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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.

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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.


Nitrogen sorption isotherm (a and b) and BJH pore size distribution of different SAM-MSNs.
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Figure 4: Nitrogen sorption isotherm (a and b) and BJH pore size distribution of different SAM-MSNs.

Mentions: The nitrogen adsorption-desorption isotherms and BJH pore size distributions for MSNs and SAM-MSNs are shown in Figure 4, the parameters of which are listed in Table 1. The BET surface area of the functionalized MSNs was about half the value of the pure MSN. The decrease in the surface areas is reasonable because the mass of MSNs increased significantly (by 60% to approximately 100%) after functionalization. The functionalization of MSNs also results in the reduction of pore volume and shrinkage of the BJH pore diameter (Table 1), which was ascribed to the lining of pore wall with the organic functional groups. The BET characterization shows that all SAM-MSNs show type IV sorption isotherms. These isotherm characterizations are consistent with the fact that the functional groups were grafted onto the pore walls, and few free polysiloxanes were trapped in the pores (Figure 5) [36,37].


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)

Nitrogen sorption isotherm (a and b) and BJH pore size distribution of different SAM-MSNs.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: Nitrogen sorption isotherm (a and b) and BJH pore size distribution of different SAM-MSNs.
Mentions: The nitrogen adsorption-desorption isotherms and BJH pore size distributions for MSNs and SAM-MSNs are shown in Figure 4, the parameters of which are listed in Table 1. The BET surface area of the functionalized MSNs was about half the value of the pure MSN. The decrease in the surface areas is reasonable because the mass of MSNs increased significantly (by 60% to approximately 100%) after functionalization. The functionalization of MSNs also results in the reduction of pore volume and shrinkage of the BJH pore diameter (Table 1), which was ascribed to the lining of pore wall with the organic functional groups. The BET characterization shows that all SAM-MSNs show type IV sorption isotherms. These isotherm characterizations are consistent with the fact that the functional groups were grafted onto the pore walls, and few free polysiloxanes were trapped in the pores (Figure 5) [36,37].

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.