Introduction to Dynamic Light Scattering - Day 1 Recap
Introduction to Dynamic Light Scattering covered concepts, lab measurements, and analysis of diffusive time scales. Topics included measuring DI water, PS latex spheres, and a mystery sample. Results showed highly mono-dispersed PS latex standards and discussed challenges in analyzing mixtures of different-sized particles.
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Presentation Transcript
786 Recap of Day 1
Concepts & Lab Introduction to Dynamic Light Scattering Measurement of diffusive time scales via intensity fluctuations Data fitting options Practical considerations (Slides now online? With ) Measurement of DI water, PS latex spheres & mystery sample
PS Latex standards 1000x dilution from stock Nominal 50nm & 200nm diameter individually Cumulant results: 3 measures of radius within 1% PDI values less than 0.05 Very mono-dispersed well-behaved samples
1:1 Mixture Appearance of single decay and single peak in size distribution Size ratio: 115nm / 30nm = factor of 3.8 Possibly not sufficiently well-separated Measurement at 150 degrees did not resolve 30nm no longer scattering isotropically Other options Would CONTIN analysis resolve peaks? What if small particles were predominant with only fraction of large ones?
