The influence of the drying method on the microstructure and the compression behavior of graphene aerogel

Xie, Jing; Niu, Ling; Qiao, Yang; Lei, Yinze; Li, Guangyong; Zhang, Xuetong; Chen, Pengwan

doi:10.1016/j.diamond.2021.108772

Cited by 17 publications

(6 citation statements)

References 60 publications

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“…However, the BET specific surface areas of the two are 1.132 and 0.066 m 2 /g, respectively, indicating that CHMS has a specific surface area approximately 17 times that of CHMP. This is due to the fact that in the preparation of CHMS, a phase separation between the hydrogel and ice in the swelling microspheres occurred when the freeze‐drying was performed, and the hydrogel phase shrank partially while the ice sublimated, which led to formation of the petal‐shape surface with lots of folds and pores on CHMS 31,32 . This procedure of freeze‐drying not only preserves the original shape of the hydrogel microspheres to the maximum extent, but also helps to significantly improve their specific surface area.…”

Section: Resultsmentioning

confidence: 99%

Preparation of a cationic hydrogel microsphere adsorbent for efficient removal of hexavalent chromium from aqueous solution

Ye,

Zhang,

et al. 2024

J of Applied Polymer Sci

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Herein, a cationic hydrogel microsphere (CHMS) was prepared by inverse suspension polymerization and freeze‐drying and was applied to the adsorptive removal of hexavalent chromium (Cr(VI)) from aqueous solution. Morphological characterization shows that there are lots of folds and pores on the surface of CHMS with a unique petal‐like appearance. According to the chemical structure analysis, CHMS contains plenty of functional groups such as amine and hydroxyl groups. These features give CHMS a larger specific surface area, faster adsorption rate, and higher adsorption capacity than the conventional cationic hydrogel microparticle (CHMP) adsorbent. The adsorption of Cr(VI) in water by CHMS is mainly based on the combination of electrostatic adsorption and redox reaction, with the electrostatic interaction between the protonated amine and Cr(VI) serving as the predominant adsorption mechanism. Experimental results reveal that CHMS can efficiently remove Cr(VI) from simulated wastewater in both batch and continuous adsorption modes, which is primarily due to its distinctive surface morphology and rich functional groups. Furthermore, the common coexisting metal ions in Cr(VI)‐containing wastewater have no substantial negative influence on the adsorption. Therefore, it can be concluded that CHMS has a promising application prospect in the treatment of Cr(VI)‐containing wastewater.

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Section: Resultsmentioning

confidence: 99%

Preparation of a cationic hydrogel microsphere adsorbent for efficient removal of hexavalent chromium from aqueous solution

Ye,

Zhang,

et al. 2024

J of Applied Polymer Sci

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“…2 b,c. The results revealed that all GG/EL aerogels typically comprise an interconnected 3D porous structure with distinct pores, primarily attributed to the sublimation of water during the freeze-drying process, which is desirable for storing the absorbed oil 25 . The GG/EL aerogel demonstrates an extensive range of pore sizes and numerous macro-pores as a result of the extensive cross-linking with glutaraldehyde.…”

Section: Resultsmentioning

confidence: 99%

Investigation of synergistic effects incorporating esterified lignin and guar gum composite aerogel for sustained oil spill cleanup

Montazeri,

Norouzbeigi

2024

Sci Rep

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The recently developed aerogel demonstrates a high capacity for pollutant absorption, making it an environmentally friendly option for oily water treatment. In an effort to reduce the adverse effects of the black liquor accumulation in the pulp industry, this study focused on utilizing the mentioned abundant bio-resource lignin, which can be applied to various high-value applications such as 3D porous materials for oil spill cleanup. Lignin, precipitated from the black liquor, was esterified using maleic anhydride as the esterifying reagent to enhance the hydrophobicity. Then, the composite aerogel fabricated from esterified lignin and guar gum (GG) was successfully prepared through the facile freeze-drying, using glutaraldehyde (GA) as the cross-linker. The resulting aerogel exhibited high porosity values exceeding 95%, low density (27.4 mg/cm3), and an impressive absorption capacity of 32.5 g/g for sunflower oil. These results demonstrate the potential of black liquor utilization as a bio-waste source of lignin and highlight the cost-effective guar gum-esterified lignin composite aerogel, which exhibits remarkable oil absorption capabilities and environmental sustainability promotion.

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“…Besides, the drying method during the freeze-casting process can also influence the proportion of residual oxygen-containing functional groups in GAs. Xie et al [40,76] explored the effects of traditional freeze-drying (FD) and supercritical CO 2 drying (ScD) on the properties and structures of GAs. They applied some surface analysis instruments and found that the ScD-processed samples have fewer residual oxygen-containing groups.…”

Section: Intrinsic Characteristics Of Componentsmentioning

confidence: 99%

A Review of the Mechanical Properties of Graphene Aerogel Materials: Experimental Measurements and Computer Simulations

Zhu

Borodich

et al. 2023

Materials

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Graphene aerogels (GAs) combine the unique properties of two-dimensional graphene with the structural characteristics of microscale porous materials, exhibiting ultralight, ultra-strength, and ultra-tough properties. GAs are a type of promising carbon-based metamaterials suitable for harsh environments in aerospace, military, and energy-related fields. However, there are still some challenges in the application of graphene aerogel (GA) materials, which requires an in-depth understanding of the mechanical properties of GAs and the associated enhancement mechanisms. This review first presents experimental research works related to the mechanical properties of GAs in recent years and identifies the key parameters that dominate the mechanical properties of GAs in different situations. Then, simulation works on the mechanical properties of GAs are reviewed, the deformation mechanisms are discussed, and the advantages and limitations are summarized. Finally, an outlook on the potential directions and main challenges is provided for future studies in the mechanical properties of GA materials.

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The influence of the drying method on the microstructure and the compression behavior of graphene aerogel

Cited by 17 publications

References 60 publications

Preparation of a cationic hydrogel microsphere adsorbent for efficient removal of hexavalent chromium from aqueous solution

Preparation of a cationic hydrogel microsphere adsorbent for efficient removal of hexavalent chromium from aqueous solution

Investigation of synergistic effects incorporating esterified lignin and guar gum composite aerogel for sustained oil spill cleanup

A Review of the Mechanical Properties of Graphene Aerogel Materials: Experimental Measurements and Computer Simulations

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