2results about How to "Strong structural controllability" patented technology

The application relates to the technical field of nanomaterial preparation, in particular to a method for preparing Cu@Ag particles by laser, which comprises the following steps: S1, preparing a solution: dissolving a copper precursor in a solvent to obtain a copper precursor solution, and dissolving a silver precursor in a solvent to obtain a silver precursor solution; S2, irradiating the copper precursor solution by using a femtosecond pulse laser to generate nano-copper particle cores through reduction; S3, adding the silver precursor solution into the liquid phase environment containing the nano-copper particle cores, adjusting the wavelength parameter of the picosecond pulse laser to the surface of the nano-copper particle cores to realize laser energy focusing, irradiating the solution by using the picosecond pulse laser, allowing silver ions to be reduced and deposited on the surface of the nano-copper particle cores to form a silver shell, and thus obtaining Cu@Ag particles, so that the problems that the existing chemical reduction method is not environmentally friendly and it is difficult to accurately control the generation sequence of the core and the shell are solved.

The invention relates to a multifunctional bio-based lubricating oil additive as well as a preparation method and application thereof. Natural sinapic acid, a boron-containing compound and long-chain alkyl acrylate are used as components, the oil-soluble multifunctional bio-based lubricating oil additive is prepared through a protection-polymerization-activation three-step method, active sites are shielded firstly, and release is performed after polymerization, so that efficient copolymerization of multifunctional monomers is realized. The multifunctional additive structurally comprises three key functional units: a sinapic acid unit (m) for providing hindered phenolic hydroxyl and endowing excellent oxidation resistance; the side chain of the boron-containing unit (p) contains a boronic acid pinacol ester group, so that excellent wear resistance and friction reduction performance are provided; the long chain alkyl unit (n) provides good oil solubility and acts as a viscosity index improver. By adjusting the ratio of m: n: p, the performance emphasis of the additive can be customized according to different working condition requirements.