Structural Insight into Chitosan Supports Functionalized with Nanoparticles

The incorporation of suspensions of nanoparticles functionalized with gallic acid (GA) was used as a strategy to obtain nanocomposite active films with different both chitosan: Tripolyphosphate (CH: TPP) and nanoparticles:chitosan (N: CH) ratios. The thermal analysis carried out by modulated differe...

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Publicado:	2018
Materias:	Chitin Chitosan Differential scanning calorimetry Fourier transform infrared spectroscopy Glass transition Nanocomposite films Nanocomposites Nanoparticles Positron annihilation spectroscopy Positrons Scanning electron microscopy Suspensions (fluids) Thermoanalysis Amorphous structures Crystalline size Functionalized Homogeneous distribution Modulated differential scanning calorimetry Positron annihilation lifetime spectroscopy Structural insights Tripolyphosphates Principal component analysis
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16878434_v2018_n_p_Lamarra http://hdl.handle.net/20.500.12110/paper_16878434_v2018_n_p_Lamarra
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_16878434_v2018_n_p_Lamarra
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spelling	paper:paper_16878434_v2018_n_p_Lamarra2023-06-08T16:26:44Z Structural Insight into Chitosan Supports Functionalized with Nanoparticles Chitin Chitosan Differential scanning calorimetry Fourier transform infrared spectroscopy Glass transition Nanocomposite films Nanocomposites Nanoparticles Positron annihilation spectroscopy Positrons Scanning electron microscopy Suspensions (fluids) Thermoanalysis Amorphous structures Crystalline size Functionalized Homogeneous distribution Modulated differential scanning calorimetry Positron annihilation lifetime spectroscopy Structural insights Tripolyphosphates Principal component analysis The incorporation of suspensions of nanoparticles functionalized with gallic acid (GA) was used as a strategy to obtain nanocomposite active films with different both chitosan: Tripolyphosphate (CH: TPP) and nanoparticles:chitosan (N: CH) ratios. The thermal analysis carried out by modulated differential scanning calorimetry (MDSC) allowed observing the shift of an endothermic event towards higher temperatures with a greater N: CH ratio. Analyzing ATR-FTIR spectra through principal component analysis (PCA) can be inferred that the incorporation of the nanoparticles produced a discrimination of the samples into clusters when the region 1400-1700 cm-1 was considered. The decrease in crystalline size with the inclusion of nanoparticles (NA and NB) proved the existence of interactions among CH, TPP, and GA, resulting in a more amorphous structure. The positron annihilation lifetime spectroscopy (PALS) technique was adequate to correlate the glass transition temperatures (Tg) obtained by using the MDSC technique with parameters τ2 and I2 ascribed to the annihilation of positrons in the interface. The cross section of nanocomposites obtained by scanning electron microscopy (SEM) clearly showed a homogeneous distribution of the nanoparticles without aggregation, suggesting their compatibility with the CH matrix. By virtue of the obtained results, the nanocomposites with the greatest nanoparticle proportion and the highest TPP concentration attained significant modifications in relation to CH matrices because of the crosslinking of the biopolymer with GA and TPP. © 2018 J. Lamarra et al. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16878434_v2018_n_p_Lamarra http://hdl.handle.net/20.500.12110/paper_16878434_v2018_n_p_Lamarra
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Chitin Chitosan Differential scanning calorimetry Fourier transform infrared spectroscopy Glass transition Nanocomposite films Nanocomposites Nanoparticles Positron annihilation spectroscopy Positrons Scanning electron microscopy Suspensions (fluids) Thermoanalysis Amorphous structures Crystalline size Functionalized Homogeneous distribution Modulated differential scanning calorimetry Positron annihilation lifetime spectroscopy Structural insights Tripolyphosphates Principal component analysis
spellingShingle	Chitin Chitosan Differential scanning calorimetry Fourier transform infrared spectroscopy Glass transition Nanocomposite films Nanocomposites Nanoparticles Positron annihilation spectroscopy Positrons Scanning electron microscopy Suspensions (fluids) Thermoanalysis Amorphous structures Crystalline size Functionalized Homogeneous distribution Modulated differential scanning calorimetry Positron annihilation lifetime spectroscopy Structural insights Tripolyphosphates Principal component analysis Structural Insight into Chitosan Supports Functionalized with Nanoparticles
topic_facet	Chitin Chitosan Differential scanning calorimetry Fourier transform infrared spectroscopy Glass transition Nanocomposite films Nanocomposites Nanoparticles Positron annihilation spectroscopy Positrons Scanning electron microscopy Suspensions (fluids) Thermoanalysis Amorphous structures Crystalline size Functionalized Homogeneous distribution Modulated differential scanning calorimetry Positron annihilation lifetime spectroscopy Structural insights Tripolyphosphates Principal component analysis
description	The incorporation of suspensions of nanoparticles functionalized with gallic acid (GA) was used as a strategy to obtain nanocomposite active films with different both chitosan: Tripolyphosphate (CH: TPP) and nanoparticles:chitosan (N: CH) ratios. The thermal analysis carried out by modulated differential scanning calorimetry (MDSC) allowed observing the shift of an endothermic event towards higher temperatures with a greater N: CH ratio. Analyzing ATR-FTIR spectra through principal component analysis (PCA) can be inferred that the incorporation of the nanoparticles produced a discrimination of the samples into clusters when the region 1400-1700 cm-1 was considered. The decrease in crystalline size with the inclusion of nanoparticles (NA and NB) proved the existence of interactions among CH, TPP, and GA, resulting in a more amorphous structure. The positron annihilation lifetime spectroscopy (PALS) technique was adequate to correlate the glass transition temperatures (Tg) obtained by using the MDSC technique with parameters τ2 and I2 ascribed to the annihilation of positrons in the interface. The cross section of nanocomposites obtained by scanning electron microscopy (SEM) clearly showed a homogeneous distribution of the nanoparticles without aggregation, suggesting their compatibility with the CH matrix. By virtue of the obtained results, the nanocomposites with the greatest nanoparticle proportion and the highest TPP concentration attained significant modifications in relation to CH matrices because of the crosslinking of the biopolymer with GA and TPP. © 2018 J. Lamarra et al.
title	Structural Insight into Chitosan Supports Functionalized with Nanoparticles
title_short	Structural Insight into Chitosan Supports Functionalized with Nanoparticles
title_full	Structural Insight into Chitosan Supports Functionalized with Nanoparticles
title_fullStr	Structural Insight into Chitosan Supports Functionalized with Nanoparticles
title_full_unstemmed	Structural Insight into Chitosan Supports Functionalized with Nanoparticles
title_sort	structural insight into chitosan supports functionalized with nanoparticles
publishDate	2018
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16878434_v2018_n_p_Lamarra http://hdl.handle.net/20.500.12110/paper_16878434_v2018_n_p_Lamarra
_version_	1768543676443656192

Structural Insight into Chitosan Supports Functionalized with Nanoparticles

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