Nanofuels can be classified based on the type of nanoparticles used. Some common types include: - Metal Nanoparticles: These include nanoparticles of metals such as aluminum, iron, and zinc. They are known for their high energetic properties and are often used in aerospace applications. - Metal Oxide Nanoparticles: Examples include titanium dioxide and cerium oxide. These particles are excellent catalysts and are used to enhance the oxidation process. - Carbon-Based Nanoparticles: These include carbon nanotubes and graphene. They offer superior thermal and electrical properties, making them ideal for high-performance applications.