Colloidal Particle Kinetics Measurement via Light Scattering
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Solution Overview
Problem
Conventional methods for measuring nanoparticle properties in poly-disperse samples are inaccurate due to difficulties in resolving particle sizes and accounting for growth or dissolution rates, leading to errors in concentration and size distribution analysis.
Innovation Solution
A system using multiple light sources and sensors to detect electromagnetic radiation, with a processor that calculates the growth/dissolution rate by normalizing and analyzing the intensity of scattered light over time, allowing for the determination of particle kinetics through slope calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional dark field microscopy is used to measure nanoparticle properties, then the measurement process is simple, but the accuracy is poor for poly-disperse samples due to inability to resolve particle sizes and account for growth/dissolution rates
Solution Approach 1:
The patent segments the measurement process into multiple discrete steps: capturing images at different time points, calculating total light intensity for each image, normalizing intensities, and determining slopes. This temporal segmentation allows the system to track particle growth/dissolution kinetics while maintaining measurement accuracy for poly-disperse samples without requiring complex hardware modifications.
Solution Approach 2:
The patent performs preliminary normalization of light intensity values by the maximum intensity in the sequence before calculating slopes. This preliminary action removes the confounding effect of varying particle concentrations and sizes, enabling accurate kinetic measurements without requiring complex real-time calibration during the measurement process.
2Productivity
If light scattering from all nanoparticles is measured simultaneously, then the measurement is quick, but it is difficult to resolve nanoparticles into constituent sizes when there is a range of particle sizes
Solution Approach 1:
The patent implements continuous monitoring by capturing multiple images at different time points and analyzing the temporal evolution of total light intensity. This continuous measurement approach maintains high productivity while enabling resolution of particle size distribution through kinetic analysis, as different sized particles exhibit characteristic growth or dissolution rates that can be distinguished by their intensity trajectories.
Solution Approach 2:
The patent uses feedback from the temporal changes in light intensity to infer particle size distribution characteristics. By analyzing how the total intensity evolves over time and calculating slopes between consecutive images, the system gains information about particle kinetics that reveals size distribution without requiring direct spatial resolution of individual particles.
3Loss of time
If snapshots of size distribution are taken, then the measurement is fast, but the concentration and size distribution become inaccurate a few moments later due to particle growth or dissolution
Solution Approach 1:
The patent employs periodic imaging at defined time intervals to capture the temporal evolution of particle properties. This periodic measurement strategy transforms the limitation of snapshot measurements into an advantage by systematically sampling the particle population over time, enabling calculation of growth/dissolution rates while maintaining measurement speed through automated image capture and processing.
Solution Approach 2:
The patent maintains continuous measurement action by automatically capturing multiple images at successive time points and processing them through a standardized analysis pipeline. This continuous action eliminates the gap between measurements that would allow particle properties to change undetected, as the system continuously monitors and records intensity changes, enabling accurate determination of both initial concentration and kinetic parameters.
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 effectively measures the growth/dissolution kinetics of colloidal particles, providing accurate size distribution and concentration data, which is crucial for industrial applications such as pharmaceuticals and drug delivery.
Implementation Method 1
A light source is constructed to emit a beam of electromagnetic radiation at a specimen chamber that holds the colloidal particles. The chamber allows a portion of the combined beam to scatter. The scattered portion of the beam is directed to a sensor that detects electromagnetic radiation.
Data Source
AI summary
A system for determining the growth/dissolution rate of colloidal particles is disclosed and includes multiple light sources and multiple sensors. A light source is constructed to emit a beam of electromagnetic radiation at a specimen chamber that holds the colloidal particles. The chamber allows a portion of the combined beam to scatter perpendicularly or at some other angle to the combined beam. The scattered portion of the beam is directed to a sensor that detects electromagnetic radiation. The sensor is connected to processor that activates the light source and obtains an image from the sensor. Multiple images are taken at a time interval and for each image taken, and a total image intensity level is calculated and normalized. A formula is then calculated that fits the normalized values over time and a slope is determined from the formula.