Mechanical and thermal properties of nanofibrillated cellulose reinforced silica aerogel composites

Wong, J.; Kaymak, Hicret; Tingaut, Philippe; Brunner, Samuel; Koebel, Matthias M.

doi:10.1016/j.micromeso.2015.06.025

Cited by 101 publications

(48 citation statements)

References 37 publications

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“…An aerogel is a polymer network that is expanded throughout its whole volume by a gas and it is formed by the removal of swelling agents from a gel without substantial volume reduction or network compaction (Leventis, Sadekar, Chandrasekaran, & Sotiriou-Leventis, 2010). These materials are conventionally prepared from inorganic compounds such as silica (Demilecamps, Beauger, Hildenbrand, Rigacci, & Budtova, 2015;Feng, Le, Nguyen, Nien, Jewell, & Duong, 2016;Wong, Kaymak, Tingaut, Brunner, & Koebel, 2015); however, current trends are pushing towards the utilization of more sustainable bio-based and renewable materials. For instance, polysaccharides are suitable materials for the development of bio-based aerogels (Zhai, Zheng, Cai, Xia, & Gong, 2016;Nissila, Karhula, Saarakkala, & Oksman, 2018;Jiménez-Saelices, Seantier, Cathala, & Grohen, 2017;Wang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Development of food packaging bioactive aerogels through the valorization of Gelidium sesquipedale seaweed

et al. 2019

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This study presents the valorization of the Gelidium sesquipedale seaweed for the development of bioactive aerogels with interest in food packaging applications. The raw seaweed was used to extract cellulose, highly crystalline (Xc∼70%) and high aspect ratio (∼40) nanocellulose and an agarbased extract, rich in polyphenols and with antioxidant capacity. Subsequently, pure PVA and hybrid aerogels containing cellulose and nanocellulose were produced by a physical cross-linking method. The presence of hydroxyl groups provided by the high aspect ratio of nanocellulose promoted the interactions with water and facilitated the accessibility of moisture towards the interior of the aerogels, hence generating high water sorption capacity materials. The agar-based extract was then incorporated into selected formulations and the release in hydrophobic and hydrophilic food simulant media was investigated. Pure PVA aerogels dissolved in aqueous media, resulting in an immediate release of the bioactive. Interestingly, the hybrid aerogels containing cellulose and nanocellulose preserved their integrity and provided a more gradual release. Although the hybrid aerogels presented similar release profiles during the first 48 h, the presence of nanocellulose led to greater release values after more prolonged times. This shows the promising properties of hybrid PVA/cellulose/nanocellulose aerogels as matrices for the controlled release of bioactive compounds in food systems, which could be of interest for the development of bioactive packaging structures.

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Section: Introductionmentioning

confidence: 99%

Development of food packaging bioactive aerogels through the valorization of Gelidium sesquipedale seaweed

et al. 2019

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“…Wong et al [57] prepared a cellulose/silica aerogel by dispersing cellulose nanofibrils on a poly(ethoxydisiloxane) sols prior to gelation. No significant enhancements in elastic modulus, compressive strength, or fracture strain could be identified or separated from the effects of increasing density.…”

Section: Cellulose/silica Aerogels For Thermal Insulationmentioning

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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“…In contrast to the two-step gelation−impregnation process, a one-step homogeneous dispersion and simultaneous gelation of nanocellulose and silica precursor are more attractive. However, current practice mostly employs organic silica precursors, such as TEOS 37,38 and methyltrimethoxysilane, 39 which requires redispersing nanocellulose into a common DMSO 39 or alcohol solvent 37,38 and therefore is more expensive and environmentally unfavorable. 40 Toward a more streamlined integration and green process, a facile one-step sol−gel process involving all aqueous dispersible precursors was developed to fabricate cellulose nanofibrils (CNFs)−silica aerogel.…”

Section: ■ Introductionmentioning

confidence: 99%

Aqueous Synthesis of Compressible and Thermally Stable Cellulose Nanofibril–Silica Aerogel for CO₂ Adsorption

Jiang

Hsieh

2018

ACS Appl. Nano Mater.

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Cellulose nanofibrils (CNF)−silica aerogels have been facilely synthesized via a one-step in situ aqueous sol−gel process of polymerizing and aging the silica precursor in the presence of CNFs to encompass the superior dry compressive strength and flexibility of CNF aerogels and the thermal stability of silica aerogels. Sodium silicate (Na 2 SiO 3) was hydrolyzed and polymerized in the presence of CNFs at varied ratios to synthesize hydrogels whose storage and loss modulus confirmed CNFs to function as the structural skeleton. At the optimal 8:2 CNFs/Na 2 SiO 3 composition, the hydrogels with homogeneously dispersed silica and CNF can be freeze-dried into hierarchically mesoporous aerogels with ultralow density of 7.7 mg/cm 3 , high specific surface of 342 m 2 /g, and pore volume of 0.86 cm 3 /g. This robust sol−gel approach employs naturally abundant silica and cellulose in aqueous system to generate improved CNF−silica aerogels that had much higher compressive strength and modulus of up to 28.5 and 177 kPa and structural flexibility than silica aerogel and enhanced thermal stability and specific surface over CNF aerogel. Further functionalization of CNF−silica aerogels via organosilane reaction introduced primary amine groups capable of capturing CO 2 with an adsorption capacity of 1.49 mmol/g.

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Mechanical and thermal properties of nanofibrillated cellulose reinforced silica aerogel composites

Cited by 101 publications

References 37 publications

Development of food packaging bioactive aerogels through the valorization of Gelidium sesquipedale seaweed

Development of food packaging bioactive aerogels through the valorization of Gelidium sesquipedale seaweed

Cellulose Aerogels for Thermal Insulation in Buildings: Trends and Challenges

Aqueous Synthesis of Compressible and Thermally Stable Cellulose Nanofibril–Silica Aerogel for CO₂ Adsorption

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Mechanical and thermal properties of nanofibrillated cellulose reinforced silica aerogel composites

Cited by 101 publications

References 37 publications

Development of food packaging bioactive aerogels through the valorization of Gelidium sesquipedale seaweed

Development of food packaging bioactive aerogels through the valorization of Gelidium sesquipedale seaweed

Cellulose Aerogels for Thermal Insulation in Buildings: Trends and Challenges

Aqueous Synthesis of Compressible and Thermally Stable Cellulose Nanofibril–Silica Aerogel for CO2 Adsorption

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Aqueous Synthesis of Compressible and Thermally Stable Cellulose Nanofibril–Silica Aerogel for CO₂ Adsorption