Special Issue "Ordered Mesoporous Nanomaterials"

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A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (15 June 2014)

Special Issue Editors

Guest Editor
Prof. Dr. Jordi Sort (Website)

Institució Catalana de Recerca i Estudis Avançats (ICREA) and Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain
Phone: +34 93 581 2085
Fax: +34 93 581 2155
Interests: porous and continuous films; lithographed systems; amorphous alloys; nanocomposites; nanomagnetism; nanomechanics
Guest Editor
Dr. Eva Pellicer (Website)

Ramon y Cajal Researcher, Gnm3 group, Physics Department, Cc (C3/210) building, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain
Interests: electrodeposition; metallic micro- and nanostructures; ordered mesoporous metal oxides; nanocasting; magnetic properties; electrocatalytic properties

Special Issue Information

Dear Colleagues,

Interest in mesoporous materials is fostered by their widespread technological application in diverse areas, such as heterogeneous catalysis, gas sensors, solid electrolytes for rechargeable batteries, supercapacitors or optoelectronic and magnetic devices, amongst others. With a pore size of 2–50 nm, tunable pore topologies and extremely large surface areas, mesoporous materials hold a privileged position between zeolites and macroporous materials. Ordered mesoporous powders can be synthesized using two different approaches: soft-templating and hard-templating methods, whereas ordered mesoporous thin films are typically synthesized by the evaporation induced self-assembly (EISA) method.

This Special Issue is aimed at providing selected contributions on advances in the synthesis, characterization and application of non-siliceous, inorganic, ordered mesoporous materials in both powder and thin film forms. The range of materials includes metal oxides, metals, semiconductors, carbons, and nitrides. Special emphasis is laid on their potential uses in energy storage and conversion and magnetism.

Prof. Dr. Jordi Sort
Dr. Eva Pellicer
Guest Editors

Submission

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. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as 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 refereed through a peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed Open Access monthly 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 1000 CHF (Swiss Francs). English correction and/or formatting fees of 250 CHF (Swiss Francs) will be charged in certain cases for those articles accepted for publication that require extensive additional formatting and/or English corrections.


Keywords

  • ordered mesoporous inorganic materials
  • mesoporous powders
  • mesoporous films
  • templating, evaporation induced self assembly, magnetic properties, electrocatalysis
  • solar cells, fuel cells, batteries

Published Papers (9 papers)

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Editorial

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Open AccessEditorial Ordered Mesoporous Nanomaterials
Nanomaterials 2014, 4(4), 902-904; doi:10.3390/nano4040902
Received: 25 November 2014 / Accepted: 25 November 2014 / Published: 3 December 2014
PDF Full-text (101 KB) | HTML Full-text | XML Full-text
Abstract
The Special Issue of Nanomaterials “Ordered Mesoporous Nanomaterials” covers novel synthetic aspects of mesoporous materials and explores their use in diverse areas like drug delivery, photocatalysis, filtration or electrocatalysis. The range of materials tackled includes metals and alloys, aluminosilicates, silica, alumina and [...] Read more.
The Special Issue of Nanomaterials “Ordered Mesoporous Nanomaterials” covers novel synthetic aspects of mesoporous materials and explores their use in diverse areas like drug delivery, photocatalysis, filtration or electrocatalysis. The range of materials tackled includes metals and alloys, aluminosilicates, silica, alumina and transition metal oxides. The variety of materials, synthetic approaches and applications examined is vivid proof of the interest that mesoporous materials spark among researchers world-wide.[...] Full article
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)

Research

Jump to: Editorial

Open AccessArticle Impact of the De-Alloying Kinetics and Alloy Microstructure on the Final Morphology of De-Alloyed Meso-Porous Metal Films
Nanomaterials 2014, 4(4), 856-878; doi:10.3390/nano4040856
Received: 23 July 2014 / Revised: 1 October 2014 / Accepted: 8 October 2014 / Published: 17 October 2014
Cited by 5 | PDF Full-text (4550 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Nano-textured porous metal materials present unique surface properties due to their enhanced surface energy with potential applications in sensing, molecular separation and catalysis. In this paper, commercial alloy foils, including brass (Cu85Zn15 and Cu70Zn30) and [...] Read more.
Nano-textured porous metal materials present unique surface properties due to their enhanced surface energy with potential applications in sensing, molecular separation and catalysis. In this paper, commercial alloy foils, including brass (Cu85Zn15 and Cu70Zn30) and white gold (Au50Ag50) foils have been chemically de-alloyed to form nano-porous thin films. The impact of the initial alloy micro-structure and number of phases, as well as chemical de-alloying (DA) parameters, including etchant concentration, time and solution temperature on the final nano-porous thin film morphology and properties were investigated by electron microscopy (EM). Furthermore, the penetration depth of the pores across the alloys were evaluated through the preparation of cross sections by focus ion beam (FIB) milling. It is demonstrated that ordered pores ranging between 100 nm and 600 nm in diameter and 2–5 μm in depth can be successfully formed for the range of materials tested. The microstructure of the foils were obtained by electron back-scattered diffraction (EBSD) and linked to development of pits across the material thickness and surface during DA. The role of selective etching of both noble and sacrificial metal phases of the alloy were discussed in light of the competitive surface etching across the range of microstructures and materials tested. Full article
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)
Open AccessArticle Encapsulation of Anti-Tuberculosis Drugs within Mesoporous Silica and Intracellular Antibacterial Activities
Nanomaterials 2014, 4(3), 813-826; doi:10.3390/nano4030813
Received: 20 May 2014 / Revised: 18 August 2014 / Accepted: 25 August 2014 / Published: 11 September 2014
Cited by 3 | PDF Full-text (879 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Tuberculosis is a major problem in public health. While new effective treatments to combat the disease are currently under development, they tend suffer from poor solubility often resulting in low and/or inconsistent oral bioavailability. Mesoporous materials are here investigated in an in [...] Read more.
Tuberculosis is a major problem in public health. While new effective treatments to combat the disease are currently under development, they tend suffer from poor solubility often resulting in low and/or inconsistent oral bioavailability. Mesoporous materials are here investigated in an in vitro intracellular assay, for the effective delivery of compound PA-824; a poorly soluble bactericidal agent being developed against Tuberculosis (TB). Mesoporous materials enhance the solubility of PA-824; however, this is not translated into a higher antibacterial activity in TB-infected macrophages after 5 days of incubation, where similar values are obtained. The lack of improved activity may be due to insufficient release of the drug from the mesopores in the context of the cellular environment. However, these results show promising data for the use of mesoporous particles in the context of oral delivery with expected improvements in bioavailability. Full article
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)
Open AccessArticle High-Temperature Synthesis of Ordered Mesoporous Aluminosilicates from ZSM-5 Nanoseeds with Improved Acidic Properties
Nanomaterials 2014, 4(3), 712-725; doi:10.3390/nano4030712
Received: 6 June 2014 / Revised: 4 August 2014 / Accepted: 5 August 2014 / Published: 18 August 2014
Cited by 3 | PDF Full-text (1735 KB) | HTML Full-text | XML Full-text
Abstract
Ordered mesoporous SBA-15 analogs with different Si/Al ratios were successfully prepared in a two-step process from self-assembly of ZSM-5 nanoseeds at high temperature in mildly acidic media (473 K, pH 3.5). The obtained products were characterized as SAXS, XRD, N2 sorption, [...] Read more.
Ordered mesoporous SBA-15 analogs with different Si/Al ratios were successfully prepared in a two-step process from self-assembly of ZSM-5 nanoseeds at high temperature in mildly acidic media (473 K, pH 3.5). The obtained products were characterized as SAXS, XRD, N2 sorption, FTIR, TEM, NH3-TPD, AAS and ICP. The results show that the initial Si/Al molar ratio of ZSM-5 precursors strongly affects the final materials’ properties. A highly condensed, well-ordered mesoporous SBA-15 analog with improved hydrothermal stability and acidic properties can be prepared from low aluminum containing ZSM-5 precursors (Si/Al ≥ 20). Reducing the initial Si/Al molar ratio to 10, however, leads to the formation of a disordered mesoporous SBA-15 type material accompanied by degraded textural and acidic properties. The gas phase cracking of cumene, carried out as probe reaction to evaluate Brønsted acidity, reveals that an increased density of Brønsted acid sites has been achieved over the SBA-15 analogs compared to conventional Al-SBA-15 due to the preservation of zeolite building units in the mesopore walls of the SBA-15 analogs. Full article
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)
Figures

Open AccessArticle Effect of Porosity and Concentration Polarization on Electrolyte Diffusive Transport Parameters through Ceramic Membranes with Similar Nanopore Size
Nanomaterials 2014, 4(3), 700-711; doi:10.3390/nano4030700
Received: 25 June 2014 / Revised: 21 July 2014 / Accepted: 22 July 2014 / Published: 6 August 2014
Cited by 2 | PDF Full-text (731 KB) | HTML Full-text | XML Full-text
Abstract
Diffusive transport through nanoporous alumina membranes (NPAMs) produced by the two-step anodization method, with similar pore size but different porosity, is studied by analyzing membrane potential measured with NaCl solutions at different concentrations. Donnan exclusion of co-ions at the solution/membrane interface seem [...] Read more.
Diffusive transport through nanoporous alumina membranes (NPAMs) produced by the two-step anodization method, with similar pore size but different porosity, is studied by analyzing membrane potential measured with NaCl solutions at different concentrations. Donnan exclusion of co-ions at the solution/membrane interface seem to exert a certain control on the diffusive transport of ions through NPAMs with low porosity, which might be reduced by coating the membrane surface with appropriated materials, as it is the case of SiO2. Our results also show the effect of concentration polarization at the membrane surface on ionic transport numbers (or diffusion coefficients) for low-porosity and high electrolyte affinity membranes, which could mask values of those characteristic electrochemical parameters. Full article
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)
Open AccessArticle Fabrication of Meso-Porous Sintered Metal Thin Films by Selective Etching of Silica Based Sacrificial Template
Nanomaterials 2014, 4(3), 686-699; doi:10.3390/nano4030686
Received: 15 June 2014 / Revised: 25 July 2014 / Accepted: 25 July 2014 / Published: 4 August 2014
Cited by 3 | PDF Full-text (2809 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Meso-porous metal materials have enhanced surface energies offering unique surface properties with potential applications in chemical catalysis, molecular sensing and selective separation. In this paper, commercial 20 nm diameter metal nano-particles, including silver and copper were blended with 7 nm silica nano-particles [...] Read more.
Meso-porous metal materials have enhanced surface energies offering unique surface properties with potential applications in chemical catalysis, molecular sensing and selective separation. In this paper, commercial 20 nm diameter metal nano-particles, including silver and copper were blended with 7 nm silica nano-particles by shear mixing. The resulted powders were cold-sintered to form dense, hybrid thin films. The sacrificial silica template was then removed by selective etching in 12 wt% hydrofluoric acid solutions for 15 min to reveal a purely metallic meso-porous thin film material. The impact of the initial silica nano-particle diameter (7–20 nm) as well as the sintering pressure (5–20 ton·m−2) and etching conditions on the morphology and properties of the final nano-porous thin films were investigated by porometry, pyknometery, gas and liquid permeation and electron microscopy. Furthermore, the morphology of the pores and particle aggregation during shear mixing were assessed through cross-sectioning by focus ion beam milling. It is demonstrated that meso-pores ranging between 50 and 320 nm in average diameter and porosities up to 47% can be successfully formed for the range of materials tested. Full article
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)
Open AccessArticle Mesoporous Titania Powders: The Role of Precursors, Ligand Addition and Calcination Rate on Their Morphology, Crystalline Structure and Photocatalytic Activity
Nanomaterials 2014, 4(3), 583-598; doi:10.3390/nano4030583
Received: 15 June 2014 / Revised: 11 July 2014 / Accepted: 14 July 2014 / Published: 30 July 2014
Cited by 5 | PDF Full-text (3331 KB) | HTML Full-text | XML Full-text
Abstract
We evaluate the influence of the use of different titania precursors, calcination rate, and ligand addition on the morphology, texture and phase content of synthesized mesoporous titania samples, parameters which, in turn, can play a key role in titania photocatalytic performances. The [...] Read more.
We evaluate the influence of the use of different titania precursors, calcination rate, and ligand addition on the morphology, texture and phase content of synthesized mesoporous titania samples, parameters which, in turn, can play a key role in titania photocatalytic performances. The powders, obtained through the evaporation-induced self-assembly method, are characterized by means of ex situ X-Ray Powder Diffraction (XRPD) measurements, N2 physisorption isotherms and transmission electron microscopy. The precursors are selected basing on two different approaches: the acid-base pair, using TiCl4 and Ti(OBu)4, and a more classic route with Ti(OiPr)4 and HCl. For both precursors, different specimens were prepared by resorting to different calcination rates and with and without the addition of acetylacetone, that creates coordinated species with lower hydrolysis rates, and with different calcination rates. Each sample was employed as photoanode and tested in the water splitting reaction by recording I-V curves and comparing the results with commercial P25 powders. The complex data framework suggests that a narrow pore size distribution, due to the use of acetylacetone, plays a major role in the photoactivity, leading to a current density value higher than that of P25. Full article
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)
Open AccessArticle Electrochemical Synthesis of Mesoporous CoPt Nanowires for Methanol Oxidation
Nanomaterials 2014, 4(2), 189-202; doi:10.3390/nano4020189
Received: 11 March 2014 / Revised: 22 March 2014 / Accepted: 23 March 2014 / Published: 28 March 2014
Cited by 3 | PDF Full-text (2470 KB) | HTML Full-text | XML Full-text
Abstract
A new electrochemical method to synthesize mesoporous nanowires of alloys has been developed. Electrochemical deposition in ionic liquid-in-water (IL/W) microemulsion has been successful to grow mesoporous CoPt nanowires in the interior of polycarbonate membranes. The viscosity of the medium was high, but [...] Read more.
A new electrochemical method to synthesize mesoporous nanowires of alloys has been developed. Electrochemical deposition in ionic liquid-in-water (IL/W) microemulsion has been successful to grow mesoporous CoPt nanowires in the interior of polycarbonate membranes. The viscosity of the medium was high, but it did not avoid the entrance of the microemulsion in the interior of the membrane’s channels. The structure of the IL/W microemulsions, with droplets of ionic liquid (4 nm average diameter) dispersed in CoPt aqueous solution, defined the structure of the nanowires, with pores of a few nanometers, because CoPt alloy deposited only from the aqueous component of the microemulsion. The electrodeposition in IL/W microemulsion allows obtaining mesoporous structures in which the small pores must correspond to the size of the droplets of the electrolytic aqueous component of the microemulsion. The IL main phase is like a template for the confined electrodeposition. The comparison of the electrocatalytic behaviours towards methanol oxidation of mesoporous and compact CoPt nanowires of the same composition, demonstrated the porosity of the material. For the same material mass, the CoPt mesoporous nanowires present a surface area 16 times greater than compact ones, and comparable to that observed for commercial carbon-supported platinum nanoparticles. Full article
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)
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Open AccessArticle Percolation Diffusion into Self-Assembled Mesoporous Silica Microfibres
Nanomaterials 2014, 4(1), 157-174; doi:10.3390/nano4010157
Received: 21 January 2014 / Revised: 28 February 2014 / Accepted: 1 March 2014 / Published: 10 March 2014
Cited by 6 | PDF Full-text (1011 KB) | HTML Full-text | XML Full-text
Abstract
Percolation diffusion into long (11.5 cm) self-assembled, ordered mesoporous microfibres is studied using optical transmission and laser ablation inductive coupled mass spectrometry (LA-ICP-MS). Optical transmission based diffusion studies reveal rapid penetration (<5 s, D > 80 μm2∙s1) [...] Read more.
Percolation diffusion into long (11.5 cm) self-assembled, ordered mesoporous microfibres is studied using optical transmission and laser ablation inductive coupled mass spectrometry (LA-ICP-MS). Optical transmission based diffusion studies reveal rapid penetration (<5 s, D > 80 μm2∙s1) of Rhodamine B with very little percolation of larger molecules such as zinc tetraphenylporphyrin (ZnTPP) observed under similar loading conditions. The failure of ZnTPP to enter the microfibre was confirmed, in higher resolution, using LA-ICP-MS. In the latter case, LA-ICP-MS was used to determine the diffusion of zinc acetate dihydrate, D~3 × 10−4 nm2∙s−1. The large differences between the molecules are accounted for by proposing ordered solvent and structure assisted accelerated diffusion of the Rhodamine B based on its hydrophilicity relative to the zinc compounds. The broader implications and applications for filtration, molecular sieves and a range of devices and uses are described. Full article
(This article belongs to the Special Issue Ordered Mesoporous Nanomaterials)

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.


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