Acoustic Control of Crystalline Particle Count
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Solution Overview
Problem
Current methods for controlling the formation of crystalline particles in solutions are limited in precision and efficiency, particularly in regulating the number and size of particles formed, as they often rely on temperature and concentration thresholds that can be difficult to manage effectively.
Innovation Solution
The use of focused acoustic energy allows for the control of crystalline particle formation by adjusting the peak incident power (PIP), enabling the generation of crystalline particles at controlled rates and sizes even below the primary and secondary nucleation thresholds, thereby precisely regulating the number of particles formed per unit volume and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If temperature and concentration thresholds are used to control crystalline particle formation, then particle formation can be initiated, but precision and efficiency in regulating the number and size of particles are limited
Solution Approach 1:
The patent applies parameter changes by transitioning from thermal parameters (temperature) to acoustic parameters (power, frequency, duty cycle) to control nucleation. The acoustic parameters provide more precise and responsive control over particle formation kinetics, enabling independent regulation of nucleation rate and crystal growth without the lag inherent in temperature-based methods.
Solution Approach 2:
The patent replaces the thermal field (temperature control) with an acoustic field (ultrasonic energy) to drive nucleation and crystal growth. This substitution enables more precise control because acoustic energy can be rapidly adjusted in power and frequency, providing immediate response to control changes without the thermal inertia that limits temperature-based methods.
2Reliability
If temperature control methods are used to regulate crystallization, then particle formation can be managed, but the response time is slow and thermal stress is generated
Solution Approach 1:
The patent replaces thermal control with acoustic control, where ultrasonic energy directly influences nucleation and crystal growth kinetics. Acoustic parameters can be adjusted instantaneously, providing rapid response time without thermal lag, while eliminating thermal stress that compromises crystal quality and process reliability.
Solution Approach 2:
The patent employs periodic ultrasonic action through pulsed or continuous wave modes at controlled frequencies. This periodic acoustic energy input creates consistent nucleation events and growth conditions, improving process reliability and predictability while the rapid on/off capability enables quick response to control adjustments.
3Quantity of substance
If traditional nucleation methods are used, then crystalline particles form at threshold levels, but control over particle count per unit volume and time is imprecise
Solution Approach 1:
The patent changes the controlling parameters from bulk properties (temperature, concentration) to localized acoustic field properties (power density, frequency, duty cycle). This enables precise regulation of nucleation rate and particle count because acoustic parameters can be independently adjusted and provide immediate feedback response, achieving accurate control over particles per unit volume and time.
Solution Approach 2:
The patent applies localized acoustic energy fields to specific regions of the crystallization system, creating controlled zones of nucleation and growth. This local quality approach allows precise spatial and temporal control over where and how particles form, enabling accurate regulation of particle count density without affecting the entire bulk solution uniformly.
4Ease of operation
If acoustic energy is used to create nucleation sites and control particle growth, then particle formation can be initiated below nucleation thresholds, but device complexity increases
Solution Approach 1:
The patent applies ultrasonic transducers that serve multiple functions: creating nucleation sites, controlling particle growth rate, and regulating final particle size. This multi-functionality reduces the need for separate control systems for each crystallization stage, simplifying overall operation despite the sophisticated physics involved. The single acoustic field manages the entire crystallization process from nucleation to growth.
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 approach enables precise and repeatable control over crystalline particle formation, allowing for the adjustment of particle count and size, which is faster and more immediate than traditional temperature control methods, and can process large volumes with minimal cross-contamination and thermal stress.
Implementation Method 1
acoustic energy has been used to create nucleation sites in a solution so as to cause crystalline particles to be formed at the nucleation sites
Implementation Method 2
primary nucleation of crystalline particles is caused at a controlled particle count generation rate
Implementation Method 3
acoustic energy can be used to influence the rate at which crystalline particles grow in solution
Implementation Method 4
acoustic energy can be used to influence the rate at which crystalline particles grow in solution
Data Source
AI summary
Methods and systems for preparing crystalline particle compositions using focused acoustic processing to control a number or count of crystalline particles generated. Peak incident power of focused acoustic energy used to cause primary nucleation kinetics of a solute may be adjusted to adjust the number or count of crystalline particles.