Single-File Diffusion Observation

Hahn, K.; Kärger, Jörg; Kukla, Volker

doi:10.1103/physrevlett.76.2762

Cited by 419 publications

(384 citation statements)

References 16 publications

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“…Although single-file diffusion was known theoretically for many years, it was much later confirmed experimentally in zeolites. [384][385][386][387] To investigate single-file diffusion experimentally, one has to use a zeolite with one-dimensional channels that are sufficiently narrow such that the probability that two molecules can pass each other is very small. In addition, the zeolite channels have a finite length, and if molecules leave or enter the zeolite, the correlation that is responsible for single-file diffusion is destroyed.…”

Section: Single-file Diffusionmentioning

confidence: 99%

Molecular Simulations of Zeolites: Adsorption, Diffusion, and Shape Selectivity

2008

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Section: Single-file Diffusionmentioning

confidence: 99%

Molecular Simulations of Zeolites: Adsorption, Diffusion, and Shape Selectivity

2008

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“…Fly ash , clay , zeolite ) and peat moss (Brown et al, 2001) have also been commonly used as adsorbents because their structure provides sufficient surface area for adsorption. In all cases, however, the presence of an ill-defined pore structure (Hahn et al, 1996;Yoshitake et al, 2002) has a hindering effect on diffusion, which may lead to a decrease in the adsorption rate and the available capacity (Hu et al, 2006). Ideally, the pores of an adsorbent should facilitate the transport of molecules and provide free access.…”

Section: Introductionmentioning

confidence: 99%

Thiol-functionalised mesoporous silica-coated magnetite nanoparticles for high efficiency removal and recovery of Hg from water

2012

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The preparation and testing of thiol-functionalised silica-coated magnetite nanoparticles (TF-SCMNPs) is described. The characteristics of these particles are assessed at different stages in the production process using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), and a magnetometer. The particles were found to be almost spherical with a uniform mesoporous structure with a pore size of ~2.1 nm. The particles were strongly responsive to an external magnetic field making separation from solution possible in less than 1 min. The adsorption characteristics of the particles were quantified in a series of isotherm experiments using Hg(II) solution concentrations between 40 and 1000 μg l -1 at adsorbent concentrations of 4 and 8 mg l -1 . The adsorption capacity was higher than for other commonly used adsorbents with 90% of Hg(II) removed during the first 5 min and equilibrium in less than 15 min. Both the Langmuir and Freundlich isotherm models were applied to the isotherm data and the maximum adsorption capacity was achieved when the ratio of adsorbent to adsorbate was low. temperature and pH had an effect on adsorption but when the TF-SCMNPs were used for removal of Hg(II) from tap water and bottled water, which contained other ions, there appeared to be no interference. Hg(II) could be successfully desorbed using thiourea in a 3M HCl solution; this did not result in the destruction of the nanoparticles and they could subsequently be reused without loss of their activity in repetitive adsorption tests.

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“…On the other hand, it is nowadays widely recognized that anomalous transport is a documented effect rather than an accident due to the oversimplification of theoretical models. Typical examples are single-filing systems, where particle diffusion does not follow Fick's law [6], and the enhancement of vibrational energy transmission in quasi-1D systems, such as polymers [7] or individual carbon nanotubes [8].…”

Section: Introductionmentioning

confidence: 99%

Anomalous kinetics and transport from 1D self-consistent mode-coupling theory

et al. 2007

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Abstract. We study the dynamics of long-wavelength fluctuations in onedimensional (1D) many-particle systems as described by self-consistent modecoupling theory. The corresponding nonlinear integro-differential equations for the relevant correlators are solved analytically and checked numerically. In particular, we find that the memory functions exhibit a power-law decay accompanied by relatively fast oscillations. Furthermore, the scaling behaviour and, correspondingly, the universality class depends on the order of the leading nonlinear term. In the cubic case, both viscosity and thermal conductivity diverge in the thermodynamic limit. In the quartic case, a faster decay of the memory functions leads to a finite viscosity, while thermal conductivity exhibits an even faster divergence. Finally, our analysis puts on a more firm basis the previously conjectured connection between anomalous heat conductivity and anomalous diffusion.

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Single-File Diffusion Observation

Cited by 419 publications

References 16 publications

Molecular Simulations of Zeolites: Adsorption, Diffusion, and Shape Selectivity

Molecular Simulations of Zeolites: Adsorption, Diffusion, and Shape Selectivity

Thiol-functionalised mesoporous silica-coated magnetite nanoparticles for high efficiency removal and recovery of Hg from water

Anomalous kinetics and transport from 1D self-consistent mode-coupling theory

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