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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 silica and 2,7-NAF.DM. This represents changes in the heat capacity of materials numbered as in Table 1. 3 The mechanical mixture of the vinylated silica with poly2,7-NAF.DM. The silica/polymer ratio was 2:1. The mechanical mixture of vinylated silica with polymer was obtained in a micro ball mill. 4 The silica with chemisorbed polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM on the vinylated silica surface. The silica/polymer ratio in the composite was 2:1 (sample 4 in Table 1)
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Fig2: DSC analysis of the composites based on modified silica and 2,7-NAF.DM. This represents changes in the heat capacity of materials numbered as in Table 1. 3 The mechanical mixture of the vinylated silica with poly2,7-NAF.DM. The silica/polymer ratio was 2:1. The mechanical mixture of vinylated silica with polymer was obtained in a micro ball mill. 4 The silica with chemisorbed polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM on the vinylated silica surface. The silica/polymer ratio in the composite was 2:1 (sample 4 in Table 1)

Mentions: It should be noted that the degradation rates at the main decomposition stages (closely to 300 and 350 °C) for mechanically mixed and chemisorbed polymer (samples 3 and 4, Fig. 1b) differed, which indicates changes in composite polymeric structure. According to the DSC data (Fig. 2), the mechanically mixed with vinylated silica polymer after elimination of the volatile products at 83 °C has phase transition in the interval 150–270 °C with maximum on the endotherm at 230 °C corresponding to the melting process, which is not accompanied by a weight loss on the TG curve. In the range 300–460 °C on the DSC curve, exotherms with maxima at 330 and 410 °C were observed. These exotherms apparently correspond to chemical interaction of silica surface with products of the polymer thermal decomposition or post-curing of polymer into the surface layer. For chemisorbed polymer, the weak change in heat capacity at 210–230 °C (Fig. 1c, sample 4) can be attributed to glass transition and it can testify an amorphous structure of the attached layer. Also for sample 4, the heat of exothermal process is larger for mechanically mixed polymer, especially at 330 °C.Fig. 2


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 silica and 2,7-NAF.DM. This represents changes in the heat capacity of materials numbered as in Table 1. 3 The mechanical mixture of the vinylated silica with poly2,7-NAF.DM. The silica/polymer ratio was 2:1. The mechanical mixture of vinylated silica with polymer was obtained in a micro ball mill. 4 The silica with chemisorbed polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM on the vinylated silica surface. The silica/polymer ratio in the composite was 2:1 (sample 4 in Table 1)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835396&req=5

Fig2: DSC analysis of the composites based on modified silica and 2,7-NAF.DM. This represents changes in the heat capacity of materials numbered as in Table 1. 3 The mechanical mixture of the vinylated silica with poly2,7-NAF.DM. The silica/polymer ratio was 2:1. The mechanical mixture of vinylated silica with polymer was obtained in a micro ball mill. 4 The silica with chemisorbed polymeric layer obtained via in situ grafted polymerization of the monomer 2,7-NAF.DM on the vinylated silica surface. The silica/polymer ratio in the composite was 2:1 (sample 4 in Table 1)
Mentions: It should be noted that the degradation rates at the main decomposition stages (closely to 300 and 350 °C) for mechanically mixed and chemisorbed polymer (samples 3 and 4, Fig. 1b) differed, which indicates changes in composite polymeric structure. According to the DSC data (Fig. 2), the mechanically mixed with vinylated silica polymer after elimination of the volatile products at 83 °C has phase transition in the interval 150–270 °C with maximum on the endotherm at 230 °C corresponding to the melting process, which is not accompanied by a weight loss on the TG curve. In the range 300–460 °C on the DSC curve, exotherms with maxima at 330 and 410 °C were observed. These exotherms apparently correspond to chemical interaction of silica surface with products of the polymer thermal decomposition or post-curing of polymer into the surface layer. For chemisorbed polymer, the weak change in heat capacity at 210–230 °C (Fig. 1c, sample 4) can be attributed to glass transition and it can testify an amorphous structure of the attached layer. Also for sample 4, the heat of exothermal process is larger for mechanically mixed polymer, especially at 330 °C.Fig. 2

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