Flow‐driven Surface Instabilities of Tubular Chitosan Hydrogel

Kumar, Pawan; Hajdu, Cintia; Tóth, Ágota; Horváth, Dezsö

doi:10.1002/cphc.202000952

Cited by 13 publications

(16 citation statements)

References 40 publications

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“…Patterns on the soft surface are monitored for a fixed alkaline concentration and injection rate when the ionic environment of the injecting CS sol is varied. An injection rate of Q = 1.01 mL min –1 was selected as a reference case because for the given alkaline concentration, coexisting modes of folds and wrinkles evolve on the pure CS tube, as shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Self-Assembly of Metal-Ion-Modulated Chitosan Tubules

et al. 2021

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Soft materials such as gels or biological tissues can develop via selfassembly under chemo-mechanical forces. Here, we report the instantaneous formation of soft tubular structures with a two-level hierarchy by injecting a mixture of inorganic salt and chitosan (CS) solution from below into a reactor filled with alkaline solution. Folding and wrinkling instabilities occur on the originally smooth surface controlled by the salt composition and concentration. Liesegang-like precipitation patterns develop on the outer surface on a μm length scale in the presence of calcium chloride, while the precipitate particles are distributed evenly in the bulk as corroborated by X-ray μ-CT. On the other hand, barium hydroxide precipitates out only in the thin outer layer of the CS tubule when barium chloride is introduced into the CS solution. Independent of the concentration of the weakly interacting salt, an electric potential gradient across the CS membrane develops, which vanishes when the pH difference between the two sides of the membrane diminishes.

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Section: Resultsmentioning

confidence: 99%

Hierarchical Self-Assembly of Metal-Ion-Modulated Chitosan Tubules

et al. 2021

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“…This result indicates that the two bioactive compounds were effectively entrapped within the polymeric matrix with no effect on these physical proprieties of the produced microparticles. A liquid driven sol-gel transition by diffusion transport mechanism across the interface with selforganised surface deformation of chitosan hydrogels with wrinkle surface has been reported [41]. Here it is suggested that a rapid diffusion and evaporation of ethanol alongside water may have triggered a localized self-association of chitosan at the surface of the droplet since chitosan is insoluble in ethanol.…”

Section: Morphology and Size Of Microparticlesmentioning

confidence: 76%

Co-encapsulation of vitamin D and rutin in chitosan-zein microparticles

et al. 2022

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There is a growing interest in co-encapsulating multiple species to harness potential synergy between them, enhance their stability and efficacy in various products. The aim of this work was to co-encapsulate vitamin D3 and rutin inside chitosan-zein microparticles using a simple and easily scalable process for food fortification. This was achieved via anti-solvent precipitation coupled with spray-drying. Free-flowing powders of spherical microparticles with wrinkled surface and particle size < 10 μm were obtained. The encapsulation efficiency was 75% for vitamin D3 and 44% for rutin and this could be attributed to their different molecular size and affinity to the aqueous phase. The physicochemical properties were characterized by X-Ray powder diffraction and Fourier transform infrared spectroscopy. The two crystalline bioactive compounds were present in the microparticles in amorphous form, which would allow for better bioavailability when compared to non-encapsulated crystalline solid. Therefore, the obtained microparticles would be suitable for use as food ingredient for vitamin D3 fortification, with the co-encapsulated rutin acting as stability and activity enhancer.

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“…These diagrams describe the response of the system (compression, tension, maximum curvature) as a function of a control parameter, for example, the imposed pressure difference. We use the results to identify a transition from unwrinkled to periodic wrinkled states and then to folded states similar to what is observed in spring-loaded linings or tubular chitosan hydrogel surfaces [7,25]. Fold states arise via secondary bifurcations from the wrinkled state as in the one-dimensional case.…”

Section: Introductionmentioning

confidence: 84%

Pressure-driven wrinkling of soft inner-lined tubes

Foster¹,

Verschueren²,

Knobloch³

et al. 2022

New J. Phys.

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A simple equation modelling an inextensible elastic lining of an inner-lined tube subject to an imposed pressure difference is derived from a consideration of the idealised elastic properties of the lining and the pressure and soft-substrate forces. Two cases are considered in detail, one with prominent wrinkling and a second one in which wrinkling is absent and only buckling remains. Bifurcation diagrams are computed via numerical continuation for both cases. Wrinkling, buckling, folding, and mixed-mode solutions are found and organised according to system-response measures including tension, in-plane compression, maximum curvature and energy. Approximate wrinkle solutions are constructed using weakly nonlinear theory, in excellent agreement with numerics. Our approach explains how the wavelength of the wrinkles is selected as a function of the parameters in compressed wrinkling systems and shows how localised folds and mixed-mode states form in secondary bifurcations from wrinkled states. Our model aims to capture the wrinkling response of arterial endothelium to blood pressure changes but applies much more broadly.

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Flow‐driven Surface Instabilities of Tubular Chitosan Hydrogel

Cited by 13 publications

References 40 publications

Hierarchical Self-Assembly of Metal-Ion-Modulated Chitosan Tubules

Hierarchical Self-Assembly of Metal-Ion-Modulated Chitosan Tubules

Co-encapsulation of vitamin D and rutin in chitosan-zein microparticles

Pressure-driven wrinkling of soft inner-lined tubes

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