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Hoo Christopher M. Starostin Natasha West Paul Mecartney Martha L. 《Journal of nanoparticle research》2008,10(1):89-96
This paper compares the accuracy of conventional dynamic light scattering (DLS) and atomic force microscopy (AFM) for characterizing size distributions of polystyrene nanoparticles in the size range of 20–100 nm. Average DLS values for monosize dispersed particles are slightly higher than the nominal values whereas AFM values were slightly lower than nominal values. Bimodal distributions were easily identified with AFM, but DLS results were skewed toward larger particles. AFM characterization of nanoparticles using automated analysis software provides an accurate and rapid analysis for nanoparticle characterization and has advantages over DLS for non-monodispersed solutions. 相似文献
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Christopher M. Hoo Trang Doan Natasha Starostin Paul E. West Martha L. Mecartney 《Journal of nanoparticle research》2010,12(3):939-949
Optimal deposition procedures are determined for nanoparticle size characterization by atomic force microscopy (AFM). Accurate
nanoparticle size distribution analysis with AFM requires non-agglomerated nanoparticles on a flat substrate. The deposition
of polystyrene (100 nm), silica (300 and 100 nm), gold (100 nm), and CdSe quantum dot (2–5 nm) nanoparticles by spin coating
was optimized for size distribution measurements by AFM. Factors influencing deposition include spin speed, concentration,
solvent, and pH. A comparison using spin coating, static evaporation, and a new fluid cell deposition method for depositing
nanoparticles is also made. The fluid cell allows for a more uniform and higher density deposition of nanoparticles on a substrate
at laminar flow rates, making nanoparticle size analysis via AFM more efficient and also offers the potential for nanoparticle
analysis in liquid environments. 相似文献
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