Single-Piece Droplet Generator for Serial Crystallography
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Solution Overview
Problem
In serial femtosecond crystallography (SFX) with X-Ray free electron lasers (XFELs), large amounts of sample are required due to the destruction of crystal samples with each X-ray pulse, leading to significant waste between pulses, which limits the efficiency of sample preparation.
Innovation Solution
A single-piece hybrid droplet generator and nozzle component is used to generate a stream of segmented aqueous droplets in a carrier fluid, synchronized with the pulse rate of the X-ray beam, reducing sample waste by controlling the timing of sample droplets using electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous injection of crystal suspension is used to replenish samples between X-ray pulses, then the X-ray diffraction data collection can proceed, but up to 99% of the protein sample is wasted between pulses
Solution Approach 1:
The patent implements periodic droplet generation synchronized to the X-ray laser pulse frequency. Aqueous droplets containing crystal samples are generated only during the X-ray pulse on-time, creating a periodic injection pattern that matches the pulsed nature of the XFEL. This eliminates continuous sample injection during off-times, reducing sample waste from 99% to near-zero while maintaining data collection capability.
Solution Approach 2:
The system pre-synchronizes droplet generation timing with the X-ray pulse sequence before injection. By using trigger signals from the XFEL system, droplets are prepared and injected in advance of each pulse at precisely timed intervals, ensuring samples are present only when needed for diffraction measurement, thereby avoiding waste during off-times.
2Quantity of substance
If large amounts of sample are required for continuous injection stream, then complete X-ray diffraction data set can be collected, but sample preparation becomes a major limiting factor
Solution Approach 1:
By switching from continuous to periodic droplet injection synchronized with X-ray pulses, the total sample consumption is reduced from grams to milligrams or microliters. This dramatic reduction in required sample quantity simplifies sample preparation procedures and removes the major limiting factor of sample availability and preparation complexity.
Solution Approach 2:
The continuous sample stream is segmented into discrete aqueous droplets separated by carrier fluid. This segmentation allows precise control over sample delivery, enabling the system to inject only the necessary amount of sample in controlled portions, thereby reducing total sample requirements and simplifying preparation.
3Ease of operation
If crystal samples are delivered during the off-time between pulses, then the continuous injection stream maintains sample flow, but the samples are wasted due to the pulsed nature of XFELs
Solution Approach 1:
The injection system operates periodically rather than continuously, generating and injecting droplets only during X-ray pulse on-times. The droplet generation frequency is matched to the XFEL pulse repetition rate, creating a synchronized pattern where samples are delivered exclusively during productive periods, eliminating waste during off-times while maintaining operational simplicity.
Solution Approach 2:
The system dynamically adjusts the injection timing and frequency of droplets to match the varying pulse structure of the XFEL. By using real-time trigger signals from the XFEL system, the droplet generation is dynamically synchronized to pulse arrivals, ensuring samples are present only when needed and eliminating static continuous injection that causes waste.
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 solution significantly reduces sample waste by ensuring that only synchronized droplets reach the X-ray beam, thereby optimizing the use of the sample and enhancing the efficiency of SFX experiments.
Implementation Method 1
The electrodes are configured to provide an electric current to a stream of segmented aqueous droplets in a carrier fluid flowing through the junction
Data Source
AI summary
A single-piece hybrid droplet generator and nozzle component for serial crystallography. The single-piece hybrid droplet generator component including an internally-formed droplet-generation channel, an internally-formed sample channel, a nozzle, and a pair of electrode chambers. The droplet-generation channel extends from a first fluid inlet opening to the nozzle. The sample channel extends from a second fluid inlet opening to the droplet-generation channel and joins the droplet-generation channel at a junction. The nozzle is configured to eject a stream of segmented aqueous droplets in a carrier fluid from the droplet-generation channel through a nozzle opening of the single-piece component. The pair of electrode chambers are positioned adjacent to the droplet-generation channel near the junction between the droplet-generation channel and the sample channel. The timing of sample droplets in the stream of fluid ejected through the nozzle is controlled by applying a triggering signal to electrodes positioned in the electrode chambers of the single-piece component.