Optimization of coating solution viscosity of hollow fiber‐supported polydimethylsiloxane membrane for CO<sub>2</sub>/H<sub>2</sub> separation

Hu, Leiqing; Cheng, Jun; Li, Yannan; Liu, Jianzhong; Zhou, Jun-hu; Cen, Kefa

doi:10.1002/app.45765

Cited by 20 publications

(8 citation statements)

References 36 publications

(37 reference statements)

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“…[447][448][449][450][451]453,454,456,458,459,[463][464][465][466][467]472,473,475,[478][479][480]482,483,[484][485][486][487][488][489]496,497,[500][501][502]505,506,508,513,514,516,517,519,521,523,524,528,533,538,543]. One of the reasons for the low popularity of hydrophilic membranes is the low thermal and chemical stability of membranes, which in turn has an effect on the flux, demonstrated in Table…”

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confidence: 99%

CO2 capture using membrane contactors: a systematic literature review

Hafeez

Safdar

Pallari

et al. 2020

Front. Chem. Sci. Eng.

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With fossil fuel being the major source of energy, CO2 emission levels need to be reduced to a minimal amount namely from anthropogenic sources. Energy consumption is expected to rise by 48% in the next 30 years, and global warming is becoming an alarming issue which needs to be addressed on a thorough technical basis. Nonetheless, exploring CO2 capture using membrane contactor technology has shown great potential to be applied and utilised by industry to deal with post- and pre-combustion of CO2. A systematic review of the literature has been conducted to analyse and assess CO2 removal using membrane contactors for capturing techniques in industrial processes. The review began with a total of 2650 papers, which were obtained from three major databases, and then were excluded down to a final number of 525 papers following a defined set of criteria. The results showed that the use of hollow fibre membranes have demonstrated popularity, as well as the use of amine solvents for CO2 removal. This current systematic review in CO2 removal and capture is an important milestone in the synthesis of up to date research with the potential to serve as a benchmark databank for further research in similar areas of work. This study provides the first systematic enquiry in the evidence to research further sustainable methods to capture and separate CO2.

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confidence: 99%

CO2 capture using membrane contactors: a systematic literature review

Hafeez

Safdar

Pallari

et al. 2020

Front. Chem. Sci. Eng.

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“…However, the thickness of the nanolayer was not proportional to the concentration of the solution, and the layer thickens much faster than the increase of the concentration. It can be explained that the increase of the solid content in the solution leads to the advance of the solution viscosity, and a higher solution viscosity will make it easier to have more solution remained on the substrate and form a thicker film. , As a result, the thickness of the nanolayer increases significantly as the solution concentration increases.…”

Section: Resultsmentioning

confidence: 99%

“…It can be explained that the increase of the solid content in the solution leads to the advance of the solution viscosity, and a higher solution viscosity will make it easier to have more solution remained on the substrate and form a thicker film. 58,59 As a result, the thickness of the nanolayer increases significantly as the solution concentration increases. The properties of the plated copper film on the carrier copper foil are closely related to the thickness of the antiadhesion layer.…”

Section: Resultsmentioning

confidence: 99%

Additive Preparation of Conductive Circuit Based on Template Transfer Process Using a Reusable Photoresist

Zhu

Tang

Jin

et al. 2020

ACS Appl. Mater. Interfaces

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To solve the problems of a conventional subtractive process for preparing conductive circuits, numerous alternative additive processes have been investigated, such as screen or inkjet printing, selective electroless plating, laser-induced forward transfer, etc. They all lead to a simpler procedure, less pollution, and finer line width but are still faced with difficulties like low conductivity and thickness, poor adhesion, and high cost. PDMS is a kind of material with low surface energy, leading to low adhesion with adhesive. Under these circumstances, a simple template transfer process for additively preparing conductive circuits is reported. The process to form the template includes the preparation of a photolithographic mask on the carrier copper foil and adsorption of PDMS anti-adhesion coating. Followed by metal deposition through electroplating on the template, the conductive circuits are transferred to the target substrate. Thus, the designed conductive circuits on various substrates including paper and cloth are formed. The template can be used again after being reimmersed into PDMS anti-adhesion coating. The components and the concentration of the coating are carefully discussed, and the mechanism of anti-adhesion is also researched by EIS and XPS. The copper circuits show a line width of 10 μm, a peeling strength of 7.11 N/cm, and a resistivity of 1.93 μΩ·cm, which is similar to that of bulk copper. With low pollution and cost, high versatility, and good electrical and adhesion performance, the template transfer process shows a good application prospect in the large-scale production of flexible electronics like sensors, RFID tags, etc.

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“…With a thicker coating layer, the gas permeance would normally decrease. 28,29 Longer holding time in coating solution also allows more intrusion of PDMS into the pores subsequently increasing the layer thickness as suggested by Hu et al 18 It should be noted that the holding time should not be too long, exceeding the gelation time of PDMS coating solution. Interestingly, both gases uphold the same permeance at 200 s and 900 s, which could be a sign that coating is present inconsistently.…”

Section: Machine Dip-coating -Influence Of Membrane Holding Timementioning

confidence: 95%

“…17 Not to mention, large surface pore could also limit the amount of PDMS solution that can adhere to the membrane's surface. 18 Nevertheless, as the solution becomes glutinous after 15 min, this suggested that crosslinking of PDMS is occurring and transfixed on the membrane's surface.…”

Section: Characterisation Of Manually Dip-coated Pes Hollow Fibre Membranementioning

confidence: 99%

Fabrication of polydimethylsiloxane (PDMS) dense layer on porous polyethersulfone (PES) hollow fibre membrane with varying dip coating parameters

Hassan

Ahmad

Shafie

et al. 2021

JPS

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Polydimethylsiloxane (PDMS) is commonly used as a separating layer in gas separation membrane, hydrocarbon separation process, pervaporation and as a viable gutter layer in composite membrane fabrication. A methodical dip coating technique was used to fabricate PDMS dense layer on porous polyethersulfone (PES) hollow fibre membrane. Dip coating parameters such as coating speed (5-15 mm s -1 ) and holding time (10-900 s) were varied using an automated dip coating machine. Scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy characterisation were also conducted to investigate the membrane morphology and confirmed the presence of a coating on the membrane surface. Gas permeation performance test was carried out with CO 2 and N 2 under transmembrane pressure of 1 to 3 bars after membrane coating was finalised. The test results indicated that the coating speed inflicted less influence in the overall performance with a selectivity of 0.86. Gas permeance also exceeded 20,000 GPU mark at a lower speed, suggesting that a single coating at this speed range could not fully coat the porous PES fibres. Nevertheless, reduction of permeance with increasing speed indicates an improvement in the PDMS layer thickness. On the other hand, holding time in the coating solution showed a slight effect on membrane performance compared to the coating speed. However, the membrane exhibits drop in permeance reaching below 1,000 GPU at high holding time, suggesting a more complete coverage of the support with the PDMS layer. Hypothetically, it is caused by the increased viscosity during the PDMS crosslinking reaction as time passed, allowing more PDMS solution to be retained on the PES fibre's surface.

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Optimization of coating solution viscosity of hollow fiber‐supported polydimethylsiloxane membrane for CO₂/H₂ separation

Cited by 20 publications

References 36 publications

CO2 capture using membrane contactors: a systematic literature review

CO2 capture using membrane contactors: a systematic literature review

Additive Preparation of Conductive Circuit Based on Template Transfer Process Using a Reusable Photoresist

Fabrication of polydimethylsiloxane (PDMS) dense layer on porous polyethersulfone (PES) hollow fibre membrane with varying dip coating parameters

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Optimization of coating solution viscosity of hollow fiber‐supported polydimethylsiloxane membrane for CO2/H2 separation

Cited by 20 publications

References 36 publications

CO2 capture using membrane contactors: a systematic literature review

CO2 capture using membrane contactors: a systematic literature review

Additive Preparation of Conductive Circuit Based on Template Transfer Process Using a Reusable Photoresist

Fabrication of polydimethylsiloxane (PDMS) dense layer on porous polyethersulfone (PES) hollow fibre membrane with varying dip coating parameters

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Optimization of coating solution viscosity of hollow fiber‐supported polydimethylsiloxane membrane for CO₂/H₂ separation