A novel method to prepare chitosan/montmorillonite nanocomposites in the presence of hydroxy-aluminum oligomeric cations

Tan, Wei; Zhang, Yihe; Szeto, Yau Shan; Liao, Libing

doi:10.1016/j.compscitech.2007.10.007

Cited by 80 publications

(35 citation statements)

References 18 publications

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“…As shown in Fig. 2(a), in the spectrum of chitosan, there are two characteristic peaks at 1545 cm −1 and 1405 cm −1 , which correspond to the deformation vibration of the protonated amine group ( NH 3 + ) and hydroxyl group respectively [42,43]. The two peaks for the chitosan/HNTs nanocomposites slightly shift to higher frequencies (i.e.…”

Section: Interaction Between Hnts and Chitosanmentioning

confidence: 94%

Chitosan/halloysite nanotubes bionanocomposites: Structure, mechanical properties and biocompatibility

Liu

Zhang

et al. 2012

International Journal of Biological Macromolecules

281

149

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Section: Interaction Between Hnts and Chitosanmentioning

confidence: 94%

Chitosan/halloysite nanotubes bionanocomposites: Structure, mechanical properties and biocompatibility

Liu

Zhang

et al. 2012

International Journal of Biological Macromolecules

281

149

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“…The imbalance of the surface negative charges is compensated by exchangeable cations (typically Na + and Ca 2+ ). The parallel layers are linked together by weak electrostatic forces (Tan, Zhang, Szeto, & Liao, 2008). This type of clay is characterized by a moderate negative surface charge (cation exchange capacity, CEC), which is an important factor to define the equilibrium layer spacing.…”

Section: Nanoreinforcementsmentioning

confidence: 99%

Nanocomposites for food packaging applications

Azeredo

2009

Food Research International

1,045

515

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a b s t r a c tMost materials currently used for food packaging are non-degradable, generating environmental problems. Several biopolymers have been exploited to develop materials for eco-friendly food packaging. However, the use of biopolymers has been limited because of their usually poor mechanical and barrier properties, which may be improved by adding reinforcing compounds (fillers), forming composites. Most reinforced materials present poor matrix-filler interactions, which tend to improve with decreasing filler dimensions. The use of fillers with at least one nanoscale dimension (nanoparticles) produces nanocomposites. Nanoparticles have proportionally larger surface area than their microscale counterparts, which favors the filler-matrix interactions and the performance of the resulting material. Besides nanoreinforcements, nanoparticles can have other functions when added to a polymer, such as antimicrobial activity, enzyme immobilization, biosensing, etc. The main kinds of nanoparticles which have been studied for use in food packaging systems are overviewed, as well as their effects and applications.

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“…Recently, the results of researches on chitosan/clay nanocomposites to further improve their performance in various properties have been reported [8][9][10][11][12][13][14][15]. Darder et al [8] employed cationic biopolymer chitosan into Na + -montmorillonite (Na + -MMT), providing a -NH 3 + functional group for the anion exchange site as an anion sensor.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of chitosan/clay (nano)composites: a silanol quaternary ammonium intercalated clay

Chiu¹,

Lai²,

Hsieh³

et al. 2012

J Polym Res

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Chitosan/clay (nano)composites were prepared by using a special quaternary ammonium intercalating agent coupled with a silanol group to facilitate the organic clay formation. Exfoliated clay in the chitosan matrix was attained at the higher intercalant dosages through X-ray diffraction (XRD) and transmission electron microscope (TEM) analyses. Optical transmittance for the (nano)composites increased slightly with increasing the amount of intercalants in the clays. In light of the hydrophobic component on the intercalant and the effective clay content, the interfacial interaction between chitosan and modified clay may not be strong enough to render higher mechanical properties, even though the partially exfoliated clays were achieved to provide high interfacial area for the dispersed phase and the matrix. An optimum Young's modulus was thus found for (nano)composites using modified clay at a medium dosage of intercalant, which resulted from the balance of the dispersion status and interfacial interaction. This outcome indicated high dispersion of modified clay may not guarantee high mechanical properties of (nano)composites. The antimicrobial property of chitosan against Escherichia coli (E. coli) increased further with the addition of modified clays, in which the intercalant exhibiting the antimicrobial function. The modified clay at an optimum dosage of modifier to balance the mechanical properties and antimicrobial property was attained.

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A novel method to prepare chitosan/montmorillonite nanocomposites in the presence of hydroxy-aluminum oligomeric cations

Cited by 80 publications

References 18 publications

Chitosan/halloysite nanotubes bionanocomposites: Structure, mechanical properties and biocompatibility

Chitosan/halloysite nanotubes bionanocomposites: Structure, mechanical properties and biocompatibility

Nanocomposites for food packaging applications

Preparation and properties of chitosan/clay (nano)composites: a silanol quaternary ammonium intercalated clay

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