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Diffusion under Confinement in Nanopores
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Diffusion under Confinement in Nanopores

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Porous Materials".

Deadline for manuscript submissions: closed (30 April 2015) | Viewed by 13681

Special Issue Editors

Dr. Sergey Vasenkov

E-Mail Website
Guest Editor
Department of Chemical Engineering, University of Florida, 423 ChE Bldg., PO Box 116005, Gainesville, FL 32611, USA
Interests: transport in porous materials with hierarchy of pore sizes; dynamics in room temperature ionic liquids; single-file diffusion in nanochannels; separations of greenhouse gases
Special Issues, Collections and Topics in MDPI journals
Dr. Christian Chmelik

E-Mail Website
Guest Editor
Department of Interface Physics, University of Leipzig, Linnéstr. 5, 04103 Leipzig, Germany
Interests: micro-imaging of diffusion in nanoporous materials; host-guest interactions; mixture diffusion; reaction-diffusion patterns
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Recent development and improvement of the experimental techniques capable of monitoring transport of quest molecules in microporous and mesoporous materials in a broad range of length scales, guest concentrations and temperatures leads to a new level of understanding of the influence of confinement in pores on diffusion. Combining this new knowledge from experimental studies with molecular-level and multiscale computer simulations of transport phenomena has a potential for the development of the knowledge-based strategies of the design of porous solids, which are optimized for specific applications. Such applications include catalysis, separations, molecular storage and sensor development. In many cases, the materials of interest for these applications exhibit a broad distribution or even a hierarchy of pore sizes. Functionalization of pore walls with various types of active groups adds to the complexity of pore structures. Such complexity of pore structures leads to a complexity of intrapore diffusion. In addition to normal, i.e. Fickian diffusion the confinement in nanopores can also result in anomalous diffusion, such as single-file diffusion in nanochannels. This Special Issue focuses on all aspects of molecular transport in microporous and mesoporous materials including porous membranes, catalysts and sensors.

Dr. Sergey Vasenkov
Dr. Christian Chmelik
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


Keywords

  • microporous
  • mesoporous
  • hierarchical materials
  • hybrid materials
  • molecular diffusion
  • permeation

Published Papers (2 papers)

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Research

2906 KiB  
Article
Sustained Administration of Hormones Exploiting Nanoconfined Diffusion through Nanochannel Membranes
by Thomas Geninatti, R. Lyle Hood, Giacomo Bruno, Priya Jain, Eugenia Nicolov, Arturas Ziemys and Alessandro Grattoni
Materials 2015, 8(8), 5276-5288; https://doi.org/10.3390/ma8085241 - 13 Aug 2015
Cited by 11 | Viewed by 5490
Abstract
Implantable devices may provide a superior means for hormone delivery through maintaining serum levels within target therapeutic windows. Zero-order administration has been shown to reach an equilibrium with metabolic clearance, resulting in a constant serum concentration and bioavailability of released hormones. By exploiting [...] Read more.
Implantable devices may provide a superior means for hormone delivery through maintaining serum levels within target therapeutic windows. Zero-order administration has been shown to reach an equilibrium with metabolic clearance, resulting in a constant serum concentration and bioavailability of released hormones. By exploiting surface-to-molecule interaction within nanochannel membranes, it is possible to achieve a long-term, constant diffusive release of agents from implantable reservoirs. In this study, we sought to demonstrate the controlled release of model hormones from a novel nanochannel system. We investigated the delivery of hormones through our nanochannel membrane over a period of 40 days. Levothyroxine, osteocalcin and testosterone were selected as representative hormones based on their different molecular properties and structures. The release mechanisms and transport behaviors of these hormones within 3, 5 and 40 nm channels were characterized. Results further supported the suitability of the nanochannels for sustained administration from implantable platforms. Full article
(This article belongs to the Special Issue Diffusion under Confinement in Nanopores)
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832 KiB  
Article
Liquid- and Gas-Phase Diffusion of Ferrocene in Thin Films of Metal-Organic Frameworks
by Wencai Zhou, Christof Wöll and Lars Heinke
Materials 2015, 8(6), 3767-3775; https://doi.org/10.3390/ma8063767 - 19 Jun 2015
Cited by 33 | Viewed by 7811
Abstract
The mass transfer of the guest molecules in nanoporous host materials, in particular in metal-organic frameworks (MOFs), is among the crucial features of their applications. By using thin surface-mounted MOF films in combination with a quartz crystal microbalance (QCM), the diffusion of ferrocene [...] Read more.
The mass transfer of the guest molecules in nanoporous host materials, in particular in metal-organic frameworks (MOFs), is among the crucial features of their applications. By using thin surface-mounted MOF films in combination with a quartz crystal microbalance (QCM), the diffusion of ferrocene vapor and of ethanolic and hexanic ferrocene solution in HKUST-1 was investigated. For the first time, liquid- and gas-phase diffusion in MOFs was compared directly in the identical sample. The diffusion coefficients are in the same order of magnitude (~10−16 m2·s−1), whereas the diffusion coefficient of ferrocene in the empty framework is roughly 3-times smaller than in the MOF which is filled with ethanol or n-hexane. Full article
(This article belongs to the Special Issue Diffusion under Confinement in Nanopores)
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