chloride or potassium chloride) coated with a hydrophilic shell material (titanium dioxide, silicon dioxide, or zinc oxide). This composite structure combines the ease of manufacture and cloud seeding effectiveness of chloride salts with the enhanced water vapor adsorption capacity of hydrophilic oxides, resolving the contradiction between manufacturing simplicity and adsorption performance.
2Device complexity
If uncoated chloride salt particles are used, then the particle structure remains simple, but the hygroscopic properties are insufficient for efficient precipitation formation
Solution Approach 1:
The invention applies local quality by coating only the surface of the chloride salt particles with hydrophilic oxide materials. The core maintains the original chloride salt properties while the shell provides enhanced hygroscopicity. This localized modification improves water vapor adsorption without fundamentally changing the overall particle structure or requiring complete restructuring of the material.
3Productivity
If chloride salt particles with enhanced water vapor adsorption are developed, then precipitation formation efficiency increases, but the manufacturing process becomes more complex
Solution Approach 1:
The invention changes the surface chemical parameters of the chloride salt particles by coating them with hydrophilic oxide materials. This parameter change (adding surface hydrophilicity) significantly enhances water vapor adsorption capacity and precipitation formation efficiency. The coating process can be implemented through simple methods such as mixing, spraying, or chemical vapor deposition, which do not require fundamentally new manufacturing equipment or processes.
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 core-shell particles demonstrate significantly increased water vapor adsorption capacity, up to 129 times that of pure chloride salt particles, facilitating more efficient rain formation and precipitation even at lower water vapor pressures.
Implementation Method 1
the shell comprises titanium dioxide and/or silicon dioxide... significantly increased water vapor adsorption capacity
Implementation Method 2
facilitating more efficient rain formation and precipitation even at lower water vapor pressures
Data Source
AI summary
Described herein are coated chloride salt particles, including NaCl/TiO2 and NaCl/SiO2 core/shell particles, along with methods of making and using the same.