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.
Science Translational Medicine 06 Mar 2019: Vol. 11, Issue 482, eaat0852. 4 Plat/tPA suppresses colitis and mucosal biopsy colon damage. (A to E) Plat+/−.
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.For reproduction of material from NJC:Reproduced from Ref. XX with permission from the Centre National de la RechercheScientifique (CNRS) and The Royal Society of Chemistry.For reproduction of material from PCCP:Reproduced from Ref.
XX with permission from the PCCP Owner Societies.For reproduction of material from PPS:Reproduced from Ref. XX with permission from the European Society for Photobiology,the European Photochemistry Association, and The Royal Society of Chemistry.For reproduction of material from all other RSC journals and books:Reproduced from Ref. XX with permission from The Royal Society of Chemistry.If the material has been adapted instead of reproduced from the original RSC publication'Reproduced from' can be substituted with 'Adapted from'.In all cases the Ref.
XX is the XXth reference in the list of references.If you are the author of this article you do not need to formally request permissionto reproduce figures, diagrams etc. Contained in this article in third party publicationsor in a thesis or dissertation provided that the correct acknowledgement is givenwith the reproduced material.Reproduced material should be attributed as follows.
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