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Biodegradable polycaprolactone-titania nanocomposites: preparation, characterization and antimicrobial properties.

Muñoz-Bonilla A, Cerrada ML, Fernández-García M, Kubacka A, Ferrer M, Fernández-García M - Int J Mol Sci (2013)

Bottom Line: TEM evaluation provides evidence of an excellent nanometric dispersion of the oxide component in the polymeric matrix, with aggregates having an average size well below 100 nm.Presence of these TiO2 nanoparticles induces a nucleant effect during polymer crystallization.The bactericidal behavior has been explained through the analysis of the material optical properties, with a key role played by the creation of new electronic states within the polymer-based nanocomposites.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Ciencia y Tecnología de Polímeros (ICTP-CSIC), C/Juan de la Cierva 3, 28006 Madrid, Spain. sbonilla@ictp.csic.es.

ABSTRACT
Nanocomposites obtained from the incorporation of synthesized TiO2 nanoparticles (≈10 nm average primary particle size) in different amounts, ranging from 0.5 to 5 wt.%, into a biodegradable polycaprolactone matrix are achieved via a straightforward and commercial melting processing. The resulting nanocomposites have been structurally and thermally characterized by transmission electron microscopy (TEM), wide/small angle X-ray diffraction (WAXS/SAXS, respectively) and differential scanning calorimetry (DSC). TEM evaluation provides evidence of an excellent nanometric dispersion of the oxide component in the polymeric matrix, with aggregates having an average size well below 100 nm. Presence of these TiO2 nanoparticles induces a nucleant effect during polymer crystallization. Moreover, the antimicrobial activity of nanocomposites has been tested using both UV and visible light against Gram-negative Escherichia coli bacteria and Gram-positive Staphylococcus aureus. The bactericidal behavior has been explained through the analysis of the material optical properties, with a key role played by the creation of new electronic states within the polymer-based nanocomposites.

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TEM micrographs of the PCL-TiO2-2 nanocomposite.
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f4-ijms-14-09249: TEM micrographs of the PCL-TiO2-2 nanocomposite.

Mentions: To gain knowledge on how inorganic component is arranged within the PCL matrix, because of its impact in the final performance of the resulting materials, TEM analysis was carried out. Figure 4 shows a uniform dispersion of inorganic nanoparticles within the polymer for the PCL-TiO2-2 nanocomposite and the non-existence of TiO2 aggregates of a large size. This behavior parallels the one observed in the other TiO2-based nanocomposite systems [12,13,16,17] prepared by melting processing. The oxide is dispersed in the polymeric matrix exhibiting nanometer-scale aggregates ranging from 10 (the oxide primary particle size) to 180 nm, with an average size (Feret diameter) [35] of ca. 80 nm. The nanometric dispersion of the oxide attained in the loadings analyzed up to 5 wt.% is significant, considering that the titania preparation makes use of an oxide previously calcined at high temperature to ensure the exclusive presence of the anatase polymorph and, then, a strict control of its biocidal properties.


Biodegradable polycaprolactone-titania nanocomposites: preparation, characterization and antimicrobial properties.

Muñoz-Bonilla A, Cerrada ML, Fernández-García M, Kubacka A, Ferrer M, Fernández-García M - Int J Mol Sci (2013)

TEM micrographs of the PCL-TiO2-2 nanocomposite.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC3676781&req=5

f4-ijms-14-09249: TEM micrographs of the PCL-TiO2-2 nanocomposite.
Mentions: To gain knowledge on how inorganic component is arranged within the PCL matrix, because of its impact in the final performance of the resulting materials, TEM analysis was carried out. Figure 4 shows a uniform dispersion of inorganic nanoparticles within the polymer for the PCL-TiO2-2 nanocomposite and the non-existence of TiO2 aggregates of a large size. This behavior parallels the one observed in the other TiO2-based nanocomposite systems [12,13,16,17] prepared by melting processing. The oxide is dispersed in the polymeric matrix exhibiting nanometer-scale aggregates ranging from 10 (the oxide primary particle size) to 180 nm, with an average size (Feret diameter) [35] of ca. 80 nm. The nanometric dispersion of the oxide attained in the loadings analyzed up to 5 wt.% is significant, considering that the titania preparation makes use of an oxide previously calcined at high temperature to ensure the exclusive presence of the anatase polymorph and, then, a strict control of its biocidal properties.

Bottom Line: TEM evaluation provides evidence of an excellent nanometric dispersion of the oxide component in the polymeric matrix, with aggregates having an average size well below 100 nm.Presence of these TiO2 nanoparticles induces a nucleant effect during polymer crystallization.The bactericidal behavior has been explained through the analysis of the material optical properties, with a key role played by the creation of new electronic states within the polymer-based nanocomposites.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Ciencia y Tecnología de Polímeros (ICTP-CSIC), C/Juan de la Cierva 3, 28006 Madrid, Spain. sbonilla@ictp.csic.es.

ABSTRACT
Nanocomposites obtained from the incorporation of synthesized TiO2 nanoparticles (≈10 nm average primary particle size) in different amounts, ranging from 0.5 to 5 wt.%, into a biodegradable polycaprolactone matrix are achieved via a straightforward and commercial melting processing. The resulting nanocomposites have been structurally and thermally characterized by transmission electron microscopy (TEM), wide/small angle X-ray diffraction (WAXS/SAXS, respectively) and differential scanning calorimetry (DSC). TEM evaluation provides evidence of an excellent nanometric dispersion of the oxide component in the polymeric matrix, with aggregates having an average size well below 100 nm. Presence of these TiO2 nanoparticles induces a nucleant effect during polymer crystallization. Moreover, the antimicrobial activity of nanocomposites has been tested using both UV and visible light against Gram-negative Escherichia coli bacteria and Gram-positive Staphylococcus aureus. The bactericidal behavior has been explained through the analysis of the material optical properties, with a key role played by the creation of new electronic states within the polymer-based nanocomposites.

Show MeSH
Related in: MedlinePlus