Phase Change Microdroplets
Phase Change Microdroplets - Related Videos
03:20
Real-Time Monitoring of Bacterial Growth Using a Microfluidic Microdroplet Culture System
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2025
Source: Jian, X. et. al., Automated Microbial Cultivation and Adaptive Evolution using Microbial Microdroplet Culture System (MMC). J. Vis. Exp. (2022)This video demonstrates the use of a microfluidic droplet-based platform for real-time monitoring of bacterial growth. By generating uniform droplets containing bacterial suspensions and guiding them through a detection pathway, the system enables continuous optical measurement of cell density to construct a growth curve.
08:20
Capillary-based Centrifugal Microfluidic Device for Size-controllable Formation of Monodisperse Microdroplets
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Cited by 9 •
2016
Here, we demonstrate a simple production method for size-controllable, monodisperse, water-in-oil (W/O) microdroplets using a capillary-based centrifugal microfluidic device. This method requires only a small sample volume and enables high-yield production. We expect this method will be useful for rapid biochemical and cellular analyses.
03:42
Adaptive Evolution of Bacteria Using a Microbial Microdroplet Culture System
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2025
Source: Jian, X., et al., Automated Microbial Cultivation and Adaptive Evolution using Microbial Microdroplet Culture System (MMC). J. Vis. Exp. (2022).This video demonstrates the use of a microbial microdroplet culture system to drive adaptive evolution of bacteria toward methanol tolerance. By mixing engineered bacterial cultures with a high-methanol stress medium and segmenting them into microdroplets, the system selects for mutants that exhibit improved growth under methanol stress. Through...
07:59
Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets
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Cited by 1 •
2021
In this protocol, methods for synthesizing and characterizing multi-modal phase-change porphyrin droplets are outlined.
02:39
Phase Diagrams
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2020
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
FAQs
Nucleation determines when a droplet actually begins vaporizing or condensing after reaching a supersaturated or metastable state. A temperature increase or pressure decrease can move the liquid toward vaporization, but the transition depends on formation of a stable new phase. Because confinement can alter nucleation behavior, similarly sized droplets may not transition under identical conditions.
Temperature, pressure, and composition directly influence whether a droplet remains liquid, vaporizes, or supports condensation. Heating supplies the condition for vaporization, pressure reduction can promote the transition, and compositional changes can shift the droplet toward supersaturation. These variables provide chemical researchers with several ways to control phase behavior rather than relying on temperature alone.
Their high surface-area-to-volume ratio increases the interface available for exchange relative to the amount of material inside each droplet. As a result, evaporation and cooling can occur rapidly, making these systems useful for examining fast transport processes. The same geometry also makes droplet behavior sensitive to interfacial conditions and confinement, which can influence observed phase transitions.
Vaporization is promoted when a liquid droplet reaches conditions such as increased temperature, reduced pressure, or altered composition that support a vapor phase. Condensation follows the opposite energetic direction: vapor must lose sufficient energy before returning to the liquid state. Studying both directions allows researchers to examine how interfacial thermodynamics governs reversible phase behavior.
A study can begin by generating or selecting micrometer-scale droplets, then controlling temperature, pressure, or composition to move them toward a metastable or supersaturated condition. Researchers monitor the onset of nucleation, vaporization, cooling, or condensation and relate those observations to transport and interfacial behavior. This workflow supports comparisons between confinement conditions and controlled chemical environments.
They are useful when researchers want a confined environment with rapid heat and mass transfer. Evaporation and cooling can proceed quickly because of the droplets' large interfacial area, while controlled phase behavior can affect the local reaction environment. In chemistry, this makes them relevant for studying reaction kinetics and for designing microreactor systems with precise transport control.
The systems support aerosol processing, crystallization, and thermal management in addition to microreactor research. Their phase transitions provide a way to investigate how composition, confinement, and interfacial thermodynamics influence material behavior. By tracking rapid evaporation, cooling, nucleation, or condensation, researchers can connect microscopic droplet conditions with broader changes in transport and phase organization.