Molecular dynamics and glass-transition of ethylene glycol adsorbed in zeolites: Influence of surface–molecule interactions, topology, and loading degree

Erdem, Özlen F.; Tsuwi, Julius; Hong, Suk Bong; Michel, D.

doi:10.1016/j.micromeso.2006.03.036

Cited by 5 publications

(4 citation statements)

References 27 publications

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“…It is important to note that the relaxation strength in the latter relaxation process is proportional to the number of adsorbed molecules. 34 This proportionality seems to be a good evidence that this process is indeed related to the molecular motion of the adsorbed EG molecules.…”

Section: Broadband Dielectric Spectroscopy Analysismentioning

confidence: 78%

“…Further aspects about the conductivity contribution and the MWS polarisation contribution peak are discussed in our previous work. 34 The molecular process is indicated by a circle in Figure 6. It is important to note that the relaxation strength in the latter relaxation process is proportional to the number of adsorbed molecules.…”

Section: Broadband Dielectric Spectroscopy Analysismentioning

confidence: 99%

See 1 more Smart Citation

Slow Motion of Confined Molecules: NMR and Broadband Dielectric Spectroscopy Investigations

Erdem

Pampel

Michel³

2008

j nanosci nanotechnol

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Nuclear magnetic resonance (NMR) and broadband dielectric spectroscopy are used to investigate the dynamics of small glass-forming molecules confined to restricted geometries. Ethylene glycol molecules are embedded in the supercages of NaX zeolites. The combined application of NMR and broadband dielectric spectroscopy advances the understanding of the slowing down of the motion near the glass transition temperature of these confined molecules. In combination with nuclear spin relaxation and nuclear magnetic resonance spectroscopy, dielectric relaxation studies on glass forming molecules allow conclusions on the character of the motion. High resolution 1H magic angle spinning (MAS) NMR measurements not only enable a characterisation of the state of the adsorbed molecules via a chemical shift analysis. By means of an analysis of MAS spinning sidebands we may also estimate a correlation time the meaning of which will be discussed in comparison to the results of longitudinal proton spin relaxation measurements. In addition to broadband dielectric spectroscopy slow molecular motions of partially deuterated ethylene glycol adsorbed in NaX are studied by means of 2H NMR line-shape analysis.

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Section: Broadband Dielectric Spectroscopy Analysismentioning

confidence: 78%

Section: Broadband Dielectric Spectroscopy Analysismentioning

confidence: 99%

Slow Motion of Confined Molecules: NMR and Broadband Dielectric Spectroscopy Investigations

Erdem

Pampel

Michel³

2008

j nanosci nanotechnol

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“…Adsorption of glycol on zeolites has been studied before: Erdem et al (2006Erdem et al ( ) (2005 and Sharma et al (2010) analysed the adsorption of glycol on zeolites NaX and H-ZSM5 experimentally to understand and model the molecular interaction between glycol and zeolite. Their experiments show that glycol can be adsorbed by zeolites.…”

Section: Working Fluid Mixture Water-glycolmentioning

confidence: 99%

Refrigeration below zero °C: Adsorption chillers using water with ethylene glycol as antifreeze

Seiler

Hackmann

Lanzerath

et al. 2017

International Journal of Refrigeration

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“…Much work is reported in the literature regarding the adsorption behavior of water on zeolite, as well as on the behavior of glycols on and in zeolites . However, little attention has been given to how glycols will affect the adsorption behavior of water or water droplets on zeolite surfaces.…”

Section: Introductionmentioning

confidence: 99%

Effects of glycol on adsorption dynamics of idealized water droplets on LTA‐3A zeolite surfaces

Olsen

Kvamme

2019

AIChE Journal

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During production of natural gas, glycol may follow the gas stream due to hydrate prevention or glycol dehumidification. Further dehumidification can be achieved by Linde Type A‐3A zeolite. Local glycol concentrations can form through adsorption to surrounding clay material or zeolite, thus blocking zeolite windows or contaminating condensed water droplets close to the surface. Idealized nanoscale water droplets and their adsorption dynamics onto zeolite structures were simulated, with and without glycol contamination. Blockage of the zeolite windows was also investigated. Water from contaminated droplets adsorbed slower than uncontaminated droplets due to hindrance caused by glycols adsorbed to the zeolite surfaces, thus decreasing initial water loading rates. The adsorption free energy barrier of water was higher for D4R‐terminated zeolite than for alpha cavity‐terminated zeolite. Adsorbed glycols blocked zeolite cavities. However, temperature increase resulted in partial desorption of the glycols, while water desorbed at a lower temperature than for glycol.

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Molecular dynamics and glass-transition of ethylene glycol adsorbed in zeolites: Influence of surface–molecule interactions, topology, and loading degree

Cited by 5 publications

References 27 publications

Slow Motion of Confined Molecules: NMR and Broadband Dielectric Spectroscopy Investigations

Slow Motion of Confined Molecules: NMR and Broadband Dielectric Spectroscopy Investigations

Refrigeration below zero °C: Adsorption chillers using water with ethylene glycol as antifreeze

Effects of glycol on adsorption dynamics of idealized water droplets on LTA‐3A zeolite surfaces

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