3results about How to "Enhanced interfacial polarization" patented technology

This invention belongs to the field of electromagnetic wave absorbing materials technology, specifically relating to an absorbing material, its preparation method, and its application. This invention uses multi-walled carbon nanotubes (MWCNTs), potassium permanganate (KMnO4), and divalent manganese as raw materials, based on Mn... 2+ With MnO4 ‑ The redox reaction between the two components allows for in-situ uniform loading of MnO2 nanoparticles onto the MWCNT surface through simple stirring in a room-temperature liquid environment, resulting in microwave absorption performance superior to most similar absorbing materials. Compared to traditional methods for preparing absorbing materials, the technical route of this invention offers significant advantages, including simple preparation process, no pollutant emissions, energy-saving and environmentally friendly process, adjustable and controllable material structure, excellent microwave absorption performance, and scalability. This method effectively overcomes the technical limitations in the preparation of absorbing materials, providing a scalable new paradigm for the green and large-scale production of high-performance absorbing materials.

The application discloses a preparation method of a high-strength flexible self-supporting hydrophobic electromagnetic shielding film, which comprises the following steps: weighing a certain amount of carbon titanium-aluminum, slowly adding the carbon titanium-aluminum into a lithium fluoride / hydrochloric acid etching solution, magnetically stirring in a water bath at a certain temperature for a period of time, obtaining an etched carbon titanium-aluminum dispersion liquid, carrying out acid pickling on the carbon titanium-aluminum dispersion liquid by using dilute hydrochloric acid, and then washing the carbon titanium-aluminum dispersion liquid until neutral, so as to obtain multi-layer titanium carbide; carrying out ultrasonic treatment on the multi-layer titanium carbide, so as to obtain few-layer titanium carbide; mixing the prepared few-layer titanium carbide and bacterial cellulose with nano-iron oxide respectively; alternately performing vacuum filtration on the mixed solutions of bacterial cellulose / nano-iron oxide and few-layer titanium carbide / nano-iron oxide; and naturally airing the obtained film at room temperature. Finally, methyltrimethoxysilane is deposited on the surface of the film to form a hydrophobic network. The film prepared by the method has the characteristics of good flexibility, high electromagnetic shielding performance and high mechanical strength.

This invention relates to the field of functional material preparation technology, and discloses an epoxy resin-based composite microwave absorbing material and its preparation method. The method includes preparing a polyaniline / ferric oxide / titanium dioxide ternary composite microwave absorbing agent, surface-coating it with boron nitride nanosheets to obtain a modified composite microwave absorbing agent; preparing a thermally conductive matrix layer slurry and a microwave absorbing functional layer slurry respectively; applying the microwave absorbing functional layer slurry to the bottom of a mold using a doctor blade coating method, pre-curing it, then pouring the thermally conductive matrix layer slurry onto it, and finally curing it to obtain a two-layer composite material. This invention enhances dielectric loss through the microcapacitance effect within the microwave absorbing functional layer, while simultaneously utilizing the thermally conductive matrix layer to construct a continuous thermally conductive network, thus alleviating the problem of mutual constraint between microwave absorption and thermal conductivity performance.