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Updated: Aug 6, 2026
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Published on: April 5, 2022
Precisely Timed On-Demand Droplet Ejection and Collision in Free Space for Controlled Reaction Initiation
Hao Deng1,2, Jacek J Jasieniak2, Tuncay Alan1
1Dynamic Micro Devices Laboratory, Mechanical and Aerospace Engineering, Monash University, Melbourne, Australia.
Small (Weinheim an Der Bergstrasse, Germany)
|August 5, 2026
Summary
Researchers developed a new droplet ejection platform for precise, synchronized chemical reactions in free space. This technology enables time-resolved studies in structural biology, chemistry, and materials science with microsecond accuracy.
Area of Science:
- * Structural biology
- * Chemistry
- * Materials Science
Background:
- * Precise initiation and synchronization of chemical reactions in free space are critical for time-resolved studies.
- * Current methods using liquid jets or drop-on-demand systems lack reliable temporal control and synchronization capabilities.
- * Femtosecond resolution probes are limited by the ability to trigger, mix, and deliver nano-to-picoliter liquid samples with deterministic control.
Purpose of the Study:
- * To present a novel acousto-pneumatic droplet ejection platform for controlled chemical reactions.
- * To enable deterministic, synchronized droplet collisions for initiating reactions in flight.
- * To overcome limitations of existing technologies for time-resolved experiments.
Main Methods:
- * Development of an acousto-pneumatic platform for droplet ejection.
- * On-demand delivery of single sub-nanoliter droplets with microsecond timing accuracy.
- * Synchronization of droplet ejection to external signals up to 100 Hz repetition rate.
- * Mid-air droplet collisions for reaction initiation at the probe.
Main Results:
- * Achieved microsecond timing accuracy and reproducible droplet trajectories.
- * Demonstrated deterministic one-drop-per-trigger operation synchronized to external signals.
- * Enabled reaction initiation via mid-air droplet collisions compatible with X-ray free-electron lasers.
- * Provided a programmable platform for high-resolution, time-resolved experimentation.
Conclusions:
- * The acousto-pneumatic platform offers precise control over reaction initiation and synchronization.
- * This technology enhances capabilities for ultrafast X-ray studies and precision nanoliter dispensing.
- * It addresses key challenges in time-resolved studies across multiple scientific disciplines.
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