scholarly journals Layer-by-layer self-assembly preparation and desalination performance of graphene oxide membrane

2021 ◽  
Author(s):  
Jun Hu ◽  
Zuoguo Yang
Keyword(s):  
Graphene Oxide ◽  
Self Assembly ◽  
Composite Membranes ◽  
Rejection Rate ◽  
Cationic Polyelectrolyte ◽  
Layer By Layer ◽  
Operating Pressure ◽  
High Flux ◽  
Assembly Method ◽  
Multi Stage

Abstract Unlike previous utilization of ultrafiltration membranes as supporters of graphene oxide (GO) composite membranes, this study first adopts microporous nylon membranes as substrates. The cationic polyelectrolyte/GO composite membranes are prepared by the layer-by-layer self-assembly method via electrostatic attraction. The introduction of polycations between nanochannels in the GO membranes effectively suppresses the swelling and improves the stability of the membranes. It is found that the polyelectrolytes' charge density and the surface potential of the composite membranes jointly determine the membranes' properties. The experimental results show that the novel GO membranes can obtain high flux and considerable desalination performance under low operating pressure. Typically, the salt rejection rate reaches 66.8% for 1.0 g/L MgSO4, and the flux is 39.8 L·m−2·h−1·bar−1. Benefitting from the GO composite membranes keeping similar retention for both high and low concentration salt solutions, the ideal desalination performance could be obtained through multi-stage processes on the premise of ensuring high flux, which is more suitable for industry.

A wearable and highly sensitive strain sensor based on a polyethylenimine–rGO layered nanocomposite thin film

2017 ◽  
Vol 5 (31) ◽  
pp. 7746-7752 ◽  
Author(s):  
Xueliang Ye ◽  
Zhen Yuan ◽  
Huiling Tai ◽  
Weizhi Li ◽  
Xiaosong Du ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Strain Sensor ◽  
Layer By Layer ◽  
Nanocomposite Thin Film ◽  
Assembly Method ◽  
Reduced Graphene ◽  
Highly Sensitive

A novel strain sensor based on reduced graphene oxide with ultra-sensitive and ultra-durable performance was fabricated by the chemical layer-by-layer self-assembly method.

The assembly and photoelectronic property of reduced graphene oxide/porphyrin/phthalocyanine composite films

RSC Advances ◽  
2015 ◽  
Vol 5 (52) ◽  
pp. 42063-42068 ◽  
Author(s):  
Meijuan Zhang ◽  
Bing Yuan ◽  
Shi-zhao Kang ◽  
Lixia Qin ◽  
Guodong Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Composite Films ◽  
Layer By Layer ◽  
Assembly Method ◽  
Reduced Graphene ◽  
Porphyrin Phthalocyanine

By a layer-by-layer self-assembly method, reduced graphene oxide-based composite films with high photoelectronic activity were assembled with 5,10,15,20-tetrakis(p-N,N,N-trimethylanilinium)porphyrin and copper sulfophthalocyanine as the co-sensitizers.

Facile preparation of COF composite membranes for nanofiltration by stoichiometric spraying layer-by-layer self-assembly

2020 ◽  
Vol 56 (3) ◽  
pp. 419-422 ◽  
Author(s):  
Shuang Hao ◽  
Lu Jiang ◽  
Yongliang Li ◽  
Zhiqian Jia ◽  
Bart Van der Bruggen
Keyword(s):  
Self Assembly ◽  
Composite Membranes ◽  
Layer By Layer ◽  
Excellent Performance ◽  
Assembly Method ◽  
Facile Preparation

COF–LZU1 membranes are prepared by a stoichiometric spraying layer-by-layer self-assembly method and the membranes display excellent performance for dye separation.

Preparation of graphene oxide–chitosan nanocapsules and their applications as carriers for drug delivery

RSC Advances ◽  
2016 ◽  
Vol 6 (106) ◽  
pp. 104522-104528 ◽  
Author(s):  
Yanbao Li ◽  
Lei Jiang
Keyword(s):  
Drug Delivery ◽  
Graphene Oxide ◽  
Self Assembly ◽  
Layer By Layer ◽  
Assembly Method

The stable graphene oxide–chitosan nanocapsules as carriers for drug delivery were prepared via layer-by-layer self-assembly method.

scholarly journals Impact of Layer-by-Layer Self-Assembly Clay-Based Nanocoating on Flame Retardant Properties of Sisal Fiber Cellulose Microcrystals

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Chun Wei ◽  
Sihua Zeng ◽  
Yuyuan Tan ◽  
Wu Wang ◽  
Jian Lv ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Flame Retardant ◽  
Self Assembly ◽  
Cationic Polyelectrolyte ◽  
Sisal Fiber ◽  
Layer By Layer ◽  
Gravimetric Analysis ◽  
Assembly Method ◽  
Flame Retardant Properties ◽  
Xrd Patterns

The renewable cationic polyelectrolyte chitosan (CH) and anionic nanomontmorillonite (MMT) layers were alternately deposited on the surface of sisal fiber cellulose microcrystals (SFCM) via layer-by-layer (LBL) self-assembly method. The structure and properties of the composites were characterized by zeta potential, thermal gravimetric analysis (TGA), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectrometer (FTIR), microcalorimeter (MCC), and so forth. The zeta potential results show that the cellulose microcrystalline surface charge reversed due to the adsorption of CH and MMT nanoplatelets during multilayer deposition. MMT characteristic diffraction peaks appear in XRD patterns of SFCM(CH/MMT)5and SFCM(CH/MMT)10composites. Additionally, FESEM reveals that the SFCM(CH/MMT)10surface is covered with a layer of material containing Si, which has been verified by elemental analysis. TGA results show that the initial decomposition (weight loss of 5%) temperature of SFCM(CH/MMT)5is increased by 4°C compared to that of pure SFCM. On the other hand, carbon residue percentage of SFCM(CH/MMT)10is 25.1%, higher than that of pure SFCM (5.4%) by 19.7%. Eventually, it is testified by MCC measurement that CH/MMT coating can significantly reinforce the flame retardant performance of SFCM.

Layer-by-layer self-assembly of PDDA/PWA–Nafion composite membranes for direct methanol fuel cells

2010 ◽  
Vol 46 (9) ◽  
pp. 1434 ◽  
Author(s):  
Meng Yang ◽  
Shanfu Lu ◽  
Jinlin Lu ◽  
San Ping Jiang ◽  
Yan Xiang
Keyword(s):  
Fuel Cells ◽  
Self Assembly ◽  
Direct Methanol Fuel Cells ◽  
Composite Membranes ◽  
Layer By Layer ◽  
Direct Methanol ◽  
Methanol Fuel Cells

scholarly journals Direct Patterning and Spontaneous Self-Assembly of Graphene Oxide via Electrohydrodynamic Jet Printing for Energy Storage and Sensing

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 13 ◽  
Author(s):  
Bin Zhang ◽  
Jaehyun Lee ◽  
Mincheol Kim ◽  
Naeeung Lee ◽  
Hyungdong Lee ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Storage ◽  
Self Assembly ◽  
High Performance ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Layer By Layer ◽  
Energy Storage Devices ◽  
Laminar Structure ◽  
Jet Printing

The macroscopic assembly of two-dimensional materials into a laminar structure has received considerable attention because it improves both the mechanical and chemical properties of the original materials. However, conventional manufacturing methods have certain limitations in that they require a high temperature process, use toxic solvents, and are considerably time consuming. Here, we present a new system for the self-assembly of layer-by-layer (LBL) graphene oxide (GO) via an electrohydrodynamic (EHD) jet printing technique. During printing, the orientation of GO flakes can be controlled by the velocity distribution of liquid jet and electric field-induced alignment spontaneously. Closely-packed GO patterns with an ordered laminar structure can be rapidly realized using an interfacial assembly process on the substrates. The surface roughness and electrical conductivity of the LBL structure were significantly improved compared with conventional dispensing methods. We further applied this technique to fabricate a reduced graphene oxide (r-GO)-based supercapacitor and a three-dimensional (3D) metallic grid hybrid ammonia sensor. We present the EHD-assisted assembly of laminar r-GO structures as a new platform for preparing high-performance energy storage devices and sensors.

Hydrogen-Bonding Layer Protecting Polyelectrolyte Capsules and Its Mechanical Property Study with Atomic Force Microscope

2008 ◽  
Vol 8 (6) ◽  
pp. 2996-3002 ◽  
Author(s):  
Liqin Ge ◽  
Xing Wang ◽  
Long Ba ◽  
Zhongze Gu
Keyword(s):  
Hydrogen Bonding ◽  
Atomic Force Microscope ◽  
Elastic Deformation ◽  
Self Assembly ◽  
Laser Scanning ◽  
Confocal Laser ◽  
Bonding Layer ◽  
Layer By Layer ◽  
Assembly Method ◽  
Atomic Force

The hydrogen-bonding multilayered polyelectrolyte capsules with sizes around 6 μm were fabricated by layer-by-layer self-assembly method. The morphology of the obtained capsules was observed with Scanning Electron Microscope (SEM), Confocal Laser Scanning Microscope (CLSM) and Atomic Force Microscope (AFM), respectively. The elastic properties of the capsules were studied with AFM. The capsule was pressed by cantilever with different lengths, a glass bead glued at the end of the cantilever. The force curves were measured on the capsule in air. The Young's modulus of the capsule was obtained (E = 170 MPa for the loading). Results show that this model can predict the elastic deformation of the microcapsule. The accuracy of the elastic deformation of polymer capsule can be ensured using a cantilever of mediate stiffness. Our results show that the existence of the hydrogen-bonding layer makes the multilayered polyelectrolyte harder in comparison with the pure multilayered polyelectrolyte capsules.

Sign in / Sign up

Export Citation Format

Share Document