4 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 belongs to the technical field of cell material detection, and discloses a lithium hydroxide particle stability detection method, device, medium and system.The method comprises the steps that a lithium hydroxide particle sample to be detected is obtained, and the lithium hydroxide particle sample to be detected is pretreated; detecting the pretreated lithium hydroxide particle sample to be detected to obtain detection data of the lithium hydroxide particle sample to be detected; a lithium hydroxide metal particle stability detection model is constructed and trained; and inputting the detection data of the lithium hydroxide particle sample to be detected into the detection model to obtain the stability index of the lithium hydroxide particle sample. The lithium hydroxide particle stability detection precision can be improved.

The invention belongs to the technical field of pharmaceutical engineering, and provides a method for adjusting the state of a micronized bulk drug, according to the provided method, a propellant is used as a system main body to adjust the state of the micronized bulk drug, the particle size is basically kept unchanged before and after treatment, and the particle size of the treated powder drug is stable and controllable; the particle size of the treated powder medicine does not change drastically even if the powder medicine is stored for a long time, good particle stability is kept, and the powder medicine is particularly suitable for immediate treatment of micronized raw material medicines of inhalation preparations. The method provided by the invention also has the unique advantages of high yield, simplicity and convenience in use, low input cost and capability of realizing green, circulating and clean production, and is suitable for industrial production and use.

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.