Torque-Monitored Sol-Gel Process for Inorganic Particulate Material
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Solution Overview
Problem
Current methods for producing inorganic particulate materials, such as mesoporous silica, lack control over particle size and distribution, relying on human observation of phase separation, which is prone to variability and error.
Innovation Solution
Continuous stirring during the sol-gel process, monitored by torque changes, allows for precise control of reaction conditions and particle size, eliminating the need for visual determination of phase separation and subsequent size classification steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If visual determination of phase separation is used, then particle size can be controlled, but operator variability and measurement precision deteriorate
Solution Approach 1:
The patent replaces the visual/mechanical observation system with an automated torque measurement system. The torque of the stirring mechanism is monitored to detect phase separation, substituting human visual judgment with an objective mechanical measurement that provides consistent, quantifiable data regardless of operator variability.
Solution Approach 2:
The patent implements a feedback control system where torque measurements are continuously monitored and used to determine the optimal moment for stirring. This feedback loop allows automatic adjustment of the process based on real-time measurements, improving both measurement precision and manufacturing precision simultaneously.
2Ease of operation
If stirring is stopped during sol-gel process, then phase separation can be observed visually, but productivity and consistency deteriorate
Solution Approach 1:
The patent replaces the need to stop mechanical stirring with continuous torque monitoring. The stirring mechanism remains operational throughout the process, and phase separation is detected through changes in torque characteristics, eliminating production interruptions while maintaining observation capability.
Solution Approach 2:
The patent enables continuous stirring throughout the entire sol-gel process without interruption. The useful action of stirring is maintained continuously, and phase separation detection is achieved through continuous torque monitoring rather than visual inspection requiring process pause, thereby improving productivity and consistency.
3Manufacturing precision
If size classification steps are added, then particle size distribution improves, but device complexity and manufacturing time increase
Solution Approach 1:
The patent performs preliminary action by determining the optimal stirring time for phase separation in advance through torque measurement. This pre-determined timing allows direct production of particles with desired size distribution without requiring subsequent classification steps, simplifying the overall process and reducing device complexity.
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 ensures consistent particle size and distribution, reducing operator variability and improving the production efficiency of inorganic particulate materials with controlled porosity for drug delivery and tissue engineering applications.
Implementation Method 1
dissolving a water-soluble polymer or another pore forming agent and a precursor for a matrix dissolving agent in a medium that promotes the hydrolysis of the organometallic compound
Implementation Method 2
solidifying the mixture through a sol-gel transition, whereby particles are prepared which have three dimensional interconnected phase domains
Implementation Method 3
removing the solvent by evaporation drying and/or heat-treatment
Data Source
Figure 1
AI summary
The present invention relates to a process for producing inorganic particulate material, the material obtainable by such process, a modified release delivery system comprising the material and the use of the material for the administration of a bioactive agent.