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Ortiz Peña N, Ihiawakrim D, Creţu S, Cotin G, Kiefer C, Begin-Colin S, Sanchez C, Portehault D, Ersen O. In situ liquid transmission electron microscopy reveals self-assembly-driven nucleation in radiolytic synthesis of iron oxide nanoparticles in organic media. NANOSCALE 2022; 14:10950-10957. [PMID: 35860928 DOI: 10.1039/d2nr01511k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
We have investigated the early stages of the formation of iron oxide nanoparticles from iron stearate precursors in the presence of sodium stearate in an organic solvent by in situ liquid phase transmission electron microscopy (IL-TEM). Before nucleation, we have evidenced the spontaneous formation of vesicular assemblies made of iron polycation-based precursors sandwiched between stearate layers. Nucleation of iron oxide nanoparticles occurs within the walls of the vesicles, which subsequently collapse upon the consumption of the iron precursors and the growth of the nanoparticles. We then evidenced that fine control of the electron dose, and therefore of the local concentration of reactive iron species in the vicinity of the nuclei, enables controlling crystal growth and selecting the morphology of the resulting iron oxide nanoparticles. Such a direct observation of the nucleation process templated by vesicular assemblies in a hydrophobic organic solvent sheds new light on the formation process of metal oxide nanoparticles and therefore opens ways for the synthesis of inorganic colloidal systems with tunable shape and size.
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Affiliation(s)
- Nathaly Ortiz Peña
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS Université de Strasbourg, BP 43 Strasbourg Cedex 2, France.
- Université Paris Cité, CNRS, Laboratoire Matériaux et Phénomènes Quantiques, 75013 Paris, France
| | - Dris Ihiawakrim
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS Université de Strasbourg, BP 43 Strasbourg Cedex 2, France.
| | - Sorina Creţu
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS Université de Strasbourg, BP 43 Strasbourg Cedex 2, France.
| | - Geoffrey Cotin
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS Université de Strasbourg, BP 43 Strasbourg Cedex 2, France.
| | - Céline Kiefer
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS Université de Strasbourg, BP 43 Strasbourg Cedex 2, France.
| | - Sylvie Begin-Colin
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS Université de Strasbourg, BP 43 Strasbourg Cedex 2, France.
| | - Clément Sanchez
- Sorbonne Université, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), 4 place Jussieu, F-75005, Paris, France
- University of Strasbourg Institute for Advanced Studies (USIAS), 67083 Strasbourg, France
| | - David Portehault
- Sorbonne Université, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (CMCP), 4 place Jussieu, F-75005, Paris, France
| | - Ovidiu Ersen
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS Université de Strasbourg, BP 43 Strasbourg Cedex 2, France.
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Demin AM, Vakhrushev AV, Mekhaev AV, Uimin MA, Krasnov VP. Modification of Fe3O4 magnetic nanoparticles with a GRGD peptide. Russ Chem Bull 2021. [DOI: 10.1007/s11172-021-3107-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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King AM, Bray C, Hall SCL, Bear JC, Bogart LK, Perrier S, Davies GL. Exploring precision polymers to fine-tune magnetic resonance imaging properties of iron oxide nanoparticles. J Colloid Interface Sci 2020; 579:401-411. [PMID: 32615483 DOI: 10.1016/j.jcis.2020.06.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 05/14/2020] [Accepted: 06/07/2020] [Indexed: 11/27/2022]
Abstract
The use of bio-polymers as stabilising agents for iron oxide-based negative magnetic resonance imaging (MRI) contrast agents has become popular in recent years, however the wide polydispersity of biologically-derived and commercially available polymers limits the ability to produce truly tuneable and reproducible behaviour, a major challenge in this area. In this work, stable colloids of iron oxide nanoparticles were prepared utilising precision-engineered bio-polymer mimics, poly(2-acrylamido-2-methylpropane sodium sulfonate) (P(AMPS)) polymers, with controlled narrow polydispersity molecular weights, as templating stabilisers. In addition to producing magnetic colloids with excellent MRI contrast capabilities (r2 values reaching 434.2 mM-1 s-1 at 25 °C and 23 MHz, several times higher than similar commercial analogues), variable field relaxometry provided unexpected important insights into the dynamic environment of the hydrated materials, and hence their exceptional MRI behaviour. Thanks to the polymer's templating backbone and flexible conformation in aqueous suspension, nanocomposites appear to behave as "multi-core" clustered species, enhancing interparticle interactions whilst retaining water diffusion, boosting relaxation properties at low frequency. This clustering behaviour, evidenced by small-angle X-ray scattering, and strong relaxometric response, was fine-tuned using the well-defined molecular weight polymer species with precise iron to polymer ratios. By also showing negligible haemolytic activity, these nanocomposites exhibit considerable potential for MRI diagnostics.
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Affiliation(s)
- Aaron M King
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
| | - Caroline Bray
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
| | - Stephen C L Hall
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
| | - Joseph C Bear
- School of Life Science, Pharmacy and Chemistry, Kingston University, Penryhn Road, Kingston-upon-Thames, KT1 2EE, UK
| | - Lara K Bogart
- UCL Healthcare Biomagnetics Laboratory, 21 Albemarle Street, London W1S 4BS, UK
| | - Sebastien Perrier
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
| | - Gemma-Louise Davies
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
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PAMAM Dendrimer Functionalized Manganese Ferrite Magnetic Nanoparticles: Microwave-Assisted Synthesis and Characterization. J Inorg Organomet Polym Mater 2018. [DOI: 10.1007/s10904-018-0865-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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