Preparation of ambient-dried multifunctional cellulose aerogel by freeze-linking technique

Hu, Xiaodong; Zhang, Shanshan; Yang, Bo; Hao, Ming; Chen, Zhijun; Liu, Yanbo; Wang, Xiaoxiao; Yao, Jinbo

doi:10.1016/j.cej.2023.147044

Cited by 27 publications

(2 citation statements)

References 52 publications

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“…In particular, controlling their physical properties (e.g., porosity, density, and aperture) with the aid of different drying principles appears to be a convenient approach to efficiently regulate porosity features. Compared to supercritical [22,23] or atmospheric [24,25] drying, the freeze-casting technique [26] is an optimal strategy for producing cellulose aerogels on a large scale. It involves freezing a liquid suspension and subliming the solvent thereafter under ultra-low pressure.…”

Section: Introductionmentioning

confidence: 99%

“…The aforementioned studies successfully designed and regulated the porous structures of cellulose aerogels based on various drying principles, showing excellent performance in aspects of pollutant adsorption [25,29,34,35,39], infrared shielding [39], thermal insulation and management [25,30,36,38,39], and soft-tissue engineering applications [33]. However, only a few studies focused on acoustic absorption behaviors [40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Freeze-Drying Processes on the Acoustic Absorption Performance of Sustainable Cellulose Nanocrystal Aerogels

Ruan,

Xie,

Wan

et al. 2024

Gels

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Cellulose aerogels have great prospects for noise reduction applications due to their sustainable value and superior 3D interconnected porous structures. The drying principle is a crucial factor in the preparation process for developing high-performance aerogels, particularly with respect to achieving high acoustic absorption properties. In this study, multifunctional cellulose nanocrystal (CNC) aerogels were conveniently prepared using two distinct freeze-drying principles: refrigerator conventional freezing (RCF) and liquid nitrogen unidirectional freezing (LnUF). The results indicate that the rapid RCF process resulted in a denser CNC aerogel structure with disordered larger pores, causing a stronger compressive performance (Young’s modulus of 40 kPa). On the contrary, the LnUF process constructed ordered structures of CNC aerogels with a lower bulk density (0.03 g/cm3) and smaller apertures, resulting in better thermal stability, higher diffuse reflection across visible light, and especially increased acoustic absorption performance at low–mid frequencies (600–3000 Hz). Moreover, the dissipation mechanism of sound energy in the fabricated CNC aerogels is predicted by a designed porous media model. This work not only paves the way for optimizing the performance of aerogels through structure control, but also provides a new perspective for developing sustainable and efficient acoustic absorptive materials for a wide range of applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Freeze-Drying Processes on the Acoustic Absorption Performance of Sustainable Cellulose Nanocrystal Aerogels

Ruan,

Xie,

Wan

et al. 2024

Gels

View full text Add to dashboard Cite

show abstract

Human Nervous System Inspired Modified Graphene Nanoplatelets/Cellulose Nanofibers‐Based Wearable Sensors with Superior Thermal Management and Electromagnetic Interference Shielding

Zhu,

Tian,

Liu

et al. 2024

Adv Funct Materials

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Wearable sensing technologies have witnessed rapid development in recent years due to their accessibility, functionality, and affordability. However, heat accumulation and electromagnetic interference in electronic components adversely affect the sensing performance and seriously damage human health. Herein, cellulose nanofibers (CNFs)‐based composites with high thermal conductivity (TC) and excellent electromagnetic interference (EMI) shielding performance are prepared using CNFs as templates followed by coating with tannic acid non‐covalent and 3‐aminopropyltriethoxysilane covalent co‐modified graphene nanoplatelets (denoted as mGNPs) through a simple electrostatic self‐assembly method. The subsequent hot‐pressing process yield order and layer mGNPs in CNFs‐based composites with mGNPs distributed along the orientation and in close contact with CNFs, a fashion similar to the human nervous system. The resulting CNFs‐based composites reveal a high TC of 136.2 W/(m·K) and a superior EMI shielding effectiveness of 105 dB. Thus, they are used as wearable sensors based on the triboelectric effect to monitor human health in real‐time, as well as express emotion through Morse code. In sum, the proposed strategy provides an avenue to prolong the service life of flexible wearable sensors and ensure their safe use, promising for future wisdom in healthcare and smart robotics.

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One‐Hour Ambient‐Pressure‐Dried, Scalable, Stretchable MXene/Polyurea Aerogel Enables Synergistic Defense Against High‐Frequency Mechanical Shock and Electromagnetic Waves

Zheng,

Xu,

Liu

et al. 2024

Adv Funct Materials

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The rapid, energy‐efficient, scalable preparation of high‐strength, flexible, multifunctional nanostructured aerogels is highly desired yet challenging. Here, an ambient‐pressure‐dried (APD) strategy is developed involving self‐foaming, dip‐coating, and graphene oxide (GO)‐assisted multiple cross‐linking treatments for the prompt, large‐area preparation of polyurea/transition metal carbides/nitrides (MXenes) aerogels. The APD MXene‐based aerogels showcase low density, remarkable mechanical strength, and ultraflexiblity involving stretchability, good conductivity, hydrophobicity, and high resistance to various solvents. Synergies of robust, elastic cell walls and porous structure contribute to high‐efficiency absorption of high‐frequency, high‐speed mechanical shock waves for the aerogels, significantly transcendinging the biomasses, plastics, elastomers, ceramics, and metals. In addition to the excellent microwave shielding performance of over 40 dB in ultrabroadband frequencies of 4–40 GHz, the oxidation stability is elevated for APD MXene aerogels, consequently yielding applicability in harsh conditions. Furthermore, the superior light absorption capability of aerogels leads to the efficient photothermal conversion, therapy, antibacterial, desalination, water purification, deicing, and thick oil absorption. This work provides a facile, time‐ and energy‐efficient, scalable APD methodology for manufacturing large‐area, high‐strength, ultraflexible, multifunctional MXene‐based aerogels, enlighting a novel synergistic defense against mechanical shock and electromagnetic waves, and promoting them as a prospective candidate in aerospace, device protection, and next‐generation electronics.

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Preparation of ambient-dried multifunctional cellulose aerogel by freeze-linking technique

Cited by 27 publications

References 52 publications

Effects of Freeze-Drying Processes on the Acoustic Absorption Performance of Sustainable Cellulose Nanocrystal Aerogels

Effects of Freeze-Drying Processes on the Acoustic Absorption Performance of Sustainable Cellulose Nanocrystal Aerogels

Human Nervous System Inspired Modified Graphene Nanoplatelets/Cellulose Nanofibers‐Based Wearable Sensors with Superior Thermal Management and Electromagnetic Interference Shielding

One‐Hour Ambient‐Pressure‐Dried, Scalable, Stretchable MXene/Polyurea Aerogel Enables Synergistic Defense Against High‐Frequency Mechanical Shock and Electromagnetic Waves

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