What are the Methods for Controlling Particle Size?
Several methods are employed to control the size of nanoparticles, each with its own advantages and limitations:
1. Chemical Vapor Deposition (CVD): This technique involves the deposition of a material from a vapor phase, allowing precise control over particle size. 2. Sol-Gel Process: A wet-chemical technique that transforms a solution into an inorganic solid, enabling control over the size and morphology of nanoparticles. 3. Microemulsion: Utilizes microemulsions as reaction media to produce nanoparticles with controlled size. 4. Mechanical Milling: A top-down approach where bulk materials are broken down into nanoparticles through mechanical forces. 5. Laser Ablation: Uses high-energy laser pulses to create nanoparticles from a solid material, offering precise size control.
