Cellulose nanofiber aerogel production and applications

Nakagaito, Antonio Norio; Kondo, Hikaru; Takagi, Hitoshi

doi:10.1177/0731684413494110

Cited by 28 publications

(17 citation statements)

References 9 publications

(8 reference statements)

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“…They found that liquid nitrogen induced the rapid formation of ice crystals, which effectively inhibited the self-agglomeration of cellulose and produced a more uniform and smooth surface structure [83]. Anti-freezing agents [168] and spray freeze-drying techniques [84,169] also rely on an accelerated freezing rate to produce aerogels with a uniform structure. However, there are similar freezing rate and local temperature gradients ahead of the moving solid–liquid interface, such as when freeze-drying thin samples in a fridge while also cooling a big sample.…”

Section: Preparation Of Cellulose Aerogelmentioning

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: Preparation Of Cellulose Aerogelmentioning

confidence: 99%

Cellulose Aerogels: Synthesis, Applications, and Prospects

2018

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“…In principle, aerogels are prepared by replacing the solvent in the hydrogel with air without altering the original structure of the material [11,12]. Two methods, namely Shamskar et al (2016) fabricated CNC aerogel via freeze-drying from raw cotton and cotton stalk and obtained aerogels with specific surface area of 91.47 and 93.89 m 2 /g, respectively [28].…”

Section: Introductionmentioning

confidence: 99%

“…In principle, aerogels are prepared by replacing the solvent in the hydrogel with air without altering the original structure of the material [ 11 , 12 ]. Two methods, namely supercritical drying and freeze-drying, are mostly used for the fabrication of aerogel.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled Behavior of Ultralightweight Aerogel from a Mixture of CNC/CNF from Oil Palm Empty Fruit Bunches

et al. 2021

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This study aims to explore the use of cellulose nanocrystals (CNC) and cellulose nanofiber (CNF), obtained from unbleached fiber of oil palm empty fruit bunches (EFB), as raw materials in fabricating aerogel, using the facile technique without solvent displacement. The CNC was isolated from sulfuric acid hydrolysis, and the CNF was fibrillated using Ultra Turrax. The CNC and CNF were mixed by ultrasonication in different ratios to produce aerogel using slow freezing (−20 °C), followed by freeze-drying. The obtained aerogel was characterized as ultralightweight and highly porous material, at the density range of 0.0227 to 0.0364 g/cm3 and porosity of 98.027 to 98.667%. Interestingly, the ratio of CNC and CNF significantly affected the characteristics of the obtained aerogel. The mixed aerogel exhibited a higher specific surface area than pure CNC or CNF, with the highest value of 202.72 m2/g for the ratio of 1:3 (CNC/CNF). In addition, the crystallinity degree of obtained aerogel showed a higher value in the range of 76.49 to 69.02%, with the highest value being obtained for higher CNC content. This study is expected to provide insight into nanocellulose-based aerogel, with a promising potential for various applications.

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“…12 There have been many elastomers proven to be effective for PP-LDPE blends, for example, styrene-butadiene-styrene, 13 ethylene-propylene-diene rubber, 14 ethylene-propylene-ethylidene norborene copolymer (EPCAR-847), 15 PE-g-poly(2-methyl-1,3-butadiene), 9 and so on. In addition, one can introduce micro or nanoparticles-such as talc, 16 carbon nanotube, 17 nanoclay, 18 nano-silicon dioxide (nanoSiO 2 ), 19 nanoTiO 2 , 20 SiO 2 / TiO 2 , 21 and cellulose nanofibers 22 -into the blended material to enhance the mechanical properties of a component fabricated by polymer or polymer blends. However, it was often reported that tensile strength, elastic modulus, and stress at break of the blends with a compatibilizer or nanofiller decreased while impact strength and elongation increased and vice versa.…”

Section: Introductionmentioning

confidence: 99%

Influence of mechanical properties of polypropylene/low-density polyethylene nanocomposites

Zhou

2017

Nanomaterials and Nanotechnology

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The mechanical blending of polypropylene and low-density polyethylene is an economical and simple method for producing new polymeric materials for specific applications. However, the reduction in mechanical properties of the blend is one of its main shortcomings. In this study, a filler masterbatch including nano-silicon dioxide, compatibilizer, lubricant agent, and antioxidant agent was prepared, and polypropylene-low-density polyethylene composite parts with different content of filler masterbatch were fabricated and tested for mechanical properties at two tensile test speeds. Also, to investigate the underlying mechanism of the mechanical properties improvement, the tested samples were carefully analyzed and compared and further characterized by scanning electron microscopy and differential scanning calorimetry. The results indicate that the mechanical properties, including tensile strength, moduli, and elongation, can be all drastically improved simultaneously with the addition of the filler masterbatch. The results also suggest that the compatibility of the two phases increases with the increase in the filler masterbatch, and the crystal size decreases and distribution uniforms owing to the addition of the filler masterbatch. Furthermore, it was also found that there is a close relationship between the mechanical properties and morphological structures, which are improved by the existence of the filler masterbatch.

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Cellulose nanofiber aerogel production and applications

Cited by 28 publications

References 9 publications

Cellulose Aerogels: Synthesis, Applications, and Prospects

Cellulose Aerogels: Synthesis, Applications, and Prospects

Self-Assembled Behavior of Ultralightweight Aerogel from a Mixture of CNC/CNF from Oil Palm Empty Fruit Bunches

Influence of mechanical properties of polypropylene/low-density polyethylene nanocomposites

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