Selenium Nanoparticle Yield via Spray Drying Reduction
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Solution Overview
Problem
Existing methods for producing elemental selenium nanoparticles face inefficiencies in yield due to the lack of effective reduction of sodium selenite during the drying process, with spray drying being misunderstood as solely removing water without contributing to chemical reactions.
Innovation Solution
Incorporating a spray drying step in the process using organic compounds like amino acids or proteins, which undergo thermal decomposition, capturing electrons to reduce residual sodium selenite and increase the yield of elemental selenium nanoparticles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spray drying is used to remove water from the reaction medium, then the nanoparticle powder can be isolated, but the yield of elemental selenium nanoparticles is limited due to incomplete reduction of sodium selenite
Solution Approach 1:
The invention changes the physical parameters of the drying process by using spray drying at controlled temperatures (50-150°C) and residence times (0.1-10 seconds) to create conditions where thermal decomposition occurs. This transforms the drying process from a simple water removal operation into a chemical reaction process that reduces sodium selenite to elemental selenium, thereby improving nanoparticle yield while minimizing residual sodium selenite.
Solution Approach 2:
The spray drying process continuously exposes the liquid droplets to high temperature conditions during the atomization and drying phases, maintaining the reduction reaction throughout the entire drying process rather than as a separate step. This continuous thermal action ensures complete reduction of sodium selenite while efficiently removing water, resolving the contradiction between water removal and nanoparticle yield improvement.
2Loss of substance
If conventional drying methods are used, then water removal is achieved, but the process is time-consuming and does not contribute to chemical reduction
Solution Approach 1:
The spray drying technique rapidly passes the liquid droplets through the high-temperature zone in a matter of seconds (0.1-10 seconds residence time), skipping the prolonged drying period required by conventional methods. This rapid passage achieves both efficient water removal and simultaneous chemical reduction, eliminating the time penalty associated with conventional drying while maintaining water removal effectiveness.
3Reliability
If macromolecules are used as reducing agents, then stable nanoparticles are formed, but the complexity of the process increases
Solution Approach 1:
The invention extracts and utilizes the reducing capability inherent in simple organic compounds during the spray drying process, separating this chemical function from the stabilizing function. The organic compound serves as the reducing agent during thermal decomposition, while the nanoparticle stability is maintained by the physical conditions of spray drying and the presence of residual organic species, eliminating the need to use complex macromolecules for both functions simultaneously.
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 process significantly enhances the yield of elemental selenium nanoparticles by over 20%, transforming more than 60% of sodium selenite into elemental selenium during the atomization phase, improving the product's refinement and efficiency.
Implementation Method 1
the drying of nanoparticles might not simply be a matter of water removal but could, under certain conditions, significantly increase the nanoparticle yield. Studying this unexpected phenomenon, they found that a reduction in residual sodium selenite could occur during drying
Implementation Method 2
a reduction in residual sodium selenite could occur during drying, which actually leads to an increase in the amount of elemental selenium nanoparticles produced
Implementation Method 3
Hot spray drying involves the rapid removal of water from a liquid sample to transform it into a powder
Data Source
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AI summary
The invention relates to elemental selenium nanoparticles, especially a product containing selenium nanoparticules, that can be produced from at least one organic compound and at least one selenium source, with a step of drying by atomisation. The invention also relates to a method for producing such a product and to a method for enriching, with elemental selenium nanoparticles, a product which already comprises elemental selenium nanoparticles.