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Updated: Aug 11, 2026
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A Femtoliter Droplet Array for Massively Parallel Protein Synthesis from Single DNA Molecules
Published on: June 20, 2020
Thermally Regulated Droplet Microfluidics Enables Uniform, Size-Controllable DNA-Nanoparticle Superlattices
Naotomo Tottori1, Miho Tagawa2,3, Azusa Takao1
1Department of Mechanical Engineering, Faculty of Engineering, Kyushu University, Fukuoka, Japan.
Small (Weinheim an Der Bergstrasse, Germany)
|August 10, 2026
Summary
We developed a microfluidic method to create uniform DNA-nanoparticle crystals for molecular delivery. This approach significantly reduces size variability compared to traditional methods, enabling better control over crystal assembly.
Area of Science:
- Nanotechnology
- Materials Science
- Biophysics
Background:
- DNA-nanoparticle assemblies exhibit unique optical and electronic properties.
- Their encapsulation ability makes them suitable for molecular delivery applications.
- Conventional batch crystallization methods yield crystals with poor size uniformity and structural order.
Purpose of the Study:
- To develop a microfluidic strategy for producing size-controllable, single-crystallite DNA-nanoparticle superlattices.
- To overcome limitations of batch crystallization, such as heterogeneous nucleation and aggregation.
- To enable applications requiring uniform DNA-nanoparticle crystals, like dose-quantized delivery.
Main Methods:
- Utilized a thermally regulated droplet-microfluidic system to generate monodisperse water-in-oil droplets.
- Maintained droplets at 65°C to prevent premature hybridization, followed by ultra-slow cooling for controlled assembly.
- Employed small-angle X-ray scattering to analyze crystal structure and domain size.
Main Results:
- Achieved uniform, size-controllable, single-crystallite DNA-functionalized gold nanoparticle (DNA-AuNP) superlattices.
- Demonstrated a ninefold reduction in size variability in droplets (9–23 µm) compared to batch processing.
- Observed consistent characteristic domain size across droplet sizes, indicating size-dependent nucleation statistics.
Conclusions:
- The droplet-microfluidic method provides a route to highly ordered DNA-AuNP superlattices with controllable size and number.
- Confinement in droplets suppresses multi-nucleation and convection, improving crystal quality.
- This controlled assembly is crucial for advanced applications in molecular delivery and plasmonics.
