2results about How to "Uniform diameter distribution" patented technology

The invention discloses a rough-surface SiC / C nano-composite fiber and a preparation method and application thereof.Soluble precursor PCS and polymer PVP are used as initial materials, tetrahydrofuran and N, N-dimethylformamide are used as solvents, zinc acetylacetonate is used as an additive, and the rough-surface SiC / C nano-composite fiber is prepared. The SiC / C nanofibers with rough surfaces and good electromagnetic wave absorption performance are prepared through electrostatic spinning and high-temperature pyrolysis. The addition of zinc acetylacetonate not only effectively improves the structural stability of SiC / C, but also effectively widens the effective absorption width of the composite fiber due to the design of the surface rough structure. The process is simple, and the prepared fiber has good one-dimensional morphology and shows excellent electromagnetic wave absorption performance.

This invention belongs to the field of inorganic nanofiber materials technology, specifically relating to a highly flexible boron nanofiber (BN) ceramic nanofiber and its preparation method. Using boric acid and melamine as main raw materials, this invention prepares the nanofiber through a complexation reaction, solution preparation, electrospinning, and heat treatment. The raw materials are inexpensive, the process is simple, and it is easy to scale up production. By heating the electrospinning needle at 90-120℃, the viscosity of the precursor needle tip is reduced, preventing premature crystallization of the complex and completely solving the needle clogging problem, ensuring continuous and stable spinning, and improving spinning efficiency and fiber quality. The resulting BN nanofibers are continuous, have uniform diameter, and a smooth surface. The controllable transformation from amorphous BN to highly crystalline hexagonal boron nitride can be achieved by adjusting the heat treatment temperature. The amorphous BN nanofiber felt has extremely low thermal conductivity (≤0.029 W / (m·K)) and excellent compression resilience, making it suitable as a reinforcement for composite materials or directly applicable in high-temperature filtration, high-efficiency heat insulation, and catalyst carriers.