Modification of the Surface Morphology and Properties of Graphene Oxide and Multi-Walled Carbon Nanotube-Based Polyvinylidene Fluoride Membranes According to Changes in Non-Solvent Temperature

The effect of changes in non-solvent coagulation bath temperature on surface properties such as morphology and hydrophilicity were investigated in multi-walled carbon nanotubes (MWCNTs) and graphene oxide (GO)-based polyvinylidene fluoride (PVDF) membranes. The properties of pores (size, shape, and number) as well as membrane hydrophilicity were investigated using field emission scanning electron microscopy, Raman spectroscopy, optical microscopy, water contact angle, and water flux. Results showed that the pore size increased with an increase in coagulation temperature. The hydrophilic functional groups of the added carbon materials increased the solvent and non-solvent diffusion rate, which significantly increased the number of pores by 700% as compared to pure PVDF. Additionally, these functional groups changed the hydrophobic properties of pure PVDF into hydrophilic properties.

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Effect of Stirring on Hydrophobicity of PVDF/CNT Nanocomposite Coatings

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.938.199 ◽

2014 ◽

Vol 938 ◽

pp. 199-203 ◽

Cited By ~ 3

Author(s):

G. Prasad ◽

Arun Anand Prabu

Keyword(s):

Phase Separation ◽

Polyvinylidene Fluoride ◽

Fluorine Content ◽

Spray Coating ◽

Water Contact ◽

Superhydrophobic Coatings ◽

Coating Method ◽

Stirring Time ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Multi-walled carbon nanotubes (MWCNTs)-Polyvinylidene fluoride (PVDF) superhydrophobic coatings were prepared by a facile phase separation and spray coating method. The effect of phase separation and stirring on wettability has been studied. A transformation of hydrophobic to super-hydrophobic state is achieved with increasing CNT content. In the absence of CNTs, the neat PVDF coatings exhibited water contact angle (WCA) of 105o. A gradual increase in WCA is observed with increasing addition of CNTs, and reaches to super-hydrophobic state (WCA > 150o) for CNT content of 33%. FTIR studies revealed a stronger interaction between PVDF and CNT with increasing stirring time. FESEM images and EDAX data show uniform morphology and higher fluorine content, respectively for samples stirred for longer time when compared to shorter stirring time, and the results are discussed in detail.

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A study on the effects of the addition of graphene oxide and multi-walled carbon nanotubes for surface modification on polyvinylidene fluoride membranes

Materials Letters ◽

10.1016/j.matlet.2021.131311 ◽

2021 ◽

pp. 131311

Author(s):

Jungryeong Chae ◽

Hao Cheng ◽

Taeuk Lim ◽

Wonsuk Jung

Keyword(s):

Carbon Nanotubes ◽

Surface Modification ◽

Graphene Oxide ◽

Polyvinylidene Fluoride ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Graphene Oxide and Carbon Nanotubes-Based Polyvinylidene Fluoride Membrane for Highly Increased Water Treatment

Nanomaterials ◽

10.3390/nano11102498 ◽

2021 ◽

Vol 11 (10) ◽

pp. 2498

Author(s):

Jungryeong Chae ◽

Taeuk Lim ◽

Hao Cheng ◽

Jie Hu ◽

Sunghoon Kim ◽

...

Keyword(s):

Carbon Nanotubes ◽

Graphene Oxide ◽

Water Treatment ◽

Polyvinylidene Fluoride ◽

Water Flux ◽

Residual Chlorine ◽

Pvdf Membrane ◽

Filtration Performance ◽

Class 1 ◽

Multi Walled Carbon Nanotubes

As contaminated water increases due to environmental pollution, the need for excellent water treatment is increased, and several studies have reported the polyvinylidene fluoride (PVDF)-based water treatment membranes. However, the PVDF membrane has several problems such as low filtration performance, fouling resistance, and difficulty in precisely controlling the morphology of the pores and hydrophilicity. Therefore, we newly produced a water treatment PVDF membrane containing graphene oxide (GO) and multi-walled carbon nanotubes (MWCNTs) to improve the filtration performance. Surface properties of the fabricated membrane such as morphology, and size of pores, hydrophilicity, and water flux of the membrane were investigated. Additionally, the performance of these membrane filters was evaluated for free residual chlorine, turbidity, chromaticity, magnesium, sulfate, and particulates class 1 according to drinking water management act criteria, respectively. A performance improvement of at least 108.37% was observed compared to the Pure PVDF filter module and anti-fouling effects due to the functional groups of GO and MWCNTs. These results reveal that proposed membrane can accelerate the development of various water filtration applications.

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Influence of the Coagulation-Bath Temperature on Membrane Formation Mechanism and Properties of PVDF/TA-ATP Hybrid Membrane

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.713-715.2723 ◽

2015 ◽

Vol 713-715 ◽

pp. 2723-2726

Author(s):

Yue Rong Shi ◽

Gui Fang Zhang ◽

Xing Tian Liu ◽

Xue Tao Tian ◽

Yi Ping Zhao ◽

...

Keyword(s):

Formation Mechanism ◽

Vinylidene Fluoride ◽

Pure Water ◽

Water Flux ◽

Bath Temperature ◽

Time Domain Reflectometry ◽

Coagulation Bath ◽

Membrane Formation ◽

Water Permeation ◽

Ultrasonic Time

In this study, poly (vinylidene fluoride) (PVDF) hybrid membranes were prepared from polymeric blend of PVDF/tannic acid (TA)-Attapulgite (ATP)/PEG system via phase inversion induced by immersion precipitation in water coagulation bath. The membrane formation mechanism of PVDF/TA-ATP/PEG casting solutions in water bath thermodynamics at different temperatures and the process of membrane formation were investigated via cloud point determination and ultrasonic time-domain reflectometry (UTDR). The structures and properties of the membrane were characterized by scanning electron microscopy (SEM), and water permeation experiment, respectively. It was found that the rate of precipitation controlled by the Coagulation-Bath thermodynamics. With the coagulation temperature increasing, the gelation line was moved to non-solvent axis and the pure water flux were decreased.

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Multi-Walled Carbon Nanotubes/Graphene Oxide Composites for Humidity Sensing

IEEE Sensors Journal ◽

10.1109/jsen.2013.2273615 ◽

2013 ◽

Vol 13 (12) ◽

pp. 4749-4756 ◽

Cited By ~ 34

Author(s):

Xiaoyu Li ◽

Xiangdong Chen ◽

Yao Yao ◽

Ning Li ◽

Xinpeng Chen ◽

...

Keyword(s):

Carbon Nanotubes ◽

Graphene Oxide ◽

Humidity Sensing ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Oxide Composites

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Water-based polyurethane composite anticorrosive barrier coating via enhanced dispersion of functionalized graphene oxide in the presence of acidified multi-walled carbon nanotubes

Progress in Organic Coatings ◽

10.1016/j.porgcoat.2020.105734 ◽

2020 ◽

Vol 146 ◽

pp. 105734 ◽

Cited By ~ 1

Author(s):

Li-Chao Jing ◽

Tao Wang ◽

Wei-Wei Cao ◽

Jian-Gong Wen ◽

Hui Zhao ◽

...

Keyword(s):

Carbon Nanotubes ◽

Graphene Oxide ◽

Functionalized Graphene ◽

Functionalized Graphene Oxide ◽

Polyurethane Composite ◽

Barrier Coating ◽

Water Based ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Effect of Precipitation Temperature on the Properties of Cellulose Ultrafiltration Membranes Prepared via Immersion Precipitation with Ionic Liquid as Solvent

Membranes ◽

10.3390/membranes8040087 ◽

2018 ◽

Vol 8 (4) ◽

pp. 87 ◽

Cited By ~ 2

Author(s):

Daria Nevstrueva ◽

Arto Pihlajamäki ◽

Juha Nikkola ◽

Mika Mänttäri

Keyword(s):

Ionic Liquid ◽

Pure Water ◽

Polymer Concentration ◽

Water Flux ◽

Bath Temperature ◽

Liquid Solution ◽

Coagulation Bath ◽

Fouling Resistance ◽

Ultrafiltration Membranes ◽

Coagulation Bath Temperature

Supported cellulose ultrafiltration membranes are cast from a cellulose-ionic liquid solution by the immersion precipitation technique. The effects of coagulation bath temperature and polymer concentration in the casting solution on the membrane morphology, wettability, pure water flux, molecular weight cut-off, and fouling resistance are studied. Scanning electron microscopy, contact angle measurements, atomic force microscopy, and filtration experiments are carried out in order to characterise the obtained ultrafiltration cellulose membranes. The results show the effect of coagulation bath temperature and polymer concentration on the surface morphology and properties of cellulose ultrafiltration membranes. Optimisation of the two parameters leads to the creation of dense membranes with good pure water fluxes and proven fouling resistance towards humic acid water solutions.

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