Graphene oxide membranes with stable porous structure for ultrafast water transport

Zhang, Wenhai; Yin, Ming‐Jie; Zhen, Qiang; Jin, Chao; Wang, Naixin; Ji, Shulan; Ritt, Cody L.; Elimelech, Menachem; An, Quan‐Fu

doi:10.1038/s41565-020-00833-9

Cited by 386 publications

(190 citation statements)

References 34 publications

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“…[10][11][12] Aqueous solutions or dispersions containing polymers and complementary building blocks are frozen to form ice crystal templates embedded within the monolith. [13][14][15][16][17] There are significant interests in modulating the nucleation, growth, shapes, sizes, and hierarchy of ice templates, [18][19][20][21][22][23] leading to emerging functionalities such as high strength materials, [24][25][26][27] sustainable composites, [28,29] solar-thermal evaporators, [30] etc. Microstructures of and gels.…”

Section: Introductionmentioning

confidence: 99%

Lyophilization‐Free Engineering of Polyelectrolyte Monolith by an Ice‐Dissolving‐Complexation Method

Zhou

Gong

et al. 2021

Adv Funct Materials

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Ice templating is a versatile strategy for structural engineering of hydrophilic polymers and composites, yet the removal of ice templates requires lengthy lyophilization, and the prepared materials need further crosslinking for use in water. This study introduces an ice-dissolving-complexation (IDC) method to prepare ice templating monolith in an hour without the need for ice sublimation under a vacuum. The aqueous solution of sodium carboxymethyl cellulose (CMCNa) is frozen, immersed in ethanol/Cu 2+ bath (−20 °C). Ice templates dissolved in ethanol, whereby the CMC-Cu 2+ complexation occurred simultaneously to stabilize CMC microstructures. The IDC method enables the preparation and stabilization of CMC monolith with pores and/or aligned channels in one step that is 30-50 times more efficient than lyophilization in terms of the time consumed for ice removal. The IDC method is applicable to various polyelectrolytes and hybrids for straightforward use in water, as exemplified by a proof-of-concept CMC-Cu 2+ -carbon nanotubes monolith, which exhibits high performance solar-steaming under one sun irradiation.

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Section: Introductionmentioning

confidence: 99%

Lyophilization‐Free Engineering of Polyelectrolyte Monolith by an Ice‐Dissolving‐Complexation Method

Zhou

Gong

et al. 2021

Adv Funct Materials

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“…Afterwards, with the decrease of moisture in films, free H + ions decreased and recombined with the negative functional groups immobilized on GO (such as COO–) [ 24 ] . Since the tortuous path produced by the layered stacked structure of GO makes the penetration of water molecules in the layer spacing direction [ 42,43 ] more difficult than the transport between layers, dehumidification becomes difficult and free ions cannot quickly combine with the negative functional groups. In this process, the potential difference between two sides of electrolyte gel still exists to promote the directional movement of ions in electrolyte (Figure 4h).…”

Section: Resultsmentioning

confidence: 99%

A Wearable Sustainable Moisture‐Induced Electricity Generator Based on rGO/GO/rGO Sandwich‐Like Structural Film

Chen

Xia

2021

Adv Elect Materials

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Green energy conversion is the first choice in solving contemporary energy pollution and shortages. In this work, a flexible moisture‐induced electricity generator is developed. Graphene oxide (GO) film is simply region‐treated by bilateral ultraviolet irradiation to obtain two special structural films—reduced graphene oxide (rGO)/GO/rGO sandwich‐like structural (rGrSF) film and rGrSF–GO composite film. The special sandwich‐like structure endows films with the capability to easily transport water molecules and difficultly release moisture that improves the adaptability of generator to environmental change. A single moisture‐induced electricity generator (MIEG) could supply an open circuit voltage of 215.7 mV for more than 3 h. 9 MIEGs successfully powered a light emitting diode (LED) in 1 h under moisture, and its total discharging process took about 5.5 h in a normal room condition, in which the LED kept lit for 1 h. Additionally, with outstanding flexibility, high stability, and reproducibility, the generator shows the potential in application of wearable electronics and it can generate sustainable electricity in the face of suddenly changes in humidity.

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“…6d and Table S2. Except the exciting rejection rate, the ZnO/rGO membranes exhibit much higher water permeance than those of the GO-based membranes reported so far (generally less than 80 L m − 2 h − 1 bar − 1 ) [41][42][43][44][45][46][47][48][49][50][51].…”

Section: Resultsmentioning

confidence: 99%

General Synthesis of Ultrafine Metal Oxide/Reduced Graphene Oxide Nanocomposites for Ultrahigh-Flux Nanofiltration Membrane

Zhang¹,

Xu²,

Xie³

et al. 2021

Preprint

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Graphene-based membranes have great potential to revolutionize nanofiltration technology, but achieving high solute rejections at high water flux remains extremely challenging. Herein, a family of ultrafine metal oxide/reduced graphene oxide (rGO) nanocomposites are synthesized through a heterogenous nucleation and diffusion-controlled growth process for dye nanofiltration. The synthesis is based on the utilization of oxygen functional groups on GO surface as preferential active sites for heterogeneous nucleation, leading to the formation of sub-3nm size, monodispersing as well as high-density loading of metal oxide nanoparticles. The anchored ultrafine nanoparticles could inhibit the wrinkling of the rGO nanosheet, forming highly stable colloidal solutions for solution-processing fabrication of nanofiltration membranes. By functioning as pillars, the nanoparticles remarkably increase both vertical interlayer spacing and lateral tortuous paths of the rGO membranes, offering an unprecedented water permeability of 225 L m− 2 h− 1 bar − 1 and a high selectivity up to 98% in the size-exclusion separation of methyl blue.

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Graphene oxide membranes with stable porous structure for ultrafast water transport

Cited by 386 publications

References 34 publications

Lyophilization‐Free Engineering of Polyelectrolyte Monolith by an Ice‐Dissolving‐Complexation Method

Lyophilization‐Free Engineering of Polyelectrolyte Monolith by an Ice‐Dissolving‐Complexation Method

A Wearable Sustainable Moisture‐Induced Electricity Generator Based on rGO/GO/rGO Sandwich‐Like Structural Film

General Synthesis of Ultrafine Metal Oxide/Reduced Graphene Oxide Nanocomposites for Ultrahigh-Flux Nanofiltration Membrane

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