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Controlled aggregation of the core(amorphous silica)@shell(TPA+ - polysilicates) nanoparticles at room temperature by selective removal of TPA+ ions from the nanoparticle shell


Bosnar, Sanja; Dutour Sikirić, Maja; Smrečki, Vilko; Bronić, Josip; Šegota, Suzana; Strasser, Vida; Antonić Jelić, Tatjana; Palčić, Ana; Subotić, Boris
Controlled aggregation of the core(amorphous silica)@shell(TPA+ - polysilicates) nanoparticles at room temperature by selective removal of TPA+ ions from the nanoparticle shell // Inorganic Chemistry Frontiers, 6 (2019), 7; 1639-1653 doi:10.1039/c9qi00200f (međunarodna recenzija, članak, znanstveni)


Naslov
Controlled aggregation of the core(amorphous silica)@shell(TPA+ - polysilicates) nanoparticles at room temperature by selective removal of TPA+ ions from the nanoparticle shell

Autori
Bosnar, Sanja ; Dutour Sikirić, Maja ; Smrečki, Vilko ; Bronić, Josip ; Šegota, Suzana ; Strasser, Vida ; Antonić Jelić, Tatjana ; Palčić, Ana ; Subotić, Boris

Izvornik
Inorganic Chemistry Frontiers (2052-1553) 6 (2019), 7; 1639-1653

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Core@shell silica nanoparticles ; composition of nanoparticle shell ; removal of the TPA+ ions from the nanoparticle core ; controlled aggregation of the primary silica nanoparticles ; influence of the amount and mode of addition of NaOH on the size and structure of aggregates

Sažetak
The influence of small inorganic cations (Na+ ions in this case) on core@shell silica nanoparticles, formed by the room temperature hydrolysis of TEOS in aqueous TPAOH (subsequent addition of NaOH – SA) and NaOH/TPAOH (direct addition of NaOH – DA) solutions, was investigated by DLS, AFM, pH measurements, 29Si-NMR and 23Na-NMR. The obtained results showed that smaller Na+ ions displace some of the larger TPA+ ions from the shells of the core@shell primary silica nanoparticles (PNPs), by the exchange process. This causes exposure of TPA-free terminal OH and O- groups to the solution and thus enables the binding of the collided nanoparticles by ≡Si–O–Si≡ bonds (aggregation). The PNPs in the aggregates formed above the critical aggregation concentration (CAC) of silicate species are separated by the “bulky” shell (TPA-polysilicate anions) that prevents close contact between the nanoparticle cores and thus their coalescence. When Na+ ions are present during the formation of the nanoparticles, some of the Na+ ions are incorporated into the nanoparticle core. Removal of the TPA+ ions from the shells of the nanoparticles formed below the CAC enables close contact of the nanoparticle cores and thus their coalescence inside the aggregates. These findings show that the selective removal of the TPA+ ions from the nanoparticle shell enables the control of the composition and size of the precursor species and thus represents a good basis for the engineering of nanosized (alumino)silicate microporous and mesoporous materials.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekt / tema
HRZZ-IP-2016-06-2214 - Sinteza naprednih anorganskih katalizatora s povećanim brojem kiselih mjesta (Josip Bronić, )
HRZZ-IP-2016-06-8415 - Zaštitni mehanizmi i učinci flavonoida ugrađenih u nanonosače u modelnim membranama i neuronima (Suzana Šegota, )

Ustanove
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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