Application Cases

Experiment Name: Experimental Study on the Synthesis of CsPbBr₃ Perovskite Nanocrystals Using a Micromixer

Research Direction: Optimizing Rapid Nucleation and Growth of Perovskite Nanocrystals Based on Microfluidic Acoustic Mixing Technology

Experimental Content: Investigation of a dual-drive acoustic mixer to achieve fluid disturbance in microchannels for the synthesis of CsPbBr₃ nanocrystals via the Ligand-Assisted Reprecipitation (LARP) method.

Test Equipment: Signal generator, ATA-308 power amplifier, X-ray diffractometer, transmission electron microscope, etc.

Experimental Process:

Figure: Experimental process

Figure: Experimental process

The experimental system generated an acoustic driving signal of 2.6 ± 2 kHz using a signal generator, which was amplified by the ATA-308 power amplifier to drive the piezoelectric transducer. This excitation induced synergistic vibrations of sharp edges and bubbles within the microchannel, generating reverse vortex disturbances. A fluorescent solution and deionized water were injected into the micromixer at flow rate ratios ranging from 1:1 to 1:10. Fluorescence distribution was recorded, and the mixing index (M) was calculated to evaluate mixing efficiency. For different structures (S1: single sharp edge, S2: sharp edge-groove composite structure), mixing time and uniformity were validated within a flow rate range of 10–1000 μL/min. CsPbBr₃ perovskite nanocrystals were continuously synthesized using the LARP method: a CsBr/PbBr₂ DMF precursor solution and an antisolvent IPA were injected into the acoustic mixer at a 1:10 ratio, leveraging ultrafast mixing to trigger nucleation and directional growth.

Experimental Results:

Figure: Experimental results 1

Figure: Experimental results 2

When the acoustic field was activated, the mixing index (M) of the micromixer exceeded 0.8, with a mixing time as low as 5 ms. The S2 sharp edge-groove composite structure demonstrated superior mixing performance compared to the S1 single sharp edge traditional micromixer. The synthesized products were characterized using UV-Vis spectroscopy (characteristic absorption peak at 519 nm), photoluminescence spectroscopy (luminescence intensity at 520 nm increased by 118%), and TEM (size distribution of 19.9 ± 6.44 nm). The nanocrystals synthesized using the acoustic mixer exhibited 118% higher luminescence intensity than those produced in traditional reactors, along with better dispersibility, more uniform particle size distribution, and fewer by-products.

Recommended Power Amplifier: ATA-308C

Figure: ATA-308C power amplifier specifications and parameters