A new insight into growth mechanism and kinetics of mesoporous silica nanoparticles by in situ small angle x-ray scattering

Yi, Zhifeng, Dumée, Ludovic F., Garvey, Christopher J., Feng, Chunfang, She, Fenghua, Rookes, James E., Mudie, Stephen, Cahill, David M. and Kong, Lingxue 2015, A new insight into growth mechanism and kinetics of mesoporous silica nanoparticles by in situ small angle x-ray scattering, Langmuir, vol. 31, no. 30, pp. 8478-8487, doi: 10.1021/acs.langmuir.5b01637.

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Title A new insight into growth mechanism and kinetics of mesoporous silica nanoparticles by in situ small angle x-ray scattering
Author(s) Yi, ZhifengORCID iD for Yi, Zhifeng orcid.org/0000-0001-8987-9514
Dumée, Ludovic F.ORCID iD for Dumée, Ludovic F. orcid.org/0000-0002-0264-4024
Garvey, Christopher J.
Feng, Chunfang
She, FenghuaORCID iD for She, Fenghua orcid.org/0000-0001-8191-0820
Rookes, James E.ORCID iD for Rookes, James E. orcid.org/0000-0003-1479-2339
Mudie, Stephen
Cahill, David M.ORCID iD for Cahill, David M. orcid.org/0000-0002-2556-0528
Kong, LingxueORCID iD for Kong, Lingxue orcid.org/0000-0001-6219-3897
Journal name Langmuir
Volume number 31
Issue number 30
Start page 8478
End page 8487
Total pages 10
Publisher American Chemical Society
Place of publication Washington, DC
Publication date 2015-08-04
ISSN 1520-5827
Summary The growth mechanism and kinetics of mesoporous silica nanoparticles (MSNs) were investigated for the first time by using a synchrotron time-resolved small-angle X-ray scattering (SAXS) analysis. The synchrotron SAXS offers unsurpassed time resolution and the ability to detect structural changes of nanometer sized objects, which are beneficial for the understanding of the growth mechanism of small MSNs (∼20 nm). The Porod invariant was used to quantify the conversion of tetraethyl orthosilicate (TEOS) in silica during MSN formation, and the growth kinetics were investigated at different solution pH and temperature through calculating the scattering invariant as a function of reaction time. The growth of MSNs was found to be accelerated at high temperature and high pH, resulting in a higher rate of silica formation. Modeling SAXS data of micelles, where a well-defined electrostatic interaction is assumed, determines the size and shape of hexadecyltrimethylammonium bromide (CTAB) micelles before and after the addition of TEOS. The results suggested that the micelle size increases and the micelle shape changes from ellipsoid to spherical, which might be attributed to the solubilization of TEOS in the hydrophobic core of CTAB micelles. A new "swelling-shrinking" mechanism is proposed. The mechanism provides new insights into understanding MSN growth for the formation of functional mesoporous materials exhibiting controlled morphologies. The SAXS analyses were correlated to the structure of CTAB micelles and chemical reaction of TEOS. This study has provided critical information to an understanding of the growth kinetics and mechanism of MSNs.
Language eng
DOI 10.1021/acs.langmuir.5b01637
Field of Research 030205 Non-Metal Chemistry
091201 Ceramics
Socio Economic Objective 861002 Ceramics
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30075878

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