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Functionalized self-assembled monolayers on mesoporous silica nanoparticles with high surface coverage.

Wei L, Shi D, Zhou Z, Ye P, Wang J, Zhao J, Liu L, Chen C, Zhang Y - Nanoscale Res Lett (2012)

Bottom Line: Mesoporous silica nanoparticles (MSNs) containing vinyl-, propyl-, isobutyl- and phenyl functionalized monolayers were reported.These functionalized MSNs were prepared via molecular self-assembly of organosilanes on the mesoporous supports.The relative surface coverage of the organic monolayers can reach up to 100% (about 5.06 silanes/nm.

View Article: PubMed Central - HTML - PubMed

ABSTRACT
Mesoporous silica nanoparticles (MSNs) containing vinyl-, propyl-, isobutyl- and phenyl functionalized monolayers were reported. These functionalized MSNs were prepared via molecular self-assembly of organosilanes on the mesoporous supports. The relative surface coverage of the organic monolayers can reach up to 100% (about 5.06 silanes/nm.

No MeSH data available.


The XRD spectra of MSN and different SAM-MSNs.
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Figure 3: The XRD spectra of MSN and different SAM-MSNs.

Mentions: Figure 2 shows the TEM of MSNs and the SAM-MSN samples with different functional groups. It could be found that both MSNs and SAM-MSN samples were comprised of MCM-41-type, hexagonal array of mesoporous channels, suggesting the functionalization of MSNs with organic monolayer did not destruct the order hexagonal array of mesoporous channels. From TEM pictures, no free non-porous silica particles were observed in all SAM-MSN samples. This result confirmed that all organic functional groups were anchored on the surface of MSNs. The TEM images also show that the pores are still open even though the 100% of full surface was covered by functional groups (Figure 2b). The powder X-ray diffraction pattern (XRD) of SAM-MSNs further confirmed the retention of the hexagonal symmetry of the porous structure (Figure 3) after functionalization, as evidenced by the distinct d001 peak in all SAM-MSN samples. However, compared with the XRD of pure MSN sample, a lower contrast of XRD and a slight decrease in the d001 values were observed. This change in the XRD could be attributed to the covalent linkage of organic groups onto the pore walls [34,35].


Functionalized self-assembled monolayers on mesoporous silica nanoparticles with high surface coverage.

Wei L, Shi D, Zhou Z, Ye P, Wang J, Zhao J, Liu L, Chen C, Zhang Y - Nanoscale Res Lett (2012)

The XRD spectra of MSN and different SAM-MSNs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3475074&req=5

Figure 3: The XRD spectra of MSN and different SAM-MSNs.
Mentions: Figure 2 shows the TEM of MSNs and the SAM-MSN samples with different functional groups. It could be found that both MSNs and SAM-MSN samples were comprised of MCM-41-type, hexagonal array of mesoporous channels, suggesting the functionalization of MSNs with organic monolayer did not destruct the order hexagonal array of mesoporous channels. From TEM pictures, no free non-porous silica particles were observed in all SAM-MSN samples. This result confirmed that all organic functional groups were anchored on the surface of MSNs. The TEM images also show that the pores are still open even though the 100% of full surface was covered by functional groups (Figure 2b). The powder X-ray diffraction pattern (XRD) of SAM-MSNs further confirmed the retention of the hexagonal symmetry of the porous structure (Figure 3) after functionalization, as evidenced by the distinct d001 peak in all SAM-MSN samples. However, compared with the XRD of pure MSN sample, a lower contrast of XRD and a slight decrease in the d001 values were observed. This change in the XRD could be attributed to the covalent linkage of organic groups onto the pore walls [34,35].

Bottom Line: Mesoporous silica nanoparticles (MSNs) containing vinyl-, propyl-, isobutyl- and phenyl functionalized monolayers were reported.These functionalized MSNs were prepared via molecular self-assembly of organosilanes on the mesoporous supports.The relative surface coverage of the organic monolayers can reach up to 100% (about 5.06 silanes/nm.

View Article: PubMed Central - HTML - PubMed

ABSTRACT
Mesoporous silica nanoparticles (MSNs) containing vinyl-, propyl-, isobutyl- and phenyl functionalized monolayers were reported. These functionalized MSNs were prepared via molecular self-assembly of organosilanes on the mesoporous supports. The relative surface coverage of the organic monolayers can reach up to 100% (about 5.06 silanes/nm.

No MeSH data available.