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Enhanced functionalization of Mn2O3@SiO2 core-shell nanostructures.

Vaidya S, Thaplyal P, Ganguli AK - Nanoscale Res Lett (2011)

Bottom Line: The high density of functional groups can be used for extraction of elements present in trace amounts.These functionalized core-shell nanostructures were characterized using TEM, IR, and zeta potential studies.The amino-functionalized core-shell nanostructures were used for the immobilization of glucose and L-methionine and were characterized by zeta potential studies.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India. ashok@chemistry.iitd.ernet.in.

ABSTRACT
Core-shell nanostructures of Mn2O3@SiO2, Mn2O3@amino-functionalized silica, Mn2O3@vinyl-functionalized silica, and Mn2O3@allyl-functionalized silica were synthesized using the hydrolysis of the respective organosilane precursor over Mn2O3 nanoparticles dispersed using colloidal solutions of Tergitol and cyclohexane. The synthetic methodology used is an improvement over the commonly used post-grafting or co-condensation method as it ensures a high density of functional groups over the core-shell nanostructures. The high density of functional groups can be useful in immobilization of biomolecules and drugs and thus can be used in targeted drug delivery. The high density of functional groups can be used for extraction of elements present in trace amounts. These functionalized core-shell nanostructures were characterized using TEM, IR, and zeta potential studies. The zeta potential study shows that the hydrolysis of organosilane to form the shell results in more number of functional groups on it as compared to the shell formed using post-grafting method. The amino-functionalized core-shell nanostructures were used for the immobilization of glucose and L-methionine and were characterized by zeta potential studies.

No MeSH data available.


TEM and HRTEM image. (a) TEM and (b) HRTEM images of Mn2O3@SiO2 core-shell nanostructures.
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Figure 1: TEM and HRTEM image. (a) TEM and (b) HRTEM images of Mn2O3@SiO2 core-shell nanostructures.

Mentions: TEM image of Mn2O3@SiO2 core-shell nanostructures shows cores with size ranging from 25 to 100 nm with a shell thickness of 5 nm (Figure 1a). The presence of amorphous silica shell was clearly observed in the TEM image. The synthetic methodology utilizes already synthesized Mn2O3 nanoparticles which has been prepared from the route known in the literature [32]. HRTEM image (Figure 1b) shows lattice fringes corresponding to (111) plane of Mn2O3. The amorphous silica shell was clearly observed surrounding the crystalline core in the high resolution TEM image (Figure 1b). Thus HRTEM of Mn2O3@SiO2 core-shell nanostructures confirms the chemical composition of core as Mn2O3 and shell as amorphous silica.


Enhanced functionalization of Mn2O3@SiO2 core-shell nanostructures.

Vaidya S, Thaplyal P, Ganguli AK - Nanoscale Res Lett (2011)

TEM and HRTEM image. (a) TEM and (b) HRTEM images of Mn2O3@SiO2 core-shell nanostructures.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211221&req=5

Figure 1: TEM and HRTEM image. (a) TEM and (b) HRTEM images of Mn2O3@SiO2 core-shell nanostructures.
Mentions: TEM image of Mn2O3@SiO2 core-shell nanostructures shows cores with size ranging from 25 to 100 nm with a shell thickness of 5 nm (Figure 1a). The presence of amorphous silica shell was clearly observed in the TEM image. The synthetic methodology utilizes already synthesized Mn2O3 nanoparticles which has been prepared from the route known in the literature [32]. HRTEM image (Figure 1b) shows lattice fringes corresponding to (111) plane of Mn2O3. The amorphous silica shell was clearly observed surrounding the crystalline core in the high resolution TEM image (Figure 1b). Thus HRTEM of Mn2O3@SiO2 core-shell nanostructures confirms the chemical composition of core as Mn2O3 and shell as amorphous silica.

Bottom Line: The high density of functional groups can be used for extraction of elements present in trace amounts.These functionalized core-shell nanostructures were characterized using TEM, IR, and zeta potential studies.The amino-functionalized core-shell nanostructures were used for the immobilization of glucose and L-methionine and were characterized by zeta potential studies.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi 110016, India. ashok@chemistry.iitd.ernet.in.

ABSTRACT
Core-shell nanostructures of Mn2O3@SiO2, Mn2O3@amino-functionalized silica, Mn2O3@vinyl-functionalized silica, and Mn2O3@allyl-functionalized silica were synthesized using the hydrolysis of the respective organosilane precursor over Mn2O3 nanoparticles dispersed using colloidal solutions of Tergitol and cyclohexane. The synthetic methodology used is an improvement over the commonly used post-grafting or co-condensation method as it ensures a high density of functional groups over the core-shell nanostructures. The high density of functional groups can be useful in immobilization of biomolecules and drugs and thus can be used in targeted drug delivery. The high density of functional groups can be used for extraction of elements present in trace amounts. These functionalized core-shell nanostructures were characterized using TEM, IR, and zeta potential studies. The zeta potential study shows that the hydrolysis of organosilane to form the shell results in more number of functional groups on it as compared to the shell formed using post-grafting method. The amino-functionalized core-shell nanostructures were used for the immobilization of glucose and L-methionine and were characterized by zeta potential studies.

No MeSH data available.