DC conductivity and dielectric permittivity of collagen–chitosan films

Lima, Clara Taína Silva; Oliveira, Ricardo Santos; Figueiró, S.D.; Wehmann, Claus Franz; Góes, J.C.; Sombra, A. S. B.

doi:10.1016/j.matchemphys.2005.10.027

Cited by 82 publications

(50 citation statements)

References 13 publications

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“…This phase was identified as a broad region in the diffractogram and it was found in all the range. [17,18], which arises from the stretching vibration of C=O groups of amide groups in protein. The intense absorption observed at 1543 cm -1 is due to the Amide II mode, which arises from N-H stretching vibration strongly coupled to the C-N stretching vibration of collagen amide groups.…”

Section: Resultsmentioning

confidence: 99%

New ferrimagnetic biocomposite film based in collagen and yttrium iron garnet

Figueiró¹,

Mallmann²,

Góes³

et al. 2010

Express Polym. Lett.

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In recent years a great interest in the study of the association of magnetic with biological material for bioapplications has been observed in the literature. This work analyses the development of new magnetic biocomposite films from a magnetic ferrite and a biopolymer. Magnetic and dielectric properties of Y3Fe5O12 (YIG)/collagen composite films were studied as a function of the YIG concentration. This biocomposite was also characterized by Infrared Spectroscopy (IR), Thermal Analysis (DSC and TG) and scanning electron microspcopic (SEM) methods. The magnetization and dielectric measurements were performed at room temperature. The results demonstrated that ferrimagnetic garnet (YIG) and collagen (Col) can be used to obtain a homogeneous composite. All the composite films showed a ferromagnetic behavior and they were characterized as a soft magnet material. These results show that Col-YIG biocomposites are biological films with magnetic properties that can be employed as a versatile performance materials, due to their flexible dielectric and magnetic features. They could be used as electronic devices in biological applications

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Section: Resultsmentioning

confidence: 99%

New ferrimagnetic biocomposite film based in collagen and yttrium iron garnet

Figueiró¹,

Mallmann²,

Góes³

et al. 2010

Express Polym. Lett.

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“…This result indicates strong interaction between the nanoclay and polymer matrix through H-bonding (Deka and Karak 2009). Peaks at 900 and 1150 cm −1 were assigned to pyranose rings and amino groups, respectively (Lima et al 2006). No new functional group is seen after nanokaolin application, showing that only physical interaction was involved between the kaolin and the film matrix.…”

Section: Uv-visible (Uv-vis) and Ftir Spectramentioning

confidence: 96%

Preparation and characterization of bionanocomposite films reinforced with nano kaolin

et al. 2015

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Effects of nano-kaolin incorporation into semolina films on the physical, mechanical, thermal, barrier and antimicrobial properties of the resulting bio-nanocomposite films were investigated. The properties included crystal structure (by X-ray diffraction), mechanical resistance, color, Fourier transform infrared spectra, decomposition temperature, water-vapor permeability (WVP), oxygen permeability (OP), and antimicrobial activity against Staphylococcus aureus and Escherichia coli. Kaolin was incorporated into biofilms at various amounts (1, 2, 3, 4, and 5 %, w/w total solid). All films were plasticized with 50 % (w/w total solid) combination of sorbitol/glycerol at 3:1 ratio. The incorporation of nanokaolin into semolina films decreased OP and WVP. The moisture content and water solubility of the films were found to decrease by nanokaolin reinforcement, and mechanical properties of films were improved by increasing nanokaolin concentration. Tensile strength and Young's modulus increased from 3.41 to 5.44 MPa and from 63.12 to 136.18, respectively, and elongation-at-break decreased. The films did not exhibit UV absorption. In conclusion, nanokaolin incorporation enhanced the barrier and mechanical properties of semolina films, indicating the potential application of these bio-nanocomposites in food-product packaging.

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“…Another recent application of collagen in biomedicine is found in the formulation of membranes and hydrogels, products in which collagen interacts with another material to form a composite. The combination of collagen with chitosan is perhaps one of the most studied composites with practical emphasis on medicine, dentistry, and pharmacology (Lima et al, 2006). …”

Section: Collagen As Biomaterials and Applicationsmentioning

confidence: 99%

“…Lima et al (2006) detected that a more stable film can be obtained when the chitosan in a collagen-chitosan film reaches 50% because chitosan increases the organization of the microscopic structure of the collagen. The effect of solar radiation on the properties of collagen, chitosan, and collagenchitosan films, have been reported.…”

Section: Stabilitymentioning

confidence: 99%

“…Collagen in acid solution exhibited positively charged groups and it has a molecular interaction with chitosan ( Figure 4) with high potential to produce biocomposites with novel properties as was previously described (Liang et al, 2005;Lima et al, 2006;Sionkowska et al, 2006;Wess et al, 2004). Besides that, acid soluble collagen might be useful as a new source of plasticizer agent in the preparation of biofilms in composites with chitosan (Uriarte-Montoya et al, 2010).…”

Section: Applications Of Collagen/chitosan Blendsmentioning

confidence: 99%

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