Limits...
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 images of functionalized core-shell. TEM images of (a) Mn2O3@amino-functionalized silica (without TEOS), (b) Mn2O3@vinyl-functionalized silica, (c) Mn2O3@allyl-functionalized silica, and (d) Mn2O3@amino-functionalized silica (with TEOS).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3211221&req=5

Figure 2: TEM images of functionalized core-shell. TEM images of (a) Mn2O3@amino-functionalized silica (without TEOS), (b) Mn2O3@vinyl-functionalized silica, (c) Mn2O3@allyl-functionalized silica, and (d) Mn2O3@amino-functionalized silica (with TEOS).

Mentions: Figure 2a shows TEM image for Mn2O3@amino-functionalized silica particles with core diameter of 25-30 nm and shell thickness of 5 nm. Nanoparticles of Mn2O3@vinyl-functionalized silica (Figure 2b) show core-shell nanostructures with a core diameter of 25-30 nm and shell thickness of 5-10 nm. Cores with diameter of 25-30 nm with a shell thickness of 10-15 nm were observed (Figure 2c) for Mn2O3@allyl-functionalized silica. It is to be noted that the shell in the above three core-shell nanostructures is formed by the hydrolysis of organosilane precursors, which ensures that these core-shell nanostructures bear the respective functional groups (amine, vinyl, and allyl) on their surface. Core-shell nanostructures (amine groups over the shell) were obtained (Figure 2d) when the synthesis was carried out with TEOS and APTMS. The core size varied from 20 to 25 nm and a shell thickness was found to be 10 nm.


Enhanced functionalization of Mn2O3@SiO2 core-shell nanostructures.

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

TEM images of functionalized core-shell. TEM images of (a) Mn2O3@amino-functionalized silica (without TEOS), (b) Mn2O3@vinyl-functionalized silica, (c) Mn2O3@allyl-functionalized silica, and (d) Mn2O3@amino-functionalized silica (with TEOS).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: TEM images of functionalized core-shell. TEM images of (a) Mn2O3@amino-functionalized silica (without TEOS), (b) Mn2O3@vinyl-functionalized silica, (c) Mn2O3@allyl-functionalized silica, and (d) Mn2O3@amino-functionalized silica (with TEOS).
Mentions: Figure 2a shows TEM image for Mn2O3@amino-functionalized silica particles with core diameter of 25-30 nm and shell thickness of 5 nm. Nanoparticles of Mn2O3@vinyl-functionalized silica (Figure 2b) show core-shell nanostructures with a core diameter of 25-30 nm and shell thickness of 5-10 nm. Cores with diameter of 25-30 nm with a shell thickness of 10-15 nm were observed (Figure 2c) for Mn2O3@allyl-functionalized silica. It is to be noted that the shell in the above three core-shell nanostructures is formed by the hydrolysis of organosilane precursors, which ensures that these core-shell nanostructures bear the respective functional groups (amine, vinyl, and allyl) on their surface. Core-shell nanostructures (amine groups over the shell) were obtained (Figure 2d) when the synthesis was carried out with TEOS and APTMS. The core size varied from 20 to 25 nm and a shell thickness was found to be 10 nm.

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.