Continuous Operation on Synthesis and Surface Modification of Rutile Nanoparticles in Designed Microfluidic Reactors

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Synthesis and surface modification of rutile nanoparticles (NPs) are typically separate, multi-step processes.
• Conventional methods often involve pilot processes, increasing complexity and energy consumption.
• Rutile titanium dioxide (TiO2) nanoparticles are widely used, particularly in suspension-based applications.

Purpose of the Study:

• To develop a streamlined, consecutive process for synthesizing and surface-modifying rutile NPs.
• To investigate the advantages of a microfluidic system for nanoparticle preparation.
• To evaluate the impact of the microfluidic method on nanoparticle characteristics and suspension stability.

Main Methods:

• A designed microfluidic system was employed for consecutive synthesis and surface modification of rutile NPs.
• Nanoparticle samples were prepared using the microfluidic method and compared with conventional strategies.
• Suspension stability of naked and coated NPs was assessed using turbidity, agglomeration size, and settlement rate measurements.
• Response surface methodology was utilized to quantify influencing factors on suspension stability.

Main Results:

• The microfluidic method yielded rutile NPs with a smaller particle size (60 nm) and narrower size distribution compared to other methods.
• The integrated microfluidic process simplified the preparation of coated TiO2 NPs.
• Suspension stability assessments indicated improved performance for NPs prepared via the microfluidic route.

Conclusions:

• Consecutive synthesis and surface modification in a microfluidic system offer high controllability and low energy consumption.
• This integrated approach effectively simplifies the preparation of coated TiO2 NPs.
• The microfluidic method provides enhanced control over nanoparticle properties, leading to improved suspension stability.