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Immobilization of Polymeric Luminophor on Nanoparticles Surface.

Bolbukh Y, Podkoscielna B, Lipke A, Bartnicki A, Gawdzik B, Tertykh V - Nanoscale Res Lett (2016)

Bottom Line: Obtained results confirm the chemisorption of luminophor on the nanotubes and silica nanoparticles at the elaborated synthesis techniques.The microstructure of 2,7-NAF.DM molecules after chemisorption was found to be not changed.The elaborated modification approach allows one to obtain nanoparticles uniformly covered with polymeric luminophor.

View Article: PubMed Central - PubMed

Affiliation: Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Str., 03164, Kyiv, Ukraine. yu_bolbukh@yahoo.com.

ABSTRACT
Polymeric luminophors with reduced toxicity are of the priorities in the production of lighting devices, sensors, detectors, bioassays or diagnostic systems. The aim of this study was to develop a method of immobilization of the new luminophor on a surface of nanoparticles and investigation of the structure of the grafted layer. Monomer 2,7-(2-hydroxy-3-methacryloyloxypropoxy)naphthalene (2,7-NAF.DM) with luminophoric properties was immobilized on silica and carbon nanotubes in two ways: mechanical mixing with previously obtained polymer and by in situ oligomerization with chemisorption after carrier's modification with vinyl groups. The attached polymeric (or oligomeric) surface layer was studied using thermal and spectral techniques. Obtained results confirm the chemisorption of luminophor on the nanotubes and silica nanoparticles at the elaborated synthesis techniques. The microstructure of 2,7-NAF.DM molecules after chemisorption was found to be not changed. The elaborated modification approach allows one to obtain nanoparticles uniformly covered with polymeric luminophor.

No MeSH data available.


Related in: MedlinePlus

DSC analysis of the composites based on modified multiwalled carbon nanotubes and 2,7-NAF.DM. 5 Carbon nanotubes mechanically mixed with the poly2,7-NAF.DM with the MWCNTs/polymer ratio 1:10; 6 carbon nanotubes with the polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM with the MWCNTs/polymer ratio 1:10; 7 carbon nanotubes with the polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM with the MWCNTs/polymer ratio 1:40
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Fig4: DSC analysis of the composites based on modified multiwalled carbon nanotubes and 2,7-NAF.DM. 5 Carbon nanotubes mechanically mixed with the poly2,7-NAF.DM with the MWCNTs/polymer ratio 1:10; 6 carbon nanotubes with the polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM with the MWCNTs/polymer ratio 1:10; 7 carbon nanotubes with the polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM with the MWCNTs/polymer ratio 1:40

Mentions: As well as for the mechanical blend of the polymer with silica (Fig. 2), at heating of carbon nanotubes mixed with the polymer in the region near 223 °C on the DSC curve, the endotherm is detected (Fig. 4, curve 5), but in this case, the process is followed by the weight loss on the TGA curve (Fig. 3, curve 5). However, the endothermic peak at 258 °C (Fig. 4, curve 5) can be attributed to the polymer melting. In the temperature region of the polymer depolymerization, the exotherm at 330 °C, earlier marked for the composite with silica (sample 3, Table 1), was not observed and the exothermal process at 403 °C corresponding to post-curing of polymer goes into endothermic decomposition reaction (Fig. 4, curve 5). The endotherm at 430 °C corresponds to benzene ring degradation. At the polymer chemisorption in the low-temperature region (Fig. 4, curves 6 and 7), appearance of exotherms on the DSC curves testifies the chemical interaction in the grafted layer. At temperatures above 300 °C, the character of the DSC curves of samples 6 and 7 is similar to that of composite 4 (polymer chemisorption on the silica surface), but the heat of the process is increased. With the grafted polymer content increasing (samples 6 and 7), a heat of the exothermic process at 100–200 °C decreased with extremum shift towards high temperatures (Fig. 4, curve 7), which may be due to compaction of the polymeric layer grafted to the surface.Fig. 4


Immobilization of Polymeric Luminophor on Nanoparticles Surface.

Bolbukh Y, Podkoscielna B, Lipke A, Bartnicki A, Gawdzik B, Tertykh V - Nanoscale Res Lett (2016)

DSC analysis of the composites based on modified multiwalled carbon nanotubes and 2,7-NAF.DM. 5 Carbon nanotubes mechanically mixed with the poly2,7-NAF.DM with the MWCNTs/polymer ratio 1:10; 6 carbon nanotubes with the polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM with the MWCNTs/polymer ratio 1:10; 7 carbon nanotubes with the polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM with the MWCNTs/polymer ratio 1:40
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Fig4: DSC analysis of the composites based on modified multiwalled carbon nanotubes and 2,7-NAF.DM. 5 Carbon nanotubes mechanically mixed with the poly2,7-NAF.DM with the MWCNTs/polymer ratio 1:10; 6 carbon nanotubes with the polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM with the MWCNTs/polymer ratio 1:10; 7 carbon nanotubes with the polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM with the MWCNTs/polymer ratio 1:40
Mentions: As well as for the mechanical blend of the polymer with silica (Fig. 2), at heating of carbon nanotubes mixed with the polymer in the region near 223 °C on the DSC curve, the endotherm is detected (Fig. 4, curve 5), but in this case, the process is followed by the weight loss on the TGA curve (Fig. 3, curve 5). However, the endothermic peak at 258 °C (Fig. 4, curve 5) can be attributed to the polymer melting. In the temperature region of the polymer depolymerization, the exotherm at 330 °C, earlier marked for the composite with silica (sample 3, Table 1), was not observed and the exothermal process at 403 °C corresponding to post-curing of polymer goes into endothermic decomposition reaction (Fig. 4, curve 5). The endotherm at 430 °C corresponds to benzene ring degradation. At the polymer chemisorption in the low-temperature region (Fig. 4, curves 6 and 7), appearance of exotherms on the DSC curves testifies the chemical interaction in the grafted layer. At temperatures above 300 °C, the character of the DSC curves of samples 6 and 7 is similar to that of composite 4 (polymer chemisorption on the silica surface), but the heat of the process is increased. With the grafted polymer content increasing (samples 6 and 7), a heat of the exothermic process at 100–200 °C decreased with extremum shift towards high temperatures (Fig. 4, curve 7), which may be due to compaction of the polymeric layer grafted to the surface.Fig. 4

Bottom Line: Obtained results confirm the chemisorption of luminophor on the nanotubes and silica nanoparticles at the elaborated synthesis techniques.The microstructure of 2,7-NAF.DM molecules after chemisorption was found to be not changed.The elaborated modification approach allows one to obtain nanoparticles uniformly covered with polymeric luminophor.

View Article: PubMed Central - PubMed

Affiliation: Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Str., 03164, Kyiv, Ukraine. yu_bolbukh@yahoo.com.

ABSTRACT
Polymeric luminophors with reduced toxicity are of the priorities in the production of lighting devices, sensors, detectors, bioassays or diagnostic systems. The aim of this study was to develop a method of immobilization of the new luminophor on a surface of nanoparticles and investigation of the structure of the grafted layer. Monomer 2,7-(2-hydroxy-3-methacryloyloxypropoxy)naphthalene (2,7-NAF.DM) with luminophoric properties was immobilized on silica and carbon nanotubes in two ways: mechanical mixing with previously obtained polymer and by in situ oligomerization with chemisorption after carrier's modification with vinyl groups. The attached polymeric (or oligomeric) surface layer was studied using thermal and spectral techniques. Obtained results confirm the chemisorption of luminophor on the nanotubes and silica nanoparticles at the elaborated synthesis techniques. The microstructure of 2,7-NAF.DM molecules after chemisorption was found to be not changed. The elaborated modification approach allows one to obtain nanoparticles uniformly covered with polymeric luminophor.

No MeSH data available.


Related in: MedlinePlus