2 results about "Particle stability" patented technology

This invention provides peony-shaped gold nanoparticles with an uneven core-shell structure, their preparation method, and applications. We first prepare 50 nm diameter gold nanospheres, then add HAuCl₄, and perform centrifugation and stirring to finally obtain the target product. This structure significantly improves surface roughness and increases the distribution density of electromagnetic "hot spots" while ensuring good particle stability, thereby enhancing the sensitivity of the SERS signal.

The invention discloses a test method for the leakage stability of geomembrane defects in a reservoir basin under simulated water level rise and fall conditions, including a pressure head system, a geomembrane defect leakage test system, and a measurement system. By applying variable head test conditions, the invention simulates the leakage process of geomembrane defects under water level rise, fall, and cyclic rise and fall in the actual reservoir basin project of a pumped storage power station. Through the change in the position of the dyed cushion material particles before and after the test, the radial migration distance of the cushion particles and the particle stability rate are obtained. Combining the size characteristics of the scour pit of the cushion, indicators are set to evaluate the seepage stability of the cushion after the leakage of the geomembrane defect, and the relationship between the leakage volume, the water head, and the characteristics of the geomembrane defect is established to quantitatively evaluate the leakage stability of the geomembrane defect under water head change, providing a theoretical basis for the anti-seepage design of geomembranes in reservoir basin projects, especially for the reservoir basin projects of pumped storage power stations with high anti-seepage requirements and large water level changes.