Journal ArticleDOI
Thermodynamic study on dynamic water vapor sorption in Sylgard-184.
TLDR
The results demonstrate that moisture is able to penetrate the material over a range of temperatures and humidities and quantitatively assesses how water vapor diffuses and ad/absorbs into polymeric materials that are traditionally considered hydrophobic.Abstract:
The dynamic and equilibrium water vapor sorption properties of Sylgard-184, a commercially available poly(dimethylsiloxane) elastomer (PDMS), were determined via gravimetric analysis from 30 to 70 °C. Described here is a methodology for quantitatively assessing how water vapor diffuses and ad/absorbs into polymeric materials that are traditionally considered hydrophobic. PDMS materials are frequently chosen for their moisture barrier properties; our results, however, demonstrate that moisture is able to penetrate the material over a range of temperatures and humidities. The sorption values measured here ranged from ca. 0.1 to 1.4 cm3 (STP) H2O/g Sylgard. The isotherms exhibited sigmoidal character and were fit to a triple mode sorption model. Asymptotic behavior at low water activities was characterized using a Langmuir type adsorption model, linear behavior was fit to a Henry’s law type dependence, and the convex portion at higher activities was fit with good agreement to Park’s equation for pooling or c...read more
Citations
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Journal ArticleDOI
Water Uptake Study of Anion Exchange Membranes
Yiwei Zheng,Uri Ash,Ravi P. Pandey,Amobi G. Ozioko,Julia Ponce-González,Michael Handl,Thomas Weissbach,John R. Varcoe,Steven Holdcroft,Matthew W. Liberatore,Renate Hiesgen,Dario R. Dekel +11 more
TL;DR: In this paper, the equilibrium state and kinetics of water uptake in anion exchange membrane fuel cells (AEMFCs) with different backbones (fluorinated and hydrocarbon-based backbones) and different functional groups were investigated.
Journal ArticleDOI
Adaptive Wetting—Adaptation in Wetting
Hans-Jürgen Butt,Rüdiger Berger,Werner Steffen,Doris Vollmer,Stefan A. L. Weber,Stefan A. L. Weber +5 more
TL;DR: The aim of the proposed model is to provide a quantitative description of adaptive wetting and to link changes in contact angles to microscopic adaptation processes.
Journal ArticleDOI
Methodical evaluation and improvement of matrix compatible PDMS-overcoated coating for direct immersion solid phase microextraction gas chromatography (DI-SPME-GC)-based applications.
TL;DR: The evaluation showed that the PDMS-overcoated fibers considerably slowed down the coating fouling process during direct immersion in complex matrices of high sugar content, and it was demonstrated that the uniformity of the overcoated PDMS layer is paramount to the achievement of reliable data and extended fiber lifetime.
Journal ArticleDOI
Active liquid degassing in microfluidic systems
J. Mikael Karlsson,Muriel Gazin,Sanna Laakso,Tommy Haraldsson,Surbhi Malhotra-Kumar,Minna Mäki,Herman Goossens,Wouter van der Wijngaart +7 more
TL;DR: The water loss and permeability change with the amount of added Teflon AF to the membrane is presented and bubble-free, multiplex DNA amplification using PCR in a PDMS microfluidic device is demonstrated.
Journal ArticleDOI
Comprehensive review on the transport and reaction of oxygen and moisture towards coupled oxidative ageing and moisture damage of bitumen
TL;DR: In this paper, the authors provide an overview of theories and concepts developed to describe the kinetics, thermodynamics and mechanisms of transport and reaction of moisture and oxygen within bitumen and discuss the possibilities of establishing coupled moisture-oxygen models to be used for long-term pavement performance prediction.
References
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Journal ArticleDOI
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TL;DR: This Account summarizes techniques for fabrication and applications in biomedicine of microfluidic devices fabricated in poly(dimethylsiloxane) (PDMS).
PatentDOI
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Microfluidic devices fabricated in Poly(dimethylsiloxane) for biological studies
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Journal ArticleDOI
Three-dimensional nanopillar-array photovoltaics on low-cost and flexible substrates
Zhiyong Fan,Haleh Razavi,Haleh Razavi,Jae Won Do,Jae Won Do,Aimee Moriwaki,Aimee Moriwaki,Onur Ergen,Onur Ergen,Yu-Lun Chueh,Yu-Lun Chueh,Paul W. Leu,Paul W. Leu,Johnny C. Ho,Johnny C. Ho,Toshitake Takahashi,Toshitake Takahashi,Lothar A. Reichertz,Steven L. Neale,Kyoungsik Yu,Ming C. Wu,Joel W. Ager,Ali Javey,Ali Javey +23 more
TL;DR: The direct growth of highly regular, single-crystalline nanopillar arrays of optically active semiconductors on aluminium substrates that are then configured as solar-cell modules for enabling highly versatile solar modules on both rigid and flexible substrates with enhanced carrier collection efficiency arising from the geometric configuration of the nanopillars.
Journal ArticleDOI
Characterization of continuously distributed cortical water diffusion rates with a stretched-exponential model
Kevin M. Bennett,Kathleen M. Schmainda,Raoqiong Bennett,Daniel B. Rowe,Hanbing Lu,James S. Hyde +5 more
TL;DR: Experience with diffusion‐weighted imaging (DWI) shows that signal attenuation is consistent with a multicompartmental theory of water diffusion in the brain, and the use of a distributed diffusion coefficient (DDC) is suggested to measure mean intravoxel diffusion rates in the presence of such heterogeneity.
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