Aqueous cellulose solution assisted direct exfoliation of graphite to high concentration graphene dispersion

Yu, Pengxiang; Wang, Xiao; Zhang, Kangmin; Zhou, Dengjian; Wu, Mingmei; Wu, Qingyun; Liu, Jiuyi; Zhang, Jianan

doi:10.1016/j.matlet.2020.129081

Cited by 15 publications

(5 citation statements)

References 16 publications

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“…[ 32 ] The G‐BC film exhibits a strong diffraction peak at 26.4° and a weak diffraction peak at 54.5°, corresponding to the (002) and (004) crystal planes of graphene. [ 33 ] The above result demonstrates that graphene maintains a good lattice structure and lamellar spatial arrangement after the introduction of BC nanofibers. After the polymerization of PPy, no obvious new diffraction peaks were observed in the PPy@G‐BC film.…”

Section: Resultsmentioning

confidence: 81%

Multi‐Functional Actuators Made with Biomass‐Based Graphene‐Polymer Films for Intelligent Gesture Recognition and Multi‐Mode Self‐Powered Sensing

Weng,

Zhou,

Zhou

et al. 2024

Advanced Science

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Multi‐functional actuation systems involve the mechanical integration of multiple actuation and sensor devices with external energy sources. The intricate combination makes it difficult to meet the requirements of lightweight. Hence, polypyrrole@graphene‐bacterial cellulose (PPy@G‐BC) films are proposed to construct multi‐responsive and bilayer actuators integrated with multi‐mode self‐powered sensing function. The PPy@G‐BC film not only exhibits good photo‐thermoelectric (PTE) properties but also possesses good hydrophilicity and high Young's modulus. Thus, the PPy@G‐BC films are used as active layers in multi‐responsive bilayer actuators integrated with self‐powered sensing functions. Here, two types of multi‐functional actuators integrated with self‐powered sensing functions is designed. One is a light‐driven actuator that realizes the self‐powered temperature sensing function through the PTE effect. Assisted by a machine learning algorithm, the self‐powered bionic hand can realize intelligent gesture recognition with an accuracy rate of 96.8%. The other is humidity‐driven actuators integrated a zinc‐air battery, which can realize self‐powered humidity sensing. Based on the above advantages, these two multi‐functional actuators are ingeniously integrated into a single device, which can simultaneously perform self‐powered temperature/humidity sensing while grasping objects. The highly integrated design enables the efficient utilization of environmental energy sources and complementary synergistic monitoring of multiple physical properties without increasing system complexity.

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Section: Resultsmentioning

confidence: 81%

Multi‐Functional Actuators Made with Biomass‐Based Graphene‐Polymer Films for Intelligent Gesture Recognition and Multi‐Mode Self‐Powered Sensing

Weng,

Zhou,

Zhou

et al. 2024

Advanced Science

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“…This effectiveness derives from the unique structural features of cellulose amphiphile macromolecules that confer their ability to bind to graphite and graphene surfaces. This has been recently further verified by making concentrated graphene dispersions [ 56 ].…”

Section: Discussionmentioning

confidence: 82%

Environmentally Friendly, High-Performance Fire Retardant Made from Cellulose and Graphite

et al. 2021

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Many materials and additives perform well as fire retardants and suppressants, but there is an ever-growing list of unfulfilled demands requiring new developments. This work explores the outstanding dispersant and adhesive performances of cellulose to create a new effective fire-retardant: exfoliated and reassembled graphite (ERG). This is a new 2D polyfunctional material formed by drying aqueous dispersions of graphite and cellulose on wood, canvas, and other lignocellulosic materials, thus producing adherent layers that reduce the damage caused by a flame to the substrates. Visual observation, thermal images and surface temperature measurements reveal fast heat transfer away from the flamed spots, suppressing flare formation. Pinewood coated with ERG underwent standard flame resistance tests in an accredited laboratory, reaching the highest possible class for combustible substrates. The fire-retardant performance of ERG derives from its thermal stability in air and from its ability to transfer heat to the environment, by conduction and radiation. This new material may thus lead a new class of flame-retardant coatings based on a hitherto unexplored mechanism for fire retardation and showing several technical advantages: the precursor dispersions are water-based, the raw materials used are commodities, and the production process can be performed on commonly used equipment with minimal waste.

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“…The precursor dispersion was obtained by dispersing BC in deionized water and isopropanol mixed solution, and then addition of graphite powder was added. Under vigorous sonication, the formed LEGr can be stabilized by BC through non-covalent intermolecular forces to obtain steady BC/LEGr-I composite dispersion ( Figure 1 a) [ 20 ]. After standing for six months, BC/LEGr-I dispersion remains stable without any significant precipitation.…”

Section: Resultsmentioning

confidence: 99%

“…Yu et al found that graphite can be exfoliated in MCC NaOH/urea solution to obtain a high concentration dispersion of 8.54 mg/mL by sonication-assisted LPE. The thickness of the graphene nanosheets obtained ranged from 0–6 nm [ 20 ]. Bacterial cellulose (BC) is a kind of nanocellulose with the characteristics of high aspect ratio, excellent mechanical properties, and good hydrophilicity [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Graphene Composite via Bacterial Cellulose Assisted Liquid Phase Exfoliation for Sodium-Ion Batteries

et al. 2022

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One of the most critical challenges for commercialization of sodium-ion battery (SIB) is to develop carbon anodes with high capacity and good rate performance. Graphene would be an excellent SIB anode candidate due to its success in various kinds of batteries. Liquid-phase exfoliation (LPE) method is an inexpensive, facile and potentially scalable method to produce less-defected graphene sheets. In this work, we developed an improved, dispersant-assisted LPE method to produce graphene composite materials from raw graphite with high yield and better quality for SIB anode. Here, bacterial cellulose (BC) was used as a green dispersant/stabilizer for LPE, a “spacer” for anti-restacking, as well as a carbon precursor in the composite. As a result, the carbonized BC (CBC)/LPE graphene (LEGr) presented improved performance compared to composite with graphene prepared by Hummers method. It exhibited a specific capacity of 233 mAh g−1 at a current density of 20 mA g−1, and 157 mAh g−1 after 200 cycles at a high current density of 100 mA g−1 with capacity retention rate of 87.73%. This method not only provides new insight in graphene composites preparation, but also takes a new step in the exploration of anode materials for sodium-ion batteriesSIBs.

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Aqueous cellulose solution assisted direct exfoliation of graphite to high concentration graphene dispersion

Cited by 15 publications

References 16 publications

Multi‐Functional Actuators Made with Biomass‐Based Graphene‐Polymer Films for Intelligent Gesture Recognition and Multi‐Mode Self‐Powered Sensing

Multi‐Functional Actuators Made with Biomass‐Based Graphene‐Polymer Films for Intelligent Gesture Recognition and Multi‐Mode Self‐Powered Sensing

Environmentally Friendly, High-Performance Fire Retardant Made from Cellulose and Graphite

Graphene Composite via Bacterial Cellulose Assisted Liquid Phase Exfoliation for Sodium-Ion Batteries

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