Kinetics of chitosan coagulation from aqueous solutions

Enache, Alin; David, Laurent; Puaux, Jean Pierre; Banu, Ionuț; Bozga, Grigore

doi:10.1002/app.46062

Cited by 18 publications

(4 citation statements)

References 38 publications

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“…The membrane in chitosan hydrogels was found to result from rapid aggregation of polymer chains. [19] As will be shown later, in agreement with previous studies of the neutralization kinetics, [46] the rate of gelation in the superficial membrane is at least ≈ 3 times faster than the regions where the capillaries form. Increasing the NaOH and chitosan concentrations enhanced the fast aggregation close to the base solution source, causing the thickness of the membrane to increase, as shown in Figure 2A.…”

Section: Resultssupporting

confidence: 90%

Chitosan hydrogel micro-bio-devices with complex capillary patterns via reactive-diffusive self-assembly

et al. 2019

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We present chitosan hydrogel microfluidic devices with self-assembled complex microcapillary patterns, conveniently formed by a diffusion-reaction process. These patterns in chitosan hydrogels are formed by a single-step procedure involving diffusion of a gelation agent into the polymer solution inside a microfluidic channel. By changing the channel geometry, it is demonstrated how to control capillary length, trajectory and branching. Diffusion of nanoparticles (NPs) in the capillary network is used as a model to effectively mimic the transport of nano-objects in vascularized tissues. Gold NPs diffusion is measured locally in the hydrogel chips, and during their two-step transport through the capillaries to the gel matrix and eventually to embedded cell clusters in the gel. In addition, the quantitative analyses reported in this study provide novel opportunities for theoretical investigation of capillary formation and propagation during diffusive gelation of biopolymers.

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Section: Resultssupporting

confidence: 90%

Chitosan hydrogel micro-bio-devices with complex capillary patterns via reactive-diffusive self-assembly

et al. 2019

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“…As a result of this contraction, the internal defect structure produced by the diffusion process could be reduced. However, the rapidly formed cortex structure prevented the fiber from contracting evenly . Therefore, for the above two reasons, a variety of defect structures were generated on fiber surfaces and sections, which became more severe with the increase in the coefficient value D.…”

Section: Resultsmentioning

confidence: 99%

Influences of diffusion coefficient of 1‐allyl‐3‐methylimidazolium chloride on structure and properties of regenerated cellulose fiber obtained via dry‐jet‐wet spinning

Stankovic

Wang

Shi

2019

J of Applied Polymer Sci

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The diffusion dynamics of the cellulose/1-allyl-3-methylimidazolium chloride ([Amim]Cl) solution during coagulation of regenerated cellulose fiber in a nonsolvent bath was investigated in detail. According to Fick's second law of diffusion, the experimental data were fitted to obtain the diffusion coefficients of [Amim]Cl (D). The cellulose concentration, bath type, and temperature were varied to analyze their influence on the diffusion coefficient of [Amim]Cl. Furthermore, the dependence of the structure and properties of the regenerated fiber obtained via dry-jet-wet spinning on the diffusion coefficients were analyzed. Many defects were formed in the surface and cross sections of the regenerated fibers prepared with high diffusion coefficients. The crystallization and mechanical properties deteriorated with the increase in the diffusion rate of [Amim]Cl. Therefore, the diffusion coefficients of [Amim]Cl should be kept relatively low to enable the preparation of uniform-structured regenerated cellulose fibers.

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“…In this study, we used low-molecular-weight chitosan for the preparation of the membranes due to its enhanced antimicrobial activity. Thus, the chitosan hydrogels were obtained as previously reported [82] by inducing the gelation of the chitosan solution with aqueous NaOH. Firstly, two chitosan solutions (3%, 4%wt.)…”

Section: Preparation Of Chitosan Membranesmentioning

confidence: 99%

Chitosan Membranes Containing Plant Extracts: Preparation, Characterization and Antimicrobial Properties

Grădinaru¹,

Barbălată-Mândru²,

Enache

et al. 2023

IJMS

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The main strategy of this study was to combine the traditional perspective of using medicinal extracts with polymeric scaffolds manufactured by an engineering approach to fabricate a potential dressing product with antimicrobial properties. Thus, chitosan-based membranes containing S. officinalis and H. perforatum extracts were developed and their suitability as novel dressing materials was investigated. The morphology of the chitosan-based films was assessed by scanning electron microscopy (SEM) and the chemical structure characterization was performed via Fourier transform infrared spectroscopy (FTIR). The addition of the plant extracts increased the sorption capacity of the studied fluids, mainly at the membrane with S. officinalis extract. The membranes with 4% chitosan embedded with both plant extracts maintained their integrity after being immersed for 14 days in incubation media, especially in PBS. The antibacterial activities were determined by the modified Kirby–Bauer disk diffusion method for Gram-positive (S. aureus ATCC 25923, MRSA ATCC 43300) and Gram-negative (E. coli ATCC 25922, P. aeruginosa ATCC 27853) microorganisms. The antibacterial property was enhanced by incorporating the plant extracts into chitosan films. The outcome of the study reveals that the obtained chitosan-based membranes are promising candidates to be used as a wound dressing due to their good physico-chemical and antimicrobial properties.

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Kinetics of chitosan coagulation from aqueous solutions

Cited by 18 publications

References 38 publications

Chitosan hydrogel micro-bio-devices with complex capillary patterns via reactive-diffusive self-assembly

Chitosan hydrogel micro-bio-devices with complex capillary patterns via reactive-diffusive self-assembly

Influences of diffusion coefficient of 1‐allyl‐3‐methylimidazolium chloride on structure and properties of regenerated cellulose fiber obtained via dry‐jet‐wet spinning

Chitosan Membranes Containing Plant Extracts: Preparation, Characterization and Antimicrobial Properties

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