Abstract: Provided are a twist-bend nematic (NTB) LC dimer-based material and use thereof, and an LC-based cholesteric heliconical (CH) material and use thereof. The NTB LC dimer-based material is at least one selected from the group consisting of CBnCB, CBnOCB, and CBOnOCB, with n being a positive integer of 3 to 15. Based on ultra-stable properties of the material, the disclosure further provides the LC-based CH material, which uses the LC dimer-based material as a key raw material and integrates a conventional nematic LC monomer material and a chiral molecule.

Abstract: The disclosure provides a friction regulation method, apparatus and system for molybdenum disulfide. The method includes: acquiring frictional force data of a friction pair corresponding to the molybdenum disulfide under different electron beam irradiation conditions, and the different electron beam irradiation conditions includes different accelerating voltage conditions and different electron beam current conditions; acquiring frictional characteristic data of the molybdenum disulfide based on the frictional force data of the friction pair corresponding to the molybdenum disulfide under the different electron beam irradiation conditions; and controlling, after acquiring a target frictional force of the molybdenum disulfide, an electron beam to irradiate the molybdenum disulfide based on the frictional characteristic data of the molybdenum disulfide, to regulate a frictional force of the friction pair corresponding to the molybdenum disulfide to the target frictional force.

Abstract: A single-atom catalyst with molecular sieve-confined domains and a preparation method and application thereof are provided in the present disclosure. According to the present disclosure, the physical structure and chemical anchoring action of the molecular sieve are utilized to confine the bimetallic ions, so that the bimetallic ions of the catalyst are dispersed in single atoms, electrons in the bimetallic ions are transferred from transition metals to precious metals to promote d-?* orbital hybridization to enhance NO adsorption, and an electron-rich environment and sufficient active sites are provided for NO adsorption and dissociation in the CO-SCR reaction; the transition metals adsorb CO to promote the transformation of N2O, NO2 and other intermediates into N2, and the transition metal serves as a sacrificial site for the poisoning of SO2 to enhance the sulphur-resistant property of the catalyst.