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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.


FTIR of different template-extracted SAM-MSM samples.
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Figure 7: FTIR of different template-extracted SAM-MSM samples.

Mentions: To confirm the grafting of the organosiloxanes onto the pore walls of MSNs, the samples were analyzed by solid state 29Si NMR and FTIR. The 29Si NMR spectra (Figure 6 and Table 2) show the presence of two additional peaks, T2 and T3 [T2 = R-Si-(OSi)2(OH), T3 = RSi-(OSi)3, R = organic groups] in the functionalized MSNs. These peaks are ascribed to the resonances of the incorporated organosiloxanes in the functionalized MSNs. FITR spectra further confirmed the functional groups grafted onto MSNs (Figure 7). The peaks around 2,800 to 2,970 cm−1, which were assigned to the aliphatic C-H vibrations, were observed in the Pr- (2,960, 2,930, 2,873 cm−1) and Is- (2,963, 2,939, 2,866 cm−1) SAM-MAN samples. The alkene C-H vibration (3,067 cm−1) and C = C stretching vibration (1,570, 1,607 cm−1) were observed in the Vi-SAM-MSN sample. The aromatic C-H (3,075, 3,055 cm − 1) and ring C = C (1,590, 1,432 cm-1) stretching vibrations were clearly observed in Ph-SAM-MSN sample.


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)

FTIR of different template-extracted SAM-MSM samples.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 7: FTIR of different template-extracted SAM-MSM samples.
Mentions: To confirm the grafting of the organosiloxanes onto the pore walls of MSNs, the samples were analyzed by solid state 29Si NMR and FTIR. The 29Si NMR spectra (Figure 6 and Table 2) show the presence of two additional peaks, T2 and T3 [T2 = R-Si-(OSi)2(OH), T3 = RSi-(OSi)3, R = organic groups] in the functionalized MSNs. These peaks are ascribed to the resonances of the incorporated organosiloxanes in the functionalized MSNs. FITR spectra further confirmed the functional groups grafted onto MSNs (Figure 7). The peaks around 2,800 to 2,970 cm−1, which were assigned to the aliphatic C-H vibrations, were observed in the Pr- (2,960, 2,930, 2,873 cm−1) and Is- (2,963, 2,939, 2,866 cm−1) SAM-MAN samples. The alkene C-H vibration (3,067 cm−1) and C = C stretching vibration (1,570, 1,607 cm−1) were observed in the Vi-SAM-MSN sample. The aromatic C-H (3,075, 3,055 cm − 1) and ring C = C (1,590, 1,432 cm-1) stretching vibrations were clearly observed in Ph-SAM-MSN sample.

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.