{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,3]],"date-time":"2026-03-03T02:17:26Z","timestamp":1772504246656,"version":"3.50.1"},"reference-count":49,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2019,6,28]],"date-time":"2019-06-28T00:00:00Z","timestamp":1561680000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Foundation for Science and Technology (FCT) Portugal","award":["UID\/QUI\/00100\/2013"],"award-info":[{"award-number":["UID\/QUI\/00100\/2013"]}]},{"name":"Foundation for Science and Technology (FCT) Portugal","award":["UID\/Multi\/04349\/2013"],"award-info":[{"award-number":["UID\/Multi\/04349\/2013"]}]},{"name":"Foundation for Science and Technology (FCT) Portugal","award":["PD\/BD\/127914\/2016"],"award-info":[{"award-number":["PD\/BD\/127914\/2016"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nanomaterials"],"abstract":"<jats:p>Superparamagnetic iron oxide nanoparticles (SPIONs) have shown great potential in biomedicine due to their high intrinsic magnetization behaviour. These are small particles of magnetite or maghemite, and when coated, their surface oxidation is prevented, their aggregation tendency is reduced, their dispersity is improved, and the stability and blood circulation time are increased, which are mandatory requirements in biomedical applications. In this work, SPIONs were synthesized in air through a reduction-precipitation method and coated with four different polymers (Polyethylene glycol(PEG) 1000\/6000 and dextran T10\/T70). All the synthesized samples were structurally and magnetically characterized by transmission electron microscopy, Fourier transform infra-red spectroscopy, X-ray powder diffraction, M\u00f6ssbauer spectroscopy, and Superconducting Quantum Interference Device (SQUID) magnetometry. SPIONs centrifuged and dried in vacuum with an average diameter of at least 7.5 nm and a composition \u226460% of maghemite and \u226540% of magnetite showed the best magnetization results, namely a saturation magnetization of ~64 emu\/g at 300 K, similar to the best reported values for SPIONs prepared in controlled atmosphere. As far as SPIONs\u2019 coatings are concerned, during their preparation procedure, surface polymers must be introduced after the SPIONs\u2019 precipitation. Furthermore, polymers with shorter chains do not affect the SPIONs\u2019 magnetization performance, although longer chain polymers significantly decrease the coated particle magnetization values, which is undesirable.<\/jats:p>","DOI":"10.3390\/nano9070943","type":"journal-article","created":{"date-parts":[[2019,6,28]],"date-time":"2019-06-28T11:20:26Z","timestamp":1561720826000},"page":"943","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["SPIONs Prepared in Air through Improved Synthesis Methodology: The Influence of \u03b3-Fe2O3\/Fe3O4 Ratio and Coating Composition on Magnetic Properties"],"prefix":"10.3390","volume":"9","author":[{"given":"Joana","family":"Matos","sequence":"first","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Universidade de Lisboa, Av. Rovisco Pais, IST, 1000 Lisboa, Portugal"},{"name":"Centro de Ci\u00eancias e Tecnologias Nucleares, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal"},{"name":"Departamento de Engenharia Qu\u00edmica, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, IST, 1000 Lisboa, Portugal"}]},{"given":"M.","family":"Gon\u00e7alves","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Universidade de Lisboa, Av. Rovisco Pais, IST, 1000 Lisboa, Portugal"},{"name":"Departamento de Engenharia Qu\u00edmica, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, IST, 1000 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8818-0039","authenticated-orcid":false,"given":"Laura","family":"Pereira","sequence":"additional","affiliation":[{"name":"Centro de Ci\u00eancias e Tecnologias Nucleares, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal"}]},{"given":"Bruno","family":"Vieira","sequence":"additional","affiliation":[{"name":"Centro de Ci\u00eancias e Tecnologias Nucleares, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6171-4099","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Waerenborgh","sequence":"additional","affiliation":[{"name":"Centro de Ci\u00eancias e Tecnologias Nucleares, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2019,6,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"98","DOI":"10.1016\/j.biomaterials.2017.05.013","article-title":"Surface design of magnetic nanoparticles for stimuli-responsive cancer imaging and therapy","volume":"136","author":"Kang","year":"2017","journal-title":"Biomaterials"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1016\/j.canlet.2016.10.032","article-title":"The application of nanoparticles in diagnosis and theranostics of gastric cancer","volume":"386","author":"Li","year":"2017","journal-title":"Cancer Lett."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"256","DOI":"10.1016\/j.addr.2016.07.007","article-title":"Oral absorption of peptides and nanoparticles across the human intestine: Opportunities, limitations and studies in human tissues","volume":"106","author":"Lundquist","year":"2016","journal-title":"Adv. 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