量子点削弱水分子氢键缔合作用研究OA

Carbon-silicon quantum dots were prepared by evaporation solvothermal method.The quantum dot solutions were prepared with distilled water and simulated formation water for Raman spectroscopy analysis.The effect of quantum dots on the hydrogen bonding of water molecules was verified by core displacement experiment and 17O NMR characterization.The experimental results show that with the increase of quantum dot content,the characteristic peaks of strong hydrogen bond,weak hydrogen bond,and free hydrogen-oxygen bond in the Raman spectrum of peak fitting present a"right shift"phenomenon,indicating that quantum dots can effectively weaken the hydrogen bond between water molecules,and the effect is stronger when the quantum dot content is higher.The ions in simulated formation water have a synergistic effect with quantum dots,which enhances the destructive effect of quantum dots on the hydrogen bond network of water molecules.The results of core displacement experiment and 17O NMR characterization show that quantum dots can effectively weaken the hydrogen bond association between water molecules and produce"small molecule water"that can enter the small pores of ultra-low-permeability reservoirs,which can further expand the swept volume on the basis of conventional water flooding.