A Spectroscopic Study of Solid-Phase Chitosan/Cyclodextrin-Based Electrospun Fibers

Chen, Xue; Wilson, Lee D.

doi:10.3390/fib7050048

Cited by 10 publications

(9 citation statements)

References 49 publications

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“…The strong absorption band in this region at the wavenumber of 1370 cm −1 comes from chitosan. This is consistent with the reports of other authors [ 37 , 40 , 41 ]. The band with the maximum at 1910 cm −1 (shaded), characteristic for the DMASQ dye, appears in the spectra of doped CS films.…”

Section: Resultssupporting

confidence: 94%

Chitosan as a Protective Matrix for the Squaraine Dye

et al. 2021

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Chitosan was used as a protective matrix for the photosensitive dye-squaraine (2,4-bis[4-(dimethylamino)phenyl]cyclobutane-1,3-diol). The physicochemical properties of the obtained systems, both in solution and in a solid-state, were investigated. However, it was found that diluted chitosan solutions with a few percent additions of dye show an intense fluorescence, which is suppressed in the solid-state. This is related to the morphology of the heterogeneous modified chitosan films. The important advantage of using a biopolymer matrix is the prevention of dye degradation under the influence of high energy ultraviolet (UV) radiation while the dye presence improves the chitosan heat resistance. It is caused by mutual interactions between macromolecules and dye. Owing to the protective action of chitosan, the dye release in liquid medium is limited. Chitosan solutions with a few percent additions of squaraine can be used in biomedical imaging thanks to the ability to emit light, while chitosan films can be protective coatings resistant to high temperatures and UV radiation.

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Section: Resultssupporting

confidence: 94%

Chitosan as a Protective Matrix for the Squaraine Dye

et al. 2021

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“…In order to improve the adsorption efficiency of CMF, it is necessary to determine which physicochemical properties are the most important to achieve this goal, and how the heat treatments in the synthesis influence them. Usually, carbon fibers are synthesized by electrospinning because of its simplicity, low-cost, and industrially scalability [20][21][22][23][24]. The electrospinning process consists of the use of polymer solutions subjected to a high voltage difference to force the generation of polymer fibers [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Improve in CO2 and CH4 Adsorption Capacity on Carbon Microfibers Synthesized by Electrospinning of PAN

Ojeda-López

Esparza-Schulz

Pérez-Hermosillo

et al. 2019

Fibers

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Carbon microfibers (CMF) has been used as an adsorbent material for CO2 and CH4 capture. The gas adsorption capacity depends on the chemical and morphological structure of CMF. The CMF physicochemical properties change according to the applied stabilization and carbonization temperatures. With the aim of studying the effect of stabilization temperature on the structural properties of the carbon microfibers and their CO2 and CH4 adsorption capacity, four different stabilization temperatures (250, 270, 280, and 300 °C) were explored, maintaining a constant carbonization temperature (900 °C). In materials stabilized at 250 and 270 °C, the cyclization was incomplete, in that, the nitrile groups (triple-bond structure, e.g., C≡N) were not converted to a double-bond structure (e.g., C=N), to form a six-membered cyclic pyridine ring, as a consequence the material stabilized at 300 °C resulting in fragile microfibers; therefore, the most appropriate stabilization temperature was 280 °C. Finally, to corroborate that the specific surface area (microporosity) is not the determining factor that influences the adsorption capacity of the materials, carbonization of polyacrylonitrile microfibers (PANMFs) at five different temperatures (600, 700, 800, 900, and 1000 °C) is carried, maintaining a constant temperature of 280 °C for the stabilization process. As a result, the CMF chemical composition directly affects the CO2 and CH4 adsorption capacity, even more directly than the specific surface area. Thus, the chemical variety can be useful to develop carbon microfibers with a high adsorption capacity and selectivity in materials with a low specific surface area. The amount adsorbed at 25 °C and 1.0 bar oscillate between 2.0 and 2.9 mmol/g adsorbent for CO2 and between 0.8 and 2.0 mmol/g adsorbent for CH4, depending on the calcination treatment applicated; these values are comparable with other material adsorbents of greenhouse gases.

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“…This is in contrast to the previous report that high elasticity is a condition for electrospinning solutions without polymer entanglements [68]. A recent study of chitosan/trifluoroacetic acid (TFA)/HP-β-CD system was conducted by Xue and Wilson [90] where several components were found to form a multi-component assembly (cf. Figure 10) attributed to facilitating this system's propensity for electrospinning.…”

Section: Supramolecular Interactions In Cyclodextrin-based Systemsmentioning

confidence: 77%

“…Figure 10) attributed to facilitating this system's propensity for electrospinning. TFA serves as a joint between chitosan and HP-β-CD in this assembly: TFA electrostatically bonds with chitosan (-COO − --NH 3 + ) and forms a host-guest "facial" complex between the trifluoromethyl groups of TFA with HP-β-CD (-CF 3 --HP-β-CD) [90]. The unique supramolecular assembly between the HP-β-CD units with the TFA anion was supported by results from previous studies of host-guest complexes between β-CD and haloalkanes such as halothane by Wilson and Verrall [91], further highlighting the role of supramolecular interactions in such complex multi-component systems.…”

Section: Supramolecular Interactions In Cyclodextrin-based Systemsmentioning

confidence: 99%

An Overview of the Design of Chitosan-Based Fiber Composite Materials

Chen

Wilson

2021

J. Compos. Sci.

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Chitosan composite fibrous materials continue to generate significant interest for wastewater treatment, food packaging, and biomedical applications. This relates to the relatively high surface area and porosity of such fibrous chitosan materials that synergize with their unique physicochemical properties. Various methods are involved in the preparation of chitosan composite fibrous materials, which include the modification of the biopolymer that serve to alter the solubility of chitosan, along with post-treatment of the composite materials to improve the water stability or to achieve tailored functional properties. Two promising methods to produce such composite fibrous materials involve freeze-drying and electrospinning. Future developments of such composite fibrous materials demands an understanding of the various modes of preparation and methods of structural characterization of such materials. This review contributes to an understanding of the structure–property relationships of composite fibrous materials that contain chitosan, along with an overview of recent advancements concerning their preparation.

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A Spectroscopic Study of Solid-Phase Chitosan/Cyclodextrin-Based Electrospun Fibers

Cited by 10 publications

References 49 publications

Chitosan as a Protective Matrix for the Squaraine Dye

Chitosan as a Protective Matrix for the Squaraine Dye

Improve in CO2 and CH4 Adsorption Capacity on Carbon Microfibers Synthesized by Electrospinning of PAN

An Overview of the Design of Chitosan-Based Fiber Composite Materials

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