Colloidal stability of iron oxide nanocrystals coated with a PEG-based tetra-catechol surfactant (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• Colloidal stability of iron oxide nanocrystals coated with a PEG-based tetra-catechol surfactant (Articolo in rivista) (literal)

Anno

• 2013-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1088/0957-4484/24/10/105702 (literal)

Alternative label

• S. Mondini, C. Drago, A. M. Ferretti, A. Puglisi and A. Ponti (2013)
  Colloidal stability of iron oxide nanocrystals coated with a PEG-based tetra-catechol surfactant
  in Nanotechnology (Bristol. Print)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• S. Mondini, C. Drago, A. M. Ferretti, A. Puglisi and A. Ponti (literal)

Pagina inizio

• 105702 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 24 (literal)

Rivista

• Nanotechnology (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• Laboratorio di Nanotecnologie, Istituto di Scienze e Tecnologie Molecolari, Consiglio Nazionale delle Ricerche, via G. Fantoli 16/15, Milano I-20138, Italy (literal)

Titolo

• Colloidal stability of iron oxide nanocrystals coated with a PEG-based tetra-catechol surfactant (literal)

Abstract

• Long-term colloidal stability of magnetic iron oxide nanoparticles (NPs) is an important goal that has not yet been fully achieved. To make an advance in our understanding of the colloidal stability of iron oxide NPs in aqueous media, we prepared NPs comprising a monodisperse (13 nm) iron oxide core coated with a PEG-based (PEG: polyethyleneglycol) surfactant. This consists of a methoxy-terminated PEG chain (MW D 5000 Da) bearing four catechol groups via a diethylenetriamine linker. The surfactant was grafted onto the nanocrystals by ligand exchange monitored by infrared spectroscopy. The colloidal stability of these nanoparticles was probed by monitoring the time evolution of the Z-average intensity-weighted radius Rh and volume-weighted size distribution Pv obtained from analysis of dynamic light scattering data. The nanoparticles showed no sign of aggregation for four months in deionized water at room temperature and also when subjected to thermal cycling between 25 and 75 C. In 0.01 M PBS (phosphate buffered saline), aggregation (if any) is slow and partial; after 66 h, about 50% of NPs have not aggregated. Aggregation is more effective in 0.15 M NH4AcO buffer, where isolated particles are not observed after 66 h, and especially in acidic NH4AcO=AcOH buffer, where aggregation is complete within 1 h and precipitation is observed. The differing stability of the NPs in the above aqueous media is closely related to their ? potential. (literal)

Prodotto di

• Sistemi funzionali a nanoparticelle magnetiche (PM.P05.012.002) (Modulo)
• Istituto di scienze e tecnologie molecolari (ISTM) (Istituto)

Autore CNR

• ANNA MARIA FERRETTI (Persona)
• CARMELO DRAGO (Persona)
• SARA MONDINI (Unità di personale esterno)
• ALESSANDRA PUGLISI (Unità di personale interno)
• ALESSANDRO PONTI (Unità di personale interno)

Incoming links:

Prodotto

• Istituto di scienze e tecnologie molecolari (ISTM) (Istituto)
• Sistemi funzionali a nanoparticelle magnetiche (PM.P05.012.002) (Modulo)

Autore CNR di

• ANNA MARIA FERRETTI (Persona)
• ALESSANDRO PONTI (Unità di personale interno)
• SARA MONDINI (Unità di personale esterno)
• CARMELO DRAGO (Persona)
• ALESSANDRA PUGLISI (Unità di personale interno)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Nanotechnology (Rivista)