Shell structure and stability of sophorolipid-coated iron oxide nanoparticles
A new class of monodispersed water-soluble iron oxide glyconanoparticles (NPs) is synthesized using a biobased microbial glycolipid called sophorolipids (SL). This compound is composed of a disaccharide (glucose beta1,2) attached to an oleic acid moiety. The free-standing COOH group of oleic acid is modified with nitrodopamine (NDA), a strong stabilizing agent of iron oxide nanoparticles. TEM show NPs with a radius of 2.3+ 0.2 nm and TGA allows to determine a grafting density of 0.7 SL-NDA per nm2. However, DLS indicates an average hydrodynamic radius of > 20 nm. For this reason, we want to investigate the exact nature of the NPs shell, the origin of the very good nanoparticle stability in water and, consequently, the SL configuration at the NP surface. Considering the poor contrast against x-rays between the SL shell and the NP/water system, we use neutrons to accomplish this task. SL structure (size, experimental SLD) and stability (size and SLD variations) against ionic strength, dehydration and purification will be analyzed.
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BACCILE Niki; CRISTIGLIO Viviana; GRILLO Isabelle; LASSENBERGER Andrea and Erik Reimhult. (2017). Shell structure and stability of sophorolipid-coated iron oxide nanoparticles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-481
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