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Porous Si Microparticles Infiltrated with Magnetic Nanospheres

Porous silicon (pSi) microparticles obtained by porosification of crystalline silicon wafers have unique optical properties that, together with biodegradability, biocompatibility and absence of immunogenicity, are fundamental characteristics to candidate them as tracers in optical imaging techniques...

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Autores principales: Chistè, Elena, Ischia, Gloria, Gerosa, Marco, Marzola, Pasquina, Scarpa, Marina, Daldosso, Nicola
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7153621/
https://www.ncbi.nlm.nih.gov/pubmed/32143523
http://dx.doi.org/10.3390/nano10030463
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author Chistè, Elena
Ischia, Gloria
Gerosa, Marco
Marzola, Pasquina
Scarpa, Marina
Daldosso, Nicola
author_facet Chistè, Elena
Ischia, Gloria
Gerosa, Marco
Marzola, Pasquina
Scarpa, Marina
Daldosso, Nicola
author_sort Chistè, Elena
collection PubMed
description Porous silicon (pSi) microparticles obtained by porosification of crystalline silicon wafers have unique optical properties that, together with biodegradability, biocompatibility and absence of immunogenicity, are fundamental characteristics to candidate them as tracers in optical imaging techniques and as drug carriers. In this work, we focus on the possibility to track down the pSi microparticles also by MRI (magnetic resonance imaging), thus realizing a comprehensive tool for theranostic applications, i.e., the combination of therapy and diagnostics. We have developed and tested an easy, quick and low-cost protocol to infiltrate the COOH-functionalized pSi microparticles pores (tens of nanometers about) with magnetic nanospheres (SPIONs—Super Paramagnetic Iron Oxide Nanoparticles, about 5–7 nm) and allow an electrostatic interaction. The structural properties and the elemental composition were investigated by electron microscopy techniques coupled to elemental analysis to demonstrate the effective attachment of the SPIONs along the pores’ surface of the pSi microparticles. The magnetic properties were investigated under an external magnetic field to determine the relaxivity properties of the material and resulting in an alteration of the relaxivity of water due to the SPIONs presence, clearly demonstrating the effectiveness of the easy functionalization protocol proposed.
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spelling pubmed-71536212020-04-20 Porous Si Microparticles Infiltrated with Magnetic Nanospheres Chistè, Elena Ischia, Gloria Gerosa, Marco Marzola, Pasquina Scarpa, Marina Daldosso, Nicola Nanomaterials (Basel) Article Porous silicon (pSi) microparticles obtained by porosification of crystalline silicon wafers have unique optical properties that, together with biodegradability, biocompatibility and absence of immunogenicity, are fundamental characteristics to candidate them as tracers in optical imaging techniques and as drug carriers. In this work, we focus on the possibility to track down the pSi microparticles also by MRI (magnetic resonance imaging), thus realizing a comprehensive tool for theranostic applications, i.e., the combination of therapy and diagnostics. We have developed and tested an easy, quick and low-cost protocol to infiltrate the COOH-functionalized pSi microparticles pores (tens of nanometers about) with magnetic nanospheres (SPIONs—Super Paramagnetic Iron Oxide Nanoparticles, about 5–7 nm) and allow an electrostatic interaction. The structural properties and the elemental composition were investigated by electron microscopy techniques coupled to elemental analysis to demonstrate the effective attachment of the SPIONs along the pores’ surface of the pSi microparticles. The magnetic properties were investigated under an external magnetic field to determine the relaxivity properties of the material and resulting in an alteration of the relaxivity of water due to the SPIONs presence, clearly demonstrating the effectiveness of the easy functionalization protocol proposed. MDPI 2020-03-04 /pmc/articles/PMC7153621/ /pubmed/32143523 http://dx.doi.org/10.3390/nano10030463 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Chistè, Elena
Ischia, Gloria
Gerosa, Marco
Marzola, Pasquina
Scarpa, Marina
Daldosso, Nicola
Porous Si Microparticles Infiltrated with Magnetic Nanospheres
title Porous Si Microparticles Infiltrated with Magnetic Nanospheres
title_full Porous Si Microparticles Infiltrated with Magnetic Nanospheres
title_fullStr Porous Si Microparticles Infiltrated with Magnetic Nanospheres
title_full_unstemmed Porous Si Microparticles Infiltrated with Magnetic Nanospheres
title_short Porous Si Microparticles Infiltrated with Magnetic Nanospheres
title_sort porous si microparticles infiltrated with magnetic nanospheres
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7153621/
https://www.ncbi.nlm.nih.gov/pubmed/32143523
http://dx.doi.org/10.3390/nano10030463
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