Silica Particle Size
Silica Particle Size Standards
Silica Nanoparticles are Particle Size Standards with 10% Solids in Deionized Water Solution – Purchase Now
Silica particles are spherical is structure and quite accurate in size peak with a typical 3% variation of the peak size. Silica particles are monodisperse, particle size standards with NIST Traceability to NIST SRM Standards, as measured by a Brookhaven particle counter. The particle sizes are typically at 5nm increments, but we offer certain sizes that have specific references to well known Polystyrene latex sphere sizes, as well as NIST SRM calibration points of 60nm, 102nm, 269nm and 895nm. Silica particle sizes range from 40 nm (nanometers) to 2 microns (2000 nm). Silica nanoparticles at below 105nm are suspended in Ethanol to minimize particle agglomeration, while Silica particles at or greater than 105nm are suspended in deionized (DI) water. SiO2 particles are available in 15ml volumes or 100ml volumes. The refractive index of Silica particles is similar to PSL refractive index. Silica particle Refractive Index is: (n=1.46), while Polystyrene Latex (PSL refractive index is (n=1.585), both measured at 633 nm laser wavelength. With similar refractive indexes and the robust nature of silica, the SiO2 particles are quite beneficial for wafer inspection system calibration under 150 nm since the high power lasers of modern particle detection tools cause PSL spheres to shrink over a short period of time. Since the SiO2 laser response is similar to PSL laser response, the silica nanoparticles solve PSL calibration problems when using high powered laser tools. SiO2 particles do not shrink with the laser power from these more modern particle inspection tools. Visit Applied Physics for more discussion.
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