Role of rheological properties on physical chitosan aerogels obtained by supercritical drying

Baldino, Lucia; Misol, Alexander; Cardea, Stefano; Valle, Eva M. Martín del

doi:10.1016/j.carbpol.2020.115850

Cited by 32 publications

(14 citation statements)

References 32 publications

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“…Furthermore, a progressive increase in the shear stress provokes the alignment of the different polymeric structures and the viscosity is reduced until reaching a Newtonian behavior. This phenomenon has been already reported for a high number of polymeric solutions, such as chitosan [31], and is illustrated in Figure 1a for alginate and Figure S1 (Supplementary Material) for chitosan. Moreover, the results can be explained with the parameters (Table 1) that were obtained after modelling the shear stress-shear rate with equation 1 (Cross model).…”

Section: Steady Flow Test For Solutions Of Polysaccharidessupporting

confidence: 76%

Steady and Oscillatory Shear Flow Behavior of Different Polysaccharides with Laponite®

2021

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The rheological behavior, in terms of steady and oscillatory shear flow, of Laponite® with different polysaccharides (alginate, chitosan, xanthan gum and levan) in salt-free solutions was studied. Results showed that a higher polymer concentration increased the zero-rate viscosity and decreased the critical strain rate (Cross model fit) as well as increasing the elastic and viscous moduli. Those properties (zero-rate viscosity and critical strain rate) can be a suitable indicator of the effect of the Laponite® on the shear flow behavior for the different solutions. Specifically, the effect of the Laponite® predominates for solutions with large critical strain rate and low zero-rate viscosity, modifying significantly the previous parameters and even the yield stress (if existing). On the other hand, larger higher polymeric concentration hinders the formation of the platelet structure, and polymer entanglement becomes predominant. Furthermore, the addition of high concentrations of Laponite® increases the elastic nature, but without modifying the typical mechanical spectra for polymeric solutions. Finally, Laponite® was added to (previously crosslinked) gels of alginate and chitosan, obtaining different results depending on the material. These results highlight the possibility of predicting qualitatively the impact of the Laponite® on different polymeric solutions depending on the solutions properties.

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Section: Steady Flow Test For Solutions Of Polysaccharidessupporting

confidence: 76%

Steady and Oscillatory Shear Flow Behavior of Different Polysaccharides with Laponite®

2021

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“…The use of supercritical CO 2 can overcome the previous drawbacks, promoting the formation of aerogels with a high surface area in a shorter time. Although supercritical drying has been widely used to obtain chitosan aerogels [ 104 ], only one article in the table used this technique to produce composite aerogels.…”

Section: Chitosan-based Aerogelsmentioning

confidence: 99%

Porous Aerogels and Adsorption of Pollutants from Water and Air: A Review

2021

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Aerogels are open, three-dimensional, porous materials characterized by outstanding properties, such as low density, high porosity, and high surface area. They have been used in various fields as adsorbents, catalysts, materials for thermal insulation, or matrices for drug delivery. Aerogels have been successfully used for environmental applications to eliminate toxic and harmful substances—such as metal ions or organic dyes—contained in wastewater, and pollutants—including aromatic or oxygenated volatile organic compounds (VOCs)—contained in the air. This updated review on the use of different aerogels—for instance, graphene oxide-, cellulose-, chitosan-, and silica-based aerogels—provides information on their various applications in removing pollutants, the results obtained, and potential future developments.

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“…CS hydrogels can be also prepared by increasing pH of the acidic polymer solutions. In this way, a sol-gel transition is promoted, due to hydrophobic interactions ( Moura et al, 2007 ; Tabernero et al, 2020 ). Pereira et al (2020) synthesized CS microspheres loaded with silver (Ag) nanoparticles, through pH inversion mechanism, to be used as bactericidal agent.…”

Section: Chitosan-based Gelsmentioning

confidence: 99%

Agarose, Alginate and Chitosan Nanostructured Aerogels for Pharmaceutical Applications: A Short Review

Guastaferro

Reverchon

Baldino

2021

Front. Bioeng. Biotechnol.

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In this short review, drug delivery systems, formed by polysaccharide-based (i.e., agarose, alginate, and chitosan) aerogels, are analyzed. In particular, the main papers, published in the period 2011–2020 in this research field, have been investigated and critically discussed, in order to highlight strengths and weaknesses of the traditional production techniques (e.g., freeze-drying and air evaporation) of bio-aerogels with respect to supercritical CO2 assisted drying. Supercritical CO2 assisted drying demonstrated to be a promising technique to produce nanostructured bio-aerogels that maintain the starting gel volume and shape, when the solvent removal occurs at negligible surface tension. This characteristic, coupled with the possibility of removing also cross-linking agent residues from the aerogels, makes these advanced devices safe and suitable as carriers for controlled drug delivery applications.

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Role of rheological properties on physical chitosan aerogels obtained by supercritical drying

Cited by 32 publications

References 32 publications

Steady and Oscillatory Shear Flow Behavior of Different Polysaccharides with Laponite®

Steady and Oscillatory Shear Flow Behavior of Different Polysaccharides with Laponite®

Porous Aerogels and Adsorption of Pollutants from Water and Air: A Review

Agarose, Alginate and Chitosan Nanostructured Aerogels for Pharmaceutical Applications: A Short Review

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