Investigation of the permeability and selectivity of gases and volatile organic compounds for polydimethylsiloxane membranes

Bo, Inge De; Langenhove, Herman Van; Pruuost, Peter; Neve, Jeroen De; Pieters, Jan; Vankelecom, Ivo F.J.; Dick, Erik

doi:10.1016/s0376-7388(03)00024-3

Cited by 42 publications

(10 citation statements)

References 25 publications

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“…As seen in Figure 4a, no influence of the PDMS cross-linking temperature on the CO 2 and N 2 permeability was detected and materials with different fabrication conditions gave similar gas transport rates. These values of both CO 2 and N 2 permeabilities are in good agreement with the reported values in the literature for PDMS [21,22,23,24], considering the measurement temperature. In the case of Pebax-1657, the permeability with different thicknesses (as shown in Figure 4b) was measured, and the results are also reproducible within experimental error.…”

Section: Resultssupporting

confidence: 91%

Thickness Effect on CO2/N2 Separation in Double Layer Pebax-1657®/PDMS Membranes

2018

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The effect of thickness in multilayer thin-film composite membranes on gas permeation has received little attention to date, and the gas permeances of the organic polymer membranes are believed to increase by membrane thinning. Moreover, the performance of defect-free layers with known gas permeability can be effectively described using the classical resistance in series models to predict both permeance and selectivity of the composite membrane. In this work, we have investigated the Pebax®-MH1657/PDMS double layer membrane as a selective/gutter layer combination that has the potential to achieve sufficient CO2/N2 selectivity and permeance for efficient CO2 and N2 separation. CO2 and N2 transport through membranes with different thicknesses of two layers has been investigated both experimentally and with the utilization of resistance in series models. Model prediction for permeance/selectivity corresponded perfectly with experimental data for the thicker membranes. Surprisingly, a significant decrease from model predictions was observed when the thickness of the polydimethylsiloxane (PDMS) (gutter layer) became relatively small (below 2 µm thickness). Material properties changed at low thicknesses—surface treatments and influence of porous support are discussed as possible reasons for observed deviations.

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Section: Resultssupporting

confidence: 91%

Thickness Effect on CO2/N2 Separation in Double Layer Pebax-1657®/PDMS Membranes

2018

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“…PDMS was chosen for its elastomeric and hydrophobic properties, allowing the devices to remain flexible and conformable, similar to that of the original cotton thread substrates and to better repel aqueous solutions during washing. Additionally, PDMS is known to be gas permeable, such that the target analyte can still reach the optical dyes 26–30 . The PDMS coating allows for the thread to withstand aqueous conditions that would normally wash away a significant portion of the dye that was adhered onto the original thread substrate.…”

Section: Resultsmentioning

confidence: 99%

Colorimetric Gas Sensing Washable Threads for Smart Textiles

Owyeung

Panzer

Sonkusale

2019

Sci Rep

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A fabrication method for a stable entrapment of optically responsive dyes on a thread substrate is proposed to move towards a detection system that can be integrated into clothing. We use the dyes 5,10,15,20-Tetraphenyl-21H,23H-porphine manganese(III) chloride (MnTPP), methyl red (MR), and bromothymol blue (BTB), for a proof-of-concept. Our optical approach utilizes a smartphone to extract and track changes in the red (R), green (G) and blue (B) channel of the acquired images of the thread to detect the presence of an analyte. We demonstrate sensing of 50–1000 ppm of vapors of ammonia and hydrogen chloride, components commonly found in cleaning supplies, fertilizer, and the production of materials, as well as dissolved gas sensing of ammonia. The devices are shown to be stable over time and with agitation in a centrifuge. This is attributed to the unique dual step fabrication process that entraps the dye in a stable manner. The facile fabrication of colorimetric gas sensing washable threads is ideal for the next generation of smart textile and intelligent clothing.

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“…Gas sampling bags (1-L) were purchased from Newstar Environmental (Roswell, GA) and were fitted with butyl rubber O-rings, which are less permeable than standard silicone rubber O-rings. 18,19 Cambridge filter pads were obtained from Whatman (Buckinghamshire, UK) and following sample collection were placed in 20-mL headspace vials from MicroLiter Analytical Supplies (Suwanee, GA) for analysis. Pre-cleaned PTFE-backed crimp caps were purchased from The Lab Depot (Dawsonville, GA).…”

Section: Methodsmentioning

confidence: 99%

Mainstream Smoke Levels of Volatile Organic Compounds in 50 U.S. Domestic Cigarette Brands Smoked With the ISO and Canadian Intense Protocols

Pazo

Moliere

Sampson

et al. 2016

NICTOB

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Introduction A significant portion of the increased risk of cancer and respiratory disease from exposure to cigarette smoke is attributed to volatile organic compounds (VOCs). In this study, 21 VOCs were quantified in mainstream cigarette smoke from 50 U.S. domestic brand varieties that included high market share brands and two Kentucky research cigarettes (3R4F and 1R5F). Methods Mainstream smoke was generated under ISO 3308 and Canadian Intense (CI) smoking protocols with linear smoking machines with a gas sampling bag collection followed by SPME/GC/MS analysis. Results For both protocols, mainstream smoke VOC amounts among the different brand varieties were strongly correlated between the majority of the analytes. Overall, Pearson correlation (r) ranged from 0.68 to 0.99 for ISO and 0.36 to 0.95 for CI. However, monoaromatic compounds were found to increase disproportionately compared to unsaturated, nitro, and carbonyl compounds under the CI smoking protocol where filter ventilation is blocked. Conclusions Overall, machine generated “vapor phase” amounts (μg/cigarette) are primarily attributed to smoking protocol (e.g., blocking of vent holes, puff volume, and puff duration) and filter ventilation. A possible cause for the disproportionate increase in monoaromatic compounds could be increased pyrolysis under low oxygen conditions associated with the CI protocol.

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Investigation of the permeability and selectivity of gases and volatile organic compounds for polydimethylsiloxane membranes

Cited by 42 publications

References 25 publications

Thickness Effect on CO2/N2 Separation in Double Layer Pebax-1657®/PDMS Membranes

Thickness Effect on CO2/N2 Separation in Double Layer Pebax-1657®/PDMS Membranes

Colorimetric Gas Sensing Washable Threads for Smart Textiles

Mainstream Smoke Levels of Volatile Organic Compounds in 50 U.S. Domestic Cigarette Brands Smoked With the ISO and Canadian Intense Protocols

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