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. 2018 Oct 11;8(10):817.
doi: 10.3390/nano8100817.

Layered-Expanded Mesostructured Silicas: Generalized Synthesis and Functionalization

Pedro Burguete  1 , José Manuel Morales  2 , Lorenzo Fernández  3 , Jamal El Haskouri  4 , Julio Latorre  5 , Carmen Guillem  6 , Francisco Pérez-Pla  7 , Ana Cros  8 , Daniel Beltrán  9 , Aurelio Beltrán  10 , Pedro Amorós  11
Affiliations

Layered-Expanded Mesostructured Silicas: Generalized Synthesis and Functionalization

Pedro Burguete et al. Nanomaterials (Basel). .

Abstract

Mesostructured layered silicas have been prepared through a surfactant-assisted procedure using neutral alkylamines as templates and starting from atrane complexes as hydrolytic inorganic precursors. By adjusting the synthetic parameters, this kinetically controlled reproducible one-pot method allows for obtaining both pure and functionalized (inorganic or organically) lamellar silica frameworks. These are easily deconstructed and built up again, which provides a simple way for expanding the interlamellar space. The materials present high dispersibility, which results in stable colloidal suspensions.

Keywords: amorphous silica; dispersion; functionalization; layered materials.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Low-angle X-ray powder diffraction (XRD) patterns of UVM-L16 solids synthesized by using different C16/Si molar ratio: (a) 0.125, (b) 0.25, (c) 0.5, (d) 0.75, and (e) 1.
Figure 2
Figure 2
Evolution of the interlayer space vs. the number of carbon atoms in the alkylamine surfactant tail.
Figure 3
Figure 3
FTIR spectra of samples (a) UVM-L18, (b) UVM-L16, (c) UVM-L14, (d) UVM-L12, (e) UVM-L10, and (f) UVM-L8. (i) Stretching C–H modes. (ii) Bending H–C–H modes. (iii) Stretching N–H bonds.
Figure 4
Figure 4
Transmission electron microscopy (TEM) images of (a) sample UVM-L18, (b) and (c) UVM-L18 sample embedded in LR-white resin. (d) Line profile of the image intensity of the Si atomic row. Two-dimensional (e) and 3D (f) Atomic force microscopy (AFM) images of sample UVM-L18. (g) Height vs. position along the line indicated in the (e) image.
Figure 5
Figure 5
Gaussian deconvolution of the 29Si MAS NMR spectrum of sample UVM-L12.
Figure 6
Figure 6
(i) Low-angle XRD patterns of samples (a) UVM-L16 and the Al modified solids Al-UVM-L16 with different Al content (Si/Al real molar ratio): (b) 22, (c) 7, (d) 5, and (e) 3. (ii) 27Al MAS NMR spectra of Al-UVM-L16 samples with different Al content (Si/Al real molar ratio): (a) 22, (b) 7, and (c) 5.
Figure 7
Figure 7
Gaussian deconvolution of the 29Si MAS NMR spectrum of Epoxy-UVM-L12 sample.
Figure 8
Figure 8
XRD patterns of (a) UVM-L12, (b) collapsed surfactant-free UVM-L12, and (c) rebuild expanded phase using C18 as a surfactant.
Figure 9
Figure 9
Laser diffraction particle size distribution of UVM-L16 in (a) ethanol and (b) DMF.
See this image and copyright information in PMC

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