One-Step Analysis of DNA/Chitosan Complexes by Field-Flow Fractionation Reveals Particle Size and Free Chitosan Content

2010 ◽  
Vol 11 (3) ◽  
pp. 549-554 ◽  
Author(s):  
Pei Lian Ma ◽  
Michael D. Buschmann ◽  
Françoise M. Winnik
Keyword(s):  
Particle Size ◽  
Field Flow Fractionation ◽  
One Step ◽  
Chitosan Content ◽  
Flow Fractionation

Quantitative analysis of virus-like particle size and distribution by field-flow fractionation

2008 ◽  
Vol 99 (6) ◽  
pp. 1425-1433 ◽  
Author(s):  
Yap P. Chuan ◽  
Yuan Y. Fan ◽  
Linda Lua ◽  
Anton P.J. Middelberg
Keyword(s):  
Particle Size ◽  
Quantitative Analysis ◽  
Field Flow Fractionation ◽  
Virus Like Particle ◽  
Flow Fractionation

Preparation of tailor-made supported catalysts using asymmetric flow field flow fractionation and their application in hydrogenation

2014 ◽  
Vol 3 (1) ◽  
pp. 87-98 ◽  
Author(s):  
Jens Baumgard ◽  
Marga-Martina Pohl ◽  
Udo Kragl ◽  
Norbert Steinfeldt
Keyword(s):  
Particle Size ◽  
Flow Field ◽  
Metallic Nanoparticles ◽  
Size Range ◽  
Separation Process ◽  
Proton Nuclear Magnetic Resonance ◽  
Field Flow Fractionation ◽  
Asymmetric Flow ◽  
Size And Shape ◽  
Flow Fractionation

AbstractThe optical, chemical, and catalytic properties of metallic nanoparticles (NPs) depend strongly on their particle size and shape. Therefore, the preparation of monodisperse metallic NPs is very important for fundamental studies and practical applications. However, the isolation of the different structures by separation from a polydisperse sample, especially in the size range below 10 nm, is not well applied so far. Here, the asymmetric flow field flow fractionation (AF4) is adapted for the preparative separation of the Pd NPs regarding their size and shape in the sub-10-nm size range. To prove the efficiency of the applied method, small-angle X-ray scattering (SAXS) and high-resolution transmission electron microscopy (TEM) were utilized to determine the particle size distribution at different stages of the separation process. A major benefit of this method compared to most of the other separation techniques, the removal of impurities during the separation process, was proven by proton nuclear magnetic resonance (NMR). The obtained results demonstrate that the AF4 is well suited for the rapid preparation of the purified uniform precious metal NPs at the applied size range. Single fractions of the different-sized and -shaped Pd NPs were deposited on titania (TiO2) and tested in the catalytic hydrogenation of 2,5 hydroxymethylfurfural (HMF) in aqueous solution under mild conditions. While the spherical-shaped particles show a high activity, the separated agglomerated particles show a higher selectivity to the desired products.

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