Capillary shrinkage of graphene oxide hydrogels

Qi, Changsheng; Luo, Chong; Tao, Ying; Lv, Wei; Zhang, Chen; Deng, Yaohua; Li, Huan; Han, Junwei; Ling, Guowei; Yang, Quan‐Hong

doi:10.1007/s40843-019-1227-7

Cited by 46 publications

(31 citation statements)

References 43 publications

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“…The generated capillary pressure is directed to the concave liquid surface, the force along the graphene sheet can be used as the driving force for the removal of water from the fiber, and the force perpendicular to the graphene sheet will compress the graphene sheet, inducing shrinkage of the fiber. [ 22,28 ] It is demonstrated that a denser structure may be obtained by introducing graphene than that only with CNT in the fiber, indicating better mechanical properties. [ 29 ] When further increase the graphene content, the mechanical properties have a little decrease for the hardness increase of the fiber.…”

Section: Resultsmentioning

confidence: 99%

High Sensitivity Polyurethane‐Based Fiber Strain Sensor with Porous Structure via Incorporation of Bacterial Cellulose Nanofibers

Sheng

Zhang

et al. 2021

Adv Elect Materials

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With the rise of wearable devices, flexible sensors have received extensive attention and research due to their great potential in human health detection and joint motion. Here, a flexible fiber strain sensor is directly obtained by a common wet‐spinning method, which used thermoplastic polyurethane as the elastomer, carbon nanotubes, and graphene as conductive fillers by incorporating 2,2,6,6‐tetramethylpiperidine‐1‐oxyl oxidized bacterial cellulose nanofibers (BCN) as the dispersant and binding agent. The introduction of BCN can effectively improve the interaction between the polymer matrix and the conductive fillers, and bear a part of the tensile stress and the supporting force during the fiber formation, to form the porous structure, which can efficiently carry and transfer the tensile force. Under the synergistic effect of various components, the fiber strain sensor with wide response range (230%), high gauge factor values of 17.8 (0−70%), 326.6 (70−150%), and 1501.0 (150−230%), fast response time, and recovery time (≈100 ms), and long‐term cyclic stability (>10 000 cycles) are prepared. In the fiber sensor, the ideal combination of excellent strain sensing performance and flexible wearable characteristics has been realized which will be of great significance in the field of weaving, lightweight, and foldable electronic devices.

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Section: Resultsmentioning

confidence: 99%

High Sensitivity Polyurethane‐Based Fiber Strain Sensor with Porous Structure via Incorporation of Bacterial Cellulose Nanofibers

Sheng

Zhang

et al. 2021

Adv Elect Materials

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“…Finally, the capillary drying technology was employed to shrink this hydrogel into a dense monolith (∼20 × volume contraction), yielding the SiMP@C-GN product. Specifically, the hydrogel was subjected to an evaporation-induced drying at 70°C for 48 h under air and atmospheric pressure [ 22 , 23 , 37 ].…”

Section: Methodsmentioning

confidence: 99%

1000 Wh L−1 lithium-ion batteries enabled by crosslink-shrunk tough carbon encapsulated silicon microparticle anodes

Chen

Han

Kong

et al. 2021

National Science Review

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Microparticulate Si, normally shelled with carbons, features higher tap density and less interfacial side reactions compared to its nanosized counterpart, showing great potential to be applied as high energy lithium-ion battery anodes. However, localized high stress generated during fabrication and particularly, under operating, could induce cracking of carbon shells and release pulverized nanoparticles, significantly deteriorating its electrochemical performance. Here we design a strong yet ductile carbon cage from an easily processing capillary shrinkage of graphene hydrogel followed by precise tailoring of inner voids. Such a structure, analog to the stable structure of plant cells, presents “imperfection-tolerance” to volume variation of irregular Si microparticles, maintaining the electrode integrity over 1000 cycles with Coulombic efficiency over 99.5%. This design enables the use of a dense and thick (3 mAh cm–2) microparticulate Si anode with an ultrahigh volumetric energy density of 1048 Wh L–1 achieved at pouch full-cell level coupled with a LiNi0.8Co0.1Mn0.1O2 cathode.

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“…. 在进一步的研究中, Ma等人 [68] 将HOGS采用凝胶毛细致密化方法 [69] 制备了HOPC(highly ordered and compact porous carbon), 提出一种空间电荷密度(spatial charge density,…”

Section: Dvag在混合超级电容器中的应用unclassified

Recent progress on the preparation of three-dimensional vertically aligned graphene and its applications insupercapacitors

Zhang¹,

Zhang²,

Feng³

et al. 2021

Chin. Sci. Bull.

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Capillary shrinkage of graphene oxide hydrogels

Cited by 46 publications

References 43 publications

High Sensitivity Polyurethane‐Based Fiber Strain Sensor with Porous Structure via Incorporation of Bacterial Cellulose Nanofibers

High Sensitivity Polyurethane‐Based Fiber Strain Sensor with Porous Structure via Incorporation of Bacterial Cellulose Nanofibers

1000 Wh L−1 lithium-ion batteries enabled by crosslink-shrunk tough carbon encapsulated silicon microparticle anodes

Recent progress on the preparation of three-dimensional vertically aligned graphene and its applications insupercapacitors

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