Superparamagnetic iron oxide nanoparticles incorporated into silica nanoparticles by inelastic collision via ultrasonic field: Role of colloidal stability

2015 ◽  
Author(s):  
Bashiru Kayode Sodipo ◽  
Abdul Aziz Azlan
Keyword(s):  
Iron Oxide ◽  
Silica Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Colloidal Stability ◽  
Inelastic Collision ◽  
Superparamagnetic Iron Oxide ◽  
Ultrasonic Field ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles

Rolling and unrolling of graphene sheets via in situ generation of superparamagnetic iron oxide nanoparticles

2019 ◽  
Vol 21 (30) ◽  
pp. 16413-16417 ◽  
Author(s):  
Meera Sathyan ◽  
M. K. Jayaraj ◽  
Honey John
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Magnetite Nanoparticles ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Graphene Sheets ◽  
In Situ Generation

The role of magnetite nanoparticles in the scrolling and unscrolling of graphene sheets.

scholarly journals Polyelectrolyte coating on superparamagnetic iron oxide nanoparticles as interface between magnetic core and biorelevant media

2016 ◽  
Vol 6 (6) ◽  
pp. 20160068 ◽  
Author(s):  
Etelka Tombácz ◽  
Katalin Farkas ◽  
Imre Földesi ◽  
Márta Szekeres ◽  
Erzsébet Illés ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Colloidal Stability ◽  
High Surface ◽  
Fatal Outcome ◽  
Superparamagnetic Iron Oxide ◽  
Surface Reactivity ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Biorelevant Media

Nanoparticles do not exist in thermodynamical equilibrium because of high surface free energy, thus they have only kinetic stability. Spontaneous changes can be delayed by designed surface coating. In biomedical applications, superparamagnetic iron oxide nanoparticles (SPIONs) require an optimized coating in order to fulfil the expectation of medicine regulatory agencies and ultimately that of biocompatibility. In this work, we show the high surface reactivity of naked SPIONs due to ≡Fe–OH sites, which can react with H + /OH − to form pH- and ionic strength-dependent charges. We explain the post-coating of naked SPIONs with organic polyacids via multi-site complex bonds formed spontaneously. The excess polyacids can be removed from the medium. The free COOH groups in coating are prone to react with active biomolecules like proteins. Charging and pH- and salt-dependent behaviour of carboxylated SPIONs were characterized quantitatively. The interrelation between the coating quality and colloidal stability measured under biorelevant conditions is discussed. Our coagulation kinetics results allow us to predict colloidal stability both on storage and in use; however, a simpler method would be required to test SPION preparations. Haemocompatibility tests (smears) support our qualification for good and bad SPION manufacturing; the latter ‘promises’ fatal outcome in vivo .

The role of iron redox state in the genotoxicity of ultrafine superparamagnetic iron oxide nanoparticles

Biomaterials ◽  
2012 ◽  
Vol 33 (1) ◽  
pp. 163-170 ◽  
Author(s):  
Neenu Singh ◽  
Gareth J.S. Jenkins ◽  
Bryant C. Nelson ◽  
Bryce J. Marquis ◽  
Thierry G.G. Maffeis ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Redox State ◽  
Superparamagnetic Iron Oxide ◽  
Superparamagnetic Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Iron Redox ◽  
Iron Redox State
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