Quo vadis, worldwide nanoindustry?

Emashova, N. A.; Kudryashov, V. E.; Sorkina, T.A.; Balandina, A. V.; Bratishchev, A. V.; Sklyar, V. I.; Kalyuzhnyi, S.

doi:10.1134/s199507801602004x

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Superparamagnetic iron oxide nanoparticles (SPIONs) with a size less than 5 nm have attracted growing attention as emerging nanomaterials for biomedical applications, including magnetic resonance imaging (MRI), drug delivery and theranostics, due to their high biocompatibility, chemical stability, tunable surface features, prolonged blood circulation time due to the reduced phagocytosis by macrophages and T 1 -shortening effect (unlike larger iron oxide nanoparticles) in MRI [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Goldt¹,

Polyakov²,

Sorkina³

et al. 2019

Nanosystems: Phys. Chem. Math.

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Superparamagnetic iron oxide γ-Fe 2 O 3 (maghemite) nanoparticles (SPION) encapsulated into water-soluble microspheres of rock salt were synthesized via a new aerosol spray pyrolysis procedure. Humic acids (HA) were employed to stabilize the aqueous suspensions of γ-Fe 2 O 3 nanoparticles released upon dissolution of the NaCl matrix. The effect of HA on the surface charge of maghemite-based colloids was studied in pH range of 3 -10. Humic polyanions compensate positive charges on a hydrated γ-Fe 2 O 3 surface resulting in strongly negative ζ-potential (< −40 mV) of colloid even in acidic environment. In neutral and alkaline environment, ζ-potential of maghemite-based colloid drops below −55 mV; thus, HA should effectively stabilize the nanoparticle colloid over the whole pH range studied. Meanwhile, bare maghemite SPION at pH 3 -6 have ζ-potential in the +20 mV to −20 mV range (isoelectric point at pH 4.35), which is insufficient for electrostatic stabilization of the suspensions. The absence of embryotoxicity of HA-stabilized nanoparticles was demonstrated.

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Section: Introductionmentioning

confidence: 99%

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Goldt¹,

Polyakov²,

Sorkina³

et al. 2019

Nanosystems: Phys. Chem. Math.

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“…In fact, the number of such products has increased by more than 100% every year during the last decade. [1] This rapid progress can also be measured by the amount of international patent applications in the nanotechnology area, that is constantly growing, [2][3][4] guaranteeing the use of more nanoentities in future products. This constant demand for nanomaterials brings two issues that must be pointed out: the use of non-renewable resources and expensive raw materials and the generation of waste that contains nanoentieties, i.e.…”

Section: Introductionmentioning

confidence: 99%

Gold Recycling at Laboratory Scale: From Nanowaste to Nanospheres

et al. 2019

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The market for products based on nanotechnology increases day by day, and with it the use of nanomaterials and the generation of waste that contain nanowaste. Among the vast variety of nanomaterials available, gold nanoparticles (AuNPs) are within the most studied and applied ones in commercial products. This current situation requires both, the development of recovery methods to reduce the amount of produced nanowaste and new synthetic methods that allow the reuse of recovered gold for new nanomaterial production; in both cases keeping in mind economical and ecological reasons. In this work, a methodology to recover gold from aqueous laboratory nanowaste and to transform it into an aqueous HAuCl 4 solution was developed, using extremely simple procedures and easily available chemical reagents (NaCl, HCl, H 2 O 2), allowing the recovery of more than 99% of the original gold. The experiments were performed using both simulated and real laboratory nanowastes obtaining practically the same results. Moreover, the subsequent use of the obtained aqueous HAuCl 4 solution, from the recovered gold, to produce spherical AuNPs through a seed-mediated approach was demonstrated. Thus, this work presents, for the first time to the best of our knowledge, a complete recycling cycle from nanowaste, to the reagent and back to the nanomaterial.

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Quo vadis, worldwide nanoindustry?

Cited by 2 publications

References 9 publications

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Humic acid-stabilized superparamagnetic maghemite nanoparticles: surface charge and embryotoxicity evaluation

Gold Recycling at Laboratory Scale: From Nanowaste to Nanospheres

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