2D graphene oxide channel for water transport

2018 ◽  
Vol 209 ◽  
pp. 329-340 ◽  
Author(s):  
Baoxia Mi ◽  
Sunxiang Zheng ◽  
Qingsong Tu
Keyword(s):  
Graphene Oxide ◽  
Water Transport ◽  
Interlayer Spacing ◽  
Precise Control

Proper crosslinking and reduction can effectively prevent graphene oxide from swelling, thus enabling the precise control of interlayer spacing.

Precise control of the interlayer spacing between graphene sheets by hydrated cations

2019 ◽  
Vol 21 (14) ◽  
pp. 7623-7629 ◽  
Author(s):  
Yizhou Yang ◽  
Liuhua Mu ◽  
Liang Chen ◽  
Guosheng Shi ◽  
Haiping Fang
Keyword(s):  
Graphene Oxide ◽  
Interlayer Spacing ◽  
Graphene Sheets ◽  
Precise Control ◽  
Dft Computations ◽  
Graphene Oxide Sheets

Based on DFT computations, we show that different hydrated cations can precisely control the interlayer spacings between graphene sheets, which are smaller than that between graphene oxide sheets, indicating an ion sieving.

scholarly journals Free-standing reduced graphene oxide (rGO) membrane for salt-rejecting solar desalination via size effect

Nanophotonics ◽  
2020 ◽  
Vol 9 (15) ◽  
pp. 4601-4608 ◽  
Author(s):  
Pengyu Zhuang ◽  
Hanyu Fu ◽  
Ning Xu ◽  
Bo Li ◽  
Jun Xu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Conversion Efficiency ◽  
High Salinity ◽  
Interlayer Spacing ◽  
Structural Instability ◽  
Solar Thermal ◽  
Free Standing ◽  
Solar Desalination ◽  
Reduced Graphene

AbstractInterfacial solar vapor generation has revived the solar-thermal-based desalination due to its high conversion efficiency of solar energy. However, most solar evaporators reported so far suffer from severe salt-clogging problems during solar desalination, leading to performance degradation and structural instability. Here, we demonstrate a free-standing salt-rejecting reduced graphene oxide (rGO) membrane serving as an efficient, stable, and antisalt-fouling solar evaporator. The evaporation rate of the membrane reaches up to 1.27 kg m−2 h−1 (solar–thermal conversion efficiency ∼79%) under one sun, out of 3.5 wt% brine. More strikingly, due to the tailored narrow interlayer spacing, the rGO membrane can effectively reject ions, preventing salt accumulation even for high salinity brine (∼8 wt% concentration). With enabled salt-antifouling capability, flexibility, as well as stability, our rGO membrane serves as a promising solar evaporator for high salinity brine treatment.

Breakdown of water super-permeation in electrically insulating graphene oxide films: role of dual interlayer spacing

2018 ◽  
Vol 29 (32) ◽  
pp. 325706 ◽  
Author(s):  
Maheshwari Kavirajan Kavitha ◽  
Tushar Sakorikar ◽  
Pramitha Vayalamkuzhi ◽  
Manu Jaiswal
Keyword(s):  
Graphene Oxide ◽  
Oxide Films ◽  
Interlayer Spacing

Effects of Edge Functional Groups on Water Transport in Graphene Oxide Membranes

2019 ◽  
Vol 11 (8) ◽  
pp. 8483-8491 ◽  
Author(s):  
Ruosang Qiu ◽  
Shi Yuan ◽  
Jie Xiao ◽  
Xiao Dong Chen ◽  
Cordelia Selomulya ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Functional Groups ◽  
Water Transport ◽  
Oxide Membranes ◽  
Graphene Oxide Membranes

scholarly journals The Preparation and Study of Ethylene Glycol-Modified Graphene Oxide Membranes for Water Purification

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 188 ◽  
Author(s):  
Yang Zhang ◽  
Lin-Jun Huang ◽  
Jian-Guo Tang ◽  
Yao Wang ◽  
Meng-Meng Cheng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Graphene Oxide ◽  
Water Purification ◽  
Interlayer Spacing ◽  
Filtration Method ◽  
Vacuum Filtration ◽  
X Ray ◽  
Molecular Separation ◽  
Scanning Electron

In this work, graphene oxide (GO)/ethylene glycol (EG) membranes were designed by a vacuum filtration method for molecular separation and water purification. The composite membranes were characterized by scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The interlayer spacing of GO membranes (0.825 nm) and GO/EG membranes (0.634 nm) are measured by X-ray diffraction (XRD). Using the vacuum filtration method, the membrane thickness can be controlled by selecting the volume of the solution from which the membrane is prepared, to achieve high water permeance and high rejection of Rhodamine B (RhB). The membrane performance was evaluated on a dead-end filtration device. The water permeance and rejection of RhB of the membranes are 103.35 L m−2 h−1 bar−1 and 94.56% (GO), 58.17 L m−2 h−1 bar−1 and 97.13% (GO/EG), respectively. The permeability of GO/EG membrane is about 40 × 10−6 L m-1 h−1 bar−1. Compared with the GO membrane, the GO/EG membrane has better separation performance because of its proper interlayer spacing. In this study, the highest rejection of RhB (99.92%) is achieved. The GO/EG membranes have potential applications in the fields of molecular separation and water purification.

scholarly journals Enhancing the 3rd order nonlinear optical response of integrated micro-ring resonators with graphene oxide 2D films

2021 ◽  
Author(s):  
David Moss
Keyword(s):  
Graphene Oxide ◽  
Pump Power ◽  
Nonlinear Optical ◽  
Kerr Nonlinearity ◽  
Ring Resonators ◽  
Layer By Layer ◽  
Large Area ◽  
Strong Light ◽  
Precise Control ◽  
Lift Off

Abstract Layered two-dimensional (2D) graphene oxide (GO) films are integrated with micro-ring resonators (MRRs) to experimentally demonstrate enhanced nonlinear optics in the form of four-wave mixing (FWM). Both uniformly coated and patterned GO films are integrated on CMOS-compatible doped silica MRRs using a large-area, transfer-free, layer-by-layer GO coating method together with photolithography and lift-off processes, yielding precise control of the film thickness, placement, and coating length. The high Kerr nonlinearity and low loss of the GO films combined with the strong light-matter interaction within the MRRs results in a significant improvement in the FWM efficiency in the hybrid MRRs. Detailed FWM measurements are performed at different pump powers and resonant wavelengths for the uniformly coated MRRs with 1 − 5 layers of GO as well as the patterned devices with 10 − 50 layers of GO. The experimental results show good agreement with theory, achieving up to ~ 7.6-dB enhancement in the FWM conversion efficiency (CE) for an MRR uniformly coated with 1 layer of GO and ~ 10.3-dB for a patterned device with 50 layers of GO. By fitting the measured CE as a function of pump power for devices with different numbers of GO layers, we also extract the dependence of GO’s third-order nonlinearity on layer number and pump power, revealing interesting physical insights about the evolution of the layered GO films from 2D monolayers to quasi bulk-like behavior. These results confirm the high nonlinear optical performance of integrated photonic resonators incorporated with 2D layered GO films.

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