Formation of supramolecular structure in alginate/chitosan aerogel materials during sol-gel synthesis

Gorshkova, Natalia; Бровко, О. С.; Паламарчук, И. А.; Боголицын, К. Г.; Богданович, Н. И.; Ивахнов, А. Д.; Чухчин, Д. Г.; Arkhilin, Mikhail

doi:10.1007/s10971-020-05309-9

Cited by 16 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of polar ionic groups and hydrophobic regions in ALG and CHT macromolecules facilitates their combination in solution without significant energy consumption due to the formation of intermolecular ionic, hydrogen bonds, and hydrophobic interactions. Ionic bonds are formed mainly between the carboxyl groups of ALG and amino groups of CHT and have a cooperative character, 30‐32 which leads to the formation of the interpolyelectrolyte complex (IPEC) with macroblock structure. ALG enters into a polyelectrolyte reaction with CHT, according to Equation (2):

{(R — {COO}^{-} {Na}^{+})}_{n} + {(^{-} {OOCH}_{3} С^{+} {NH}_{3} — {normalR}_{1})}_{m} ⇆ ⇆ ([], {(R — {COO}^{-} \dots^{+} {NH}_{3} — {normalR}_{1})}_{x} \cdot {(R — {COO}^{-} {Na}^{+})}_{n - х} \cdot {(^{-} {OOCH}_{3} С^{+} {NH}_{3} — {normalR}_{1})}_{m - x}) + x {Na}^{+} + x {CH}_{3} COO

…”

Section: Results and Their Discussionmentioning

confidence: 99%

Preparation of bioactive aerogel material based on sodium alginate and chitosan for controlled release of levomycetin

Gorshkova

Бровко

Паламарчук

et al. 2021

Polymers for Advanced Techs

Self Cite

View full text Add to dashboard Cite

This work was aimed at obtaining new highly porous two‐component alginate‐chitosan aerogels for use as a controlled‐release drug delivery system. Aerogel materials were prepared on the basis of the sodium alginate–chitosan interpolymer complex using sol–gel and supercritical fluid technologies. The effect of the ratio of sodium alginate and chitosan on the textural characteristics of aerogels and their water uptake capacity was studied. The obtained materials are characterized by a developed mesoporous structure and a specific surface area of up to 260 m2g−1. It was established that 1 g of alginate‐chitosan aerogel retains up to 35 g of water. The polyelectrolyte nature of the aerogel material, shape stability, high specific surface area, developed mesoporous structure, open cylindrical pore shape, and high water absorption make the alginate/chitosan aerogel material attractive for the purposes of sorption and application therapy. The aerogels can be used as drug delivery system demonstrating prolonged levomycetin release kinetics. The content of released levomycetin from the aerogel matrix within 4 h was up to 95%.

show abstract

{(R — {COO}^{-} {Na}^{+})}_{n} + {(^{-} {OOCH}_{3} С^{+} {NH}_{3} — {normalR}_{1})}_{m} ⇆ ⇆ ([], {(R — {COO}^{-} \dots^{+} {NH}_{3} — {normalR}_{1})}_{x} \cdot {(R — {COO}^{-} {Na}^{+})}_{n - х} \cdot {(^{-} {OOCH}_{3} С^{+} {NH}_{3} — {normalR}_{1})}_{m - x}) + x {Na}^{+} + x {CH}_{3} COO

…”

Section: Results and Their Discussionmentioning

confidence: 99%

Preparation of bioactive aerogel material based on sodium alginate and chitosan for controlled release of levomycetin

Gorshkova

Бровко

Паламарчук

et al. 2021

Polymers for Advanced Techs

Self Cite

View full text Add to dashboard Cite

show abstract

“…The use of alginate aerogels as precursors for carbon aerogel has been another approach to target specific properties and structure. An alginate/chitosan aerogel showed a specific surface area of 399 m 2 /g after ionic crosslinking and supercritical drying, and this was further increased to 549 m 2 /g after carbonization [237]. Carbon aerogels from freeze-dried alginate displayed a specific surface area between 157 to 230 m 2 /g, depending on the ionic gelation conditions and carbonization temperature [238,239], and Cu-doped aerogels further displayed excellent electrochemical performance (414.4 F g −1 ; scan rate: 0.3 mV s −1 ).…”

Section: Aerogels From Alginatementioning

confidence: 99%

Biorefinery Approach for Aerogels

et al. 2020

View full text Add to dashboard Cite

According to the International Energy Agency, biorefinery is “the sustainable processing of biomass into a spectrum of marketable bio-based products (chemicals, materials) and bioenergy (fuels, power, heat)”. In this review, we survey how the biorefinery approach can be applied to highly porous and nanostructured materials, namely aerogels. Historically, aerogels were first developed using inorganic matter. Subsequently, synthetic polymers were also employed. At the beginning of the 21st century, new aerogels were created based on biomass. Which sources of biomass can be used to make aerogels and how? This review answers these questions, paying special attention to bio-aerogels’ environmental and biomedical applications. The article is a result of fruitful exchanges in the frame of the European project COST Action “CA 18125 AERoGELS: Advanced Engineering and Research of aeroGels for Environment and Life Sciences”.

show abstract

“…Because of these reasons, significant efforts have been made to thoroughly characterize the nanostructured interior of these sensitive materials. Imaging the morphology by scanning electron microscopy (SEM), and assessment of pore characteristics by nitrogen adsorption-desorption porosimetry are key analytical procedures [ 34 , 35 , 36 ]. These techniques, however, require extensive care to ensure that the results are representative for the true interior of the materials, and exclude any possible artifacts.…”

Section: Introductionmentioning

confidence: 99%

False Morphology of Aerogels Caused by Gold Coating for SEM Imaging

et al. 2021

View full text Add to dashboard Cite

The imaging of non-conducting materials by scanning electron microscopy (SEM) is most often performed after depositing few nanometers thick conductive layers on the samples. It is shown in this work, that even a 5 nm thick sputtered gold layer can dramatically alter the morphology and the surface structure of many different types of aerogels. Silica, polyimide, polyamide, calcium-alginate and cellulose aerogels were imaged in their pristine forms and after gold sputtering utilizing low voltage scanning electron microscopy (LVSEM) in order to reduce charging effects. The morphological features seen in the SEM images of the pristine samples are in excellent agreement with the structural parameters of the aerogels measured by nitrogen adsorption-desorption porosimetry. In contrast, the morphologies of the sputter coated samples are significantly distorted and feature nanostructured gold. These findings point out that extra care should be taken in order to ensure that gold sputtering does not cause morphological artifacts. Otherwise, the application of low voltage scanning electron microscopy even yields high resolution images of pristine non-conducting aerogels.

show abstract

Formation of supramolecular structure in alginate/chitosan aerogel materials during sol-gel synthesis

Cited by 16 publications

References 35 publications

Preparation of bioactive aerogel material based on sodium alginate and chitosan for controlled release of levomycetin

Preparation of bioactive aerogel material based on sodium alginate and chitosan for controlled release of levomycetin

Biorefinery Approach for Aerogels

False Morphology of Aerogels Caused by Gold Coating for SEM Imaging

Contact Info

Product

Resources

About