Biomimetic structural cellulose nanofiber aerogels with exceptional mechanical, flame-retardant and thermal-insulating properties

Wang, Dong; Peng, Hongxia; Yu, Bin; Zhou, Keqing; Pan, Haifeng; Zhang, Liping; Li, Min; Tian, Anli; Fu, Shaohai

doi:10.1016/j.cej.2020.124449

Cited by 178 publications

(73 citation statements)

References 50 publications

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“…Under compression, the bonding points inhibit the slipping of the nanofibers.B esides,t he nanofibers between two lamellae act as the bridging sites to favor the load transfer throughout the whole aerogel. [16] More importantly,the small grain size (17.9 nm, calculated by the Scherrer equation) can increase the grain boundaries in the TiO 2 nanofibers,t hus improving the ability to dissipate the external stress,a nd ensuring the structural stability during compression. [17] Benefiting from this structural stability,aplastic deformation of only 4.8 %occurs after 100 compression-recovery cycles at an e of 25 %w ith al oading rate of 300 mm min À1 (Figure 2c).…”

Section: Resultsmentioning

confidence: 99%

Conductive and Elastic TiO₂ Nanofibrous Aerogels: A New Concept toward Self‐Supported Electrocatalysts with Superior Activity and Durability

et al. 2020

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Recently,v arious titanium dioxide (TiO 2)n anostructures have received increasing attention in the fields of energy conversion and storage owingt ot heir electrochemical properties.H owever,t hese particulate nanomaterials exclusively exist in the powder form, which may cause health risks and environmental hazards.H erein we report an ovel, highly elastic bulk form of TiO 2 for safe use and easy recycling. Specifically,T iO 2 nanofibrous aerogels (NAs) consisting of resiliently bonded, flexible TiO 2 nanofibers are constructed, which have an ultralowb ulk density,u ltrahigh porosity,a nd excellent elasticity.T op romote charge transfer,t hey are subjected to lithium reduction to generate abundant oxygen vacancies,whichcan modulate the electronic structure of TiO 2 , resulting in ac onductivity up to 38.2 mS cm À1 .A saproof-ofconcept demonstration, the conductive and elastic TiO 2 NAs serve as an ew type of self-supported electrocatalyst for ambient nitrogen fixation, achieving an ammonia yield of 4.19 10 À10 mol s À1 cm À2 and aF aradaic efficiency of 20.3 %. The origin of the electrocatalytic activity is revealed by DFT calculations.

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Section: Resultsmentioning

confidence: 99%

Conductive and Elastic TiO₂ Nanofibrous Aerogels: A New Concept toward Self‐Supported Electrocatalysts with Superior Activity and Durability

et al. 2020

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“…The thermal conduction is related to the structure and density of PU foam, while the radiation is affected by the cell size of the PU foam [18]. Generally, for the heat transfer evaluation on the PU foams, the convection and radiation heat transfer can be neglected [8].…”

Section: Resultsmentioning

confidence: 99%

“…The thermal insulations derived from biomass such as agricultural straws are attracting the interest of the public, due to the hollow structure, low cost, low density as well as low thermal conductivity. The thermal radiation and conduction are the important heat transfer modes for thermal insulation [4][5][6], and the thermal conductivity coefficient is more often used to describe the property of insulation materials [7][8][9][10]. Research on the production of bio-insulations started in 1974 [11].…”

Section: Introductionmentioning

confidence: 99%

Renewable natural resources reinforced polyurethane foam for use of lightweight thermal insulation

Shao

Zhang

Han

et al. 2020

Mater. Res. Express

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To obtain the energy-saving and environment-friendly lightweight bio-based thermal insulation, polyurethane matrix was incorporated with wood fiber, bamboo fiber, rice husk and liquefied polyol at different percentages (25%, 30%, and 35%). The results revealed that the apparent density for the natural fibers reinforced thermal polyurethane insulation was between 105 kg.m −3 and 178 kg.m −3 by adding 35% of the fibers into the polyurethane matrix. The thermal conductivity of the bio-based thermal insulation ranged from 0.045 to 0.065 W.m −1 K −1 , the addition of the natural fibers increased mechanical strength. The prepared bio-based insulation showed great potential for building thermal insulations with particularly low thermal conductivity (less than 0.065 W.m −1 K −1 ) and self-bearing strength.

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“…Subsequently, several studies have investigated advanced thermal insulating materials based on CCS foams aligned along a single direction. [16][17][18][19][20][21] However, these approaches have encountered several limitations in further improving the thermally insulating properties. First, the lack of capability of controlling the cell dimension and internal wall thickness results in an inevitable increase of solid conduction.…”

Section: Introductionmentioning

confidence: 99%

Graphene‐Based Ultralight Compartmentalized Isotropic Foams with an Extremely Low Thermal Conductivity of 5.75 mW m⁻¹ K⁻¹

Lee

Yoo

2020

Adv Funct Materials

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The importance of high-performance thermal insulation materials is rapidly emerging due to energy conservation and the management of temperaturesensitive device perspectives. Recent thermal insulation materials including complex structures have been developed either by reducing the structural connectivity to mitigate thermal transport through solid conduction or forming directionally aligned confined inner pores to suppress the internal gas convection. In this study, to create a highly efficient thermal insulating material that suppresses thermal transport in all directions, graphene-based anisotropic closed-cellular structures (CCS) are devised with a highly ordered assembly of hollow compartments with extremely thin walls (≈50 nm). This uniquely designed CCS made from microfluidically synthesized graphene solid bubbles exhibited a remarkably low thermal conductivity of 5.75 mW m −1 K −1 thanks to effective suppression of both solid conduction and gas conduction/convection. Therefore, the proposed strategy in this work offers a novel toolkit for implementing next-generation high-performance insulation materials.

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Biomimetic structural cellulose nanofiber aerogels with exceptional mechanical, flame-retardant and thermal-insulating properties

Cited by 178 publications

References 50 publications

Conductive and Elastic TiO₂ Nanofibrous Aerogels: A New Concept toward Self‐Supported Electrocatalysts with Superior Activity and Durability

Conductive and Elastic TiO₂ Nanofibrous Aerogels: A New Concept toward Self‐Supported Electrocatalysts with Superior Activity and Durability

Renewable natural resources reinforced polyurethane foam for use of lightweight thermal insulation

Graphene‐Based Ultralight Compartmentalized Isotropic Foams with an Extremely Low Thermal Conductivity of 5.75 mW m⁻¹ K⁻¹

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Biomimetic structural cellulose nanofiber aerogels with exceptional mechanical, flame-retardant and thermal-insulating properties

Cited by 178 publications

References 50 publications

Conductive and Elastic TiO2 Nanofibrous Aerogels: A New Concept toward Self‐Supported Electrocatalysts with Superior Activity and Durability

Conductive and Elastic TiO2 Nanofibrous Aerogels: A New Concept toward Self‐Supported Electrocatalysts with Superior Activity and Durability

Renewable natural resources reinforced polyurethane foam for use of lightweight thermal insulation

Graphene‐Based Ultralight Compartmentalized Isotropic Foams with an Extremely Low Thermal Conductivity of 5.75 mW m−1 K−1

Contact Info

Product

Resources

About

Conductive and Elastic TiO₂ Nanofibrous Aerogels: A New Concept toward Self‐Supported Electrocatalysts with Superior Activity and Durability

Conductive and Elastic TiO₂ Nanofibrous Aerogels: A New Concept toward Self‐Supported Electrocatalysts with Superior Activity and Durability

Graphene‐Based Ultralight Compartmentalized Isotropic Foams with an Extremely Low Thermal Conductivity of 5.75 mW m⁻¹ K⁻¹