Super absorbent, light, and highly flame retardant cellulose‐based aerogel crosslinked with citric acid

Kaya, Mehmet

doi:10.1002/app.45315

Cited by 73 publications

(43 citation statements)

References 60 publications

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“…Therefore, cellulose aerogels, with their porous structure, large specific surface area, and light density are highly adsorptive for water, oil, and organic solvents [121,179,180]. The adsorption capacity of cellulose aerogels is one order of magnitude higher than that of natural adsorbents and several times that of commercial PP adsorbents.…”

Section: Applications Of Cellulose-based Aerogelsmentioning

confidence: 99%

Cellulose Aerogels: Synthesis, Applications, and Prospects

2018

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Due to its excellent performance, aerogel is considered to be an especially promising new material. Cellulose is a renewable and biodegradable natural polymer. Aerogel prepared using cellulose has the renewability, biocompatibility, and biodegradability of cellulose, while also having other advantages, such as low density, high porosity, and a large specific surface area. Thus, it can be applied for many purposes in the areas of adsorption and oil/water separation, thermal insulation, and biomedical applications, as well as many other fields. There are three types of cellulose aerogels: natural cellulose aerogels (nanocellulose aerogels and bacterial cellulose aerogels), regenerated cellulose aerogels, and aerogels made from cellulose derivatives. In this paper, more than 200 articles were reviewed to summarize the properties of these three types of cellulose aerogels, as well as the technologies used in their preparation, such as the sol-gel process and gel drying. In addition, the applications of different types of cellulose aerogels were also introduced.

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Section: Applications Of Cellulose-based Aerogelsmentioning

confidence: 99%

Cellulose Aerogels: Synthesis, Applications, and Prospects

2018

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“…The linkages between aldehyde and hydroxyl groups are used to prepare films [25,26] while the linkages between aldehyde and amine groups are used to prepare films or gels and fix biological tissues [27,28,29]. Citric acid, which is environment-friendly, non-toxic, and biodegradable, is used as an excellent crosslinking agent in the food and drug industry [30,31]. Crosslinking goes through a mechanism where two carboxylic acid groups on citric acid form an anhydride through the loss of a water molecule.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Superabsorbent Polymers Based on Starch Aldehydes and Carboxymethyl Cellulose

et al. 2018

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Superabsorbent polymers (SAPs) are crosslinked hydrophilic polymers that are capable of absorbing large amounts of water. Commercial SAPs are mostly produced with acrylic acid that cannot be easily biodegraded. Therefore, in this study, polysaccharide-based SAPs using carboxymethyl cellulose as a major component were prepared. Starch aldehydes and citric acid were selected due to their environment-friendly, non-toxic, and biodegradable properties compared to conventional crosslinking agents. Starch aldehydes were prepared by periodate oxidation, which forms aldehyde groups by taking the places of C–OH groups at C-2 and C-3. Furthermore, starch aldehydes were analyzed through the change in FT-IR spectra, the aldehyde quantitation, and the morphology in FE-SEM images. In the crosslinking of polysaccharide-based SAPs, the acetal bridges from starch aldehydes led to a large amount of water entering the network structure of the SAPs. However, the ester bridges from citric acid interfered with the water penetration. In addition, the swelling behavior of the SAPs was analyzed by the Fickian diffusion model and the Schott’s pseudo second order kinetics model. The relationship between swelling behavior and morphology of the SAPs was analyzed by FE-SEM images. In conclusion, polysaccharide-based SAPs were well prepared and the highest equilibrium swelling ratio was 87.0 g/g.

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“…Kaya [38] prepared a cellulose nanofibril aerogel cross-linked with citric acid. The non-cross-linked aerogel, once ignited, burned 25% of the sample after 34 s. The cross-linked aerogel was more slowly ignited and 25% of the sample burned after 51 s.…”

Section: Flame-retardant Performance and Thermal Stabilitymentioning

confidence: 99%

Cellulose Aerogels for Thermal Insulation in Buildings: Trends and Challenges

et al. 2018

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Cellulose-based aerogels hold the potential to become a cost-effective bio-based solution for thermal insulation in buildings. Low thermal conductivities (<0.025 W·m−1·K−1) are achieved through a decrease in gaseous phase contribution, exploiting the Knudsen effect. However, several challenges need to be overcome: production energy demand and cost, moisture sensitivity, flammability, and thermal stability. Herein, a description and discussion of current trends and challenges in cellulose aerogel research for thermal insulation are presented, gathered from studies reported within the last five years. The text is divided into three main sections: (i) an overview of thermal performance of cellulose aerogels, (ii) an identification of challenges and possible solutions for cellulose aerogel thermal insulation, and (iii) a brief description of cellulose/silica aerogels.

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Super absorbent, light, and highly flame retardant cellulose‐based aerogel crosslinked with citric acid

Cited by 73 publications

References 60 publications

Cellulose Aerogels: Synthesis, Applications, and Prospects

Cellulose Aerogels: Synthesis, Applications, and Prospects

Preparation and Characterization of Superabsorbent Polymers Based on Starch Aldehydes and Carboxymethyl Cellulose

Cellulose Aerogels for Thermal Insulation in Buildings: Trends and Challenges

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