Formation of hollow silica nanospheres by reverse microemulsion

Cheng Han Lin, Jen Hsuan Chang, Yi Qi Yeh, Si Han Wu, Yi Hsin Liu, Chung Yuan Mou

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Uniform hollow silica nanospheres (HSNs) synthesized with reverse microemulsion have great application potential as nanoreactors because enzymes or nanocatalysts can be easily encapsulated de novo in synthesis. Water-in-oil (w/o) reverse microemulsions comprising the polymeric surfactant polyoxyethylene (5) isooctylphenyl ether (Igepal CA-520), ammonia and water in a continuous oil phase (alkanes) coalesce into size-tunable silica nanoparticles via diffusion aggregation after the introduction of silica precursors. Here, we elucidate in detail the growth mechanism for silica nanoparticles via nucleation of ammonium-catalyzed silica oligomers from tetraethylorthosilicate (TEOS) and nanoporous aminopropyltrimethoxy silane (APTS) in the reverse microemulsion system. The formation pathway was studied in situ with small-angle X-ray scattering (SAXS). We find a four-stage process showing a sigmoidal growth behavior in time with a crossover from the induction period, early nucleation stage, coalescence growth and a final slowing down of growth. Various characterizations (TEM, N2 isotherm, dynamic light scattering, zeta potential, NMR, elemental analysis) reveal the diameters, scattering length density (SLD), mesoporosity, surface potentials and chemical compositions of the HSNs. Oil phases of alkanes with different alkyl chains are systematically employed to tune the sizes of HSNs by varying oil molar volumes, co-solvent amounts or surfactant mixture ratios. Silica condensation is incomplete in the core region, with the silica source of TEOS and APTS leading to the hollow silica nanosphere after etching with warm water.

Original languageEnglish
Pages (from-to)9614-9626
Number of pages13
JournalNanoscale
Volume7
Issue number21
DOIs
Publication statusPublished - Jun 7 2015
Externally publishedYes

Fingerprint

Nanospheres
Microemulsions
Silicon Dioxide
Silica
Oils
Silanes
Alkanes
Surface-Active Agents
Paraffins
Water
Surface active agents
Nucleation
Nanoreactors
Nanoparticles
Surface potential
Dynamic light scattering
Zeta potential
X ray scattering
Chemical analysis
Coalescence

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Lin, C. H., Chang, J. H., Yeh, Y. Q., Wu, S. H., Liu, Y. H., & Mou, C. Y. (2015). Formation of hollow silica nanospheres by reverse microemulsion. Nanoscale, 7(21), 9614-9626. https://doi.org/10.1039/c5nr01395j

Formation of hollow silica nanospheres by reverse microemulsion. / Lin, Cheng Han; Chang, Jen Hsuan; Yeh, Yi Qi; Wu, Si Han; Liu, Yi Hsin; Mou, Chung Yuan.

In: Nanoscale, Vol. 7, No. 21, 07.06.2015, p. 9614-9626.

Research output: Contribution to journalArticle

Lin, CH, Chang, JH, Yeh, YQ, Wu, SH, Liu, YH & Mou, CY 2015, 'Formation of hollow silica nanospheres by reverse microemulsion', Nanoscale, vol. 7, no. 21, pp. 9614-9626. https://doi.org/10.1039/c5nr01395j
Lin, Cheng Han ; Chang, Jen Hsuan ; Yeh, Yi Qi ; Wu, Si Han ; Liu, Yi Hsin ; Mou, Chung Yuan. / Formation of hollow silica nanospheres by reverse microemulsion. In: Nanoscale. 2015 ; Vol. 7, No. 21. pp. 9614-9626.
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